simplewebrtc-with-adapter.bundle.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.adapter = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 /* eslint-env node */
'use strict';

// SDP helpers.
var SDPUtils = {};

// Generate an alphanumeric identifier for cname or mids.
// TODO: use UUIDs instead? https://gist.github.com/jed/982883
SDPUtils.generateIdentifier = function() {
  return Math.random().toString(36).substr(2, 10);
};

// The RTCP CNAME used by all peerconnections from the same JS.
SDPUtils.localCName = SDPUtils.generateIdentifier();

// Splits SDP into lines, dealing with both CRLF and LF.
SDPUtils.splitLines = function(blob) {
  return blob.trim().split('\n').map(function(line) {
    return line.trim();
  });
};
// Splits SDP into sessionpart and mediasections. Ensures CRLF.
SDPUtils.splitSections = function(blob) {
  var parts = blob.split('\nm=');
  return parts.map(function(part, index) {
    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
  });
};

// Returns lines that start with a certain prefix.
SDPUtils.matchPrefix = function(blob, prefix) {
  return SDPUtils.splitLines(blob).filter(function(line) {
    return line.indexOf(prefix) === 0;
  });
};

// Parses an ICE candidate line. Sample input:
// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
// rport 55996"
SDPUtils.parseCandidate = function(line) {
  var parts;
  // Parse both variants.
  if (line.indexOf('a=candidate:') === 0) {
    parts = line.substring(12).split(' ');
  } else {
    parts = line.substring(10).split(' ');
  }

  var candidate = {
    foundation: parts[0],
    component: parseInt(parts[1], 10),
    protocol: parts[2].toLowerCase(),
    priority: parseInt(parts[3], 10),
    ip: parts[4],
    port: parseInt(parts[5], 10),
    // skip parts[6] == 'typ'
    type: parts[7]
  };

  for (var i = 8; i < parts.length; i += 2) {
    switch (parts[i]) {
      case 'raddr':
        candidate.relatedAddress = parts[i + 1];
        break;
      case 'rport':
        candidate.relatedPort = parseInt(parts[i + 1], 10);
        break;
      case 'tcptype':
        candidate.tcpType = parts[i + 1];
        break;
      default: // extension handling, in particular ufrag
        candidate[parts[i]] = parts[i + 1];
        break;
    }
  }
  return candidate;
};

// Translates a candidate object into SDP candidate attribute.
SDPUtils.writeCandidate = function(candidate) {
  var sdp = [];
  sdp.push(candidate.foundation);
  sdp.push(candidate.component);
  sdp.push(candidate.protocol.toUpperCase());
  sdp.push(candidate.priority);
  sdp.push(candidate.ip);
  sdp.push(candidate.port);

  var type = candidate.type;
  sdp.push('typ');
  sdp.push(type);
  if (type !== 'host' && candidate.relatedAddress &&
      candidate.relatedPort) {
    sdp.push('raddr');
    sdp.push(candidate.relatedAddress); // was: relAddr
    sdp.push('rport');
    sdp.push(candidate.relatedPort); // was: relPort
  }
  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
    sdp.push('tcptype');
    sdp.push(candidate.tcpType);
  }
  return 'candidate:' + sdp.join(' ');
};

// Parses an ice-options line, returns an array of option tags.
// a=ice-options:foo bar
SDPUtils.parseIceOptions = function(line) {
  return line.substr(14).split(' ');
}

// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
// a=rtpmap:111 opus/48000/2
SDPUtils.parseRtpMap = function(line) {
  var parts = line.substr(9).split(' ');
  var parsed = {
    payloadType: parseInt(parts.shift(), 10) // was: id
  };

  parts = parts[0].split('/');

  parsed.name = parts[0];
  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
  // was: channels
  parsed.numChannels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
  return parsed;
};

// Generate an a=rtpmap line from RTCRtpCodecCapability or
// RTCRtpCodecParameters.
SDPUtils.writeRtpMap = function(codec) {
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
      (codec.numChannels !== 1 ? '/' + codec.numChannels : '') + '\r\n';
};

// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
SDPUtils.parseExtmap = function(line) {
  var parts = line.substr(9).split(' ');
  return {
    id: parseInt(parts[0], 10),
    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
    uri: parts[1]
  };
};

// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
// RTCRtpHeaderExtension.
SDPUtils.writeExtmap = function(headerExtension) {
  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
      (headerExtension.direction && headerExtension.direction !== 'sendrecv'
          ? '/' + headerExtension.direction
          : '') +
      ' ' + headerExtension.uri + '\r\n';
};

// Parses an ftmp line, returns dictionary. Sample input:
// a=fmtp:96 vbr=on;cng=on
// Also deals with vbr=on; cng=on
SDPUtils.parseFmtp = function(line) {
  var parsed = {};
  var kv;
  var parts = line.substr(line.indexOf(' ') + 1).split(';');
  for (var j = 0; j < parts.length; j++) {
    kv = parts[j].trim().split('=');
    parsed[kv[0].trim()] = kv[1];
  }
  return parsed;
};

// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
SDPUtils.writeFmtp = function(codec) {
  var line = '';
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  if (codec.parameters && Object.keys(codec.parameters).length) {
    var params = [];
    Object.keys(codec.parameters).forEach(function(param) {
      params.push(param + '=' + codec.parameters[param]);
    });
    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
  }
  return line;
};

// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
// a=rtcp-fb:98 nack rpsi
SDPUtils.parseRtcpFb = function(line) {
  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
  return {
    type: parts.shift(),
    parameter: parts.join(' ')
  };
};
// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
SDPUtils.writeRtcpFb = function(codec) {
  var lines = '';
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
    // FIXME: special handling for trr-int?
    codec.rtcpFeedback.forEach(function(fb) {
      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
          '\r\n';
    });
  }
  return lines;
};

// Parses an RFC 5576 ssrc media attribute. Sample input:
// a=ssrc:3735928559 cname:something
SDPUtils.parseSsrcMedia = function(line) {
  var sp = line.indexOf(' ');
  var parts = {
    ssrc: parseInt(line.substr(7, sp - 7), 10)
  };
  var colon = line.indexOf(':', sp);
  if (colon > -1) {
    parts.attribute = line.substr(sp + 1, colon - sp - 1);
    parts.value = line.substr(colon + 1);
  } else {
    parts.attribute = line.substr(sp + 1);
  }
  return parts;
};

// Extracts the MID (RFC 5888) from a media section.
// returns the MID or undefined if no mid line was found.
SDPUtils.getMid = function(mediaSection) {
  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
  if (mid) {
    return mid.substr(6);
  }
}

SDPUtils.parseFingerprint = function(line) {
  var parts = line.substr(14).split(' ');
  return {
    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
    value: parts[1]
  };
};

// Extracts DTLS parameters from SDP media section or sessionpart.
// FIXME: for consistency with other functions this should only
//   get the fingerprint line as input. See also getIceParameters.
SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
      'a=fingerprint:');
  // Note: a=setup line is ignored since we use the 'auto' role.
  // Note2: 'algorithm' is not case sensitive except in Edge.
  return {
    role: 'auto',
    fingerprints: lines.map(SDPUtils.parseFingerprint)
  };
};

// Serializes DTLS parameters to SDP.
SDPUtils.writeDtlsParameters = function(params, setupType) {
  var sdp = 'a=setup:' + setupType + '\r\n';
  params.fingerprints.forEach(function(fp) {
    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
  });
  return sdp;
};
// Parses ICE information from SDP media section or sessionpart.
// FIXME: for consistency with other functions this should only
//   get the ice-ufrag and ice-pwd lines as input.
SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
  var lines = SDPUtils.splitLines(mediaSection);
  // Search in session part, too.
  lines = lines.concat(SDPUtils.splitLines(sessionpart));
  var iceParameters = {
    usernameFragment: lines.filter(function(line) {
      return line.indexOf('a=ice-ufrag:') === 0;
    })[0].substr(12),
    password: lines.filter(function(line) {
      return line.indexOf('a=ice-pwd:') === 0;
    })[0].substr(10)
  };
  return iceParameters;
};

// Serializes ICE parameters to SDP.
SDPUtils.writeIceParameters = function(params) {
  return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
      'a=ice-pwd:' + params.password + '\r\n';
};

// Parses the SDP media section and returns RTCRtpParameters.
SDPUtils.parseRtpParameters = function(mediaSection) {
  var description = {
    codecs: [],
    headerExtensions: [],
    fecMechanisms: [],
    rtcp: []
  };
  var lines = SDPUtils.splitLines(mediaSection);
  var mline = lines[0].split(' ');
  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
    var pt = mline[i];
    var rtpmapline = SDPUtils.matchPrefix(
        mediaSection, 'a=rtpmap:' + pt + ' ')[0];
    if (rtpmapline) {
      var codec = SDPUtils.parseRtpMap(rtpmapline);
      var fmtps = SDPUtils.matchPrefix(
          mediaSection, 'a=fmtp:' + pt + ' ');
      // Only the first a=fmtp:<pt> is considered.
      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
      codec.rtcpFeedback = SDPUtils.matchPrefix(
          mediaSection, 'a=rtcp-fb:' + pt + ' ')
        .map(SDPUtils.parseRtcpFb);
      description.codecs.push(codec);
      // parse FEC mechanisms from rtpmap lines.
      switch (codec.name.toUpperCase()) {
        case 'RED':
        case 'ULPFEC':
          description.fecMechanisms.push(codec.name.toUpperCase());
          break;
        default: // only RED and ULPFEC are recognized as FEC mechanisms.
          break;
      }
    }
  }
  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
    description.headerExtensions.push(SDPUtils.parseExtmap(line));
  });
  // FIXME: parse rtcp.
  return description;
};

// Generates parts of the SDP media section describing the capabilities /
// parameters.
SDPUtils.writeRtpDescription = function(kind, caps) {
  var sdp = '';

  // Build the mline.
  sdp += 'm=' + kind + ' ';
  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
  sdp += ' UDP/TLS/RTP/SAVPF ';
  sdp += caps.codecs.map(function(codec) {
    if (codec.preferredPayloadType !== undefined) {
      return codec.preferredPayloadType;
    }
    return codec.payloadType;
  }).join(' ') + '\r\n';

  sdp += 'c=IN IP4 0.0.0.0\r\n';
  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';

  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
  caps.codecs.forEach(function(codec) {
    sdp += SDPUtils.writeRtpMap(codec);
    sdp += SDPUtils.writeFmtp(codec);
    sdp += SDPUtils.writeRtcpFb(codec);
  });
  var maxptime = 0;
  caps.codecs.forEach(function(codec) {
    if (codec.maxptime > maxptime) {
      maxptime = codec.maxptime;
    }
  });
  if (maxptime > 0) {
    sdp += 'a=maxptime:' + maxptime + '\r\n';
  }
  sdp += 'a=rtcp-mux\r\n';

  caps.headerExtensions.forEach(function(extension) {
    sdp += SDPUtils.writeExtmap(extension);
  });
  // FIXME: write fecMechanisms.
  return sdp;
};

// Parses the SDP media section and returns an array of
// RTCRtpEncodingParameters.
SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
  var encodingParameters = [];
  var description = SDPUtils.parseRtpParameters(mediaSection);
  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;

  // filter a=ssrc:... cname:, ignore PlanB-msid
  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
  .map(function(line) {
    return SDPUtils.parseSsrcMedia(line);
  })
  .filter(function(parts) {
    return parts.attribute === 'cname';
  });
  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
  var secondarySsrc;

  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
  .map(function(line) {
    var parts = line.split(' ');
    parts.shift();
    return parts.map(function(part) {
      return parseInt(part, 10);
    });
  });
  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
    secondarySsrc = flows[0][1];
  }

  description.codecs.forEach(function(codec) {
    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
      var encParam = {
        ssrc: primarySsrc,
        codecPayloadType: parseInt(codec.parameters.apt, 10),
        rtx: {
          ssrc: secondarySsrc
        }
      };
      encodingParameters.push(encParam);
      if (hasRed) {
        encParam = JSON.parse(JSON.stringify(encParam));
        encParam.fec = {
          ssrc: secondarySsrc,
          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
        };
        encodingParameters.push(encParam);
      }
    }
  });
  if (encodingParameters.length === 0 && primarySsrc) {
    encodingParameters.push({
      ssrc: primarySsrc
    });
  }

  // we support both b=AS and b=TIAS but interpret AS as TIAS.
  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
  if (bandwidth.length) {
    if (bandwidth[0].indexOf('b=TIAS:') === 0) {
      bandwidth = parseInt(bandwidth[0].substr(7), 10);
    } else if (bandwidth[0].indexOf('b=AS:') === 0) {
      bandwidth = parseInt(bandwidth[0].substr(5), 10);
    }
    encodingParameters.forEach(function(params) {
      params.maxBitrate = bandwidth;
    });
  }
  return encodingParameters;
};

// parses http://draft.ortc.org/#rtcrtcpparameters*
SDPUtils.parseRtcpParameters = function(mediaSection) {
  var rtcpParameters = {};

  var cname;
  // Gets the first SSRC. Note that with RTX there might be multiple
  // SSRCs.
  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
      .map(function(line) {
        return SDPUtils.parseSsrcMedia(line);
      })
      .filter(function(obj) {
        return obj.attribute === 'cname';
      })[0];
  if (remoteSsrc) {
    rtcpParameters.cname = remoteSsrc.value;
    rtcpParameters.ssrc = remoteSsrc.ssrc;
  }

  // Edge uses the compound attribute instead of reducedSize
  // compound is !reducedSize
  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
  rtcpParameters.reducedSize = rsize.length > 0;
  rtcpParameters.compound = rsize.length === 0;

  // parses the rtcp-mux attrіbute.
  // Note that Edge does not support unmuxed RTCP.
  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
  rtcpParameters.mux = mux.length > 0;

  return rtcpParameters;
};

// parses either a=msid: or a=ssrc:... msid lines an returns
// the id of the MediaStream and MediaStreamTrack.
SDPUtils.parseMsid = function(mediaSection) {
  var parts;
  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
  if (spec.length === 1) {
    parts = spec[0].substr(7).split(' ');
    return {stream: parts[0], track: parts[1]};
  }
  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
  .map(function(line) {
    return SDPUtils.parseSsrcMedia(line);
  })
  .filter(function(parts) {
    return parts.attribute === 'msid';
  });
  if (planB.length > 0) {
    parts = planB[0].value.split(' ');
    return {stream: parts[0], track: parts[1]};
  }
};

SDPUtils.writeSessionBoilerplate = function() {
  // FIXME: sess-id should be an NTP timestamp.
  return 'v=0\r\n' +
      'o=thisisadapterortc 8169639915646943137 2 IN IP4 127.0.0.1\r\n' +
      's=-\r\n' +
      't=0 0\r\n';
};

SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);

  // Map ICE parameters (ufrag, pwd) to SDP.
  sdp += SDPUtils.writeIceParameters(
      transceiver.iceGatherer.getLocalParameters());

  // Map DTLS parameters to SDP.
  sdp += SDPUtils.writeDtlsParameters(
      transceiver.dtlsTransport.getLocalParameters(),
      type === 'offer' ? 'actpass' : 'active');

  sdp += 'a=mid:' + transceiver.mid + '\r\n';

  if (transceiver.direction) {
    sdp += 'a=' + transceiver.direction + '\r\n';
  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
    sdp += 'a=sendrecv\r\n';
  } else if (transceiver.rtpSender) {
    sdp += 'a=sendonly\r\n';
  } else if (transceiver.rtpReceiver) {
    sdp += 'a=recvonly\r\n';
  } else {
    sdp += 'a=inactive\r\n';
  }

  if (transceiver.rtpSender) {
    // spec.
    var msid = 'msid:' + stream.id + ' ' +
        transceiver.rtpSender.track.id + '\r\n';
    sdp += 'a=' + msid;

    // for Chrome.
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
        ' ' + msid;
    if (transceiver.sendEncodingParameters[0].rtx) {
      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
          ' ' + msid;
      sdp += 'a=ssrc-group:FID ' +
          transceiver.sendEncodingParameters[0].ssrc + ' ' +
          transceiver.sendEncodingParameters[0].rtx.ssrc +
          '\r\n';
    }
  }
  // FIXME: this should be written by writeRtpDescription.
  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
      ' cname:' + SDPUtils.localCName + '\r\n';
  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
        ' cname:' + SDPUtils.localCName + '\r\n';
  }
  return sdp;
};

// Gets the direction from the mediaSection or the sessionpart.
SDPUtils.getDirection = function(mediaSection, sessionpart) {
  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
  var lines = SDPUtils.splitLines(mediaSection);
  for (var i = 0; i < lines.length; i++) {
    switch (lines[i]) {
      case 'a=sendrecv':
      case 'a=sendonly':
      case 'a=recvonly':
      case 'a=inactive':
        return lines[i].substr(2);
      default:
        // FIXME: What should happen here?
    }
  }
  if (sessionpart) {
    return SDPUtils.getDirection(sessionpart);
  }
  return 'sendrecv';
};

SDPUtils.getKind = function(mediaSection) {
  var lines = SDPUtils.splitLines(mediaSection);
  var mline = lines[0].split(' ');
  return mline[0].substr(2);
};

SDPUtils.isRejected = function(mediaSection) {
  return mediaSection.split(' ', 2)[1] === '0';
};

// Expose public methods.
module.exports = SDPUtils;

},{}],2:[function(require,module,exports){
(function (global){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */

'use strict';

var adapterFactory = require('./adapter_factory.js');
module.exports = adapterFactory({window: global.window});

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./adapter_factory.js":3}],3:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */

'use strict';

// Shimming starts here.
module.exports = function(dependencies) {
  var window = dependencies && dependencies.window;

  // Utils.
  var utils = require('./utils');
  var logging = utils.log;
  var browserDetails = utils.detectBrowser(window);

  // Export to the adapter global object visible in the browser.
  var adapter = {
    browserDetails: browserDetails,
    extractVersion: utils.extractVersion,
    disableLog: utils.disableLog
  };

  // Uncomment the line below if you want logging to occur, including logging
  // for the switch statement below. Can also be turned on in the browser via
  // adapter.disableLog(false), but then logging from the switch statement below
  // will not appear.
  // require('./utils').disableLog(false);

  // Browser shims.
  var chromeShim = require('./chrome/chrome_shim') || null;
  var edgeShim = require('./edge/edge_shim') || null;
  var firefoxShim = require('./firefox/firefox_shim') || null;
  var safariShim = require('./safari/safari_shim') || null;

  // Shim browser if found.
  switch (browserDetails.browser) {
    case 'chrome':
      if (!chromeShim || !chromeShim.shimPeerConnection) {
        logging('Chrome shim is not included in this adapter release.');
        return adapter;
      }
      logging('adapter.js shimming chrome.');
      // Export to the adapter global object visible in the browser.
      adapter.browserShim = chromeShim;

      chromeShim.shimGetUserMedia(window);
      chromeShim.shimMediaStream(window);
      utils.shimCreateObjectURL(window);
      chromeShim.shimSourceObject(window);
      chromeShim.shimPeerConnection(window);
      chromeShim.shimOnTrack(window);
      chromeShim.shimGetSendersWithDtmf(window);
      break;
    case 'firefox':
      if (!firefoxShim || !firefoxShim.shimPeerConnection) {
        logging('Firefox shim is not included in this adapter release.');
        return adapter;
      }
      logging('adapter.js shimming firefox.');
      // Export to the adapter global object visible in the browser.
      adapter.browserShim = firefoxShim;

      firefoxShim.shimGetUserMedia(window);
      utils.shimCreateObjectURL(window);
      firefoxShim.shimSourceObject(window);
      firefoxShim.shimPeerConnection(window);
      firefoxShim.shimOnTrack(window);
      break;
    case 'edge':
      if (!edgeShim || !edgeShim.shimPeerConnection) {
        logging('MS edge shim is not included in this adapter release.');
        return adapter;
      }
      logging('adapter.js shimming edge.');
      // Export to the adapter global object visible in the browser.
      adapter.browserShim = edgeShim;

      edgeShim.shimGetUserMedia(window);
      utils.shimCreateObjectURL(window);
      edgeShim.shimPeerConnection(window);
      edgeShim.shimReplaceTrack(window);
      break;
    case 'safari':
      if (!safariShim) {
        logging('Safari shim is not included in this adapter release.');
        return adapter;
      }
      logging('adapter.js shimming safari.');
      // Export to the adapter global object visible in the browser.
      adapter.browserShim = safariShim;

      safariShim.shimCallbacksAPI(window);
      safariShim.shimAddStream(window);
      safariShim.shimOnAddStream(window);
      safariShim.shimGetUserMedia(window);
      break;
    default:
      logging('Unsupported browser!');
      break;
  }

  return adapter;
};

},{"./chrome/chrome_shim":4,"./edge/edge_shim":6,"./firefox/firefox_shim":9,"./safari/safari_shim":11,"./utils":12}],4:[function(require,module,exports){

/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';
var utils = require('../utils.js');
var logging = utils.log;

var chromeShim = {
  shimMediaStream: function(window) {
    window.MediaStream = window.MediaStream || window.webkitMediaStream;
  },

  shimOnTrack: function(window) {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          var self = this;
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', this._ontrackpoly = function(e) {
            // onaddstream does not fire when a track is added to an existing
            // stream. But stream.onaddtrack is implemented so we use that.
            e.stream.addEventListener('addtrack', function(te) {
              var receiver;
              if (window.RTCPeerConnection.prototype.getReceivers) {
                receiver = self.getReceivers().find(function(r) {
                  return r.track.id === te.track.id;
                });
              } else {
                receiver = {track: te.track};
              }

              var event = new Event('track');
              event.track = te.track;
              event.receiver = receiver;
              event.streams = [e.stream];
              self.dispatchEvent(event);
            });
            e.stream.getTracks().forEach(function(track) {
              var receiver;
              if (window.RTCPeerConnection.prototype.getReceivers) {
                receiver = self.getReceivers().find(function(r) {
                  return r.track.id === track.id;
                });
              } else {
                receiver = {track: track};
              }
              var event = new Event('track');
              event.track = track;
              event.receiver = receiver;
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimGetSendersWithDtmf: function(window) {
    if (typeof window === 'object' && window.RTCPeerConnection &&
        !('getSenders' in window.RTCPeerConnection.prototype) &&
        'createDTMFSender' in window.RTCPeerConnection.prototype) {
      window.RTCPeerConnection.prototype.getSenders = function() {
        return this._senders || [];
      };
      var origAddStream = window.RTCPeerConnection.prototype.addStream;
      var origRemoveStream = window.RTCPeerConnection.prototype.removeStream;

      if (!window.RTCPeerConnection.prototype.addTrack) {
        window.RTCPeerConnection.prototype.addTrack = function(track, stream) {
          var pc = this;
          if (pc.signalingState === 'closed') {
            throw new DOMException(
              'The RTCPeerConnection\'s signalingState is \'closed\'.',
              'InvalidStateError');
          }
          var streams = [].slice.call(arguments, 1);
          if (streams.length !== 1 ||
              !streams[0].getTracks().find(function(t) {
                return t === track;
              })) {
            // this is not fully correct but all we can manage without
            // [[associated MediaStreams]] internal slot.
            throw new DOMException(
              'The adapter.js addTrack polyfill only supports a single ' +
              ' stream which is associated with the specified track.',
              'NotSupportedError');
          }

          pc._senders = pc._senders || [];
          var alreadyExists = pc._senders.find(function(t) {
            return t.track === track;
          });
          if (alreadyExists) {
            throw new DOMException('Track already exists.',
                'InvalidAccessError');
          }

          pc._streams = pc._streams || {};
          var oldStream = pc._streams[stream.id];
          if (oldStream) {
            oldStream.addTrack(track);
            pc.removeStream(oldStream);
            pc.addStream(oldStream);
          } else {
            var newStream = new window.MediaStream([track]);
            pc._streams[stream.id] = newStream;
            pc.addStream(newStream);
          }

          var sender = {
            track: track,
            get dtmf() {
              if (this._dtmf === undefined) {
                if (track.kind === 'audio') {
                  this._dtmf = pc.createDTMFSender(track);
                } else {
                  this._dtmf = null;
                }
              }
              return this._dtmf;
            }
          };
          pc._senders.push(sender);
          return sender;
        };
      }
      window.RTCPeerConnection.prototype.addStream = function(stream) {
        var pc = this;
        pc._senders = pc._senders || [];
        origAddStream.apply(pc, [stream]);
        stream.getTracks().forEach(function(track) {
          pc._senders.push({
            track: track,
            get dtmf() {
              if (this._dtmf === undefined) {
                if (track.kind === 'audio') {
                  this._dtmf = pc.createDTMFSender(track);
                } else {
                  this._dtmf = null;
                }
              }
              return this._dtmf;
            }
          });
        });
      };

      window.RTCPeerConnection.prototype.removeStream = function(stream) {
        var pc = this;
        pc._senders = pc._senders || [];
        origRemoveStream.apply(pc, [stream]);
        stream.getTracks().forEach(function(track) {
          var sender = pc._senders.find(function(s) {
            return s.track === track;
          });
          if (sender) {
            pc._senders.splice(pc._senders.indexOf(sender), 1); // remove sender
          }
        });
      };
    }
  },

  shimSourceObject: function(window) {
    var URL = window && window.URL;

    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this._srcObject;
          },
          set: function(stream) {
            var self = this;
            // Use _srcObject as a private property for this shim
            this._srcObject = stream;
            if (this.src) {
              URL.revokeObjectURL(this.src);
            }

            if (!stream) {
              this.src = '';
              return undefined;
            }
            this.src = URL.createObjectURL(stream);
            // We need to recreate the blob url when a track is added or
            // removed. Doing it manually since we want to avoid a recursion.
            stream.addEventListener('addtrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
            stream.addEventListener('removetrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
          }
        });
      }
    }
  },

  shimPeerConnection: function(window) {
    var browserDetails = utils.detectBrowser(window);

    // The RTCPeerConnection object.
    if (!window.RTCPeerConnection) {
      window.RTCPeerConnection = function(pcConfig, pcConstraints) {
        // Translate iceTransportPolicy to iceTransports,
        // see https://code.google.com/p/webrtc/issues/detail?id=4869
        // this was fixed in M56 along with unprefixing RTCPeerConnection.
        logging('PeerConnection');
        if (pcConfig && pcConfig.iceTransportPolicy) {
          pcConfig.iceTransports = pcConfig.iceTransportPolicy;
        }

        return new window.webkitRTCPeerConnection(pcConfig, pcConstraints);
      };
      window.RTCPeerConnection.prototype =
          window.webkitRTCPeerConnection.prototype;
      // wrap static methods. Currently just generateCertificate.
      if (window.webkitRTCPeerConnection.generateCertificate) {
        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
          get: function() {
            return window.webkitRTCPeerConnection.generateCertificate;
          }
        });
      }
    } else {
      // migrate from non-spec RTCIceServer.url to RTCIceServer.urls
      var OrigPeerConnection = window.RTCPeerConnection;
      window.RTCPeerConnection = function(pcConfig, pcConstraints) {
        if (pcConfig && pcConfig.iceServers) {
          var newIceServers = [];
          for (var i = 0; i < pcConfig.iceServers.length; i++) {
            var server = pcConfig.iceServers[i];
            if (!server.hasOwnProperty('urls') &&
                server.hasOwnProperty('url')) {
              console.warn('RTCIceServer.url is deprecated! Use urls instead.');
              server = JSON.parse(JSON.stringify(server));
              server.urls = server.url;
              newIceServers.push(server);
            } else {
              newIceServers.push(pcConfig.iceServers[i]);
            }
          }
          pcConfig.iceServers = newIceServers;
        }
        return new OrigPeerConnection(pcConfig, pcConstraints);
      };
      window.RTCPeerConnection.prototype = OrigPeerConnection.prototype;
      // wrap static methods. Currently just generateCertificate.
      Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
        get: function() {
          return OrigPeerConnection.generateCertificate;
        }
      });
    }

    var origGetStats = window.RTCPeerConnection.prototype.getStats;
    window.RTCPeerConnection.prototype.getStats = function(selector,
        successCallback, errorCallback) {
      var self = this;
      var args = arguments;

      // If selector is a function then we are in the old style stats so just
      // pass back the original getStats format to avoid breaking old users.
      if (arguments.length > 0 && typeof selector === 'function') {
        return origGetStats.apply(this, arguments);
      }

      // When spec-style getStats is supported, return those when called with
      // either no arguments or the selector argument is null.
      if (origGetStats.length === 0 && (arguments.length === 0 ||
          typeof arguments[0] !== 'function')) {
        return origGetStats.apply(this, []);
      }

      var fixChromeStats_ = function(response) {
        var standardReport = {};
        var reports = response.result();
        reports.forEach(function(report) {
          var standardStats = {
            id: report.id,
            timestamp: report.timestamp,
            type: {
              localcandidate: 'local-candidate',
              remotecandidate: 'remote-candidate'
            }[report.type] || report.type
          };
          report.names().forEach(function(name) {
            standardStats[name] = report.stat(name);
          });
          standardReport[standardStats.id] = standardStats;
        });

        return standardReport;
      };

      // shim getStats with maplike support
      var makeMapStats = function(stats) {
        return new Map(Object.keys(stats).map(function(key) {
          return [key, stats[key]];
        }));
      };

      if (arguments.length >= 2) {
        var successCallbackWrapper_ = function(response) {
          args[1](makeMapStats(fixChromeStats_(response)));
        };

        return origGetStats.apply(this, [successCallbackWrapper_,
          arguments[0]]);
      }

      // promise-support
      return new Promise(function(resolve, reject) {
        origGetStats.apply(self, [
          function(response) {
            resolve(makeMapStats(fixChromeStats_(response)));
          }, reject]);
      }).then(successCallback, errorCallback);
    };

    // add promise support -- natively available in Chrome 51
    if (browserDetails.version < 51) {
      ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
          .forEach(function(method) {
            var nativeMethod = window.RTCPeerConnection.prototype[method];
            window.RTCPeerConnection.prototype[method] = function() {
              var args = arguments;
              var self = this;
              var promise = new Promise(function(resolve, reject) {
                nativeMethod.apply(self, [args[0], resolve, reject]);
              });
              if (args.length < 2) {
                return promise;
              }
              return promise.then(function() {
                args[1].apply(null, []);
              },
              function(err) {
                if (args.length >= 3) {
                  args[2].apply(null, [err]);
                }
              });
            };
          });
    }

    // promise support for createOffer and createAnswer. Available (without
    // bugs) since M52: crbug/619289
    if (browserDetails.version < 52) {
      ['createOffer', 'createAnswer'].forEach(function(method) {
        var nativeMethod = window.RTCPeerConnection.prototype[method];
        window.RTCPeerConnection.prototype[method] = function() {
          var self = this;
          if (arguments.length < 1 || (arguments.length === 1 &&
              typeof arguments[0] === 'object')) {
            var opts = arguments.length === 1 ? arguments[0] : undefined;
            return new Promise(function(resolve, reject) {
              nativeMethod.apply(self, [resolve, reject, opts]);
            });
          }
          return nativeMethod.apply(this, arguments);
        };
      });
    }

    // shim implicit creation of RTCSessionDescription/RTCIceCandidate
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = window.RTCPeerConnection.prototype[method];
          window.RTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                window.RTCIceCandidate :
                window.RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null or undefined)
    var nativeAddIceCandidate =
        window.RTCPeerConnection.prototype.addIceCandidate;
    window.RTCPeerConnection.prototype.addIceCandidate = function() {
      if (!arguments[0]) {
        if (arguments[1]) {
          arguments[1].apply(null);
        }
        return Promise.resolve();
      }
      return nativeAddIceCandidate.apply(this, arguments);
    };
  }
};


// Expose public methods.
module.exports = {
  shimMediaStream: chromeShim.shimMediaStream,
  shimOnTrack: chromeShim.shimOnTrack,
  shimGetSendersWithDtmf: chromeShim.shimGetSendersWithDtmf,
  shimSourceObject: chromeShim.shimSourceObject,
  shimPeerConnection: chromeShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils.js":12,"./getusermedia":5}],5:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';
var utils = require('../utils.js');
var logging = utils.log;

// Expose public methods.
module.exports = function(window) {
  var browserDetails = utils.detectBrowser(window);
  var navigator = window && window.navigator;

  var constraintsToChrome_ = function(c) {
    if (typeof c !== 'object' || c.mandatory || c.optional) {
      return c;
    }
    var cc = {};
    Object.keys(c).forEach(function(key) {
      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
        return;
      }
      var r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};
      if (r.exact !== undefined && typeof r.exact === 'number') {
        r.min = r.max = r.exact;
      }
      var oldname_ = function(prefix, name) {
        if (prefix) {
          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
        }
        return (name === 'deviceId') ? 'sourceId' : name;
      };
      if (r.ideal !== undefined) {
        cc.optional = cc.optional || [];
        var oc = {};
        if (typeof r.ideal === 'number') {
          oc[oldname_('min', key)] = r.ideal;
          cc.optional.push(oc);
          oc = {};
          oc[oldname_('max', key)] = r.ideal;
          cc.optional.push(oc);
        } else {
          oc[oldname_('', key)] = r.ideal;
          cc.optional.push(oc);
        }
      }
      if (r.exact !== undefined && typeof r.exact !== 'number') {
        cc.mandatory = cc.mandatory || {};
        cc.mandatory[oldname_('', key)] = r.exact;
      } else {
        ['min', 'max'].forEach(function(mix) {
          if (r[mix] !== undefined) {
            cc.mandatory = cc.mandatory || {};
            cc.mandatory[oldname_(mix, key)] = r[mix];
          }
        });
      }
    });
    if (c.advanced) {
      cc.optional = (cc.optional || []).concat(c.advanced);
    }
    return cc;
  };

  var shimConstraints_ = function(constraints, func) {
    constraints = JSON.parse(JSON.stringify(constraints));
    if (constraints && typeof constraints.audio === 'object') {
      var remap = function(obj, a, b) {
        if (a in obj && !(b in obj)) {
          obj[b] = obj[a];
          delete obj[a];
        }
      };
      constraints = JSON.parse(JSON.stringify(constraints));
      remap(constraints.audio, 'autoGainControl', 'googAutoGainControl');
      remap(constraints.audio, 'noiseSuppression', 'googNoiseSuppression');
      constraints.audio = constraintsToChrome_(constraints.audio);
    }
    if (constraints && typeof constraints.video === 'object') {
      // Shim facingMode for mobile & surface pro.
      var face = constraints.video.facingMode;
      face = face && ((typeof face === 'object') ? face : {ideal: face});
      var getSupportedFacingModeLies = browserDetails.version < 61;

      if ((face && (face.exact === 'user' || face.exact === 'environment' ||
                    face.ideal === 'user' || face.ideal === 'environment')) &&
          !(navigator.mediaDevices.getSupportedConstraints &&
            navigator.mediaDevices.getSupportedConstraints().facingMode &&
            !getSupportedFacingModeLies)) {
        delete constraints.video.facingMode;
        var matches;
        if (face.exact === 'environment' || face.ideal === 'environment') {
          matches = ['back', 'rear'];
        } else if (face.exact === 'user' || face.ideal === 'user') {
          matches = ['front'];
        }
        if (matches) {
          // Look for matches in label, or use last cam for back (typical).
          return navigator.mediaDevices.enumerateDevices()
          .then(function(devices) {
            devices = devices.filter(function(d) {
              return d.kind === 'videoinput';
            });
            var dev = devices.find(function(d) {
              return matches.some(function(match) {
                return d.label.toLowerCase().indexOf(match) !== -1;
              });
            });
            if (!dev && devices.length && matches.indexOf('back') !== -1) {
              dev = devices[devices.length - 1]; // more likely the back cam
            }
            if (dev) {
              constraints.video.deviceId = face.exact ? {exact: dev.deviceId} :
                                                        {ideal: dev.deviceId};
            }
            constraints.video = constraintsToChrome_(constraints.video);
            logging('chrome: ' + JSON.stringify(constraints));
            return func(constraints);
          });
        }
      }
      constraints.video = constraintsToChrome_(constraints.video);
    }
    logging('chrome: ' + JSON.stringify(constraints));
    return func(constraints);
  };

  var shimError_ = function(e) {
    return {
      name: {
        PermissionDeniedError: 'NotAllowedError',
        InvalidStateError: 'NotReadableError',
        DevicesNotFoundError: 'NotFoundError',
        ConstraintNotSatisfiedError: 'OverconstrainedError',
        TrackStartError: 'NotReadableError',
        MediaDeviceFailedDueToShutdown: 'NotReadableError',
        MediaDeviceKillSwitchOn: 'NotReadableError'
      }[e.name] || e.name,
      message: e.message,
      constraint: e.constraintName,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  var getUserMedia_ = function(constraints, onSuccess, onError) {
    shimConstraints_(constraints, function(c) {
      navigator.webkitGetUserMedia(c, onSuccess, function(e) {
        onError(shimError_(e));
      });
    });
  };

  navigator.getUserMedia = getUserMedia_;

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      navigator.getUserMedia(constraints, resolve, reject);
    });
  };

  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {
      getUserMedia: getUserMediaPromise_,
      enumerateDevices: function() {
        return new Promise(function(resolve) {
          var kinds = {audio: 'audioinput', video: 'videoinput'};
          return window.MediaStreamTrack.getSources(function(devices) {
            resolve(devices.map(function(device) {
              return {label: device.label,
                kind: kinds[device.kind],
                deviceId: device.id,
                groupId: ''};
            }));
          });
        });
      },
      getSupportedConstraints: function() {
        return {
          deviceId: true, echoCancellation: true, facingMode: true,
          frameRate: true, height: true, width: true
        };
      }
    };
  }

  // A shim for getUserMedia method on the mediaDevices object.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (!navigator.mediaDevices.getUserMedia) {
    navigator.mediaDevices.getUserMedia = function(constraints) {
      return getUserMediaPromise_(constraints);
    };
  } else {
    // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
    // function which returns a Promise, it does not accept spec-style
    // constraints.
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(cs) {
      return shimConstraints_(cs, function(c) {
        return origGetUserMedia(c).then(function(stream) {
          if (c.audio && !stream.getAudioTracks().length ||
              c.video && !stream.getVideoTracks().length) {
            stream.getTracks().forEach(function(track) {
              track.stop();
            });
            throw new DOMException('', 'NotFoundError');
          }
          return stream;
        }, function(e) {
          return Promise.reject(shimError_(e));
        });
      });
    };
  }

  // Dummy devicechange event methods.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (typeof navigator.mediaDevices.addEventListener === 'undefined') {
    navigator.mediaDevices.addEventListener = function() {
      logging('Dummy mediaDevices.addEventListener called.');
    };
  }
  if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {
    navigator.mediaDevices.removeEventListener = function() {
      logging('Dummy mediaDevices.removeEventListener called.');
    };
  }
};

},{"../utils.js":12}],6:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var utils = require('../utils');
var shimRTCPeerConnection = require('./rtcpeerconnection_shim');

module.exports = {
  shimGetUserMedia: require('./getusermedia'),
  shimPeerConnection: function(window) {
    var browserDetails = utils.detectBrowser(window);

    if (window.RTCIceGatherer) {
      // ORTC defines an RTCIceCandidate object but no constructor.
      // Not implemented in Edge.
      if (!window.RTCIceCandidate) {
        window.RTCIceCandidate = function(args) {
          return args;
        };
      }
      // ORTC does not have a session description object but
      // other browsers (i.e. Chrome) that will support both PC and ORTC
      // in the future might have this defined already.
      if (!window.RTCSessionDescription) {
        window.RTCSessionDescription = function(args) {
          return args;
        };
      }
      // this adds an additional event listener to MediaStrackTrack that signals
      // when a tracks enabled property was changed. Workaround for a bug in
      // addStream, see below. No longer required in 15025+
      if (browserDetails.version < 15025) {
        var origMSTEnabled = Object.getOwnPropertyDescriptor(
            window.MediaStreamTrack.prototype, 'enabled');
        Object.defineProperty(window.MediaStreamTrack.prototype, 'enabled', {
          set: function(value) {
            origMSTEnabled.set.call(this, value);
            var ev = new Event('enabled');
            ev.enabled = value;
            this.dispatchEvent(ev);
          }
        });
      }
    }
    window.RTCPeerConnection =
        shimRTCPeerConnection(window, browserDetails.version);
  },
  shimReplaceTrack: function(window) {
    // ORTC has replaceTrack -- https://github.com/w3c/ortc/issues/614
    if (window.RTCRtpSender &&
        !('replaceTrack' in window.RTCRtpSender.prototype)) {
      window.RTCRtpSender.prototype.replaceTrack =
          window.RTCRtpSender.prototype.setTrack;
    }
  }
};

},{"../utils":12,"./getusermedia":7,"./rtcpeerconnection_shim":8}],7:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

// Expose public methods.
module.exports = function(window) {
  var navigator = window && window.navigator;

  var shimError_ = function(e) {
    return {
      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,
      message: e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name;
      }
    };
  };

  // getUserMedia error shim.
  var origGetUserMedia = navigator.mediaDevices.getUserMedia.
      bind(navigator.mediaDevices);
  navigator.mediaDevices.getUserMedia = function(c) {
    return origGetUserMedia(c).catch(function(e) {
      return Promise.reject(shimError_(e));
    });
  };
};

},{}],8:[function(require,module,exports){
/*
 *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var SDPUtils = require('sdp');

// sort tracks such that they follow an a-v-a-v...
// pattern.
function sortTracks(tracks) {
  var audioTracks = tracks.filter(function(track) {
    return track.kind === 'audio';
  });
  var videoTracks = tracks.filter(function(track) {
    return track.kind === 'video';
  });
  tracks = [];
  while (audioTracks.length || videoTracks.length) {
    if (audioTracks.length) {
      tracks.push(audioTracks.shift());
    }
    if (videoTracks.length) {
      tracks.push(videoTracks.shift());
    }
  }
  return tracks;
}

// Edge does not like
// 1) stun:
// 2) turn: that does not have all of turn:host:port?transport=udp
// 3) turn: with ipv6 addresses
// 4) turn: occurring muliple times
function filterIceServers(iceServers, edgeVersion) {
  var hasTurn = false;
  iceServers = JSON.parse(JSON.stringify(iceServers));
  return iceServers.filter(function(server) {
    if (server && (server.urls || server.url)) {
      var urls = server.urls || server.url;
      if (server.url && !server.urls) {
        console.warn('RTCIceServer.url is deprecated! Use urls instead.');
      }
      var isString = typeof urls === 'string';
      if (isString) {
        urls = [urls];
      }
      urls = urls.filter(function(url) {
        var validTurn = url.indexOf('turn:') === 0 &&
            url.indexOf('transport=udp') !== -1 &&
            url.indexOf('turn:[') === -1 &&
            !hasTurn;

        if (validTurn) {
          hasTurn = true;
          return true;
        }
        return url.indexOf('stun:') === 0 && edgeVersion >= 14393;
      });

      delete server.url;
      server.urls = isString ? urls[0] : urls;
      return !!urls.length;
    }
    return false;
  });
}

// Determines the intersection of local and remote capabilities.
function getCommonCapabilities(localCapabilities, remoteCapabilities) {
  var commonCapabilities = {
    codecs: [],
    headerExtensions: [],
    fecMechanisms: []
  };

  var findCodecByPayloadType = function(pt, codecs) {
    pt = parseInt(pt, 10);
    for (var i = 0; i < codecs.length; i++) {
      if (codecs[i].payloadType === pt ||
          codecs[i].preferredPayloadType === pt) {
        return codecs[i];
      }
    }
  };

  var rtxCapabilityMatches = function(lRtx, rRtx, lCodecs, rCodecs) {
    var lCodec = findCodecByPayloadType(lRtx.parameters.apt, lCodecs);
    var rCodec = findCodecByPayloadType(rRtx.parameters.apt, rCodecs);
    return lCodec && rCodec &&
        lCodec.name.toLowerCase() === rCodec.name.toLowerCase();
  };

  localCapabilities.codecs.forEach(function(lCodec) {
    for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
      var rCodec = remoteCapabilities.codecs[i];
      if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
          lCodec.clockRate === rCodec.clockRate) {
        if (lCodec.name.toLowerCase() === 'rtx' &&
            lCodec.parameters && rCodec.parameters.apt) {
          // for RTX we need to find the local rtx that has a apt
          // which points to the same local codec as the remote one.
          if (!rtxCapabilityMatches(lCodec, rCodec,
              localCapabilities.codecs, remoteCapabilities.codecs)) {
            continue;
          }
        }
        rCodec = JSON.parse(JSON.stringify(rCodec)); // deepcopy
        // number of channels is the highest common number of channels
        rCodec.numChannels = Math.min(lCodec.numChannels,
            rCodec.numChannels);
        // push rCodec so we reply with offerer payload type
        commonCapabilities.codecs.push(rCodec);

        // determine common feedback mechanisms
        rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
          for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
            if (lCodec.rtcpFeedback[j].type === fb.type &&
                lCodec.rtcpFeedback[j].parameter === fb.parameter) {
              return true;
            }
          }
          return false;
        });
        // FIXME: also need to determine .parameters
        //  see https://github.com/openpeer/ortc/issues/569
        break;
      }
    }
  });

  localCapabilities.headerExtensions.forEach(function(lHeaderExtension) {
    for (var i = 0; i < remoteCapabilities.headerExtensions.length;
         i++) {
      var rHeaderExtension = remoteCapabilities.headerExtensions[i];
      if (lHeaderExtension.uri === rHeaderExtension.uri) {
        commonCapabilities.headerExtensions.push(rHeaderExtension);
        break;
      }
    }
  });

  // FIXME: fecMechanisms
  return commonCapabilities;
}

// is action=setLocalDescription with type allowed in signalingState
function isActionAllowedInSignalingState(action, type, signalingState) {
  return {
    offer: {
      setLocalDescription: ['stable', 'have-local-offer'],
      setRemoteDescription: ['stable', 'have-remote-offer']
    },
    answer: {
      setLocalDescription: ['have-remote-offer', 'have-local-pranswer'],
      setRemoteDescription: ['have-local-offer', 'have-remote-pranswer']
    }
  }[type][action].indexOf(signalingState) !== -1;
}

module.exports = function(window, edgeVersion) {
  var RTCPeerConnection = function(config) {
    var self = this;

    var _eventTarget = document.createDocumentFragment();
    ['addEventListener', 'removeEventListener', 'dispatchEvent']
        .forEach(function(method) {
          self[method] = _eventTarget[method].bind(_eventTarget);
        });

    this.needNegotiation = false;

    this.onicecandidate = null;
    this.onaddstream = null;
    this.ontrack = null;
    this.onremovestream = null;
    this.onsignalingstatechange = null;
    this.oniceconnectionstatechange = null;
    this.onicegatheringstatechange = null;
    this.onnegotiationneeded = null;
    this.ondatachannel = null;
    this.canTrickleIceCandidates = null;

    this.localStreams = [];
    this.remoteStreams = [];
    this.getLocalStreams = function() {
      return self.localStreams;
    };
    this.getRemoteStreams = function() {
      return self.remoteStreams;
    };

    this.localDescription = new window.RTCSessionDescription({
      type: '',
      sdp: ''
    });
    this.remoteDescription = new window.RTCSessionDescription({
      type: '',
      sdp: ''
    });
    this.signalingState = 'stable';
    this.iceConnectionState = 'new';
    this.iceGatheringState = 'new';

    this.iceOptions = {
      gatherPolicy: 'all',
      iceServers: []
    };
    if (config && config.iceTransportPolicy) {
      switch (config.iceTransportPolicy) {
        case 'all':
        case 'relay':
          this.iceOptions.gatherPolicy = config.iceTransportPolicy;
          break;
        default:
          // don't set iceTransportPolicy.
          break;
      }
    }
    this.usingBundle = config && config.bundlePolicy === 'max-bundle';

    if (config && config.iceServers) {
      this.iceOptions.iceServers = filterIceServers(config.iceServers,
          edgeVersion);
    }
    this._config = config || {};

    // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
    // everything that is needed to describe a SDP m-line.
    this.transceivers = [];

    // since the iceGatherer is currently created in createOffer but we
    // must not emit candidates until after setLocalDescription we buffer
    // them in this array.
    this._localIceCandidatesBuffer = [];
  };

  RTCPeerConnection.prototype._emitGatheringStateChange = function() {
    var event = new Event('icegatheringstatechange');
    this.dispatchEvent(event);
    if (this.onicegatheringstatechange !== null) {
      this.onicegatheringstatechange(event);
    }
  };

  RTCPeerConnection.prototype._emitBufferedCandidates = function() {
    var self = this;
    var sections = SDPUtils.splitSections(self.localDescription.sdp);
    // FIXME: need to apply ice candidates in a way which is async but
    // in-order
    this._localIceCandidatesBuffer.forEach(function(event) {
      var end = !event.candidate || Object.keys(event.candidate).length === 0;
      if (end) {
        for (var j = 1; j < sections.length; j++) {
          if (sections[j].indexOf('\r\na=end-of-candidates\r\n') === -1) {
            sections[j] += 'a=end-of-candidates\r\n';
          }
        }
      } else {
        sections[event.candidate.sdpMLineIndex + 1] +=
            'a=' + event.candidate.candidate + '\r\n';
      }
      self.localDescription.sdp = sections.join('');
      self.dispatchEvent(event);
      if (self.onicecandidate !== null) {
        self.onicecandidate(event);
      }
      if (!event.candidate && self.iceGatheringState !== 'complete') {
        var complete = self.transceivers.every(function(transceiver) {
          return transceiver.iceGatherer &&
              transceiver.iceGatherer.state === 'completed';
        });
        if (complete && self.iceGatheringStateChange !== 'complete') {
          self.iceGatheringState = 'complete';
          self._emitGatheringStateChange();
        }
      }
    });
    this._localIceCandidatesBuffer = [];
  };

  RTCPeerConnection.prototype.getConfiguration = function() {
    return this._config;
  };

  // internal helper to create a transceiver object.
  // (whih is not yet the same as the WebRTC 1.0 transceiver)
  RTCPeerConnection.prototype._createTransceiver = function(kind) {
    var hasBundleTransport = this.transceivers.length > 0;
    var transceiver = {
      track: null,
      iceGatherer: null,
      iceTransport: null,
      dtlsTransport: null,
      localCapabilities: null,
      remoteCapabilities: null,
      rtpSender: null,
      rtpReceiver: null,
      kind: kind,
      mid: null,
      sendEncodingParameters: null,
      recvEncodingParameters: null,
      stream: null,
      wantReceive: true
    };
    if (this.usingBundle && hasBundleTransport) {
      transceiver.iceTransport = this.transceivers[0].iceTransport;
      transceiver.dtlsTransport = this.transceivers[0].dtlsTransport;
    } else {
      var transports = this._createIceAndDtlsTransports();
      transceiver.iceTransport = transports.iceTransport;
      transceiver.dtlsTransport = transports.dtlsTransport;
    }
    this.transceivers.push(transceiver);
    return transceiver;
  };

  RTCPeerConnection.prototype.addTrack = function(track, stream) {
    var transceiver;
    for (var i = 0; i < this.transceivers.length; i++) {
      if (!this.transceivers[i].track &&
          this.transceivers[i].kind === track.kind) {
        transceiver = this.transceivers[i];
      }
    }
    if (!transceiver) {
      transceiver = this._createTransceiver(track.kind);
    }

    transceiver.track = track;
    transceiver.stream = stream;
    transceiver.rtpSender = new window.RTCRtpSender(track,
        transceiver.dtlsTransport);

    this._maybeFireNegotiationNeeded();
    return transceiver.rtpSender;
  };

  RTCPeerConnection.prototype.addStream = function(stream) {
    var self = this;
    if (edgeVersion >= 15025) {
      this.localStreams.push(stream);
      stream.getTracks().forEach(function(track) {
        self.addTrack(track, stream);
      });
    } else {
      // Clone is necessary for local demos mostly, attaching directly
      // to two different senders does not work (build 10547).
      // Fixed in 15025 (or earlier)
      var clonedStream = stream.clone();
      stream.getTracks().forEach(function(track, idx) {
        var clonedTrack = clonedStream.getTracks()[idx];
        track.addEventListener('enabled', function(event) {
          clonedTrack.enabled = event.enabled;
        });
      });
      clonedStream.getTracks().forEach(function(track) {
        self.addTrack(track, clonedStream);
      });
      this.localStreams.push(clonedStream);
    }
    this._maybeFireNegotiationNeeded();
  };

  RTCPeerConnection.prototype.removeStream = function(stream) {
    var idx = this.localStreams.indexOf(stream);
    if (idx > -1) {
      this.localStreams.splice(idx, 1);
      this._maybeFireNegotiationNeeded();
    }
  };

  RTCPeerConnection.prototype.getSenders = function() {
    return this.transceivers.filter(function(transceiver) {
      return !!transceiver.rtpSender;
    })
    .map(function(transceiver) {
      return transceiver.rtpSender;
    });
  };

  RTCPeerConnection.prototype.getReceivers = function() {
    return this.transceivers.filter(function(transceiver) {
      return !!transceiver.rtpReceiver;
    })
    .map(function(transceiver) {
      return transceiver.rtpReceiver;
    });
  };

  // Create ICE gatherer and hook it up.
  RTCPeerConnection.prototype._createIceGatherer = function(mid,
      sdpMLineIndex) {
    var self = this;
    var iceGatherer = new window.RTCIceGatherer(self.iceOptions);
    iceGatherer.onlocalcandidate = function(evt) {
      var event = new Event('icecandidate');
      event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};

      var cand = evt.candidate;
      var end = !cand || Object.keys(cand).length === 0;
      // Edge emits an empty object for RTCIceCandidateComplete‥
      if (end) {
        // polyfill since RTCIceGatherer.state is not implemented in
        // Edge 10547 yet.
        if (iceGatherer.state === undefined) {
          iceGatherer.state = 'completed';
        }
      } else {
        // RTCIceCandidate doesn't have a component, needs to be added
        cand.component = 1;
        event.candidate.candidate = SDPUtils.writeCandidate(cand);
      }

      // update local description.
      var sections = SDPUtils.splitSections(self.localDescription.sdp);
      if (!end) {
        sections[event.candidate.sdpMLineIndex + 1] +=
            'a=' + event.candidate.candidate + '\r\n';
      } else {
        sections[event.candidate.sdpMLineIndex + 1] +=
            'a=end-of-candidates\r\n';
      }
      self.localDescription.sdp = sections.join('');
      var transceivers = self._pendingOffer ? self._pendingOffer :
          self.transceivers;
      var complete = transceivers.every(function(transceiver) {
        return transceiver.iceGatherer &&
            transceiver.iceGatherer.state === 'completed';
      });

      // Emit candidate if localDescription is set.
      // Also emits null candidate when all gatherers are complete.
      switch (self.iceGatheringState) {
        case 'new':
          if (!end) {
            self._localIceCandidatesBuffer.push(event);
          }
          if (end && complete) {
            self._localIceCandidatesBuffer.push(
                new Event('icecandidate'));
          }
          break;
        case 'gathering':
          self._emitBufferedCandidates();
          if (!end) {
            self.dispatchEvent(event);
            if (self.onicecandidate !== null) {
              self.onicecandidate(event);
            }
          }
          if (complete) {
            self.dispatchEvent(new Event('icecandidate'));
            if (self.onicecandidate !== null) {
              self.onicecandidate(new Event('icecandidate'));
            }
            self.iceGatheringState = 'complete';
            self._emitGatheringStateChange();
          }
          break;
        case 'complete':
          // should not happen... currently!
          break;
        default: // no-op.
          break;
      }
    };
    return iceGatherer;
  };

  // Create ICE transport and DTLS transport.
  RTCPeerConnection.prototype._createIceAndDtlsTransports = function() {
    var self = this;
    var iceTransport = new window.RTCIceTransport(null);
    iceTransport.onicestatechange = function() {
      self._updateConnectionState();
    };

    var dtlsTransport = new window.RTCDtlsTransport(iceTransport);
    dtlsTransport.ondtlsstatechange = function() {
      self._updateConnectionState();
    };
    dtlsTransport.onerror = function() {
      // onerror does not set state to failed by itself.
      Object.defineProperty(dtlsTransport, 'state',
          {value: 'failed', writable: true});
      self._updateConnectionState();
    };

    return {
      iceTransport: iceTransport,
      dtlsTransport: dtlsTransport
    };
  };

  // Destroy ICE gatherer, ICE transport and DTLS transport.
  // Without triggering the callbacks.
  RTCPeerConnection.prototype._disposeIceAndDtlsTransports = function(
      sdpMLineIndex) {
    var iceGatherer = this.transceivers[sdpMLineIndex].iceGatherer;
    if (iceGatherer) {
      delete iceGatherer.onlocalcandidate;
      delete this.transceivers[sdpMLineIndex].iceGatherer;
    }
    var iceTransport = this.transceivers[sdpMLineIndex].iceTransport;
    if (iceTransport) {
      delete iceTransport.onicestatechange;
      delete this.transceivers[sdpMLineIndex].iceTransport;
    }
    var dtlsTransport = this.transceivers[sdpMLineIndex].dtlsTransport;
    if (dtlsTransport) {
      delete dtlsTransport.ondtlssttatechange;
      delete dtlsTransport.onerror;
      delete this.transceivers[sdpMLineIndex].dtlsTransport;
    }
  };

  // Start the RTP Sender and Receiver for a transceiver.
  RTCPeerConnection.prototype._transceive = function(transceiver,
      send, recv) {
    var params = getCommonCapabilities(transceiver.localCapabilities,
        transceiver.remoteCapabilities);
    if (send && transceiver.rtpSender) {
      params.encodings = transceiver.sendEncodingParameters;
      params.rtcp = {
        cname: SDPUtils.localCName,
        compound: transceiver.rtcpParameters.compound
      };
      if (transceiver.recvEncodingParameters.length) {
        params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
      }
      transceiver.rtpSender.send(params);
    }
    if (recv && transceiver.rtpReceiver) {
      // remove RTX field in Edge 14942
      if (transceiver.kind === 'video'
          && transceiver.recvEncodingParameters
          && edgeVersion < 15019) {
        transceiver.recvEncodingParameters.forEach(function(p) {
          delete p.rtx;
        });
      }
      params.encodings = transceiver.recvEncodingParameters;
      params.rtcp = {
        cname: transceiver.rtcpParameters.cname,
        compound: transceiver.rtcpParameters.compound
      };
      if (transceiver.sendEncodingParameters.length) {
        params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
      }
      transceiver.rtpReceiver.receive(params);
    }
  };

  RTCPeerConnection.prototype.setLocalDescription = function(description) {
    var self = this;

    if (!isActionAllowedInSignalingState('setLocalDescription',
        description.type, this.signalingState)) {
      var e = new Error('Can not set local ' + description.type +
          ' in state ' + this.signalingState);
      e.name = 'InvalidStateError';
      if (arguments.length > 2 && typeof arguments[2] === 'function') {
        window.setTimeout(arguments[2], 0, e);
      }
      return Promise.reject(e);
    }

    var sections;
    var sessionpart;
    if (description.type === 'offer') {
      // FIXME: What was the purpose of this empty if statement?
      // if (!this._pendingOffer) {
      // } else {
      if (this._pendingOffer) {
        // VERY limited support for SDP munging. Limited to:
        // * changing the order of codecs
        sections = SDPUtils.splitSections(description.sdp);
        sessionpart = sections.shift();
        sections.forEach(function(mediaSection, sdpMLineIndex) {
          var caps = SDPUtils.parseRtpParameters(mediaSection);
          self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
        });
        this.transceivers = this._pendingOffer;
        delete this._pendingOffer;
      }
    } else if (description.type === 'answer') {
      sections = SDPUtils.splitSections(self.remoteDescription.sdp);
      sessionpart = sections.shift();
      var isIceLite = SDPUtils.matchPrefix(sessionpart,
          'a=ice-lite').length > 0;
      sections.forEach(function(mediaSection, sdpMLineIndex) {
        var transceiver = self.transceivers[sdpMLineIndex];
        var iceGatherer = transceiver.iceGatherer;
        var iceTransport = transceiver.iceTransport;
        var dtlsTransport = transceiver.dtlsTransport;
        var localCapabilities = transceiver.localCapabilities;
        var remoteCapabilities = transceiver.remoteCapabilities;

        var rejected = SDPUtils.isRejected(mediaSection);

        if (!rejected && !transceiver.isDatachannel) {
          var remoteIceParameters = SDPUtils.getIceParameters(
              mediaSection, sessionpart);
          var remoteDtlsParameters = SDPUtils.getDtlsParameters(
              mediaSection, sessionpart);
          if (isIceLite) {
            remoteDtlsParameters.role = 'server';
          }

          if (!self.usingBundle || sdpMLineIndex === 0) {
            iceTransport.start(iceGatherer, remoteIceParameters,
                isIceLite ? 'controlling' : 'controlled');
            dtlsTransport.start(remoteDtlsParameters);
          }

          // Calculate intersection of capabilities.
          var params = getCommonCapabilities(localCapabilities,
              remoteCapabilities);

          // Start the RTCRtpSender. The RTCRtpReceiver for this
          // transceiver has already been started in setRemoteDescription.
          self._transceive(transceiver,
              params.codecs.length > 0,
              false);
        }
      });
    }

    this.localDescription = {
      type: description.type,
      sdp: description.sdp
    };
    switch (description.type) {
      case 'offer':
        this._updateSignalingState('have-local-offer');
        break;
      case 'answer':
        this._updateSignalingState('stable');
        break;
      default:
        throw new TypeError('unsupported type "' + description.type +
            '"');
    }

    // If a success callback was provided, emit ICE candidates after it
    // has been executed. Otherwise, emit callback after the Promise is
    // resolved.
    var hasCallback = arguments.length > 1 &&
      typeof arguments[1] === 'function';
    if (hasCallback) {
      var cb = arguments[1];
      window.setTimeout(function() {
        cb();
        if (self.iceGatheringState === 'new') {
          self.iceGatheringState = 'gathering';
          self._emitGatheringStateChange();
        }
        self._emitBufferedCandidates();
      }, 0);
    }
    var p = Promise.resolve();
    p.then(function() {
      if (!hasCallback) {
        if (self.iceGatheringState === 'new') {
          self.iceGatheringState = 'gathering';
          self._emitGatheringStateChange();
        }
        // Usually candidates will be emitted earlier.
        window.setTimeout(self._emitBufferedCandidates.bind(self), 500);
      }
    });
    return p;
  };

  RTCPeerConnection.prototype.setRemoteDescription = function(description) {
    var self = this;

    if (!isActionAllowedInSignalingState('setRemoteDescription',
        description.type, this.signalingState)) {
      var e = new Error('Can not set remote ' + description.type +
          ' in state ' + this.signalingState);
      e.name = 'InvalidStateError';
      if (arguments.length > 2 && typeof arguments[2] === 'function') {
        window.setTimeout(arguments[2], 0, e);
      }
      return Promise.reject(e);
    }

    var streams = {};
    var receiverList = [];
    var sections = SDPUtils.splitSections(description.sdp);
    var sessionpart = sections.shift();
    var isIceLite = SDPUtils.matchPrefix(sessionpart,
        'a=ice-lite').length > 0;
    var usingBundle = SDPUtils.matchPrefix(sessionpart,
        'a=group:BUNDLE ').length > 0;
    this.usingBundle = usingBundle;
    var iceOptions = SDPUtils.matchPrefix(sessionpart,
        'a=ice-options:')[0];
    if (iceOptions) {
      this.canTrickleIceCandidates = iceOptions.substr(14).split(' ')
          .indexOf('trickle') >= 0;
    } else {
      this.canTrickleIceCandidates = false;
    }

    sections.forEach(function(mediaSection, sdpMLineIndex) {
      var lines = SDPUtils.splitLines(mediaSection);
      var kind = SDPUtils.getKind(mediaSection);
      var rejected = SDPUtils.isRejected(mediaSection);
      var protocol = lines[0].substr(2).split(' ')[2];

      var direction = SDPUtils.getDirection(mediaSection, sessionpart);
      var remoteMsid = SDPUtils.parseMsid(mediaSection);

      var mid = SDPUtils.getMid(mediaSection) || SDPUtils.generateIdentifier();

      // Reject datachannels which are not implemented yet.
      if (kind === 'application' && protocol === 'DTLS/SCTP') {
        self.transceivers[sdpMLineIndex] = {
          mid: mid,
          isDatachannel: true
        };
        return;
      }

      var transceiver;
      var iceGatherer;
      var iceTransport;
      var dtlsTransport;
      var rtpReceiver;
      var sendEncodingParameters;
      var recvEncodingParameters;
      var localCapabilities;

      var track;
      // FIXME: ensure the mediaSection has rtcp-mux set.
      var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
      var remoteIceParameters;
      var remoteDtlsParameters;
      if (!rejected) {
        remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
            sessionpart);
        remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
            sessionpart);
        remoteDtlsParameters.role = 'client';
      }
      recvEncodingParameters =
          SDPUtils.parseRtpEncodingParameters(mediaSection);

      var rtcpParameters = SDPUtils.parseRtcpParameters(mediaSection);

      var isComplete = SDPUtils.matchPrefix(mediaSection,
          'a=end-of-candidates', sessionpart).length > 0;
      var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
          .map(function(cand) {
            return SDPUtils.parseCandidate(cand);
          })
          .filter(function(cand) {
            return cand.component === '1' || cand.component === 1;
          });

      // Check if we can use BUNDLE and dispose transports.
      if ((description.type === 'offer' || description.type === 'answer') &&
          !rejected && usingBundle && sdpMLineIndex > 0 &&
          self.transceivers[sdpMLineIndex]) {
        self._disposeIceAndDtlsTransports(sdpMLineIndex);
        self.transceivers[sdpMLineIndex].iceGatherer =
            self.transceivers[0].iceGatherer;
        self.transceivers[sdpMLineIndex].iceTransport =
            self.transceivers[0].iceTransport;
        self.transceivers[sdpMLineIndex].dtlsTransport =
            self.transceivers[0].dtlsTransport;
        if (self.transceivers[sdpMLineIndex].rtpSender) {
          self.transceivers[sdpMLineIndex].rtpSender.setTransport(
              self.transceivers[0].dtlsTransport);
        }
        if (self.transceivers[sdpMLineIndex].rtpReceiver) {
          self.transceivers[sdpMLineIndex].rtpReceiver.setTransport(
              self.transceivers[0].dtlsTransport);
        }
      }
      if (description.type === 'offer' && !rejected) {
        transceiver = self.transceivers[sdpMLineIndex] ||
            self._createTransceiver(kind);
        transceiver.mid = mid;

        if (!transceiver.iceGatherer) {
          transceiver.iceGatherer = usingBundle && sdpMLineIndex > 0 ?
              self.transceivers[0].iceGatherer :
              self._createIceGatherer(mid, sdpMLineIndex);
        }

        if (isComplete && (!usingBundle || sdpMLineIndex === 0)) {
          transceiver.iceTransport.setRemoteCandidates(cands);
        }

        localCapabilities = window.RTCRtpReceiver.getCapabilities(kind);

        // filter RTX until additional stuff needed for RTX is implemented
        // in adapter.js
        if (edgeVersion < 15019) {
          localCapabilities.codecs = localCapabilities.codecs.filter(
              function(codec) {
                return codec.name !== 'rtx';
              });
        }

        sendEncodingParameters = [{
          ssrc: (2 * sdpMLineIndex + 2) * 1001
        }];

        if (direction === 'sendrecv' || direction === 'sendonly') {
          rtpReceiver = new window.RTCRtpReceiver(transceiver.dtlsTransport,
              kind);

          track = rtpReceiver.track;
          // FIXME: does not work with Plan B.
          if (remoteMsid) {
            if (!streams[remoteMsid.stream]) {
              streams[remoteMsid.stream] = new window.MediaStream();
              Object.defineProperty(streams[remoteMsid.stream], 'id', {
                get: function() {
                  return remoteMsid.stream;
                }
              });
            }
            Object.defineProperty(track, 'id', {
              get: function() {
                return remoteMsid.track;
              }
            });
            streams[remoteMsid.stream].addTrack(track);
            receiverList.push([track, rtpReceiver,
              streams[remoteMsid.stream]]);
          } else {
            if (!streams.default) {
              streams.default = new window.MediaStream();
            }
            streams.default.addTrack(track);
            receiverList.push([track, rtpReceiver, streams.default]);
          }
        }

        transceiver.localCapabilities = localCapabilities;
        transceiver.remoteCapabilities = remoteCapabilities;
        transceiver.rtpReceiver = rtpReceiver;
        transceiver.rtcpParameters = rtcpParameters;
        transceiver.sendEncodingParameters = sendEncodingParameters;
        transceiver.recvEncodingParameters = recvEncodingParameters;

        // Start the RTCRtpReceiver now. The RTPSender is started in
        // setLocalDescription.
        self._transceive(self.transceivers[sdpMLineIndex],
            false,
            direction === 'sendrecv' || direction === 'sendonly');
      } else if (description.type === 'answer' && !rejected) {
        transceiver = self.transceivers[sdpMLineIndex];
        iceGatherer = transceiver.iceGatherer;
        iceTransport = transceiver.iceTransport;
        dtlsTransport = transceiver.dtlsTransport;
        rtpReceiver = transceiver.rtpReceiver;
        sendEncodingParameters = transceiver.sendEncodingParameters;
        localCapabilities = transceiver.localCapabilities;

        self.transceivers[sdpMLineIndex].recvEncodingParameters =
            recvEncodingParameters;
        self.transceivers[sdpMLineIndex].remoteCapabilities =
            remoteCapabilities;
        self.transceivers[sdpMLineIndex].rtcpParameters = rtcpParameters;

        if ((isIceLite || isComplete) && cands.length) {
          iceTransport.setRemoteCandidates(cands);
        }
        if (!usingBundle || sdpMLineIndex === 0) {
          iceTransport.start(iceGatherer, remoteIceParameters,
              'controlling');
          dtlsTransport.start(remoteDtlsParameters);
        }

        self._transceive(transceiver,
            direction === 'sendrecv' || direction === 'recvonly',
            direction === 'sendrecv' || direction === 'sendonly');

        if (rtpReceiver &&
            (direction === 'sendrecv' || direction === 'sendonly')) {
          track = rtpReceiver.track;
          if (remoteMsid) {
            if (!streams[remoteMsid.stream]) {
              streams[remoteMsid.stream] = new window.MediaStream();
            }
            streams[remoteMsid.stream].addTrack(track);
            receiverList.push([track, rtpReceiver, streams[remoteMsid.stream]]);
          } else {
            if (!streams.default) {
              streams.default = new window.MediaStream();
            }
            streams.default.addTrack(track);
            receiverList.push([track, rtpReceiver, streams.default]);
          }
        } else {
          // FIXME: actually the receiver should be created later.
          delete transceiver.rtpReceiver;
        }
      }
    });

    this.remoteDescription = {
      type: description.type,
      sdp: description.sdp
    };
    switch (description.type) {
      case 'offer':
        this._updateSignalingState('have-remote-offer');
        break;
      case 'answer':
        this._updateSignalingState('stable');
        break;
      default:
        throw new TypeError('unsupported type "' + description.type +
            '"');
    }
    Object.keys(streams).forEach(function(sid) {
      var stream = streams[sid];
      if (stream.getTracks().length) {
        self.remoteStreams.push(stream);
        var event = new Event('addstream');
        event.stream = stream;
        self.dispatchEvent(event);
        if (self.onaddstream !== null) {
          window.setTimeout(function() {
            self.onaddstream(event);
          }, 0);
        }

        receiverList.forEach(function(item) {
          var track = item[0];
          var receiver = item[1];
          if (stream.id !== item[2].id) {
            return;
          }
          var trackEvent = new Event('track');
          trackEvent.track = track;
          trackEvent.receiver = receiver;
          trackEvent.streams = [stream];
          self.dispatchEvent(trackEvent);
          if (self.ontrack !== null) {
            window.setTimeout(function() {
              self.ontrack(trackEvent);
            }, 0);
          }
        });
      }
    });

    // check whether addIceCandidate({}) was called within four seconds after
    // setRemoteDescription.
    window.setTimeout(function() {
      if (!(self && self.transceivers)) {
        return;
      }
      self.transceivers.forEach(function(transceiver) {
        if (transceiver.iceTransport &&
            transceiver.iceTransport.state === 'new' &&
            transceiver.iceTransport.getRemoteCandidates().length > 0) {
          console.warn('Timeout for addRemoteCandidate. Consider sending ' +
              'an end-of-candidates notification');
          transceiver.iceTransport.addRemoteCandidate({});
        }
      });
    }, 4000);

    if (arguments.length > 1 && typeof arguments[1] === 'function') {
      window.setTimeout(arguments[1], 0);
    }
    return Promise.resolve();
  };

  RTCPeerConnection.prototype.close = function() {
    this.transceivers.forEach(function(transceiver) {
      /* not yet
      if (transceiver.iceGatherer) {
        transceiver.iceGatherer.close();
      }
      */
      if (transceiver.iceTransport) {
        transceiver.iceTransport.stop();
      }
      if (transceiver.dtlsTransport) {
        transceiver.dtlsTransport.stop();
      }
      if (transceiver.rtpSender) {
        transceiver.rtpSender.stop();
      }
      if (transceiver.rtpReceiver) {
        transceiver.rtpReceiver.stop();
      }
    });
    // FIXME: clean up tracks, local streams, remote streams, etc
    this._updateSignalingState('closed');
  };

  // Update the signaling state.
  RTCPeerConnection.prototype._updateSignalingState = function(newState) {
    this.signalingState = newState;
    var event = new Event('signalingstatechange');
    this.dispatchEvent(event);
    if (this.onsignalingstatechange !== null) {
      this.onsignalingstatechange(event);
    }
  };

  // Determine whether to fire the negotiationneeded event.
  RTCPeerConnection.prototype._maybeFireNegotiationNeeded = function() {
    var self = this;
    if (this.signalingState !== 'stable' || this.needNegotiation === true) {
      return;
    }
    this.needNegotiation = true;
    window.setTimeout(function() {
      if (self.needNegotiation === false) {
        return;
      }
      self.needNegotiation = false;
      var event = new Event('negotiationneeded');
      self.dispatchEvent(event);
      if (self.onnegotiationneeded !== null) {
        self.onnegotiationneeded(event);
      }
    }, 0);
  };

  // Update the connection state.
  RTCPeerConnection.prototype._updateConnectionState = function() {
    var self = this;
    var newState;
    var states = {
      'new': 0,
      closed: 0,
      connecting: 0,
      checking: 0,
      connected: 0,
      completed: 0,
      disconnected: 0,
      failed: 0
    };
    this.transceivers.forEach(function(transceiver) {
      states[transceiver.iceTransport.state]++;
      states[transceiver.dtlsTransport.state]++;
    });
    // ICETransport.completed and connected are the same for this purpose.
    states.connected += states.completed;

    newState = 'new';
    if (states.failed > 0) {
      newState = 'failed';
    } else if (states.connecting > 0 || states.checking > 0) {
      newState = 'connecting';
    } else if (states.disconnected > 0) {
      newState = 'disconnected';
    } else if (states.new > 0) {
      newState = 'new';
    } else if (states.connected > 0 || states.completed > 0) {
      newState = 'connected';
    }

    if (newState !== self.iceConnectionState) {
      self.iceConnectionState = newState;
      var event = new Event('iceconnectionstatechange');
      this.dispatchEvent(event);
      if (this.oniceconnectionstatechange !== null) {
        this.oniceconnectionstatechange(event);
      }
    }
  };

  RTCPeerConnection.prototype.createOffer = function() {
    var self = this;
    if (this._pendingOffer) {
      throw new Error('createOffer called while there is a pending offer.');
    }
    var offerOptions;
    if (arguments.length === 1 && typeof arguments[0] !== 'function') {
      offerOptions = arguments[0];
    } else if (arguments.length === 3) {
      offerOptions = arguments[2];
    }

    var numAudioTracks = this.transceivers.filter(function(t) {
      return t.kind === 'audio';
    }).length;
    var numVideoTracks = this.transceivers.filter(function(t) {
      return t.kind === 'video';
    }).length;

    // Determine number of audio and video tracks we need to send/recv.
    if (offerOptions) {
      // Reject Chrome legacy constraints.
      if (offerOptions.mandatory || offerOptions.optional) {
        throw new TypeError(
            'Legacy mandatory/optional constraints not supported.');
      }
      if (offerOptions.offerToReceiveAudio !== undefined) {
        if (offerOptions.offerToReceiveAudio === true) {
          numAudioTracks = 1;
        } else if (offerOptions.offerToReceiveAudio === false) {
          numAudioTracks = 0;
        } else {
          numAudioTracks = offerOptions.offerToReceiveAudio;
        }
      }
      if (offerOptions.offerToReceiveVideo !== undefined) {
        if (offerOptions.offerToReceiveVideo === true) {
          numVideoTracks = 1;
        } else if (offerOptions.offerToReceiveVideo === false) {
          numVideoTracks = 0;
        } else {
          numVideoTracks = offerOptions.offerToReceiveVideo;
        }
      }
    }

    this.transceivers.forEach(function(transceiver) {
      if (transceiver.kind === 'audio') {
        numAudioTracks--;
        if (numAudioTracks < 0) {
          transceiver.wantReceive = false;
        }
      } else if (transceiver.kind === 'video') {
        numVideoTracks--;
        if (numVideoTracks < 0) {
          transceiver.wantReceive = false;
        }
      }
    });

    // Create M-lines for recvonly streams.
    while (numAudioTracks > 0 || numVideoTracks > 0) {
      if (numAudioTracks > 0) {
        this._createTransceiver('audio');
        numAudioTracks--;
      }
      if (numVideoTracks > 0) {
        this._createTransceiver('video');
        numVideoTracks--;
      }
    }
    // reorder tracks
    var transceivers = sortTracks(this.transceivers);

    var sdp = SDPUtils.writeSessionBoilerplate();
    transceivers.forEach(function(transceiver, sdpMLineIndex) {
      // For each track, create an ice gatherer, ice transport,
      // dtls transport, potentially rtpsender and rtpreceiver.
      var track = transceiver.track;
      var kind = transceiver.kind;
      var mid = SDPUtils.generateIdentifier();
      transceiver.mid = mid;

      if (!transceiver.iceGatherer) {
        transceiver.iceGatherer = self.usingBundle && sdpMLineIndex > 0 ?
            transceivers[0].iceGatherer :
            self._createIceGatherer(mid, sdpMLineIndex);
      }

      var localCapabilities = window.RTCRtpSender.getCapabilities(kind);
      // filter RTX until additional stuff needed for RTX is implemented
      // in adapter.js
      if (edgeVersion < 15019) {
        localCapabilities.codecs = localCapabilities.codecs.filter(
            function(codec) {
              return codec.name !== 'rtx';
            });
      }
      localCapabilities.codecs.forEach(function(codec) {
        // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
        // by adding level-asymmetry-allowed=1
        if (codec.name === 'H264' &&
            codec.parameters['level-asymmetry-allowed'] === undefined) {
          codec.parameters['level-asymmetry-allowed'] = '1';
        }
      });

      // generate an ssrc now, to be used later in rtpSender.send
      var sendEncodingParameters = [{
        ssrc: (2 * sdpMLineIndex + 1) * 1001
      }];
      if (track) {
        // add RTX
        if (edgeVersion >= 15019 && kind === 'video') {
          sendEncodingParameters[0].rtx = {
            ssrc: (2 * sdpMLineIndex + 1) * 1001 + 1
          };
        }
      }

      if (transceiver.wantReceive) {
        transceiver.rtpReceiver = new window.RTCRtpReceiver(
          transceiver.dtlsTransport,
          kind
        );
      }

      transceiver.localCapabilities = localCapabilities;
      transceiver.sendEncodingParameters = sendEncodingParameters;
    });

    // always offer BUNDLE and dispose on return if not supported.
    if (this._config.bundlePolicy !== 'max-compat') {
      sdp += 'a=group:BUNDLE ' + transceivers.map(function(t) {
        return t.mid;
      }).join(' ') + '\r\n';
    }
    sdp += 'a=ice-options:trickle\r\n';

    transceivers.forEach(function(transceiver, sdpMLineIndex) {
      sdp += SDPUtils.writeMediaSection(transceiver,
          transceiver.localCapabilities, 'offer', transceiver.stream);
      sdp += 'a=rtcp-rsize\r\n';
    });

    this._pendingOffer = transceivers;
    var desc = new window.RTCSessionDescription({
      type: 'offer',
      sdp: sdp
    });
    if (arguments.length && typeof arguments[0] === 'function') {
      window.setTimeout(arguments[0], 0, desc);
    }
    return Promise.resolve(desc);
  };

  RTCPeerConnection.prototype.createAnswer = function() {
    var sdp = SDPUtils.writeSessionBoilerplate();
    if (this.usingBundle) {
      sdp += 'a=group:BUNDLE ' + this.transceivers.map(function(t) {
        return t.mid;
      }).join(' ') + '\r\n';
    }
    this.transceivers.forEach(function(transceiver, sdpMLineIndex) {
      if (transceiver.isDatachannel) {
        sdp += 'm=application 0 DTLS/SCTP 5000\r\n' +
            'c=IN IP4 0.0.0.0\r\n' +
            'a=mid:' + transceiver.mid + '\r\n';
        return;
      }

      // FIXME: look at direction.
      if (transceiver.stream) {
        var localTrack;
        if (transceiver.kind === 'audio') {
          localTrack = transceiver.stream.getAudioTracks()[0];
        } else if (transceiver.kind === 'video') {
          localTrack = transceiver.stream.getVideoTracks()[0];
        }
        if (localTrack) {
          // add RTX
          if (edgeVersion >= 15019 && transceiver.kind === 'video') {
            transceiver.sendEncodingParameters[0].rtx = {
              ssrc: (2 * sdpMLineIndex + 2) * 1001 + 1
            };
          }
        }
      }

      // Calculate intersection of capabilities.
      var commonCapabilities = getCommonCapabilities(
          transceiver.localCapabilities,
          transceiver.remoteCapabilities);

      var hasRtx = commonCapabilities.codecs.filter(function(c) {
        return c.name.toLowerCase() === 'rtx';
      }).length;
      if (!hasRtx && transceiver.sendEncodingParameters[0].rtx) {
        delete transceiver.sendEncodingParameters[0].rtx;
      }

      sdp += SDPUtils.writeMediaSection(transceiver, commonCapabilities,
          'answer', transceiver.stream);
      if (transceiver.rtcpParameters &&
          transceiver.rtcpParameters.reducedSize) {
        sdp += 'a=rtcp-rsize\r\n';
      }
    });

    var desc = new window.RTCSessionDescription({
      type: 'answer',
      sdp: sdp
    });
    if (arguments.length && typeof arguments[0] === 'function') {
      window.setTimeout(arguments[0], 0, desc);
    }
    return Promise.resolve(desc);
  };

  RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
    if (!candidate) {
      for (var j = 0; j < this.transceivers.length; j++) {
        this.transceivers[j].iceTransport.addRemoteCandidate({});
        if (this.usingBundle) {
          return Promise.resolve();
        }
      }
    } else {
      var mLineIndex = candidate.sdpMLineIndex;
      if (candidate.sdpMid) {
        for (var i = 0; i < this.transceivers.length; i++) {
          if (this.transceivers[i].mid === candidate.sdpMid) {
            mLineIndex = i;
            break;
          }
        }
      }
      var transceiver = this.transceivers[mLineIndex];
      if (transceiver) {
        var cand = Object.keys(candidate.candidate).length > 0 ?
            SDPUtils.parseCandidate(candidate.candidate) : {};
        // Ignore Chrome's invalid candidates since Edge does not like them.
        if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
          return Promise.resolve();
        }
        // Ignore RTCP candidates, we assume RTCP-MUX.
        if (cand.component &&
            !(cand.component === '1' || cand.component === 1)) {
          return Promise.resolve();
        }
        transceiver.iceTransport.addRemoteCandidate(cand);

        // update the remoteDescription.
        var sections = SDPUtils.splitSections(this.remoteDescription.sdp);
        sections[mLineIndex + 1] += (cand.type ? candidate.candidate.trim()
            : 'a=end-of-candidates') + '\r\n';
        this.remoteDescription.sdp = sections.join('');
      }
    }
    if (arguments.length > 1 && typeof arguments[1] === 'function') {
      window.setTimeout(arguments[1], 0);
    }
    return Promise.resolve();
  };

  RTCPeerConnection.prototype.getStats = function() {
    var promises = [];
    this.transceivers.forEach(function(transceiver) {
      ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
        'dtlsTransport'].forEach(function(method) {
          if (transceiver[method]) {
            promises.push(transceiver[method].getStats());
          }
        });
    });
    var cb = arguments.length > 1 && typeof arguments[1] === 'function' &&
        arguments[1];
    var fixStatsType = function(stat) {
      return {
        inboundrtp: 'inbound-rtp',
        outboundrtp: 'outbound-rtp',
        candidatepair: 'candidate-pair',
        localcandidate: 'local-candidate',
        remotecandidate: 'remote-candidate'
      }[stat.type] || stat.type;
    };
    return new Promise(function(resolve) {
      // shim getStats with maplike support
      var results = new Map();
      Promise.all(promises).then(function(res) {
        res.forEach(function(result) {
          Object.keys(result).forEach(function(id) {
            result[id].type = fixStatsType(result[id]);
            results.set(id, result[id]);
          });
        });
        if (cb) {
          window.setTimeout(cb, 0, results);
        }
        resolve(results);
      });
    });
  };
  return RTCPeerConnection;
};

},{"sdp":1}],9:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var utils = require('../utils');

var firefoxShim = {
  shimOnTrack: function(window) {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', this._ontrackpoly = function(e) {
            e.stream.getTracks().forEach(function(track) {
              var event = new Event('track');
              event.track = track;
              event.receiver = {track: track};
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimSourceObject: function(window) {
    // Firefox has supported mozSrcObject since FF22, unprefixed in 42.
    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this.mozSrcObject;
          },
          set: function(stream) {
            this.mozSrcObject = stream;
          }
        });
      }
    }
  },

  shimPeerConnection: function(window) {
    var browserDetails = utils.detectBrowser(window);

    if (typeof window !== 'object' || !(window.RTCPeerConnection ||
        window.mozRTCPeerConnection)) {
      return; // probably media.peerconnection.enabled=false in about:config
    }
    // The RTCPeerConnection object.
    if (!window.RTCPeerConnection) {
      window.RTCPeerConnection = function(pcConfig, pcConstraints) {
        if (browserDetails.version < 38) {
          // .urls is not supported in FF < 38.
          // create RTCIceServers with a single url.
          if (pcConfig && pcConfig.iceServers) {
            var newIceServers = [];
            for (var i = 0; i < pcConfig.iceServers.length; i++) {
              var server = pcConfig.iceServers[i];
              if (server.hasOwnProperty('urls')) {
                for (var j = 0; j < server.urls.length; j++) {
                  var newServer = {
                    url: server.urls[j]
                  };
                  if (server.urls[j].indexOf('turn') === 0) {
                    newServer.username = server.username;
                    newServer.credential = server.credential;
                  }
                  newIceServers.push(newServer);
                }
              } else {
                newIceServers.push(pcConfig.iceServers[i]);
              }
            }
            pcConfig.iceServers = newIceServers;
          }
        }
        return new window.mozRTCPeerConnection(pcConfig, pcConstraints);
      };
      window.RTCPeerConnection.prototype =
          window.mozRTCPeerConnection.prototype;

      // wrap static methods. Currently just generateCertificate.
      if (window.mozRTCPeerConnection.generateCertificate) {
        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
          get: function() {
            return window.mozRTCPeerConnection.generateCertificate;
          }
        });
      }

      window.RTCSessionDescription = window.mozRTCSessionDescription;
      window.RTCIceCandidate = window.mozRTCIceCandidate;
    }

    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = window.RTCPeerConnection.prototype[method];
          window.RTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                window.RTCIceCandidate :
                window.RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null or undefined)
    var nativeAddIceCandidate =
        window.RTCPeerConnection.prototype.addIceCandidate;
    window.RTCPeerConnection.prototype.addIceCandidate = function() {
      if (!arguments[0]) {
        if (arguments[1]) {
          arguments[1].apply(null);
        }
        return Promise.resolve();
      }
      return nativeAddIceCandidate.apply(this, arguments);
    };

    // shim getStats with maplike support
    var makeMapStats = function(stats) {
      var map = new Map();
      Object.keys(stats).forEach(function(key) {
        map.set(key, stats[key]);
        map[key] = stats[key];
      });
      return map;
    };

    var modernStatsTypes = {
      inboundrtp: 'inbound-rtp',
      outboundrtp: 'outbound-rtp',
      candidatepair: 'candidate-pair',
      localcandidate: 'local-candidate',
      remotecandidate: 'remote-candidate'
    };

    var nativeGetStats = window.RTCPeerConnection.prototype.getStats;
    window.RTCPeerConnection.prototype.getStats = function(
      selector,
      onSucc,
      onErr
    ) {
      return nativeGetStats.apply(this, [selector || null])
        .then(function(stats) {
          if (browserDetails.version < 48) {
            stats = makeMapStats(stats);
          }
          if (browserDetails.version < 53 && !onSucc) {
            // Shim only promise getStats with spec-hyphens in type names
            // Leave callback version alone; misc old uses of forEach before Map
            try {
              stats.forEach(function(stat) {
                stat.type = modernStatsTypes[stat.type] || stat.type;
              });
            } catch (e) {
              if (e.name !== 'TypeError') {
                throw e;
              }
              // Avoid TypeError: "type" is read-only, in old versions. 34-43ish
              stats.forEach(function(stat, i) {
                stats.set(i, Object.assign({}, stat, {
                  type: modernStatsTypes[stat.type] || stat.type
                }));
              });
            }
          }
          return stats;
        })
        .then(onSucc, onErr);
    };
  }
};

// Expose public methods.
module.exports = {
  shimOnTrack: firefoxShim.shimOnTrack,
  shimSourceObject: firefoxShim.shimSourceObject,
  shimPeerConnection: firefoxShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils":12,"./getusermedia":10}],10:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var utils = require('../utils');
var logging = utils.log;

// Expose public methods.
module.exports = function(window) {
  var browserDetails = utils.detectBrowser(window);
  var navigator = window && window.navigator;
  var MediaStreamTrack = window && window.MediaStreamTrack;

  var shimError_ = function(e) {
    return {
      name: {
        InternalError: 'NotReadableError',
        NotSupportedError: 'TypeError',
        PermissionDeniedError: 'NotAllowedError',
        SecurityError: 'NotAllowedError'
      }[e.name] || e.name,
      message: {
        'The operation is insecure.': 'The request is not allowed by the ' +
        'user agent or the platform in the current context.'
      }[e.message] || e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  // getUserMedia constraints shim.
  var getUserMedia_ = function(constraints, onSuccess, onError) {
    var constraintsToFF37_ = function(c) {
      if (typeof c !== 'object' || c.require) {
        return c;
      }
      var require = [];
      Object.keys(c).forEach(function(key) {
        if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
          return;
        }
        var r = c[key] = (typeof c[key] === 'object') ?
            c[key] : {ideal: c[key]};
        if (r.min !== undefined ||
            r.max !== undefined || r.exact !== undefined) {
          require.push(key);
        }
        if (r.exact !== undefined) {
          if (typeof r.exact === 'number') {
            r. min = r.max = r.exact;
          } else {
            c[key] = r.exact;
          }
          delete r.exact;
        }
        if (r.ideal !== undefined) {
          c.advanced = c.advanced || [];
          var oc = {};
          if (typeof r.ideal === 'number') {
            oc[key] = {min: r.ideal, max: r.ideal};
          } else {
            oc[key] = r.ideal;
          }
          c.advanced.push(oc);
          delete r.ideal;
          if (!Object.keys(r).length) {
            delete c[key];
          }
        }
      });
      if (require.length) {
        c.require = require;
      }
      return c;
    };
    constraints = JSON.parse(JSON.stringify(constraints));
    if (browserDetails.version < 38) {
      logging('spec: ' + JSON.stringify(constraints));
      if (constraints.audio) {
        constraints.audio = constraintsToFF37_(constraints.audio);
      }
      if (constraints.video) {
        constraints.video = constraintsToFF37_(constraints.video);
      }
      logging('ff37: ' + JSON.stringify(constraints));
    }
    return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {
      onError(shimError_(e));
    });
  };

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      getUserMedia_(constraints, resolve, reject);
    });
  };

  // Shim for mediaDevices on older versions.
  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,
      addEventListener: function() { },
      removeEventListener: function() { }
    };
  }
  navigator.mediaDevices.enumerateDevices =
      navigator.mediaDevices.enumerateDevices || function() {
        return new Promise(function(resolve) {
          var infos = [
            {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},
            {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}
          ];
          resolve(infos);
        });
      };

  if (browserDetails.version < 41) {
    // Work around http://bugzil.la/1169665
    var orgEnumerateDevices =
        navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);
    navigator.mediaDevices.enumerateDevices = function() {
      return orgEnumerateDevices().then(undefined, function(e) {
        if (e.name === 'NotFoundError') {
          return [];
        }
        throw e;
      });
    };
  }
  if (browserDetails.version < 49) {
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(c) {
      return origGetUserMedia(c).then(function(stream) {
        // Work around https://bugzil.la/802326
        if (c.audio && !stream.getAudioTracks().length ||
            c.video && !stream.getVideoTracks().length) {
          stream.getTracks().forEach(function(track) {
            track.stop();
          });
          throw new DOMException('The object can not be found here.',
                                 'NotFoundError');
        }
        return stream;
      }, function(e) {
        return Promise.reject(shimError_(e));
      });
    };
  }
  if (!(browserDetails.version > 55 &&
      'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
    var remap = function(obj, a, b) {
      if (a in obj && !(b in obj)) {
        obj[b] = obj[a];
        delete obj[a];
      }
    };

    var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(c) {
      if (typeof c === 'object' && typeof c.audio === 'object') {
        c = JSON.parse(JSON.stringify(c));
        remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
        remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
      }
      return nativeGetUserMedia(c);
    };

    if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
      var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
      MediaStreamTrack.prototype.getSettings = function() {
        var obj = nativeGetSettings.apply(this, arguments);
        remap(obj, 'mozAutoGainControl', 'autoGainControl');
        remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
        return obj;
      };
    }

    if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
      var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
      MediaStreamTrack.prototype.applyConstraints = function(c) {
        if (this.kind === 'audio' && typeof c === 'object') {
          c = JSON.parse(JSON.stringify(c));
          remap(c, 'autoGainControl', 'mozAutoGainControl');
          remap(c, 'noiseSuppression', 'mozNoiseSuppression');
        }
        return nativeApplyConstraints.apply(this, [c]);
      };
    }
  }
  navigator.getUserMedia = function(constraints, onSuccess, onError) {
    if (browserDetails.version < 44) {
      return getUserMedia_(constraints, onSuccess, onError);
    }
    // Replace Firefox 44+'s deprecation warning with unprefixed version.
    console.warn('navigator.getUserMedia has been replaced by ' +
                 'navigator.mediaDevices.getUserMedia');
    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
  };
};

},{"../utils":12}],11:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
'use strict';
var safariShim = {
  // TODO: DrAlex, should be here, double check against LayoutTests

  // TODO: once the back-end for the mac port is done, add.
  // TODO: check for webkitGTK+
  // shimPeerConnection: function() { },

  shimAddStream: function(window) {
    if (typeof window === 'object' && window.RTCPeerConnection &&
        !('addStream' in window.RTCPeerConnection.prototype)) {
      window.RTCPeerConnection.prototype.addStream = function(stream) {
        var self = this;
        stream.getTracks().forEach(function(track) {
          self.addTrack(track, stream);
        });
      };
    }
  },
  shimOnAddStream: function(window) {
    if (typeof window === 'object' && window.RTCPeerConnection &&
        !('onaddstream' in window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
        get: function() {
          return this._onaddstream;
        },
        set: function(f) {
          if (this._onaddstream) {
            this.removeEventListener('addstream', this._onaddstream);
            this.removeEventListener('track', this._onaddstreampoly);
          }
          this.addEventListener('addstream', this._onaddstream = f);
          this.addEventListener('track', this._onaddstreampoly = function(e) {
            var stream = e.streams[0];
            if (!this._streams) {
              this._streams = [];
            }
            if (this._streams.indexOf(stream) >= 0) {
              return;
            }
            this._streams.push(stream);
            var event = new Event('addstream');
            event.stream = e.streams[0];
            this.dispatchEvent(event);
          }.bind(this));
        }
      });
    }
  },
  shimCallbacksAPI: function(window) {
    if (typeof window !== 'object' || !window.RTCPeerConnection) {
      return;
    }
    var prototype = window.RTCPeerConnection.prototype;
    var createOffer = prototype.createOffer;
    var createAnswer = prototype.createAnswer;
    var setLocalDescription = prototype.setLocalDescription;
    var setRemoteDescription = prototype.setRemoteDescription;
    var addIceCandidate = prototype.addIceCandidate;

    prototype.createOffer = function(successCallback, failureCallback) {
      var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
      var promise = createOffer.apply(this, [options]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };

    prototype.createAnswer = function(successCallback, failureCallback) {
      var options = (arguments.length >= 2) ? arguments[2] : arguments[0];
      var promise = createAnswer.apply(this, [options]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };

    var withCallback = function(description, successCallback, failureCallback) {
      var promise = setLocalDescription.apply(this, [description]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };
    prototype.setLocalDescription = withCallback;

    withCallback = function(description, successCallback, failureCallback) {
      var promise = setRemoteDescription.apply(this, [description]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };
    prototype.setRemoteDescription = withCallback;

    withCallback = function(candidate, successCallback, failureCallback) {
      var promise = addIceCandidate.apply(this, [candidate]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };
    prototype.addIceCandidate = withCallback;
  },
  shimGetUserMedia: function(window) {
    var navigator = window && window.navigator;

    if (!navigator.getUserMedia) {
      if (navigator.webkitGetUserMedia) {
        navigator.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
      } else if (navigator.mediaDevices &&
          navigator.mediaDevices.getUserMedia) {
        navigator.getUserMedia = function(constraints, cb, errcb) {
          navigator.mediaDevices.getUserMedia(constraints)
          .then(cb, errcb);
        }.bind(navigator);
      }
    }
  }
};

// Expose public methods.
module.exports = {
  shimCallbacksAPI: safariShim.shimCallbacksAPI,
  shimAddStream: safariShim.shimAddStream,
  shimOnAddStream: safariShim.shimOnAddStream,
  shimGetUserMedia: safariShim.shimGetUserMedia
  // TODO
  // shimPeerConnection: safariShim.shimPeerConnection
};

},{}],12:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var logDisabled_ = true;

// Utility methods.
var utils = {
  disableLog: function(bool) {
    if (typeof bool !== 'boolean') {
      return new Error('Argument type: ' + typeof bool +
          '. Please use a boolean.');
    }
    logDisabled_ = bool;
    return (bool) ? 'adapter.js logging disabled' :
        'adapter.js logging enabled';
  },

  log: function() {
    if (typeof window === 'object') {
      if (logDisabled_) {
        return;
      }
      if (typeof console !== 'undefined' && typeof console.log === 'function') {
        console.log.apply(console, arguments);
      }
    }
  },

  /**
   * Extract browser version out of the provided user agent string.
   *
   * @param {!string} uastring userAgent string.
   * @param {!string} expr Regular expression used as match criteria.
   * @param {!number} pos position in the version string to be returned.
   * @return {!number} browser version.
   */
  extractVersion: function(uastring, expr, pos) {
    var match = uastring.match(expr);
    return match && match.length >= pos && parseInt(match[pos], 10);
  },

  /**
   * Browser detector.
   *
   * @return {object} result containing browser and version
   *     properties.
   */
  detectBrowser: function(window) {
    var navigator = window && window.navigator;

    // Returned result object.
    var result = {};
    result.browser = null;
    result.version = null;

    // Fail early if it's not a browser
    if (typeof window === 'undefined' || !window.navigator) {
      result.browser = 'Not a browser.';
      return result;
    }

    // Firefox.
    if (navigator.mozGetUserMedia) {
      result.browser = 'firefox';
      result.version = this.extractVersion(navigator.userAgent,
          /Firefox\/(\d+)\./, 1);
    } else if (navigator.webkitGetUserMedia) {
      // Chrome, Chromium, Webview, Opera, all use the chrome shim for now
      if (window.webkitRTCPeerConnection) {
        result.browser = 'chrome';
        result.version = this.extractVersion(navigator.userAgent,
          /Chrom(e|ium)\/(\d+)\./, 2);
      } else { // Safari (in an unpublished version) or unknown webkit-based.
        if (navigator.userAgent.match(/Version\/(\d+).(\d+)/)) {
          result.browser = 'safari';
          result.version = this.extractVersion(navigator.userAgent,
            /AppleWebKit\/(\d+)\./, 1);
        } else { // unknown webkit-based browser.
          result.browser = 'Unsupported webkit-based browser ' +
              'with GUM support but no WebRTC support.';
          return result;
        }
      }
    } else if (navigator.mediaDevices &&
        navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) { // Edge.
      result.browser = 'edge';
      result.version = this.extractVersion(navigator.userAgent,
          /Edge\/(\d+).(\d+)$/, 2);
    } else if (navigator.mediaDevices &&
        navigator.userAgent.match(/AppleWebKit\/(\d+)\./)) {
        // Safari, with webkitGetUserMedia removed.
      result.browser = 'safari';
      result.version = this.extractVersion(navigator.userAgent,
          /AppleWebKit\/(\d+)\./, 1);
    } else { // Default fallthrough: not supported.
      result.browser = 'Not a supported browser.';
      return result;
    }

    return result;
  },

  // shimCreateObjectURL must be called before shimSourceObject to avoid loop.

  shimCreateObjectURL: function(window) {
    var URL = window && window.URL;

    if (!(typeof window === 'object' && window.HTMLMediaElement &&
          'srcObject' in window.HTMLMediaElement.prototype)) {
      // Only shim CreateObjectURL using srcObject if srcObject exists.
      return undefined;
    }

    var nativeCreateObjectURL = URL.createObjectURL.bind(URL);
    var nativeRevokeObjectURL = URL.revokeObjectURL.bind(URL);
    var streams = new Map(), newId = 0;

    URL.createObjectURL = function(stream) {
      if ('getTracks' in stream) {
        var url = 'polyblob:' + (++newId);
        streams.set(url, stream);
        console.log('URL.createObjectURL(stream) is deprecated! ' +
                    'Use elem.srcObject = stream instead!');
        return url;
      }
      return nativeCreateObjectURL(stream);
    };
    URL.revokeObjectURL = function(url) {
      nativeRevokeObjectURL(url);
      streams.delete(url);
    };

    var dsc = Object.getOwnPropertyDescriptor(window.HTMLMediaElement.prototype,
                                              'src');
    Object.defineProperty(window.HTMLMediaElement.prototype, 'src', {
      get: function() {
        return dsc.get.apply(this);
      },
      set: function(url) {
        this.srcObject = streams.get(url) || null;
        return dsc.set.apply(this, [url]);
      }
    });

    var nativeSetAttribute = window.HTMLMediaElement.prototype.setAttribute;
    window.HTMLMediaElement.prototype.setAttribute = function() {
      if (arguments.length === 2 &&
          ('' + arguments[0]).toLowerCase() === 'src') {
        this.srcObject = streams.get(arguments[1]) || null;
      }
      return nativeSetAttribute.apply(this, arguments);
    };
  }
};

// Export.
module.exports = {
  log: utils.log,
  disableLog: utils.disableLog,
  extractVersion: utils.extractVersion,
  shimCreateObjectURL: utils.shimCreateObjectURL,
  detectBrowser: utils.detectBrowser.bind(utils)
};

},{}]},{},[2])(2)
});
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.SimpleWebRTC = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
module.exports = after

function after(count, callback, err_cb) {
    var bail = false
    err_cb = err_cb || noop
    proxy.count = count

    return (count === 0) ? callback() : proxy

    function proxy(err, result) {
        if (proxy.count <= 0) {
            throw new Error('after called too many times')
        }
        --proxy.count

        // after first error, rest are passed to err_cb
        if (err) {
            bail = true
            callback(err)
            // future error callbacks will go to error handler
            callback = err_cb
        } else if (proxy.count === 0 && !bail) {
            callback(null, result)
        }
    }
}

function noop() {}

},{}],2:[function(require,module,exports){
/**
 * An abstraction for slicing an arraybuffer even when
 * ArrayBuffer.prototype.slice is not supported
 *
 * @api public
 */

module.exports = function(arraybuffer, start, end) {
  var bytes = arraybuffer.byteLength;
  start = start || 0;
  end = end || bytes;

  if (arraybuffer.slice) { return arraybuffer.slice(start, end); }

  if (start < 0) { start += bytes; }
  if (end < 0) { end += bytes; }
  if (end > bytes) { end = bytes; }

  if (start >= bytes || start >= end || bytes === 0) {
    return new ArrayBuffer(0);
  }

  var abv = new Uint8Array(arraybuffer);
  var result = new Uint8Array(end - start);
  for (var i = start, ii = 0; i < end; i++, ii++) {
    result[ii] = abv[i];
  }
  return result.buffer;
};

},{}],3:[function(require,module,exports){
var adapter = require('webrtc-adapter');
module.exports = function (stream, el, options) {
    var item;
    var URL = window.URL;
    var element = el;
    var opts = {
        autoplay: true,
        mirror: false,
        muted: false,
        audio: false,
        disableContextMenu: false
    };

    if (options) {
        for (item in options) {
            opts[item] = options[item];
        }
    }

    if (!element) {
        element = document.createElement(opts.audio ? 'audio' : 'video');
    } else if (element.tagName.toLowerCase() === 'audio') {
        opts.audio = true;
    }

    if (opts.disableContextMenu) {
        element.oncontextmenu = function (e) {
            e.preventDefault();
        };
    }

    if (opts.autoplay) element.autoplay = 'autoplay';
    if (opts.muted) element.muted = true;
    if (!opts.audio && opts.mirror) {
        ['', 'moz', 'webkit', 'o', 'ms'].forEach(function (prefix) {
            var styleName = prefix ? prefix + 'Transform' : 'transform';
            element.style[styleName] = 'scaleX(-1)';
        });
    }

    element.srcObject = stream;
    return element;
};

},{"webrtc-adapter":4}],4:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */

'use strict';

// Shimming starts here.
(function() {
  // Utils.
  var logging = require('./utils').log;
  var browserDetails = require('./utils').browserDetails;
  // Export to the adapter global object visible in the browser.
  module.exports.browserDetails = browserDetails;
  module.exports.extractVersion = require('./utils').extractVersion;
  module.exports.disableLog = require('./utils').disableLog;

  // Uncomment the line below if you want logging to occur, including logging
  // for the switch statement below. Can also be turned on in the browser via
  // adapter.disableLog(false), but then logging from the switch statement below
  // will not appear.
  // require('./utils').disableLog(false);

  // Browser shims.
  var chromeShim = require('./chrome/chrome_shim') || null;
  var edgeShim = require('./edge/edge_shim') || null;
  var firefoxShim = require('./firefox/firefox_shim') || null;
  var safariShim = require('./safari/safari_shim') || null;

  // Shim browser if found.
  switch (browserDetails.browser) {
    case 'opera': // fallthrough as it uses chrome shims
    case 'chrome':
      if (!chromeShim || !chromeShim.shimPeerConnection) {
        logging('Chrome shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming chrome.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = chromeShim;

      chromeShim.shimGetUserMedia();
      chromeShim.shimMediaStream();
      chromeShim.shimSourceObject();
      chromeShim.shimPeerConnection();
      chromeShim.shimOnTrack();
      break;
    case 'firefox':
      if (!firefoxShim || !firefoxShim.shimPeerConnection) {
        logging('Firefox shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming firefox.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = firefoxShim;

      firefoxShim.shimGetUserMedia();
      firefoxShim.shimSourceObject();
      firefoxShim.shimPeerConnection();
      firefoxShim.shimOnTrack();
      break;
    case 'edge':
      if (!edgeShim || !edgeShim.shimPeerConnection) {
        logging('MS edge shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming edge.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = edgeShim;

      edgeShim.shimGetUserMedia();
      edgeShim.shimPeerConnection();
      break;
    case 'safari':
      if (!safariShim) {
        logging('Safari shim is not included in this adapter release.');
        return;
      }
      logging('adapter.js shimming safari.');
      // Export to the adapter global object visible in the browser.
      module.exports.browserShim = safariShim;

      safariShim.shimGetUserMedia();
      break;
    default:
      logging('Unsupported browser!');
  }
})();

},{"./chrome/chrome_shim":5,"./edge/edge_shim":7,"./firefox/firefox_shim":9,"./safari/safari_shim":11,"./utils":12}],5:[function(require,module,exports){

/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';
var logging = require('../utils.js').log;
var browserDetails = require('../utils.js').browserDetails;

var chromeShim = {
  shimMediaStream: function() {
    window.MediaStream = window.MediaStream || window.webkitMediaStream;
  },

  shimOnTrack: function() {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          var self = this;
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', this._ontrackpoly = function(e) {
            // onaddstream does not fire when a track is added to an existing
            // stream. But stream.onaddtrack is implemented so we use that.
            e.stream.addEventListener('addtrack', function(te) {
              var event = new Event('track');
              event.track = te.track;
              event.receiver = {track: te.track};
              event.streams = [e.stream];
              self.dispatchEvent(event);
            });
            e.stream.getTracks().forEach(function(track) {
              var event = new Event('track');
              event.track = track;
              event.receiver = {track: track};
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimSourceObject: function() {
    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this._srcObject;
          },
          set: function(stream) {
            var self = this;
            // Use _srcObject as a private property for this shim
            this._srcObject = stream;
            if (this.src) {
              URL.revokeObjectURL(this.src);
            }

            if (!stream) {
              this.src = '';
              return;
            }
            this.src = URL.createObjectURL(stream);
            // We need to recreate the blob url when a track is added or
            // removed. Doing it manually since we want to avoid a recursion.
            stream.addEventListener('addtrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
            stream.addEventListener('removetrack', function() {
              if (self.src) {
                URL.revokeObjectURL(self.src);
              }
              self.src = URL.createObjectURL(stream);
            });
          }
        });
      }
    }
  },

  shimPeerConnection: function() {
    // The RTCPeerConnection object.
    window.RTCPeerConnection = function(pcConfig, pcConstraints) {
      // Translate iceTransportPolicy to iceTransports,
      // see https://code.google.com/p/webrtc/issues/detail?id=4869
      logging('PeerConnection');
      if (pcConfig && pcConfig.iceTransportPolicy) {
        pcConfig.iceTransports = pcConfig.iceTransportPolicy;
      }

      var pc = new webkitRTCPeerConnection(pcConfig, pcConstraints);
      var origGetStats = pc.getStats.bind(pc);
      pc.getStats = function(selector, successCallback, errorCallback) {
        var self = this;
        var args = arguments;

        // If selector is a function then we are in the old style stats so just
        // pass back the original getStats format to avoid breaking old users.
        if (arguments.length > 0 && typeof selector === 'function') {
          return origGetStats(selector, successCallback);
        }

        var fixChromeStats_ = function(response) {
          var standardReport = {};
          var reports = response.result();
          reports.forEach(function(report) {
            var standardStats = {
              id: report.id,
              timestamp: report.timestamp,
              type: report.type
            };
            report.names().forEach(function(name) {
              standardStats[name] = report.stat(name);
            });
            standardReport[standardStats.id] = standardStats;
          });

          return standardReport;
        };

        // shim getStats with maplike support
        var makeMapStats = function(stats, legacyStats) {
          var map = new Map(Object.keys(stats).map(function(key) {
            return[key, stats[key]];
          }));
          legacyStats = legacyStats || stats;
          Object.keys(legacyStats).forEach(function(key) {
            map[key] = legacyStats[key];
          });
          return map;
        };

        if (arguments.length >= 2) {
          var successCallbackWrapper_ = function(response) {
            args[1](makeMapStats(fixChromeStats_(response)));
          };

          return origGetStats.apply(this, [successCallbackWrapper_,
              arguments[0]]);
        }

        // promise-support
        return new Promise(function(resolve, reject) {
          if (args.length === 1 && typeof selector === 'object') {
            origGetStats.apply(self, [
              function(response) {
                resolve(makeMapStats(fixChromeStats_(response)));
              }, reject]);
          } else {
            // Preserve legacy chrome stats only on legacy access of stats obj
            origGetStats.apply(self, [
              function(response) {
                resolve(makeMapStats(fixChromeStats_(response),
                    response.result()));
              }, reject]);
          }
        }).then(successCallback, errorCallback);
      };

      return pc;
    };
    window.RTCPeerConnection.prototype = webkitRTCPeerConnection.prototype;

    // wrap static methods. Currently just generateCertificate.
    if (webkitRTCPeerConnection.generateCertificate) {
      Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
        get: function() {
          return webkitRTCPeerConnection.generateCertificate;
        }
      });
    }

    ['createOffer', 'createAnswer'].forEach(function(method) {
      var nativeMethod = webkitRTCPeerConnection.prototype[method];
      webkitRTCPeerConnection.prototype[method] = function() {
        var self = this;
        if (arguments.length < 1 || (arguments.length === 1 &&
            typeof arguments[0] === 'object')) {
          var opts = arguments.length === 1 ? arguments[0] : undefined;
          return new Promise(function(resolve, reject) {
            nativeMethod.apply(self, [resolve, reject, opts]);
          });
        }
        return nativeMethod.apply(this, arguments);
      };
    });

    // add promise support -- natively available in Chrome 51
    if (browserDetails.version < 51) {
      ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
          .forEach(function(method) {
            var nativeMethod = webkitRTCPeerConnection.prototype[method];
            webkitRTCPeerConnection.prototype[method] = function() {
              var args = arguments;
              var self = this;
              var promise = new Promise(function(resolve, reject) {
                nativeMethod.apply(self, [args[0], resolve, reject]);
              });
              if (args.length < 2) {
                return promise;
              }
              return promise.then(function() {
                args[1].apply(null, []);
              },
              function(err) {
                if (args.length >= 3) {
                  args[2].apply(null, [err]);
                }
              });
            };
          });
    }

    // shim implicit creation of RTCSessionDescription/RTCIceCandidate
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = webkitRTCPeerConnection.prototype[method];
          webkitRTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                RTCIceCandidate : RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null or undefined)
    var nativeAddIceCandidate =
        RTCPeerConnection.prototype.addIceCandidate;
    RTCPeerConnection.prototype.addIceCandidate = function() {
      if (!arguments[0]) {
        if (arguments[1]) {
          arguments[1].apply(null);
        }
        return Promise.resolve();
      }
      return nativeAddIceCandidate.apply(this, arguments);
    };
  }
};


// Expose public methods.
module.exports = {
  shimMediaStream: chromeShim.shimMediaStream,
  shimOnTrack: chromeShim.shimOnTrack,
  shimSourceObject: chromeShim.shimSourceObject,
  shimPeerConnection: chromeShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils.js":12,"./getusermedia":6}],6:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';
var logging = require('../utils.js').log;

// Expose public methods.
module.exports = function() {
  var constraintsToChrome_ = function(c) {
    if (typeof c !== 'object' || c.mandatory || c.optional) {
      return c;
    }
    var cc = {};
    Object.keys(c).forEach(function(key) {
      if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
        return;
      }
      var r = (typeof c[key] === 'object') ? c[key] : {ideal: c[key]};
      if (r.exact !== undefined && typeof r.exact === 'number') {
        r.min = r.max = r.exact;
      }
      var oldname_ = function(prefix, name) {
        if (prefix) {
          return prefix + name.charAt(0).toUpperCase() + name.slice(1);
        }
        return (name === 'deviceId') ? 'sourceId' : name;
      };
      if (r.ideal !== undefined) {
        cc.optional = cc.optional || [];
        var oc = {};
        if (typeof r.ideal === 'number') {
          oc[oldname_('min', key)] = r.ideal;
          cc.optional.push(oc);
          oc = {};
          oc[oldname_('max', key)] = r.ideal;
          cc.optional.push(oc);
        } else {
          oc[oldname_('', key)] = r.ideal;
          cc.optional.push(oc);
        }
      }
      if (r.exact !== undefined && typeof r.exact !== 'number') {
        cc.mandatory = cc.mandatory || {};
        cc.mandatory[oldname_('', key)] = r.exact;
      } else {
        ['min', 'max'].forEach(function(mix) {
          if (r[mix] !== undefined) {
            cc.mandatory = cc.mandatory || {};
            cc.mandatory[oldname_(mix, key)] = r[mix];
          }
        });
      }
    });
    if (c.advanced) {
      cc.optional = (cc.optional || []).concat(c.advanced);
    }
    return cc;
  };

  var shimConstraints_ = function(constraints, func) {
    constraints = JSON.parse(JSON.stringify(constraints));
    if (constraints && constraints.audio) {
      constraints.audio = constraintsToChrome_(constraints.audio);
    }
    if (constraints && typeof constraints.video === 'object') {
      // Shim facingMode for mobile, where it defaults to "user".
      var face = constraints.video.facingMode;
      face = face && ((typeof face === 'object') ? face : {ideal: face});

      if ((face && (face.exact === 'user' || face.exact === 'environment' ||
                    face.ideal === 'user' || face.ideal === 'environment')) &&
          !(navigator.mediaDevices.getSupportedConstraints &&
            navigator.mediaDevices.getSupportedConstraints().facingMode)) {
        delete constraints.video.facingMode;
        if (face.exact === 'environment' || face.ideal === 'environment') {
          // Look for "back" in label, or use last cam (typically back cam).
          return navigator.mediaDevices.enumerateDevices()
          .then(function(devices) {
            devices = devices.filter(function(d) {
              return d.kind === 'videoinput';
            });
            var back = devices.find(function(d) {
              return d.label.toLowerCase().indexOf('back') !== -1;
            }) || (devices.length && devices[devices.length - 1]);
            if (back) {
              constraints.video.deviceId = face.exact ? {exact: back.deviceId} :
                                                        {ideal: back.deviceId};
            }
            constraints.video = constraintsToChrome_(constraints.video);
            logging('chrome: ' + JSON.stringify(constraints));
            return func(constraints);
          });
        }
      }
      constraints.video = constraintsToChrome_(constraints.video);
    }
    logging('chrome: ' + JSON.stringify(constraints));
    return func(constraints);
  };

  var shimError_ = function(e) {
    return {
      name: {
        PermissionDeniedError: 'NotAllowedError',
        ConstraintNotSatisfiedError: 'OverconstrainedError'
      }[e.name] || e.name,
      message: e.message,
      constraint: e.constraintName,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  var getUserMedia_ = function(constraints, onSuccess, onError) {
    shimConstraints_(constraints, function(c) {
      navigator.webkitGetUserMedia(c, onSuccess, function(e) {
        onError(shimError_(e));
      });
    });
  };

  navigator.getUserMedia = getUserMedia_;

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      navigator.getUserMedia(constraints, resolve, reject);
    });
  };

  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {
      getUserMedia: getUserMediaPromise_,
      enumerateDevices: function() {
        return new Promise(function(resolve) {
          var kinds = {audio: 'audioinput', video: 'videoinput'};
          return MediaStreamTrack.getSources(function(devices) {
            resolve(devices.map(function(device) {
              return {label: device.label,
                      kind: kinds[device.kind],
                      deviceId: device.id,
                      groupId: ''};
            }));
          });
        });
      }
    };
  }

  // A shim for getUserMedia method on the mediaDevices object.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (!navigator.mediaDevices.getUserMedia) {
    navigator.mediaDevices.getUserMedia = function(constraints) {
      return getUserMediaPromise_(constraints);
    };
  } else {
    // Even though Chrome 45 has navigator.mediaDevices and a getUserMedia
    // function which returns a Promise, it does not accept spec-style
    // constraints.
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(cs) {
      return shimConstraints_(cs, function(c) {
        return origGetUserMedia(c).then(function(stream) {
          if (c.audio && !stream.getAudioTracks().length ||
              c.video && !stream.getVideoTracks().length) {
            stream.getTracks().forEach(function(track) {
              track.stop();
            });
            throw new DOMException('', 'NotFoundError');
          }
          return stream;
        }, function(e) {
          return Promise.reject(shimError_(e));
        });
      });
    };
  }

  // Dummy devicechange event methods.
  // TODO(KaptenJansson) remove once implemented in Chrome stable.
  if (typeof navigator.mediaDevices.addEventListener === 'undefined') {
    navigator.mediaDevices.addEventListener = function() {
      logging('Dummy mediaDevices.addEventListener called.');
    };
  }
  if (typeof navigator.mediaDevices.removeEventListener === 'undefined') {
    navigator.mediaDevices.removeEventListener = function() {
      logging('Dummy mediaDevices.removeEventListener called.');
    };
  }
};

},{"../utils.js":12}],7:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var SDPUtils = require('sdp');
var browserDetails = require('../utils').browserDetails;

var edgeShim = {
  shimPeerConnection: function() {
    if (window.RTCIceGatherer) {
      // ORTC defines an RTCIceCandidate object but no constructor.
      // Not implemented in Edge.
      if (!window.RTCIceCandidate) {
        window.RTCIceCandidate = function(args) {
          return args;
        };
      }
      // ORTC does not have a session description object but
      // other browsers (i.e. Chrome) that will support both PC and ORTC
      // in the future might have this defined already.
      if (!window.RTCSessionDescription) {
        window.RTCSessionDescription = function(args) {
          return args;
        };
      }
      // this adds an additional event listener to MediaStrackTrack that signals
      // when a tracks enabled property was changed.
      var origMSTEnabled = Object.getOwnPropertyDescriptor(
          MediaStreamTrack.prototype, 'enabled');
      Object.defineProperty(MediaStreamTrack.prototype, 'enabled', {
        set: function(value) {
          origMSTEnabled.set.call(this, value);
          var ev = new Event('enabled');
          ev.enabled = value;
          this.dispatchEvent(ev);
        }
      });
    }

    window.RTCPeerConnection = function(config) {
      var self = this;

      var _eventTarget = document.createDocumentFragment();
      ['addEventListener', 'removeEventListener', 'dispatchEvent']
          .forEach(function(method) {
            self[method] = _eventTarget[method].bind(_eventTarget);
          });

      this.onicecandidate = null;
      this.onaddstream = null;
      this.ontrack = null;
      this.onremovestream = null;
      this.onsignalingstatechange = null;
      this.oniceconnectionstatechange = null;
      this.onnegotiationneeded = null;
      this.ondatachannel = null;

      this.localStreams = [];
      this.remoteStreams = [];
      this.getLocalStreams = function() {
        return self.localStreams;
      };
      this.getRemoteStreams = function() {
        return self.remoteStreams;
      };

      this.localDescription = new RTCSessionDescription({
        type: '',
        sdp: ''
      });
      this.remoteDescription = new RTCSessionDescription({
        type: '',
        sdp: ''
      });
      this.signalingState = 'stable';
      this.iceConnectionState = 'new';
      this.iceGatheringState = 'new';

      this.iceOptions = {
        gatherPolicy: 'all',
        iceServers: []
      };
      if (config && config.iceTransportPolicy) {
        switch (config.iceTransportPolicy) {
          case 'all':
          case 'relay':
            this.iceOptions.gatherPolicy = config.iceTransportPolicy;
            break;
          case 'none':
            // FIXME: remove once implementation and spec have added this.
            throw new TypeError('iceTransportPolicy "none" not supported');
          default:
            // don't set iceTransportPolicy.
            break;
        }
      }
      this.usingBundle = config && config.bundlePolicy === 'max-bundle';

      if (config && config.iceServers) {
        // Edge does not like
        // 1) stun:
        // 2) turn: that does not have all of turn:host:port?transport=udp
        // 3) turn: with ipv6 addresses
        var iceServers = JSON.parse(JSON.stringify(config.iceServers));
        this.iceOptions.iceServers = iceServers.filter(function(server) {
          if (server && server.urls) {
            var urls = server.urls;
            if (typeof urls === 'string') {
              urls = [urls];
            }
            urls = urls.filter(function(url) {
              return (url.indexOf('turn:') === 0 &&
                  url.indexOf('transport=udp') !== -1 &&
                  url.indexOf('turn:[') === -1) ||
                  (url.indexOf('stun:') === 0 &&
                    browserDetails.version >= 14393);
            })[0];
            return !!urls;
          }
          return false;
        });
      }
      this._config = config;

      // per-track iceGathers, iceTransports, dtlsTransports, rtpSenders, ...
      // everything that is needed to describe a SDP m-line.
      this.transceivers = [];

      // since the iceGatherer is currently created in createOffer but we
      // must not emit candidates until after setLocalDescription we buffer
      // them in this array.
      this._localIceCandidatesBuffer = [];
    };

    window.RTCPeerConnection.prototype._emitBufferedCandidates = function() {
      var self = this;
      var sections = SDPUtils.splitSections(self.localDescription.sdp);
      // FIXME: need to apply ice candidates in a way which is async but
      // in-order
      this._localIceCandidatesBuffer.forEach(function(event) {
        var end = !event.candidate || Object.keys(event.candidate).length === 0;
        if (end) {
          for (var j = 1; j < sections.length; j++) {
            if (sections[j].indexOf('\r\na=end-of-candidates\r\n') === -1) {
              sections[j] += 'a=end-of-candidates\r\n';
            }
          }
        } else if (event.candidate.candidate.indexOf('typ endOfCandidates')
            === -1) {
          sections[event.candidate.sdpMLineIndex + 1] +=
              'a=' + event.candidate.candidate + '\r\n';
        }
        self.localDescription.sdp = sections.join('');
        self.dispatchEvent(event);
        if (self.onicecandidate !== null) {
          self.onicecandidate(event);
        }
        if (!event.candidate && self.iceGatheringState !== 'complete') {
          var complete = self.transceivers.every(function(transceiver) {
            return transceiver.iceGatherer &&
                transceiver.iceGatherer.state === 'completed';
          });
          if (complete) {
            self.iceGatheringState = 'complete';
          }
        }
      });
      this._localIceCandidatesBuffer = [];
    };

    window.RTCPeerConnection.prototype.getConfiguration = function() {
      return this._config;
    };

    window.RTCPeerConnection.prototype.addStream = function(stream) {
      // Clone is necessary for local demos mostly, attaching directly
      // to two different senders does not work (build 10547).
      var clonedStream = stream.clone();
      stream.getTracks().forEach(function(track, idx) {
        var clonedTrack = clonedStream.getTracks()[idx];
        track.addEventListener('enabled', function(event) {
          clonedTrack.enabled = event.enabled;
        });
      });
      this.localStreams.push(clonedStream);
      this._maybeFireNegotiationNeeded();
    };

    window.RTCPeerConnection.prototype.removeStream = function(stream) {
      var idx = this.localStreams.indexOf(stream);
      if (idx > -1) {
        this.localStreams.splice(idx, 1);
        this._maybeFireNegotiationNeeded();
      }
    };

    window.RTCPeerConnection.prototype.getSenders = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpSender;
      })
      .map(function(transceiver) {
        return transceiver.rtpSender;
      });
    };

    window.RTCPeerConnection.prototype.getReceivers = function() {
      return this.transceivers.filter(function(transceiver) {
        return !!transceiver.rtpReceiver;
      })
      .map(function(transceiver) {
        return transceiver.rtpReceiver;
      });
    };

    // Determines the intersection of local and remote capabilities.
    window.RTCPeerConnection.prototype._getCommonCapabilities =
        function(localCapabilities, remoteCapabilities) {
          var commonCapabilities = {
            codecs: [],
            headerExtensions: [],
            fecMechanisms: []
          };
          localCapabilities.codecs.forEach(function(lCodec) {
            for (var i = 0; i < remoteCapabilities.codecs.length; i++) {
              var rCodec = remoteCapabilities.codecs[i];
              if (lCodec.name.toLowerCase() === rCodec.name.toLowerCase() &&
                  lCodec.clockRate === rCodec.clockRate) {
                // number of channels is the highest common number of channels
                rCodec.numChannels = Math.min(lCodec.numChannels,
                    rCodec.numChannels);
                // push rCodec so we reply with offerer payload type
                commonCapabilities.codecs.push(rCodec);

                // determine common feedback mechanisms
                rCodec.rtcpFeedback = rCodec.rtcpFeedback.filter(function(fb) {
                  for (var j = 0; j < lCodec.rtcpFeedback.length; j++) {
                    if (lCodec.rtcpFeedback[j].type === fb.type &&
                        lCodec.rtcpFeedback[j].parameter === fb.parameter) {
                      return true;
                    }
                  }
                  return false;
                });
                // FIXME: also need to determine .parameters
                //  see https://github.com/openpeer/ortc/issues/569
                break;
              }
            }
          });

          localCapabilities.headerExtensions
              .forEach(function(lHeaderExtension) {
                for (var i = 0; i < remoteCapabilities.headerExtensions.length;
                     i++) {
                  var rHeaderExtension = remoteCapabilities.headerExtensions[i];
                  if (lHeaderExtension.uri === rHeaderExtension.uri) {
                    commonCapabilities.headerExtensions.push(rHeaderExtension);
                    break;
                  }
                }
              });

          // FIXME: fecMechanisms
          return commonCapabilities;
        };

    // Create ICE gatherer, ICE transport and DTLS transport.
    window.RTCPeerConnection.prototype._createIceAndDtlsTransports =
        function(mid, sdpMLineIndex) {
          var self = this;
          var iceGatherer = new RTCIceGatherer(self.iceOptions);
          var iceTransport = new RTCIceTransport(iceGatherer);
          iceGatherer.onlocalcandidate = function(evt) {
            var event = new Event('icecandidate');
            event.candidate = {sdpMid: mid, sdpMLineIndex: sdpMLineIndex};

            var cand = evt.candidate;
            var end = !cand || Object.keys(cand).length === 0;
            // Edge emits an empty object for RTCIceCandidateComplete‥
            if (end) {
              // polyfill since RTCIceGatherer.state is not implemented in
              // Edge 10547 yet.
              if (iceGatherer.state === undefined) {
                iceGatherer.state = 'completed';
              }

              // Emit a candidate with type endOfCandidates to make the samples
              // work. Edge requires addIceCandidate with this empty candidate
              // to start checking. The real solution is to signal
              // end-of-candidates to the other side when getting the null
              // candidate but some apps (like the samples) don't do that.
              event.candidate.candidate =
                  'candidate:1 1 udp 1 0.0.0.0 9 typ endOfCandidates';
            } else {
              // RTCIceCandidate doesn't have a component, needs to be added
              cand.component = iceTransport.component === 'RTCP' ? 2 : 1;
              event.candidate.candidate = SDPUtils.writeCandidate(cand);
            }

            // update local description.
            var sections = SDPUtils.splitSections(self.localDescription.sdp);
            if (event.candidate.candidate.indexOf('typ endOfCandidates')
                === -1) {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=' + event.candidate.candidate + '\r\n';
            } else {
              sections[event.candidate.sdpMLineIndex + 1] +=
                  'a=end-of-candidates\r\n';
            }
            self.localDescription.sdp = sections.join('');

            var complete = self.transceivers.every(function(transceiver) {
              return transceiver.iceGatherer &&
                  transceiver.iceGatherer.state === 'completed';
            });

            // Emit candidate if localDescription is set.
            // Also emits null candidate when all gatherers are complete.
            switch (self.iceGatheringState) {
              case 'new':
                self._localIceCandidatesBuffer.push(event);
                if (end && complete) {
                  self._localIceCandidatesBuffer.push(
                      new Event('icecandidate'));
                }
                break;
              case 'gathering':
                self._emitBufferedCandidates();
                self.dispatchEvent(event);
                if (self.onicecandidate !== null) {
                  self.onicecandidate(event);
                }
                if (complete) {
                  self.dispatchEvent(new Event('icecandidate'));
                  if (self.onicecandidate !== null) {
                    self.onicecandidate(new Event('icecandidate'));
                  }
                  self.iceGatheringState = 'complete';
                }
                break;
              case 'complete':
                // should not happen... currently!
                break;
              default: // no-op.
                break;
            }
          };
          iceTransport.onicestatechange = function() {
            self._updateConnectionState();
          };

          var dtlsTransport = new RTCDtlsTransport(iceTransport);
          dtlsTransport.ondtlsstatechange = function() {
            self._updateConnectionState();
          };
          dtlsTransport.onerror = function() {
            // onerror does not set state to failed by itself.
            dtlsTransport.state = 'failed';
            self._updateConnectionState();
          };

          return {
            iceGatherer: iceGatherer,
            iceTransport: iceTransport,
            dtlsTransport: dtlsTransport
          };
        };

    // Start the RTP Sender and Receiver for a transceiver.
    window.RTCPeerConnection.prototype._transceive = function(transceiver,
        send, recv) {
      var params = this._getCommonCapabilities(transceiver.localCapabilities,
          transceiver.remoteCapabilities);
      if (send && transceiver.rtpSender) {
        params.encodings = transceiver.sendEncodingParameters;
        params.rtcp = {
          cname: SDPUtils.localCName
        };
        if (transceiver.recvEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.recvEncodingParameters[0].ssrc;
        }
        transceiver.rtpSender.send(params);
      }
      if (recv && transceiver.rtpReceiver) {
        // remove RTX field in Edge 14942
        if (transceiver.kind === 'video'
            && transceiver.recvEncodingParameters) {
          transceiver.recvEncodingParameters.forEach(function(p) {
            delete p.rtx;
          });
        }
        params.encodings = transceiver.recvEncodingParameters;
        params.rtcp = {
          cname: transceiver.cname
        };
        if (transceiver.sendEncodingParameters.length) {
          params.rtcp.ssrc = transceiver.sendEncodingParameters[0].ssrc;
        }
        transceiver.rtpReceiver.receive(params);
      }
    };

    window.RTCPeerConnection.prototype.setLocalDescription =
        function(description) {
          var self = this;
          var sections;
          var sessionpart;
          if (description.type === 'offer') {
            // FIXME: What was the purpose of this empty if statement?
            // if (!this._pendingOffer) {
            // } else {
            if (this._pendingOffer) {
              // VERY limited support for SDP munging. Limited to:
              // * changing the order of codecs
              sections = SDPUtils.splitSections(description.sdp);
              sessionpart = sections.shift();
              sections.forEach(function(mediaSection, sdpMLineIndex) {
                var caps = SDPUtils.parseRtpParameters(mediaSection);
                self._pendingOffer[sdpMLineIndex].localCapabilities = caps;
              });
              this.transceivers = this._pendingOffer;
              delete this._pendingOffer;
            }
          } else if (description.type === 'answer') {
            sections = SDPUtils.splitSections(self.remoteDescription.sdp);
            sessionpart = sections.shift();
            var isIceLite = SDPUtils.matchPrefix(sessionpart,
                'a=ice-lite').length > 0;
            sections.forEach(function(mediaSection, sdpMLineIndex) {
              var transceiver = self.transceivers[sdpMLineIndex];
              var iceGatherer = transceiver.iceGatherer;
              var iceTransport = transceiver.iceTransport;
              var dtlsTransport = transceiver.dtlsTransport;
              var localCapabilities = transceiver.localCapabilities;
              var remoteCapabilities = transceiver.remoteCapabilities;

              var rejected = mediaSection.split('\n', 1)[0]
                  .split(' ', 2)[1] === '0';

              if (!rejected && !transceiver.isDatachannel) {
                var remoteIceParameters = SDPUtils.getIceParameters(
                    mediaSection, sessionpart);
                if (isIceLite) {
                  var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
                  .map(function(cand) {
                    return SDPUtils.parseCandidate(cand);
                  })
                  .filter(function(cand) {
                    return cand.component === '1';
                  });
                  // ice-lite only includes host candidates in the SDP so we can
                  // use setRemoteCandidates (which implies an
                  // RTCIceCandidateComplete)
                  if (cands.length) {
                    iceTransport.setRemoteCandidates(cands);
                  }
                }
                var remoteDtlsParameters = SDPUtils.getDtlsParameters(
                    mediaSection, sessionpart);
                if (isIceLite) {
                  remoteDtlsParameters.role = 'server';
                }

                if (!self.usingBundle || sdpMLineIndex === 0) {
                  iceTransport.start(iceGatherer, remoteIceParameters,
                      isIceLite ? 'controlling' : 'controlled');
                  dtlsTransport.start(remoteDtlsParameters);
                }

                // Calculate intersection of capabilities.
                var params = self._getCommonCapabilities(localCapabilities,
                    remoteCapabilities);

                // Start the RTCRtpSender. The RTCRtpReceiver for this
                // transceiver has already been started in setRemoteDescription.
                self._transceive(transceiver,
                    params.codecs.length > 0,
                    false);
              }
            });
          }

          this.localDescription = {
            type: description.type,
            sdp: description.sdp
          };
          switch (description.type) {
            case 'offer':
              this._updateSignalingState('have-local-offer');
              break;
            case 'answer':
              this._updateSignalingState('stable');
              break;
            default:
              throw new TypeError('unsupported type "' + description.type +
                  '"');
          }

          // If a success callback was provided, emit ICE candidates after it
          // has been executed. Otherwise, emit callback after the Promise is
          // resolved.
          var hasCallback = arguments.length > 1 &&
            typeof arguments[1] === 'function';
          if (hasCallback) {
            var cb = arguments[1];
            window.setTimeout(function() {
              cb();
              if (self.iceGatheringState === 'new') {
                self.iceGatheringState = 'gathering';
              }
              self._emitBufferedCandidates();
            }, 0);
          }
          var p = Promise.resolve();
          p.then(function() {
            if (!hasCallback) {
              if (self.iceGatheringState === 'new') {
                self.iceGatheringState = 'gathering';
              }
              // Usually candidates will be emitted earlier.
              window.setTimeout(self._emitBufferedCandidates.bind(self), 500);
            }
          });
          return p;
        };

    window.RTCPeerConnection.prototype.setRemoteDescription =
        function(description) {
          var self = this;
          var stream = new MediaStream();
          var receiverList = [];
          var sections = SDPUtils.splitSections(description.sdp);
          var sessionpart = sections.shift();
          var isIceLite = SDPUtils.matchPrefix(sessionpart,
              'a=ice-lite').length > 0;
          this.usingBundle = SDPUtils.matchPrefix(sessionpart,
              'a=group:BUNDLE ').length > 0;
          sections.forEach(function(mediaSection, sdpMLineIndex) {
            var lines = SDPUtils.splitLines(mediaSection);
            var mline = lines[0].substr(2).split(' ');
            var kind = mline[0];
            var rejected = mline[1] === '0';
            var direction = SDPUtils.getDirection(mediaSection, sessionpart);

            var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:');
            if (mid.length) {
              mid = mid[0].substr(6);
            } else {
              mid = SDPUtils.generateIdentifier();
            }

            // Reject datachannels which are not implemented yet.
            if (kind === 'application' && mline[2] === 'DTLS/SCTP') {
              self.transceivers[sdpMLineIndex] = {
                mid: mid,
                isDatachannel: true
              };
              return;
            }

            var transceiver;
            var iceGatherer;
            var iceTransport;
            var dtlsTransport;
            var rtpSender;
            var rtpReceiver;
            var sendEncodingParameters;
            var recvEncodingParameters;
            var localCapabilities;

            var track;
            // FIXME: ensure the mediaSection has rtcp-mux set.
            var remoteCapabilities = SDPUtils.parseRtpParameters(mediaSection);
            var remoteIceParameters;
            var remoteDtlsParameters;
            if (!rejected) {
              remoteIceParameters = SDPUtils.getIceParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters = SDPUtils.getDtlsParameters(mediaSection,
                  sessionpart);
              remoteDtlsParameters.role = 'client';
            }
            recvEncodingParameters =
                SDPUtils.parseRtpEncodingParameters(mediaSection);

            var cname;
            // Gets the first SSRC. Note that with RTX there might be multiple
            // SSRCs.
            var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
                .map(function(line) {
                  return SDPUtils.parseSsrcMedia(line);
                })
                .filter(function(obj) {
                  return obj.attribute === 'cname';
                })[0];
            if (remoteSsrc) {
              cname = remoteSsrc.value;
            }

            var isComplete = SDPUtils.matchPrefix(mediaSection,
                'a=end-of-candidates', sessionpart).length > 0;
            var cands = SDPUtils.matchPrefix(mediaSection, 'a=candidate:')
                .map(function(cand) {
                  return SDPUtils.parseCandidate(cand);
                })
                .filter(function(cand) {
                  return cand.component === '1';
                });
            if (description.type === 'offer' && !rejected) {
              var transports = self.usingBundle && sdpMLineIndex > 0 ? {
                iceGatherer: self.transceivers[0].iceGatherer,
                iceTransport: self.transceivers[0].iceTransport,
                dtlsTransport: self.transceivers[0].dtlsTransport
              } : self._createIceAndDtlsTransports(mid, sdpMLineIndex);

              if (isComplete) {
                transports.iceTransport.setRemoteCandidates(cands);
              }

              localCapabilities = RTCRtpReceiver.getCapabilities(kind);

              // filter RTX until additional stuff needed for RTX is implemented
              // in adapter.js
              localCapabilities.codecs = localCapabilities.codecs.filter(
                  function(codec) {
                    return codec.name !== 'rtx';
                  });

              sendEncodingParameters = [{
                ssrc: (2 * sdpMLineIndex + 2) * 1001
              }];

              rtpReceiver = new RTCRtpReceiver(transports.dtlsTransport, kind);

              track = rtpReceiver.track;
              receiverList.push([track, rtpReceiver]);
              // FIXME: not correct when there are multiple streams but that is
              // not currently supported in this shim.
              stream.addTrack(track);

              // FIXME: look at direction.
              if (self.localStreams.length > 0 &&
                  self.localStreams[0].getTracks().length >= sdpMLineIndex) {
                var localTrack;
                if (kind === 'audio') {
                  localTrack = self.localStreams[0].getAudioTracks()[0];
                } else if (kind === 'video') {
                  localTrack = self.localStreams[0].getVideoTracks()[0];
                }
                if (localTrack) {
                  rtpSender = new RTCRtpSender(localTrack,
                      transports.dtlsTransport);
                }
              }

              self.transceivers[sdpMLineIndex] = {
                iceGatherer: transports.iceGatherer,
                iceTransport: transports.iceTransport,
                dtlsTransport: transports.dtlsTransport,
                localCapabilities: localCapabilities,
                remoteCapabilities: remoteCapabilities,
                rtpSender: rtpSender,
                rtpReceiver: rtpReceiver,
                kind: kind,
                mid: mid,
                cname: cname,
                sendEncodingParameters: sendEncodingParameters,
                recvEncodingParameters: recvEncodingParameters
              };
              // Start the RTCRtpReceiver now. The RTPSender is started in
              // setLocalDescription.
              self._transceive(self.transceivers[sdpMLineIndex],
                  false,
                  direction === 'sendrecv' || direction === 'sendonly');
            } else if (description.type === 'answer' && !rejected) {
              transceiver = self.transceivers[sdpMLineIndex];
              iceGatherer = transceiver.iceGatherer;
              iceTransport = transceiver.iceTransport;
              dtlsTransport = transceiver.dtlsTransport;
              rtpSender = transceiver.rtpSender;
              rtpReceiver = transceiver.rtpReceiver;
              sendEncodingParameters = transceiver.sendEncodingParameters;
              localCapabilities = transceiver.localCapabilities;

              self.transceivers[sdpMLineIndex].recvEncodingParameters =
                  recvEncodingParameters;
              self.transceivers[sdpMLineIndex].remoteCapabilities =
                  remoteCapabilities;
              self.transceivers[sdpMLineIndex].cname = cname;

              if ((isIceLite || isComplete) && cands.length) {
                iceTransport.setRemoteCandidates(cands);
              }
              if (!self.usingBundle || sdpMLineIndex === 0) {
                iceTransport.start(iceGatherer, remoteIceParameters,
                    'controlling');
                dtlsTransport.start(remoteDtlsParameters);
              }

              self._transceive(transceiver,
                  direction === 'sendrecv' || direction === 'recvonly',
                  direction === 'sendrecv' || direction === 'sendonly');

              if (rtpReceiver &&
                  (direction === 'sendrecv' || direction === 'sendonly')) {
                track = rtpReceiver.track;
                receiverList.push([track, rtpReceiver]);
                stream.addTrack(track);
              } else {
                // FIXME: actually the receiver should be created later.
                delete transceiver.rtpReceiver;
              }
            }
          });

          this.remoteDescription = {
            type: description.type,
            sdp: description.sdp
          };
          switch (description.type) {
            case 'offer':
              this._updateSignalingState('have-remote-offer');
              break;
            case 'answer':
              this._updateSignalingState('stable');
              break;
            default:
              throw new TypeError('unsupported type "' + description.type +
                  '"');
          }
          if (stream.getTracks().length) {
            self.remoteStreams.push(stream);
            window.setTimeout(function() {
              var event = new Event('addstream');
              event.stream = stream;
              self.dispatchEvent(event);
              if (self.onaddstream !== null) {
                window.setTimeout(function() {
                  self.onaddstream(event);
                }, 0);
              }

              receiverList.forEach(function(item) {
                var track = item[0];
                var receiver = item[1];
                var trackEvent = new Event('track');
                trackEvent.track = track;
                trackEvent.receiver = receiver;
                trackEvent.streams = [stream];
                self.dispatchEvent(event);
                if (self.ontrack !== null) {
                  window.setTimeout(function() {
                    self.ontrack(trackEvent);
                  }, 0);
                }
              });
            }, 0);
          }
          if (arguments.length > 1 && typeof arguments[1] === 'function') {
            window.setTimeout(arguments[1], 0);
          }
          return Promise.resolve();
        };

    window.RTCPeerConnection.prototype.close = function() {
      this.transceivers.forEach(function(transceiver) {
        /* not yet
        if (transceiver.iceGatherer) {
          transceiver.iceGatherer.close();
        }
        */
        if (transceiver.iceTransport) {
          transceiver.iceTransport.stop();
        }
        if (transceiver.dtlsTransport) {
          transceiver.dtlsTransport.stop();
        }
        if (transceiver.rtpSender) {
          transceiver.rtpSender.stop();
        }
        if (transceiver.rtpReceiver) {
          transceiver.rtpReceiver.stop();
        }
      });
      // FIXME: clean up tracks, local streams, remote streams, etc
      this._updateSignalingState('closed');
    };

    // Update the signaling state.
    window.RTCPeerConnection.prototype._updateSignalingState =
        function(newState) {
          this.signalingState = newState;
          var event = new Event('signalingstatechange');
          this.dispatchEvent(event);
          if (this.onsignalingstatechange !== null) {
            this.onsignalingstatechange(event);
          }
        };

    // Determine whether to fire the negotiationneeded event.
    window.RTCPeerConnection.prototype._maybeFireNegotiationNeeded =
        function() {
          // Fire away (for now).
          var event = new Event('negotiationneeded');
          this.dispatchEvent(event);
          if (this.onnegotiationneeded !== null) {
            this.onnegotiationneeded(event);
          }
        };

    // Update the connection state.
    window.RTCPeerConnection.prototype._updateConnectionState = function() {
      var self = this;
      var newState;
      var states = {
        'new': 0,
        closed: 0,
        connecting: 0,
        checking: 0,
        connected: 0,
        completed: 0,
        failed: 0
      };
      this.transceivers.forEach(function(transceiver) {
        states[transceiver.iceTransport.state]++;
        states[transceiver.dtlsTransport.state]++;
      });
      // ICETransport.completed and connected are the same for this purpose.
      states.connected += states.completed;

      newState = 'new';
      if (states.failed > 0) {
        newState = 'failed';
      } else if (states.connecting > 0 || states.checking > 0) {
        newState = 'connecting';
      } else if (states.disconnected > 0) {
        newState = 'disconnected';
      } else if (states.new > 0) {
        newState = 'new';
      } else if (states.connected > 0 || states.completed > 0) {
        newState = 'connected';
      }

      if (newState !== self.iceConnectionState) {
        self.iceConnectionState = newState;
        var event = new Event('iceconnectionstatechange');
        this.dispatchEvent(event);
        if (this.oniceconnectionstatechange !== null) {
          this.oniceconnectionstatechange(event);
        }
      }
    };

    window.RTCPeerConnection.prototype.createOffer = function() {
      var self = this;
      if (this._pendingOffer) {
        throw new Error('createOffer called while there is a pending offer.');
      }
      var offerOptions;
      if (arguments.length === 1 && typeof arguments[0] !== 'function') {
        offerOptions = arguments[0];
      } else if (arguments.length === 3) {
        offerOptions = arguments[2];
      }

      var tracks = [];
      var numAudioTracks = 0;
      var numVideoTracks = 0;
      // Default to sendrecv.
      if (this.localStreams.length) {
        numAudioTracks = this.localStreams[0].getAudioTracks().length;
        numVideoTracks = this.localStreams[0].getVideoTracks().length;
      }
      // Determine number of audio and video tracks we need to send/recv.
      if (offerOptions) {
        // Reject Chrome legacy constraints.
        if (offerOptions.mandatory || offerOptions.optional) {
          throw new TypeError(
              'Legacy mandatory/optional constraints not supported.');
        }
        if (offerOptions.offerToReceiveAudio !== undefined) {
          numAudioTracks = offerOptions.offerToReceiveAudio;
        }
        if (offerOptions.offerToReceiveVideo !== undefined) {
          numVideoTracks = offerOptions.offerToReceiveVideo;
        }
      }
      if (this.localStreams.length) {
        // Push local streams.
        this.localStreams[0].getTracks().forEach(function(track) {
          tracks.push({
            kind: track.kind,
            track: track,
            wantReceive: track.kind === 'audio' ?
                numAudioTracks > 0 : numVideoTracks > 0
          });
          if (track.kind === 'audio') {
            numAudioTracks--;
          } else if (track.kind === 'video') {
            numVideoTracks--;
          }
        });
      }
      // Create M-lines for recvonly streams.
      while (numAudioTracks > 0 || numVideoTracks > 0) {
        if (numAudioTracks > 0) {
          tracks.push({
            kind: 'audio',
            wantReceive: true
          });
          numAudioTracks--;
        }
        if (numVideoTracks > 0) {
          tracks.push({
            kind: 'video',
            wantReceive: true
          });
          numVideoTracks--;
        }
      }

      var sdp = SDPUtils.writeSessionBoilerplate();
      var transceivers = [];
      tracks.forEach(function(mline, sdpMLineIndex) {
        // For each track, create an ice gatherer, ice transport,
        // dtls transport, potentially rtpsender and rtpreceiver.
        var track = mline.track;
        var kind = mline.kind;
        var mid = SDPUtils.generateIdentifier();

        var transports = self.usingBundle && sdpMLineIndex > 0 ? {
          iceGatherer: transceivers[0].iceGatherer,
          iceTransport: transceivers[0].iceTransport,
          dtlsTransport: transceivers[0].dtlsTransport
        } : self._createIceAndDtlsTransports(mid, sdpMLineIndex);

        var localCapabilities = RTCRtpSender.getCapabilities(kind);
        // filter RTX until additional stuff needed for RTX is implemented
        // in adapter.js
        localCapabilities.codecs = localCapabilities.codecs.filter(
            function(codec) {
              return codec.name !== 'rtx';
            });
        localCapabilities.codecs.forEach(function(codec) {
          // work around https://bugs.chromium.org/p/webrtc/issues/detail?id=6552
          // by adding level-asymmetry-allowed=1
          if (codec.name === 'H264' &&
              codec.parameters['level-asymmetry-allowed'] === undefined) {
            codec.parameters['level-asymmetry-allowed'] = '1';
          }
        });

        var rtpSender;
        var rtpReceiver;

        // generate an ssrc now, to be used later in rtpSender.send
        var sendEncodingParameters = [{
          ssrc: (2 * sdpMLineIndex + 1) * 1001
        }];
        if (track) {
          rtpSender = new RTCRtpSender(track, transports.dtlsTransport);
        }

        if (mline.wantReceive) {
          rtpReceiver = new RTCRtpReceiver(transports.dtlsTransport, kind);
        }

        transceivers[sdpMLineIndex] = {
          iceGatherer: transports.iceGatherer,
          iceTransport: transports.iceTransport,
          dtlsTransport: transports.dtlsTransport,
          localCapabilities: localCapabilities,
          remoteCapabilities: null,
          rtpSender: rtpSender,
          rtpReceiver: rtpReceiver,
          kind: kind,
          mid: mid,
          sendEncodingParameters: sendEncodingParameters,
          recvEncodingParameters: null
        };
      });
      if (this.usingBundle) {
        sdp += 'a=group:BUNDLE ' + transceivers.map(function(t) {
          return t.mid;
        }).join(' ') + '\r\n';
      }
      tracks.forEach(function(mline, sdpMLineIndex) {
        var transceiver = transceivers[sdpMLineIndex];
        sdp += SDPUtils.writeMediaSection(transceiver,
            transceiver.localCapabilities, 'offer', self.localStreams[0]);
      });

      this._pendingOffer = transceivers;
      var desc = new RTCSessionDescription({
        type: 'offer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };

    window.RTCPeerConnection.prototype.createAnswer = function() {
      var self = this;

      var sdp = SDPUtils.writeSessionBoilerplate();
      if (this.usingBundle) {
        sdp += 'a=group:BUNDLE ' + this.transceivers.map(function(t) {
          return t.mid;
        }).join(' ') + '\r\n';
      }
      this.transceivers.forEach(function(transceiver) {
        if (transceiver.isDatachannel) {
          sdp += 'm=application 0 DTLS/SCTP 5000\r\n' +
              'c=IN IP4 0.0.0.0\r\n' +
              'a=mid:' + transceiver.mid + '\r\n';
          return;
        }
        // Calculate intersection of capabilities.
        var commonCapabilities = self._getCommonCapabilities(
            transceiver.localCapabilities,
            transceiver.remoteCapabilities);

        sdp += SDPUtils.writeMediaSection(transceiver, commonCapabilities,
            'answer', self.localStreams[0]);
      });

      var desc = new RTCSessionDescription({
        type: 'answer',
        sdp: sdp
      });
      if (arguments.length && typeof arguments[0] === 'function') {
        window.setTimeout(arguments[0], 0, desc);
      }
      return Promise.resolve(desc);
    };

    window.RTCPeerConnection.prototype.addIceCandidate = function(candidate) {
      if (!candidate) {
        this.transceivers.forEach(function(transceiver) {
          transceiver.iceTransport.addRemoteCandidate({});
        });
      } else {
        var mLineIndex = candidate.sdpMLineIndex;
        if (candidate.sdpMid) {
          for (var i = 0; i < this.transceivers.length; i++) {
            if (this.transceivers[i].mid === candidate.sdpMid) {
              mLineIndex = i;
              break;
            }
          }
        }
        var transceiver = this.transceivers[mLineIndex];
        if (transceiver) {
          var cand = Object.keys(candidate.candidate).length > 0 ?
              SDPUtils.parseCandidate(candidate.candidate) : {};
          // Ignore Chrome's invalid candidates since Edge does not like them.
          if (cand.protocol === 'tcp' && (cand.port === 0 || cand.port === 9)) {
            return;
          }
          // Ignore RTCP candidates, we assume RTCP-MUX.
          if (cand.component !== '1') {
            return;
          }
          // A dirty hack to make samples work.
          if (cand.type === 'endOfCandidates') {
            cand = {};
          }
          transceiver.iceTransport.addRemoteCandidate(cand);

          // update the remoteDescription.
          var sections = SDPUtils.splitSections(this.remoteDescription.sdp);
          sections[mLineIndex + 1] += (cand.type ? candidate.candidate.trim()
              : 'a=end-of-candidates') + '\r\n';
          this.remoteDescription.sdp = sections.join('');
        }
      }
      if (arguments.length > 1 && typeof arguments[1] === 'function') {
        window.setTimeout(arguments[1], 0);
      }
      return Promise.resolve();
    };

    window.RTCPeerConnection.prototype.getStats = function() {
      var promises = [];
      this.transceivers.forEach(function(transceiver) {
        ['rtpSender', 'rtpReceiver', 'iceGatherer', 'iceTransport',
            'dtlsTransport'].forEach(function(method) {
              if (transceiver[method]) {
                promises.push(transceiver[method].getStats());
              }
            });
      });
      var cb = arguments.length > 1 && typeof arguments[1] === 'function' &&
          arguments[1];
      return new Promise(function(resolve) {
        // shim getStats with maplike support
        var results = new Map();
        Promise.all(promises).then(function(res) {
          res.forEach(function(result) {
            Object.keys(result).forEach(function(id) {
              results.set(id, result[id]);
              results[id] = result[id];
            });
          });
          if (cb) {
            window.setTimeout(cb, 0, results);
          }
          resolve(results);
        });
      });
    };
  }
};

// Expose public methods.
module.exports = {
  shimPeerConnection: edgeShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils":12,"./getusermedia":8,"sdp":59}],8:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

// Expose public methods.
module.exports = function() {
  var shimError_ = function(e) {
    return {
      name: {PermissionDeniedError: 'NotAllowedError'}[e.name] || e.name,
      message: e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name;
      }
    };
  };

  // getUserMedia error shim.
  var origGetUserMedia = navigator.mediaDevices.getUserMedia.
      bind(navigator.mediaDevices);
  navigator.mediaDevices.getUserMedia = function(c) {
    return origGetUserMedia(c).catch(function(e) {
      return Promise.reject(shimError_(e));
    });
  };
};

},{}],9:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var browserDetails = require('../utils').browserDetails;

var firefoxShim = {
  shimOnTrack: function() {
    if (typeof window === 'object' && window.RTCPeerConnection && !('ontrack' in
        window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'ontrack', {
        get: function() {
          return this._ontrack;
        },
        set: function(f) {
          if (this._ontrack) {
            this.removeEventListener('track', this._ontrack);
            this.removeEventListener('addstream', this._ontrackpoly);
          }
          this.addEventListener('track', this._ontrack = f);
          this.addEventListener('addstream', this._ontrackpoly = function(e) {
            e.stream.getTracks().forEach(function(track) {
              var event = new Event('track');
              event.track = track;
              event.receiver = {track: track};
              event.streams = [e.stream];
              this.dispatchEvent(event);
            }.bind(this));
          }.bind(this));
        }
      });
    }
  },

  shimSourceObject: function() {
    // Firefox has supported mozSrcObject since FF22, unprefixed in 42.
    if (typeof window === 'object') {
      if (window.HTMLMediaElement &&
        !('srcObject' in window.HTMLMediaElement.prototype)) {
        // Shim the srcObject property, once, when HTMLMediaElement is found.
        Object.defineProperty(window.HTMLMediaElement.prototype, 'srcObject', {
          get: function() {
            return this.mozSrcObject;
          },
          set: function(stream) {
            this.mozSrcObject = stream;
          }
        });
      }
    }
  },

  shimPeerConnection: function() {
    if (typeof window !== 'object' || !(window.RTCPeerConnection ||
        window.mozRTCPeerConnection)) {
      return; // probably media.peerconnection.enabled=false in about:config
    }
    // The RTCPeerConnection object.
    if (!window.RTCPeerConnection) {
      window.RTCPeerConnection = function(pcConfig, pcConstraints) {
        if (browserDetails.version < 38) {
          // .urls is not supported in FF < 38.
          // create RTCIceServers with a single url.
          if (pcConfig && pcConfig.iceServers) {
            var newIceServers = [];
            for (var i = 0; i < pcConfig.iceServers.length; i++) {
              var server = pcConfig.iceServers[i];
              if (server.hasOwnProperty('urls')) {
                for (var j = 0; j < server.urls.length; j++) {
                  var newServer = {
                    url: server.urls[j]
                  };
                  if (server.urls[j].indexOf('turn') === 0) {
                    newServer.username = server.username;
                    newServer.credential = server.credential;
                  }
                  newIceServers.push(newServer);
                }
              } else {
                newIceServers.push(pcConfig.iceServers[i]);
              }
            }
            pcConfig.iceServers = newIceServers;
          }
        }
        return new mozRTCPeerConnection(pcConfig, pcConstraints);
      };
      window.RTCPeerConnection.prototype = mozRTCPeerConnection.prototype;

      // wrap static methods. Currently just generateCertificate.
      if (mozRTCPeerConnection.generateCertificate) {
        Object.defineProperty(window.RTCPeerConnection, 'generateCertificate', {
          get: function() {
            return mozRTCPeerConnection.generateCertificate;
          }
        });
      }

      window.RTCSessionDescription = mozRTCSessionDescription;
      window.RTCIceCandidate = mozRTCIceCandidate;
    }

    // shim away need for obsolete RTCIceCandidate/RTCSessionDescription.
    ['setLocalDescription', 'setRemoteDescription', 'addIceCandidate']
        .forEach(function(method) {
          var nativeMethod = RTCPeerConnection.prototype[method];
          RTCPeerConnection.prototype[method] = function() {
            arguments[0] = new ((method === 'addIceCandidate') ?
                RTCIceCandidate : RTCSessionDescription)(arguments[0]);
            return nativeMethod.apply(this, arguments);
          };
        });

    // support for addIceCandidate(null or undefined)
    var nativeAddIceCandidate =
        RTCPeerConnection.prototype.addIceCandidate;
    RTCPeerConnection.prototype.addIceCandidate = function() {
      if (!arguments[0]) {
        if (arguments[1]) {
          arguments[1].apply(null);
        }
        return Promise.resolve();
      }
      return nativeAddIceCandidate.apply(this, arguments);
    };

    if (browserDetails.version < 48) {
      // shim getStats with maplike support
      var makeMapStats = function(stats) {
        var map = new Map();
        Object.keys(stats).forEach(function(key) {
          map.set(key, stats[key]);
          map[key] = stats[key];
        });
        return map;
      };

      var nativeGetStats = RTCPeerConnection.prototype.getStats;
      RTCPeerConnection.prototype.getStats = function(selector, onSucc, onErr) {
        return nativeGetStats.apply(this, [selector || null])
          .then(function(stats) {
            return makeMapStats(stats);
          })
          .then(onSucc, onErr);
      };
    }
  }
};

// Expose public methods.
module.exports = {
  shimOnTrack: firefoxShim.shimOnTrack,
  shimSourceObject: firefoxShim.shimSourceObject,
  shimPeerConnection: firefoxShim.shimPeerConnection,
  shimGetUserMedia: require('./getusermedia')
};

},{"../utils":12,"./getusermedia":10}],10:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var logging = require('../utils').log;
var browserDetails = require('../utils').browserDetails;

// Expose public methods.
module.exports = function() {
  var shimError_ = function(e) {
    return {
      name: {
        SecurityError: 'NotAllowedError',
        PermissionDeniedError: 'NotAllowedError'
      }[e.name] || e.name,
      message: {
        'The operation is insecure.': 'The request is not allowed by the ' +
        'user agent or the platform in the current context.'
      }[e.message] || e.message,
      constraint: e.constraint,
      toString: function() {
        return this.name + (this.message && ': ') + this.message;
      }
    };
  };

  // getUserMedia constraints shim.
  var getUserMedia_ = function(constraints, onSuccess, onError) {
    var constraintsToFF37_ = function(c) {
      if (typeof c !== 'object' || c.require) {
        return c;
      }
      var require = [];
      Object.keys(c).forEach(function(key) {
        if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
          return;
        }
        var r = c[key] = (typeof c[key] === 'object') ?
            c[key] : {ideal: c[key]};
        if (r.min !== undefined ||
            r.max !== undefined || r.exact !== undefined) {
          require.push(key);
        }
        if (r.exact !== undefined) {
          if (typeof r.exact === 'number') {
            r. min = r.max = r.exact;
          } else {
            c[key] = r.exact;
          }
          delete r.exact;
        }
        if (r.ideal !== undefined) {
          c.advanced = c.advanced || [];
          var oc = {};
          if (typeof r.ideal === 'number') {
            oc[key] = {min: r.ideal, max: r.ideal};
          } else {
            oc[key] = r.ideal;
          }
          c.advanced.push(oc);
          delete r.ideal;
          if (!Object.keys(r).length) {
            delete c[key];
          }
        }
      });
      if (require.length) {
        c.require = require;
      }
      return c;
    };
    constraints = JSON.parse(JSON.stringify(constraints));
    if (browserDetails.version < 38) {
      logging('spec: ' + JSON.stringify(constraints));
      if (constraints.audio) {
        constraints.audio = constraintsToFF37_(constraints.audio);
      }
      if (constraints.video) {
        constraints.video = constraintsToFF37_(constraints.video);
      }
      logging('ff37: ' + JSON.stringify(constraints));
    }
    return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {
      onError(shimError_(e));
    });
  };

  // Returns the result of getUserMedia as a Promise.
  var getUserMediaPromise_ = function(constraints) {
    return new Promise(function(resolve, reject) {
      getUserMedia_(constraints, resolve, reject);
    });
  };

  // Shim for mediaDevices on older versions.
  if (!navigator.mediaDevices) {
    navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,
      addEventListener: function() { },
      removeEventListener: function() { }
    };
  }
  navigator.mediaDevices.enumerateDevices =
      navigator.mediaDevices.enumerateDevices || function() {
        return new Promise(function(resolve) {
          var infos = [
            {kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},
            {kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}
          ];
          resolve(infos);
        });
      };

  if (browserDetails.version < 41) {
    // Work around http://bugzil.la/1169665
    var orgEnumerateDevices =
        navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);
    navigator.mediaDevices.enumerateDevices = function() {
      return orgEnumerateDevices().then(undefined, function(e) {
        if (e.name === 'NotFoundError') {
          return [];
        }
        throw e;
      });
    };
  }
  if (browserDetails.version < 49) {
    var origGetUserMedia = navigator.mediaDevices.getUserMedia.
        bind(navigator.mediaDevices);
    navigator.mediaDevices.getUserMedia = function(c) {
      return origGetUserMedia(c).then(function(stream) {
        // Work around https://bugzil.la/802326
        if (c.audio && !stream.getAudioTracks().length ||
            c.video && !stream.getVideoTracks().length) {
          stream.getTracks().forEach(function(track) {
            track.stop();
          });
          throw new DOMException('The object can not be found here.',
                                 'NotFoundError');
        }
        return stream;
      }, function(e) {
        return Promise.reject(shimError_(e));
      });
    };
  }
  navigator.getUserMedia = function(constraints, onSuccess, onError) {
    if (browserDetails.version < 44) {
      return getUserMedia_(constraints, onSuccess, onError);
    }
    // Replace Firefox 44+'s deprecation warning with unprefixed version.
    console.warn('navigator.getUserMedia has been replaced by ' +
                 'navigator.mediaDevices.getUserMedia');
    navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
  };
};

},{"../utils":12}],11:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
'use strict';
var safariShim = {
  // TODO: DrAlex, should be here, double check against LayoutTests
  // shimOnTrack: function() { },

  // TODO: once the back-end for the mac port is done, add.
  // TODO: check for webkitGTK+
  // shimPeerConnection: function() { },

  shimGetUserMedia: function() {
    navigator.getUserMedia = navigator.webkitGetUserMedia;
  }
};

// Expose public methods.
module.exports = {
  shimGetUserMedia: safariShim.shimGetUserMedia
  // TODO
  // shimOnTrack: safariShim.shimOnTrack,
  // shimPeerConnection: safariShim.shimPeerConnection
};

},{}],12:[function(require,module,exports){
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree.
 */
 /* eslint-env node */
'use strict';

var logDisabled_ = true;

// Utility methods.
var utils = {
  disableLog: function(bool) {
    if (typeof bool !== 'boolean') {
      return new Error('Argument type: ' + typeof bool +
          '. Please use a boolean.');
    }
    logDisabled_ = bool;
    return (bool) ? 'adapter.js logging disabled' :
        'adapter.js logging enabled';
  },

  log: function() {
    if (typeof window === 'object') {
      if (logDisabled_) {
        return;
      }
      if (typeof console !== 'undefined' && typeof console.log === 'function') {
        console.log.apply(console, arguments);
      }
    }
  },

  /**
   * Extract browser version out of the provided user agent string.
   *
   * @param {!string} uastring userAgent string.
   * @param {!string} expr Regular expression used as match criteria.
   * @param {!number} pos position in the version string to be returned.
   * @return {!number} browser version.
   */
  extractVersion: function(uastring, expr, pos) {
    var match = uastring.match(expr);
    return match && match.length >= pos && parseInt(match[pos], 10);
  },

  /**
   * Browser detector.
   *
   * @return {object} result containing browser and version
   *     properties.
   */
  detectBrowser: function() {
    // Returned result object.
    var result = {};
    result.browser = null;
    result.version = null;

    // Fail early if it's not a browser
    if (typeof window === 'undefined' || !window.navigator) {
      result.browser = 'Not a browser.';
      return result;
    }

    // Firefox.
    if (navigator.mozGetUserMedia) {
      result.browser = 'firefox';
      result.version = this.extractVersion(navigator.userAgent,
          /Firefox\/([0-9]+)\./, 1);

    // all webkit-based browsers
    } else if (navigator.webkitGetUserMedia) {
      // Chrome, Chromium, Webview, Opera, all use the chrome shim for now
      if (window.webkitRTCPeerConnection) {
        result.browser = 'chrome';
        result.version = this.extractVersion(navigator.userAgent,
          /Chrom(e|ium)\/([0-9]+)\./, 2);

      // Safari or unknown webkit-based
      // for the time being Safari has support for MediaStreams but not webRTC
      } else {
        // Safari UA substrings of interest for reference:
        // - webkit version:           AppleWebKit/602.1.25 (also used in Op,Cr)
        // - safari UI version:        Version/9.0.3 (unique to Safari)
        // - safari UI webkit version: Safari/601.4.4 (also used in Op,Cr)
        //
        // if the webkit version and safari UI webkit versions are equals,
        // ... this is a stable version.
        //
        // only the internal webkit version is important today to know if
        // media streams are supported
        //
        if (navigator.userAgent.match(/Version\/(\d+).(\d+)/)) {
          result.browser = 'safari';
          result.version = this.extractVersion(navigator.userAgent,
            /AppleWebKit\/([0-9]+)\./, 1);

        // unknown webkit-based browser
        } else {
          result.browser = 'Unsupported webkit-based browser ' +
              'with GUM support but no WebRTC support.';
          return result;
        }
      }

    // Edge.
    } else if (navigator.mediaDevices &&
        navigator.userAgent.match(/Edge\/(\d+).(\d+)$/)) {
      result.browser = 'edge';
      result.version = this.extractVersion(navigator.userAgent,
          /Edge\/(\d+).(\d+)$/, 2);

    // Default fallthrough: not supported.
    } else {
      result.browser = 'Not a supported browser.';
      return result;
    }

    return result;
  }
};

// Export.
module.exports = {
  log: utils.log,
  disableLog: utils.disableLog,
  browserDetails: utils.detectBrowser(),
  extractVersion: utils.extractVersion
};

},{}],13:[function(require,module,exports){

/**
 * Expose `Backoff`.
 */

module.exports = Backoff;

/**
 * Initialize backoff timer with `opts`.
 *
 * - `min` initial timeout in milliseconds [100]
 * - `max` max timeout [10000]
 * - `jitter` [0]
 * - `factor` [2]
 *
 * @param {Object} opts
 * @api public
 */

function Backoff(opts) {
  opts = opts || {};
  this.ms = opts.min || 100;
  this.max = opts.max || 10000;
  this.factor = opts.factor || 2;
  this.jitter = opts.jitter > 0 && opts.jitter <= 1 ? opts.jitter : 0;
  this.attempts = 0;
}

/**
 * Return the backoff duration.
 *
 * @return {Number}
 * @api public
 */

Backoff.prototype.duration = function(){
  var ms = this.ms * Math.pow(this.factor, this.attempts++);
  if (this.jitter) {
    var rand =  Math.random();
    var deviation = Math.floor(rand * this.jitter * ms);
    ms = (Math.floor(rand * 10) & 1) == 0  ? ms - deviation : ms + deviation;
  }
  return Math.min(ms, this.max) | 0;
};

/**
 * Reset the number of attempts.
 *
 * @api public
 */

Backoff.prototype.reset = function(){
  this.attempts = 0;
};

/**
 * Set the minimum duration
 *
 * @api public
 */

Backoff.prototype.setMin = function(min){
  this.ms = min;
};

/**
 * Set the maximum duration
 *
 * @api public
 */

Backoff.prototype.setMax = function(max){
  this.max = max;
};

/**
 * Set the jitter
 *
 * @api public
 */

Backoff.prototype.setJitter = function(jitter){
  this.jitter = jitter;
};


},{}],14:[function(require,module,exports){
/*
 * base64-arraybuffer
 * https://github.com/niklasvh/base64-arraybuffer
 *
 * Copyright (c) 2012 Niklas von Hertzen
 * Licensed under the MIT license.
 */
(function(chars){
  "use strict";

  exports.encode = function(arraybuffer) {
    var bytes = new Uint8Array(arraybuffer),
    i, len = bytes.length, base64 = "";

    for (i = 0; i < len; i+=3) {
      base64 += chars[bytes[i] >> 2];
      base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
      base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
      base64 += chars[bytes[i + 2] & 63];
    }

    if ((len % 3) === 2) {
      base64 = base64.substring(0, base64.length - 1) + "=";
    } else if (len % 3 === 1) {
      base64 = base64.substring(0, base64.length - 2) + "==";
    }

    return base64;
  };

  exports.decode =  function(base64) {
    var bufferLength = base64.length * 0.75,
    len = base64.length, i, p = 0,
    encoded1, encoded2, encoded3, encoded4;

    if (base64[base64.length - 1] === "=") {
      bufferLength--;
      if (base64[base64.length - 2] === "=") {
        bufferLength--;
      }
    }

    var arraybuffer = new ArrayBuffer(bufferLength),
    bytes = new Uint8Array(arraybuffer);

    for (i = 0; i < len; i+=4) {
      encoded1 = chars.indexOf(base64[i]);
      encoded2 = chars.indexOf(base64[i+1]);
      encoded3 = chars.indexOf(base64[i+2]);
      encoded4 = chars.indexOf(base64[i+3]);

      bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
      bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
      bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
    }

    return arraybuffer;
  };
})("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");

},{}],15:[function(require,module,exports){
(function (global){
/**
 * Create a blob builder even when vendor prefixes exist
 */

var BlobBuilder = global.BlobBuilder
  || global.WebKitBlobBuilder
  || global.MSBlobBuilder
  || global.MozBlobBuilder;

/**
 * Check if Blob constructor is supported
 */

var blobSupported = (function() {
  try {
    var a = new Blob(['hi']);
    return a.size === 2;
  } catch(e) {
    return false;
  }
})();

/**
 * Check if Blob constructor supports ArrayBufferViews
 * Fails in Safari 6, so we need to map to ArrayBuffers there.
 */

var blobSupportsArrayBufferView = blobSupported && (function() {
  try {
    var b = new Blob([new Uint8Array([1,2])]);
    return b.size === 2;
  } catch(e) {
    return false;
  }
})();

/**
 * Check if BlobBuilder is supported
 */

var blobBuilderSupported = BlobBuilder
  && BlobBuilder.prototype.append
  && BlobBuilder.prototype.getBlob;

/**
 * Helper function that maps ArrayBufferViews to ArrayBuffers
 * Used by BlobBuilder constructor and old browsers that didn't
 * support it in the Blob constructor.
 */

function mapArrayBufferViews(ary) {
  for (var i = 0; i < ary.length; i++) {
    var chunk = ary[i];
    if (chunk.buffer instanceof ArrayBuffer) {
      var buf = chunk.buffer;

      // if this is a subarray, make a copy so we only
      // include the subarray region from the underlying buffer
      if (chunk.byteLength !== buf.byteLength) {
        var copy = new Uint8Array(chunk.byteLength);
        copy.set(new Uint8Array(buf, chunk.byteOffset, chunk.byteLength));
        buf = copy.buffer;
      }

      ary[i] = buf;
    }
  }
}

function BlobBuilderConstructor(ary, options) {
  options = options || {};

  var bb = new BlobBuilder();
  mapArrayBufferViews(ary);

  for (var i = 0; i < ary.length; i++) {
    bb.append(ary[i]);
  }

  return (options.type) ? bb.getBlob(options.type) : bb.getBlob();
};

function BlobConstructor(ary, options) {
  mapArrayBufferViews(ary);
  return new Blob(ary, options || {});
};

module.exports = (function() {
  if (blobSupported) {
    return blobSupportsArrayBufferView ? global.Blob : BlobConstructor;
  } else if (blobBuilderSupported) {
    return BlobBuilderConstructor;
  } else {
    return undefined;
  }
})();

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],16:[function(require,module,exports){
/**
 * Slice reference.
 */

var slice = [].slice;

/**
 * Bind `obj` to `fn`.
 *
 * @param {Object} obj
 * @param {Function|String} fn or string
 * @return {Function}
 * @api public
 */

module.exports = function(obj, fn){
  if ('string' == typeof fn) fn = obj[fn];
  if ('function' != typeof fn) throw new Error('bind() requires a function');
  var args = slice.call(arguments, 2);
  return function(){
    return fn.apply(obj, args.concat(slice.call(arguments)));
  }
};

},{}],17:[function(require,module,exports){

/**
 * Expose `Emitter`.
 */

module.exports = Emitter;

/**
 * Initialize a new `Emitter`.
 *
 * @api public
 */

function Emitter(obj) {
  if (obj) return mixin(obj);
};

/**
 * Mixin the emitter properties.
 *
 * @param {Object} obj
 * @return {Object}
 * @api private
 */

function mixin(obj) {
  for (var key in Emitter.prototype) {
    obj[key] = Emitter.prototype[key];
  }
  return obj;
}

/**
 * Listen on the given `event` with `fn`.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.on =
Emitter.prototype.addEventListener = function(event, fn){
  this._callbacks = this._callbacks || {};
  (this._callbacks[event] = this._callbacks[event] || [])
    .push(fn);
  return this;
};

/**
 * Adds an `event` listener that will be invoked a single
 * time then automatically removed.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.once = function(event, fn){
  var self = this;
  this._callbacks = this._callbacks || {};

  function on() {
    self.off(event, on);
    fn.apply(this, arguments);
  }

  on.fn = fn;
  this.on(event, on);
  return this;
};

/**
 * Remove the given callback for `event` or all
 * registered callbacks.
 *
 * @param {String} event
 * @param {Function} fn
 * @return {Emitter}
 * @api public
 */

Emitter.prototype.off =
Emitter.prototype.removeListener =
Emitter.prototype.removeAllListeners =
Emitter.prototype.removeEventListener = function(event, fn){
  this._callbacks = this._callbacks || {};

  // all
  if (0 == arguments.length) {
    this._callbacks = {};
    return this;
  }

  // specific event
  var callbacks = this._callbacks[event];
  if (!callbacks) return this;

  // remove all handlers
  if (1 == arguments.length) {
    delete this._callbacks[event];
    return this;
  }

  // remove specific handler
  var cb;
  for (var i = 0; i < callbacks.length; i++) {
    cb = callbacks[i];
    if (cb === fn || cb.fn === fn) {
      callbacks.splice(i, 1);
      break;
    }
  }
  return this;
};

/**
 * Emit `event` with the given args.
 *
 * @param {String} event
 * @param {Mixed} ...
 * @return {Emitter}
 */

Emitter.prototype.emit = function(event){
  this._callbacks = this._callbacks || {};
  var args = [].slice.call(arguments, 1)
    , callbacks = this._callbacks[event];

  if (callbacks) {
    callbacks = callbacks.slice(0);
    for (var i = 0, len = callbacks.length; i < len; ++i) {
      callbacks[i].apply(this, args);
    }
  }

  return this;
};

/**
 * Return array of callbacks for `event`.
 *
 * @param {String} event
 * @return {Array}
 * @api public
 */

Emitter.prototype.listeners = function(event){
  this._callbacks = this._callbacks || {};
  return this._callbacks[event] || [];
};

/**
 * Check if this emitter has `event` handlers.
 *
 * @param {String} event
 * @return {Boolean}
 * @api public
 */

Emitter.prototype.hasListeners = function(event){
  return !! this.listeners(event).length;
};

},{}],18:[function(require,module,exports){

module.exports = function(a, b){
  var fn = function(){};
  fn.prototype = b.prototype;
  a.prototype = new fn;
  a.prototype.constructor = a;
};
},{}],19:[function(require,module,exports){

/**
 * Expose `debug()` as the module.
 */

module.exports = debug;

/**
 * Create a debugger with the given `name`.
 *
 * @param {String} name
 * @return {Type}
 * @api public
 */

function debug(name) {
  if (!debug.enabled(name)) return function(){};

  return function(fmt){
    fmt = coerce(fmt);

    var curr = new Date;
    var ms = curr - (debug[name] || curr);
    debug[name] = curr;

    fmt = name
      + ' '
      + fmt
      + ' +' + debug.humanize(ms);

    // This hackery is required for IE8
    // where `console.log` doesn't have 'apply'
    window.console
      && console.log
      && Function.prototype.apply.call(console.log, console, arguments);
  }
}

/**
 * The currently active debug mode names.
 */

debug.names = [];
debug.skips = [];

/**
 * Enables a debug mode by name. This can include modes
 * separated by a colon and wildcards.
 *
 * @param {String} name
 * @api public
 */

debug.enable = function(name) {
  try {
    localStorage.debug = name;
  } catch(e){}

  var split = (name || '').split(/[\s,]+/)
    , len = split.length;

  for (var i = 0; i < len; i++) {
    name = split[i].replace('*', '.*?');
    if (name[0] === '-') {
      debug.skips.push(new RegExp('^' + name.substr(1) + '$'));
    }
    else {
      debug.names.push(new RegExp('^' + name + '$'));
    }
  }
};

/**
 * Disable debug output.
 *
 * @api public
 */

debug.disable = function(){
  debug.enable('');
};

/**
 * Humanize the given `ms`.
 *
 * @param {Number} m
 * @return {String}
 * @api private
 */

debug.humanize = function(ms) {
  var sec = 1000
    , min = 60 * 1000
    , hour = 60 * min;

  if (ms >= hour) return (ms / hour).toFixed(1) + 'h';
  if (ms >= min) return (ms / min).toFixed(1) + 'm';
  if (ms >= sec) return (ms / sec | 0) + 's';
  return ms + 'ms';
};

/**
 * Returns true if the given mode name is enabled, false otherwise.
 *
 * @param {String} name
 * @return {Boolean}
 * @api public
 */

debug.enabled = function(name) {
  for (var i = 0, len = debug.skips.length; i < len; i++) {
    if (debug.skips[i].test(name)) {
      return false;
    }
  }
  for (var i = 0, len = debug.names.length; i < len; i++) {
    if (debug.names[i].test(name)) {
      return true;
    }
  }
  return false;
};

/**
 * Coerce `val`.
 */

function coerce(val) {
  if (val instanceof Error) return val.stack || val.message;
  return val;
}

// persist

try {
  if (window.localStorage) debug.enable(localStorage.debug);
} catch(e){}

},{}],20:[function(require,module,exports){

module.exports =  require('./lib/');

},{"./lib/":21}],21:[function(require,module,exports){

module.exports = require('./socket');

/**
 * Exports parser
 *
 * @api public
 *
 */
module.exports.parser = require('engine.io-parser');

},{"./socket":22,"engine.io-parser":33}],22:[function(require,module,exports){
(function (global){
/**
 * Module dependencies.
 */

var transports = require('./transports');
var Emitter = require('component-emitter');
var debug = require('debug')('engine.io-client:socket');
var index = require('indexof');
var parser = require('engine.io-parser');
var parseuri = require('parseuri');
var parsejson = require('parsejson');
var parseqs = require('parseqs');

/**
 * Module exports.
 */

module.exports = Socket;

/**
 * Noop function.
 *
 * @api private
 */

function noop(){}

/**
 * Socket constructor.
 *
 * @param {String|Object} uri or options
 * @param {Object} options
 * @api public
 */

function Socket(uri, opts){
  if (!(this instanceof Socket)) return new Socket(uri, opts);

  opts = opts || {};

  if (uri && 'object' == typeof uri) {
    opts = uri;
    uri = null;
  }

  if (uri) {
    uri = parseuri(uri);
    opts.host = uri.host;
    opts.secure = uri.protocol == 'https' || uri.protocol == 'wss';
    opts.port = uri.port;
    if (uri.query) opts.query = uri.query;
  }

  this.secure = null != opts.secure ? opts.secure :
    (global.location && 'https:' == location.protocol);

  if (opts.host) {
    var pieces = opts.host.split(':');
    opts.hostname = pieces.shift();
    if (pieces.length) {
      opts.port = pieces.pop();
    } else if (!opts.port) {
      // if no port is specified manually, use the protocol default
      opts.port = this.secure ? '443' : '80';
    }
  }

  this.agent = opts.agent || false;
  this.hostname = opts.hostname ||
    (global.location ? location.hostname : 'localhost');
  this.port = opts.port || (global.location && location.port ?
       location.port :
       (this.secure ? 443 : 80));
  this.query = opts.query || {};
  if ('string' == typeof this.query) this.query = parseqs.decode(this.query);
  this.upgrade = false !== opts.upgrade;
  this.path = (opts.path || '/engine.io').replace(/\/$/, '') + '/';
  this.forceJSONP = !!opts.forceJSONP;
  this.jsonp = false !== opts.jsonp;
  this.forceBase64 = !!opts.forceBase64;
  this.enablesXDR = !!opts.enablesXDR;
  this.timestampParam = opts.timestampParam || 't';
  this.timestampRequests = opts.timestampRequests;
  this.transports = opts.transports || ['polling', 'websocket'];
  this.readyState = '';
  this.writeBuffer = [];
  this.callbackBuffer = [];
  this.policyPort = opts.policyPort || 843;
  this.rememberUpgrade = opts.rememberUpgrade || false;
  this.binaryType = null;
  this.onlyBinaryUpgrades = opts.onlyBinaryUpgrades;

  // SSL options for Node.js client
  this.pfx = opts.pfx || null;
  this.key = opts.key || null;
  this.passphrase = opts.passphrase || null;
  this.cert = opts.cert || null;
  this.ca = opts.ca || null;
  this.ciphers = opts.ciphers || null;
  this.rejectUnauthorized = opts.rejectUnauthorized || null;

  this.open();
}

Socket.priorWebsocketSuccess = false;

/**
 * Mix in `Emitter`.
 */

Emitter(Socket.prototype);

/**
 * Protocol version.
 *
 * @api public
 */

Socket.protocol = parser.protocol; // this is an int

/**
 * Expose deps for legacy compatibility
 * and standalone browser access.
 */

Socket.Socket = Socket;
Socket.Transport = require('./transport');
Socket.transports = require('./transports');
Socket.parser = require('engine.io-parser');

/**
 * Creates transport of the given type.
 *
 * @param {String} transport name
 * @return {Transport}
 * @api private
 */

Socket.prototype.createTransport = function (name) {
  debug('creating transport "%s"', name);
  var query = clone(this.query);

  // append engine.io protocol identifier
  query.EIO = parser.protocol;

  // transport name
  query.transport = name;

  // session id if we already have one
  if (this.id) query.sid = this.id;

  var transport = new transports[name]({
    agent: this.agent,
    hostname: this.hostname,
    port: this.port,
    secure: this.secure,
    path: this.path,
    query: query,
    forceJSONP: this.forceJSONP,
    jsonp: this.jsonp,
    forceBase64: this.forceBase64,
    enablesXDR: this.enablesXDR,
    timestampRequests: this.timestampRequests,
    timestampParam: this.timestampParam,
    policyPort: this.policyPort,
    socket: this,
    pfx: this.pfx,
    key: this.key,
    passphrase: this.passphrase,
    cert: this.cert,
    ca: this.ca,
    ciphers: this.ciphers,
    rejectUnauthorized: this.rejectUnauthorized
  });

  return transport;
};

function clone (obj) {
  var o = {};
  for (var i in obj) {
    if (obj.hasOwnProperty(i)) {
      o[i] = obj[i];
    }
  }
  return o;
}

/**
 * Initializes transport to use and starts probe.
 *
 * @api private
 */
Socket.prototype.open = function () {
  var transport;
  if (this.rememberUpgrade && Socket.priorWebsocketSuccess && this.transports.indexOf('websocket') != -1) {
    transport = 'websocket';
  } else if (0 == this.transports.length) {
    // Emit error on next tick so it can be listened to
    var self = this;
    setTimeout(function() {
      self.emit('error', 'No transports available');
    }, 0);
    return;
  } else {
    transport = this.transports[0];
  }
  this.readyState = 'opening';

  // Retry with the next transport if the transport is disabled (jsonp: false)
  var transport;
  try {
    transport = this.createTransport(transport);
  } catch (e) {
    this.transports.shift();
    this.open();
    return;
  }

  transport.open();
  this.setTransport(transport);
};

/**
 * Sets the current transport. Disables the existing one (if any).
 *
 * @api private
 */

Socket.prototype.setTransport = function(transport){
  debug('setting transport %s', transport.name);
  var self = this;

  if (this.transport) {
    debug('clearing existing transport %s', this.transport.name);
    this.transport.removeAllListeners();
  }

  // set up transport
  this.transport = transport;

  // set up transport listeners
  transport
  .on('drain', function(){
    self.onDrain();
  })
  .on('packet', function(packet){
    self.onPacket(packet);
  })
  .on('error', function(e){
    self.onError(e);
  })
  .on('close', function(){
    self.onClose('transport close');
  });
};

/**
 * Probes a transport.
 *
 * @param {String} transport name
 * @api private
 */

Socket.prototype.probe = function (name) {
  debug('probing transport "%s"', name);
  var transport = this.createTransport(name, { probe: 1 })
    , failed = false
    , self = this;

  Socket.priorWebsocketSuccess = false;

  function onTransportOpen(){
    if (self.onlyBinaryUpgrades) {
      var upgradeLosesBinary = !this.supportsBinary && self.transport.supportsBinary;
      failed = failed || upgradeLosesBinary;
    }
    if (failed) return;

    debug('probe transport "%s" opened', name);
    transport.send([{ type: 'ping', data: 'probe' }]);
    transport.once('packet', function (msg) {
      if (failed) return;
      if ('pong' == msg.type && 'probe' == msg.data) {
        debug('probe transport "%s" pong', name);
        self.upgrading = true;
        self.emit('upgrading', transport);
        if (!transport) return;
        Socket.priorWebsocketSuccess = 'websocket' == transport.name;

        debug('pausing current transport "%s"', self.transport.name);
        self.transport.pause(function () {
          if (failed) return;
          if ('closed' == self.readyState) return;
          debug('changing transport and sending upgrade packet');

          cleanup();

          self.setTransport(transport);
          transport.send([{ type: 'upgrade' }]);
          self.emit('upgrade', transport);
          transport = null;
          self.upgrading = false;
          self.flush();
        });
      } else {
        debug('probe transport "%s" failed', name);
        var err = new Error('probe error');
        err.transport = transport.name;
        self.emit('upgradeError', err);
      }
    });
  }

  function freezeTransport() {
    if (failed) return;

    // Any callback called by transport should be ignored since now
    failed = true;

    cleanup();

    transport.close();
    transport = null;
  }

  //Handle any error that happens while probing
  function onerror(err) {
    var error = new Error('probe error: ' + err);
    error.transport = transport.name;

    freezeTransport();

    debug('probe transport "%s" failed because of error: %s', name, err);

    self.emit('upgradeError', error);
  }

  function onTransportClose(){
    onerror("transport closed");
  }

  //When the socket is closed while we're probing
  function onclose(){
    onerror("socket closed");
  }

  //When the socket is upgraded while we're probing
  function onupgrade(to){
    if (transport && to.name != transport.name) {
      debug('"%s" works - aborting "%s"', to.name, transport.name);
      freezeTransport();
    }
  }

  //Remove all listeners on the transport and on self
  function cleanup(){
    transport.removeListener('open', onTransportOpen);
    transport.removeListener('error', onerror);
    transport.removeListener('close', onTransportClose);
    self.removeListener('close', onclose);
    self.removeListener('upgrading', onupgrade);
  }

  transport.once('open', onTransportOpen);
  transport.once('error', onerror);
  transport.once('close', onTransportClose);

  this.once('close', onclose);
  this.once('upgrading', onupgrade);

  transport.open();

};

/**
 * Called when connection is deemed open.
 *
 * @api public
 */

Socket.prototype.onOpen = function () {
  debug('socket open');
  this.readyState = 'open';
  Socket.priorWebsocketSuccess = 'websocket' == this.transport.name;
  this.emit('open');
  this.flush();

  // we check for `readyState` in case an `open`
  // listener already closed the socket
  if ('open' == this.readyState && this.upgrade && this.transport.pause) {
    debug('starting upgrade probes');
    for (var i = 0, l = this.upgrades.length; i < l; i++) {
      this.probe(this.upgrades[i]);
    }
  }
};

/**
 * Handles a packet.
 *
 * @api private
 */

Socket.prototype.onPacket = function (packet) {
  if ('opening' == this.readyState || 'open' == this.readyState) {
    debug('socket receive: type "%s", data "%s"', packet.type, packet.data);

    this.emit('packet', packet);

    // Socket is live - any packet counts
    this.emit('heartbeat');

    switch (packet.type) {
      case 'open':
        this.onHandshake(parsejson(packet.data));
        break;

      case 'pong':
        this.setPing();
        break;

      case 'error':
        var err = new Error('server error');
        err.code = packet.data;
        this.emit('error', err);
        break;

      case 'message':
        this.emit('data', packet.data);
        this.emit('message', packet.data);
        break;
    }
  } else {
    debug('packet received with socket readyState "%s"', this.readyState);
  }
};

/**
 * Called upon handshake completion.
 *
 * @param {Object} handshake obj
 * @api private
 */

Socket.prototype.onHandshake = function (data) {
  this.emit('handshake', data);
  this.id = data.sid;
  this.transport.query.sid = data.sid;
  this.upgrades = this.filterUpgrades(data.upgrades);
  this.pingInterval = data.pingInterval;
  this.pingTimeout = data.pingTimeout;
  this.onOpen();
  // In case open handler closes socket
  if  ('closed' == this.readyState) return;
  this.setPing();

  // Prolong liveness of socket on heartbeat
  this.removeListener('heartbeat', this.onHeartbeat);
  this.on('heartbeat', this.onHeartbeat);
};

/**
 * Resets ping timeout.
 *
 * @api private
 */

Socket.prototype.onHeartbeat = function (timeout) {
  clearTimeout(this.pingTimeoutTimer);
  var self = this;
  self.pingTimeoutTimer = setTimeout(function () {
    if ('closed' == self.readyState) return;
    self.onClose('ping timeout');
  }, timeout || (self.pingInterval + self.pingTimeout));
};

/**
 * Pings server every `this.pingInterval` and expects response
 * within `this.pingTimeout` or closes connection.
 *
 * @api private
 */

Socket.prototype.setPing = function () {
  var self = this;
  clearTimeout(self.pingIntervalTimer);
  self.pingIntervalTimer = setTimeout(function () {
    debug('writing ping packet - expecting pong within %sms', self.pingTimeout);
    self.ping();
    self.onHeartbeat(self.pingTimeout);
  }, self.pingInterval);
};

/**
* Sends a ping packet.
*
* @api public
*/

Socket.prototype.ping = function () {
  this.sendPacket('ping');
};

/**
 * Called on `drain` event
 *
 * @api private
 */

Socket.prototype.onDrain = function() {
  for (var i = 0; i < this.prevBufferLen; i++) {
    if (this.callbackBuffer[i]) {
      this.callbackBuffer[i]();
    }
  }

  this.writeBuffer.splice(0, this.prevBufferLen);
  this.callbackBuffer.splice(0, this.prevBufferLen);

  // setting prevBufferLen = 0 is very important
  // for example, when upgrading, upgrade packet is sent over,
  // and a nonzero prevBufferLen could cause problems on `drain`
  this.prevBufferLen = 0;

  if (this.writeBuffer.length == 0) {
    this.emit('drain');
  } else {
    this.flush();
  }
};

/**
 * Flush write buffers.
 *
 * @api private
 */

Socket.prototype.flush = function () {
  if ('closed' != this.readyState && this.transport.writable &&
    !this.upgrading && this.writeBuffer.length) {
    debug('flushing %d packets in socket', this.writeBuffer.length);
    this.transport.send(this.writeBuffer);
    // keep track of current length of writeBuffer
    // splice writeBuffer and callbackBuffer on `drain`
    this.prevBufferLen = this.writeBuffer.length;
    this.emit('flush');
  }
};

/**
 * Sends a message.
 *
 * @param {String} message.
 * @param {Function} callback function.
 * @return {Socket} for chaining.
 * @api public
 */

Socket.prototype.write =
Socket.prototype.send = function (msg, fn) {
  this.sendPacket('message', msg, fn);
  return this;
};

/**
 * Sends a packet.
 *
 * @param {String} packet type.
 * @param {String} data.
 * @param {Function} callback function.
 * @api private
 */

Socket.prototype.sendPacket = function (type, data, fn) {
  if ('closing' == this.readyState || 'closed' == this.readyState) {
    return;
  }

  var packet = { type: type, data: data };
  this.emit('packetCreate', packet);
  this.writeBuffer.push(packet);
  this.callbackBuffer.push(fn);
  this.flush();
};

/**
 * Closes the connection.
 *
 * @api private
 */

Socket.prototype.close = function () {
  if ('opening' == this.readyState || 'open' == this.readyState) {
    this.readyState = 'closing';

    var self = this;

    function close() {
      self.onClose('forced close');
      debug('socket closing - telling transport to close');
      self.transport.close();
    }

    function cleanupAndClose() {
      self.removeListener('upgrade', cleanupAndClose);
      self.removeListener('upgradeError', cleanupAndClose);
      close();
    }

    function waitForUpgrade() {
      // wait for upgrade to finish since we can't send packets while pausing a transport
      self.once('upgrade', cleanupAndClose);
      self.once('upgradeError', cleanupAndClose);
    }

    if (this.writeBuffer.length) {
      this.once('drain', function() {
        if (this.upgrading) {
          waitForUpgrade();
        } else {
          close();
        }
      });
    } else if (this.upgrading) {
      waitForUpgrade();
    } else {
      close();
    }
  }

  return this;
};

/**
 * Called upon transport error
 *
 * @api private
 */

Socket.prototype.onError = function (err) {
  debug('socket error %j', err);
  Socket.priorWebsocketSuccess = false;
  this.emit('error', err);
  this.onClose('transport error', err);
};

/**
 * Called upon transport close.
 *
 * @api private
 */

Socket.prototype.onClose = function (reason, desc) {
  if ('opening' == this.readyState || 'open' == this.readyState || 'closing' == this.readyState) {
    debug('socket close with reason: "%s"', reason);
    var self = this;

    // clear timers
    clearTimeout(this.pingIntervalTimer);
    clearTimeout(this.pingTimeoutTimer);

    // clean buffers in next tick, so developers can still
    // grab the buffers on `close` event
    setTimeout(function() {
      self.writeBuffer = [];
      self.callbackBuffer = [];
      self.prevBufferLen = 0;
    }, 0);

    // stop event from firing again for transport
    this.transport.removeAllListeners('close');

    // ensure transport won't stay open
    this.transport.close();

    // ignore further transport communication
    this.transport.removeAllListeners();

    // set ready state
    this.readyState = 'closed';

    // clear session id
    this.id = null;

    // emit close event
    this.emit('close', reason, desc);
  }
};

/**
 * Filters upgrades, returning only those matching client transports.
 *
 * @param {Array} server upgrades
 * @api private
 *
 */

Socket.prototype.filterUpgrades = function (upgrades) {
  var filteredUpgrades = [];
  for (var i = 0, j = upgrades.length; i<j; i++) {
    if (~index(this.transports, upgrades[i])) filteredUpgrades.push(upgrades[i]);
  }
  return filteredUpgrades;
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./transport":23,"./transports":24,"component-emitter":17,"debug":30,"engine.io-parser":33,"indexof":41,"parsejson":49,"parseqs":50,"parseuri":32}],23:[function(require,module,exports){
/**
 * Module dependencies.
 */

var parser = require('engine.io-parser');
var Emitter = require('component-emitter');

/**
 * Module exports.
 */

module.exports = Transport;

/**
 * Transport abstract constructor.
 *
 * @param {Object} options.
 * @api private
 */

function Transport (opts) {
  this.path = opts.path;
  this.hostname = opts.hostname;
  this.port = opts.port;
  this.secure = opts.secure;
  this.query = opts.query;
  this.timestampParam = opts.timestampParam;
  this.timestampRequests = opts.timestampRequests;
  this.readyState = '';
  this.agent = opts.agent || false;
  this.socket = opts.socket;
  this.enablesXDR = opts.enablesXDR;

  // SSL options for Node.js client
  this.pfx = opts.pfx;
  this.key = opts.key;
  this.passphrase = opts.passphrase;
  this.cert = opts.cert;
  this.ca = opts.ca;
  this.ciphers = opts.ciphers;
  this.rejectUnauthorized = opts.rejectUnauthorized;
}

/**
 * Mix in `Emitter`.
 */

Emitter(Transport.prototype);

/**
 * A counter used to prevent collisions in the timestamps used
 * for cache busting.
 */

Transport.timestamps = 0;

/**
 * Emits an error.
 *
 * @param {String} str
 * @return {Transport} for chaining
 * @api public
 */

Transport.prototype.onError = function (msg, desc) {
  var err = new Error(msg);
  err.type = 'TransportError';
  err.description = desc;
  this.emit('error', err);
  return this;
};

/**
 * Opens the transport.
 *
 * @api public
 */

Transport.prototype.open = function () {
  if ('closed' == this.readyState || '' == this.readyState) {
    this.readyState = 'opening';
    this.doOpen();
  }

  return this;
};

/**
 * Closes the transport.
 *
 * @api private
 */

Transport.prototype.close = function () {
  if ('opening' == this.readyState || 'open' == this.readyState) {
    this.doClose();
    this.onClose();
  }

  return this;
};

/**
 * Sends multiple packets.
 *
 * @param {Array} packets
 * @api private
 */

Transport.prototype.send = function(packets){
  if ('open' == this.readyState) {
    this.write(packets);
  } else {
    throw new Error('Transport not open');
  }
};

/**
 * Called upon open
 *
 * @api private
 */

Transport.prototype.onOpen = function () {
  this.readyState = 'open';
  this.writable = true;
  this.emit('open');
};

/**
 * Called with data.
 *
 * @param {String} data
 * @api private
 */

Transport.prototype.onData = function(data){
  var packet = parser.decodePacket(data, this.socket.binaryType);
  this.onPacket(packet);
};

/**
 * Called with a decoded packet.
 */

Transport.prototype.onPacket = function (packet) {
  this.emit('packet', packet);
};

/**
 * Called upon close.
 *
 * @api private
 */

Transport.prototype.onClose = function () {
  this.readyState = 'closed';
  this.emit('close');
};

},{"component-emitter":17,"engine.io-parser":33}],24:[function(require,module,exports){
(function (global){
/**
 * Module dependencies
 */

var XMLHttpRequest = require('xmlhttprequest');
var XHR = require('./polling-xhr');
var JSONP = require('./polling-jsonp');
var websocket = require('./websocket');

/**
 * Export transports.
 */

exports.polling = polling;
exports.websocket = websocket;

/**
 * Polling transport polymorphic constructor.
 * Decides on xhr vs jsonp based on feature detection.
 *
 * @api private
 */

function polling(opts){
  var xhr;
  var xd = false;
  var xs = false;
  var jsonp = false !== opts.jsonp;

  if (global.location) {
    var isSSL = 'https:' == location.protocol;
    var port = location.port;

    // some user agents have empty `location.port`
    if (!port) {
      port = isSSL ? 443 : 80;
    }

    xd = opts.hostname != location.hostname || port != opts.port;
    xs = opts.secure != isSSL;
  }

  opts.xdomain = xd;
  opts.xscheme = xs;
  xhr = new XMLHttpRequest(opts);

  if ('open' in xhr && !opts.forceJSONP) {
    return new XHR(opts);
  } else {
    if (!jsonp) throw new Error('JSONP disabled');
    return new JSONP(opts);
  }
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling-jsonp":25,"./polling-xhr":26,"./websocket":28,"xmlhttprequest":29}],25:[function(require,module,exports){
(function (global){

/**
 * Module requirements.
 */

var Polling = require('./polling');
var inherit = require('component-inherit');

/**
 * Module exports.
 */

module.exports = JSONPPolling;

/**
 * Cached regular expressions.
 */

var rNewline = /\n/g;
var rEscapedNewline = /\\n/g;

/**
 * Global JSONP callbacks.
 */

var callbacks;

/**
 * Callbacks count.
 */

var index = 0;

/**
 * Noop.
 */

function empty () { }

/**
 * JSONP Polling constructor.
 *
 * @param {Object} opts.
 * @api public
 */

function JSONPPolling (opts) {
  Polling.call(this, opts);

  this.query = this.query || {};

  // define global callbacks array if not present
  // we do this here (lazily) to avoid unneeded global pollution
  if (!callbacks) {
    // we need to consider multiple engines in the same page
    if (!global.___eio) global.___eio = [];
    callbacks = global.___eio;
  }

  // callback identifier
  this.index = callbacks.length;

  // add callback to jsonp global
  var self = this;
  callbacks.push(function (msg) {
    self.onData(msg);
  });

  // append to query string
  this.query.j = this.index;

  // prevent spurious errors from being emitted when the window is unloaded
  if (global.document && global.addEventListener) {
    global.addEventListener('beforeunload', function () {
      if (self.script) self.script.onerror = empty;
    }, false);
  }
}

/**
 * Inherits from Polling.
 */

inherit(JSONPPolling, Polling);

/*
 * JSONP only supports binary as base64 encoded strings
 */

JSONPPolling.prototype.supportsBinary = false;

/**
 * Closes the socket.
 *
 * @api private
 */

JSONPPolling.prototype.doClose = function () {
  if (this.script) {
    this.script.parentNode.removeChild(this.script);
    this.script = null;
  }

  if (this.form) {
    this.form.parentNode.removeChild(this.form);
    this.form = null;
    this.iframe = null;
  }

  Polling.prototype.doClose.call(this);
};

/**
 * Starts a poll cycle.
 *
 * @api private
 */

JSONPPolling.prototype.doPoll = function () {
  var self = this;
  var script = document.createElement('script');

  if (this.script) {
    this.script.parentNode.removeChild(this.script);
    this.script = null;
  }

  script.async = true;
  script.src = this.uri();
  script.onerror = function(e){
    self.onError('jsonp poll error',e);
  };

  var insertAt = document.getElementsByTagName('script')[0];
  insertAt.parentNode.insertBefore(script, insertAt);
  this.script = script;

  var isUAgecko = 'undefined' != typeof navigator && /gecko/i.test(navigator.userAgent);
  
  if (isUAgecko) {
    setTimeout(function () {
      var iframe = document.createElement('iframe');
      document.body.appendChild(iframe);
      document.body.removeChild(iframe);
    }, 100);
  }
};

/**
 * Writes with a hidden iframe.
 *
 * @param {String} data to send
 * @param {Function} called upon flush.
 * @api private
 */

JSONPPolling.prototype.doWrite = function (data, fn) {
  var self = this;

  if (!this.form) {
    var form = document.createElement('form');
    var area = document.createElement('textarea');
    var id = this.iframeId = 'eio_iframe_' + this.index;
    var iframe;

    form.className = 'socketio';
    form.style.position = 'absolute';
    form.style.top = '-1000px';
    form.style.left = '-1000px';
    form.target = id;
    form.method = 'POST';
    form.setAttribute('accept-charset', 'utf-8');
    area.name = 'd';
    form.appendChild(area);
    document.body.appendChild(form);

    this.form = form;
    this.area = area;
  }

  this.form.action = this.uri();

  function complete () {
    initIframe();
    fn();
  }

  function initIframe () {
    if (self.iframe) {
      try {
        self.form.removeChild(self.iframe);
      } catch (e) {
        self.onError('jsonp polling iframe removal error', e);
      }
    }

    try {
      // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
      var html = '<iframe src="javascript:0" name="'+ self.iframeId +'">';
      iframe = document.createElement(html);
    } catch (e) {
      iframe = document.createElement('iframe');
      iframe.name = self.iframeId;
      iframe.src = 'javascript:0';
    }

    iframe.id = self.iframeId;

    self.form.appendChild(iframe);
    self.iframe = iframe;
  }

  initIframe();

  // escape \n to prevent it from being converted into \r\n by some UAs
  // double escaping is required for escaped new lines because unescaping of new lines can be done safely on server-side
  data = data.replace(rEscapedNewline, '\\\n');
  this.area.value = data.replace(rNewline, '\\n');

  try {
    this.form.submit();
  } catch(e) {}

  if (this.iframe.attachEvent) {
    this.iframe.onreadystatechange = function(){
      if (self.iframe.readyState == 'complete') {
        complete();
      }
    };
  } else {
    this.iframe.onload = complete;
  }
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling":27,"component-inherit":18}],26:[function(require,module,exports){
(function (global){
/**
 * Module requirements.
 */

var XMLHttpRequest = require('xmlhttprequest');
var Polling = require('./polling');
var Emitter = require('component-emitter');
var inherit = require('component-inherit');
var debug = require('debug')('engine.io-client:polling-xhr');

/**
 * Module exports.
 */

module.exports = XHR;
module.exports.Request = Request;

/**
 * Empty function
 */

function empty(){}

/**
 * XHR Polling constructor.
 *
 * @param {Object} opts
 * @api public
 */

function XHR(opts){
  Polling.call(this, opts);

  if (global.location) {
    var isSSL = 'https:' == location.protocol;
    var port = location.port;

    // some user agents have empty `location.port`
    if (!port) {
      port = isSSL ? 443 : 80;
    }

    this.xd = opts.hostname != global.location.hostname ||
      port != opts.port;
    this.xs = opts.secure != isSSL;
  }
}

/**
 * Inherits from Polling.
 */

inherit(XHR, Polling);

/**
 * XHR supports binary
 */

XHR.prototype.supportsBinary = true;

/**
 * Creates a request.
 *
 * @param {String} method
 * @api private
 */

XHR.prototype.request = function(opts){
  opts = opts || {};
  opts.uri = this.uri();
  opts.xd = this.xd;
  opts.xs = this.xs;
  opts.agent = this.agent || false;
  opts.supportsBinary = this.supportsBinary;
  opts.enablesXDR = this.enablesXDR;

  // SSL options for Node.js client
  opts.pfx = this.pfx;
  opts.key = this.key;
  opts.passphrase = this.passphrase;
  opts.cert = this.cert;
  opts.ca = this.ca;
  opts.ciphers = this.ciphers;
  opts.rejectUnauthorized = this.rejectUnauthorized;

  return new Request(opts);
};

/**
 * Sends data.
 *
 * @param {String} data to send.
 * @param {Function} called upon flush.
 * @api private
 */

XHR.prototype.doWrite = function(data, fn){
  var isBinary = typeof data !== 'string' && data !== undefined;
  var req = this.request({ method: 'POST', data: data, isBinary: isBinary });
  var self = this;
  req.on('success', fn);
  req.on('error', function(err){
    self.onError('xhr post error', err);
  });
  this.sendXhr = req;
};

/**
 * Starts a poll cycle.
 *
 * @api private
 */

XHR.prototype.doPoll = function(){
  debug('xhr poll');
  var req = this.request();
  var self = this;
  req.on('data', function(data){
    self.onData(data);
  });
  req.on('error', function(err){
    self.onError('xhr poll error', err);
  });
  this.pollXhr = req;
};

/**
 * Request constructor
 *
 * @param {Object} options
 * @api public
 */

function Request(opts){
  this.method = opts.method || 'GET';
  this.uri = opts.uri;
  this.xd = !!opts.xd;
  this.xs = !!opts.xs;
  this.async = false !== opts.async;
  this.data = undefined != opts.data ? opts.data : null;
  this.agent = opts.agent;
  this.isBinary = opts.isBinary;
  this.supportsBinary = opts.supportsBinary;
  this.enablesXDR = opts.enablesXDR;

  // SSL options for Node.js client
  this.pfx = opts.pfx;
  this.key = opts.key;
  this.passphrase = opts.passphrase;
  this.cert = opts.cert;
  this.ca = opts.ca;
  this.ciphers = opts.ciphers;
  this.rejectUnauthorized = opts.rejectUnauthorized;

  this.create();
}

/**
 * Mix in `Emitter`.
 */

Emitter(Request.prototype);

/**
 * Creates the XHR object and sends the request.
 *
 * @api private
 */

Request.prototype.create = function(){
  var opts = { agent: this.agent, xdomain: this.xd, xscheme: this.xs, enablesXDR: this.enablesXDR };

  // SSL options for Node.js client
  opts.pfx = this.pfx;
  opts.key = this.key;
  opts.passphrase = this.passphrase;
  opts.cert = this.cert;
  opts.ca = this.ca;
  opts.ciphers = this.ciphers;
  opts.rejectUnauthorized = this.rejectUnauthorized;

  var xhr = this.xhr = new XMLHttpRequest(opts);
  var self = this;

  try {
    debug('xhr open %s: %s', this.method, this.uri);
    xhr.open(this.method, this.uri, this.async);
    if (this.supportsBinary) {
      // This has to be done after open because Firefox is stupid
      // http://stackoverflow.com/questions/13216903/get-binary-data-with-xmlhttprequest-in-a-firefox-extension
      xhr.responseType = 'arraybuffer';
    }

    if ('POST' == this.method) {
      try {
        if (this.isBinary) {
          xhr.setRequestHeader('Content-type', 'application/octet-stream');
        } else {
          xhr.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
        }
      } catch (e) {}
    }

    // ie6 check
    if ('withCredentials' in xhr) {
      xhr.withCredentials = true;
    }

    if (this.hasXDR()) {
      xhr.onload = function(){
        self.onLoad();
      };
      xhr.onerror = function(){
        self.onError(xhr.responseText);
      };
    } else {
      xhr.onreadystatechange = function(){
        if (4 != xhr.readyState) return;
        if (200 == xhr.status || 1223 == xhr.status) {
          self.onLoad();
        } else {
          // make sure the `error` event handler that's user-set
          // does not throw in the same tick and gets caught here
          setTimeout(function(){
            self.onError(xhr.status);
          }, 0);
        }
      };
    }

    debug('xhr data %s', this.data);
    xhr.send(this.data);
  } catch (e) {
    // Need to defer since .create() is called directly fhrom the constructor
    // and thus the 'error' event can only be only bound *after* this exception
    // occurs.  Therefore, also, we cannot throw here at all.
    setTimeout(function() {
      self.onError(e);
    }, 0);
    return;
  }

  if (global.document) {
    this.index = Request.requestsCount++;
    Request.requests[this.index] = this;
  }
};

/**
 * Called upon successful response.
 *
 * @api private
 */

Request.prototype.onSuccess = function(){
  this.emit('success');
  this.cleanup();
};

/**
 * Called if we have data.
 *
 * @api private
 */

Request.prototype.onData = function(data){
  this.emit('data', data);
  this.onSuccess();
};

/**
 * Called upon error.
 *
 * @api private
 */

Request.prototype.onError = function(err){
  this.emit('error', err);
  this.cleanup(true);
};

/**
 * Cleans up house.
 *
 * @api private
 */

Request.prototype.cleanup = function(fromError){
  if ('undefined' == typeof this.xhr || null === this.xhr) {
    return;
  }
  // xmlhttprequest
  if (this.hasXDR()) {
    this.xhr.onload = this.xhr.onerror = empty;
  } else {
    this.xhr.onreadystatechange = empty;
  }

  if (fromError) {
    try {
      this.xhr.abort();
    } catch(e) {}
  }

  if (global.document) {
    delete Request.requests[this.index];
  }

  this.xhr = null;
};

/**
 * Called upon load.
 *
 * @api private
 */

Request.prototype.onLoad = function(){
  var data;
  try {
    var contentType;
    try {
      contentType = this.xhr.getResponseHeader('Content-Type').split(';')[0];
    } catch (e) {}
    if (contentType === 'application/octet-stream') {
      data = this.xhr.response;
    } else {
      if (!this.supportsBinary) {
        data = this.xhr.responseText;
      } else {
        data = 'ok';
      }
    }
  } catch (e) {
    this.onError(e);
  }
  if (null != data) {
    this.onData(data);
  }
};

/**
 * Check if it has XDomainRequest.
 *
 * @api private
 */

Request.prototype.hasXDR = function(){
  return 'undefined' !== typeof global.XDomainRequest && !this.xs && this.enablesXDR;
};

/**
 * Aborts the request.
 *
 * @api public
 */

Request.prototype.abort = function(){
  this.cleanup();
};

/**
 * Aborts pending requests when unloading the window. This is needed to prevent
 * memory leaks (e.g. when using IE) and to ensure that no spurious error is
 * emitted.
 */

if (global.document) {
  Request.requestsCount = 0;
  Request.requests = {};
  if (global.attachEvent) {
    global.attachEvent('onunload', unloadHandler);
  } else if (global.addEventListener) {
    global.addEventListener('beforeunload', unloadHandler, false);
  }
}

function unloadHandler() {
  for (var i in Request.requests) {
    if (Request.requests.hasOwnProperty(i)) {
      Request.requests[i].abort();
    }
  }
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./polling":27,"component-emitter":17,"component-inherit":18,"debug":30,"xmlhttprequest":29}],27:[function(require,module,exports){
/**
 * Module dependencies.
 */

var Transport = require('../transport');
var parseqs = require('parseqs');
var parser = require('engine.io-parser');
var inherit = require('component-inherit');
var debug = require('debug')('engine.io-client:polling');

/**
 * Module exports.
 */

module.exports = Polling;

/**
 * Is XHR2 supported?
 */

var hasXHR2 = (function() {
  var XMLHttpRequest = require('xmlhttprequest');
  var xhr = new XMLHttpRequest({ xdomain: false });
  return null != xhr.responseType;
})();

/**
 * Polling interface.
 *
 * @param {Object} opts
 * @api private
 */

function Polling(opts){
  var forceBase64 = (opts && opts.forceBase64);
  if (!hasXHR2 || forceBase64) {
    this.supportsBinary = false;
  }
  Transport.call(this, opts);
}

/**
 * Inherits from Transport.
 */

inherit(Polling, Transport);

/**
 * Transport name.
 */

Polling.prototype.name = 'polling';

/**
 * Opens the socket (triggers polling). We write a PING message to determine
 * when the transport is open.
 *
 * @api private
 */

Polling.prototype.doOpen = function(){
  this.poll();
};

/**
 * Pauses polling.
 *
 * @param {Function} callback upon buffers are flushed and transport is paused
 * @api private
 */

Polling.prototype.pause = function(onPause){
  var pending = 0;
  var self = this;

  this.readyState = 'pausing';

  function pause(){
    debug('paused');
    self.readyState = 'paused';
    onPause();
  }

  if (this.polling || !this.writable) {
    var total = 0;

    if (this.polling) {
      debug('we are currently polling - waiting to pause');
      total++;
      this.once('pollComplete', function(){
        debug('pre-pause polling complete');
        --total || pause();
      });
    }

    if (!this.writable) {
      debug('we are currently writing - waiting to pause');
      total++;
      this.once('drain', function(){
        debug('pre-pause writing complete');
        --total || pause();
      });
    }
  } else {
    pause();
  }
};

/**
 * Starts polling cycle.
 *
 * @api public
 */

Polling.prototype.poll = function(){
  debug('polling');
  this.polling = true;
  this.doPoll();
  this.emit('poll');
};

/**
 * Overloads onData to detect payloads.
 *
 * @api private
 */

Polling.prototype.onData = function(data){
  var self = this;
  debug('polling got data %s', data);
  var callback = function(packet, index, total) {
    // if its the first message we consider the transport open
    if ('opening' == self.readyState) {
      self.onOpen();
    }

    // if its a close packet, we close the ongoing requests
    if ('close' == packet.type) {
      self.onClose();
      return false;
    }

    // otherwise bypass onData and handle the message
    self.onPacket(packet);
  };

  // decode payload
  parser.decodePayload(data, this.socket.binaryType, callback);

  // if an event did not trigger closing
  if ('closed' != this.readyState) {
    // if we got data we're not polling
    this.polling = false;
    this.emit('pollComplete');

    if ('open' == this.readyState) {
      this.poll();
    } else {
      debug('ignoring poll - transport state "%s"', this.readyState);
    }
  }
};

/**
 * For polling, send a close packet.
 *
 * @api private
 */

Polling.prototype.doClose = function(){
  var self = this;

  function close(){
    debug('writing close packet');
    self.write([{ type: 'close' }]);
  }

  if ('open' == this.readyState) {
    debug('transport open - closing');
    close();
  } else {
    // in case we're trying to close while
    // handshaking is in progress (GH-164)
    debug('transport not open - deferring close');
    this.once('open', close);
  }
};

/**
 * Writes a packets payload.
 *
 * @param {Array} data packets
 * @param {Function} drain callback
 * @api private
 */

Polling.prototype.write = function(packets){
  var self = this;
  this.writable = false;
  var callbackfn = function() {
    self.writable = true;
    self.emit('drain');
  };

  var self = this;
  parser.encodePayload(packets, this.supportsBinary, function(data) {
    self.doWrite(data, callbackfn);
  });
};

/**
 * Generates uri for connection.
 *
 * @api private
 */

Polling.prototype.uri = function(){
  var query = this.query || {};
  var schema = this.secure ? 'https' : 'http';
  var port = '';

  // cache busting is forced
  if (false !== this.timestampRequests) {
    query[this.timestampParam] = +new Date + '-' + Transport.timestamps++;
  }

  if (!this.supportsBinary && !query.sid) {
    query.b64 = 1;
  }

  query = parseqs.encode(query);

  // avoid port if default for schema
  if (this.port && (('https' == schema && this.port != 443) ||
     ('http' == schema && this.port != 80))) {
    port = ':' + this.port;
  }

  // prepend ? to query
  if (query.length) {
    query = '?' + query;
  }

  return schema + '://' + this.hostname + port + this.path + query;
};

},{"../transport":23,"component-inherit":18,"debug":30,"engine.io-parser":33,"parseqs":50,"xmlhttprequest":29}],28:[function(require,module,exports){
/**
 * Module dependencies.
 */

var Transport = require('../transport');
var parser = require('engine.io-parser');
var parseqs = require('parseqs');
var inherit = require('component-inherit');
var debug = require('debug')('engine.io-client:websocket');

/**
 * `ws` exposes a WebSocket-compatible interface in
 * Node, or the `WebSocket` or `MozWebSocket` globals
 * in the browser.
 */

var WebSocket = require('ws');

/**
 * Module exports.
 */

module.exports = WS;

/**
 * WebSocket transport constructor.
 *
 * @api {Object} connection options
 * @api public
 */

function WS(opts){
  var forceBase64 = (opts && opts.forceBase64);
  if (forceBase64) {
    this.supportsBinary = false;
  }
  Transport.call(this, opts);
}

/**
 * Inherits from Transport.
 */

inherit(WS, Transport);

/**
 * Transport name.
 *
 * @api public
 */

WS.prototype.name = 'websocket';

/*
 * WebSockets support binary
 */

WS.prototype.supportsBinary = true;

/**
 * Opens socket.
 *
 * @api private
 */

WS.prototype.doOpen = function(){
  if (!this.check()) {
    // let probe timeout
    return;
  }

  var self = this;
  var uri = this.uri();
  var protocols = void(0);
  var opts = { agent: this.agent };

  // SSL options for Node.js client
  opts.pfx = this.pfx;
  opts.key = this.key;
  opts.passphrase = this.passphrase;
  opts.cert = this.cert;
  opts.ca = this.ca;
  opts.ciphers = this.ciphers;
  opts.rejectUnauthorized = this.rejectUnauthorized;

  this.ws = new WebSocket(uri, protocols, opts);

  if (this.ws.binaryType === undefined) {
    this.supportsBinary = false;
  }

  this.ws.binaryType = 'arraybuffer';
  this.addEventListeners();
};

/**
 * Adds event listeners to the socket
 *
 * @api private
 */

WS.prototype.addEventListeners = function(){
  var self = this;

  this.ws.onopen = function(){
    self.onOpen();
  };
  this.ws.onclose = function(){
    self.onClose();
  };
  this.ws.onmessage = function(ev){
    self.onData(ev.data);
  };
  this.ws.onerror = function(e){
    self.onError('websocket error', e);
  };
};

/**
 * Override `onData` to use a timer on iOS.
 * See: https://gist.github.com/mloughran/2052006
 *
 * @api private
 */

if ('undefined' != typeof navigator
  && /iPad|iPhone|iPod/i.test(navigator.userAgent)) {
  WS.prototype.onData = function(data){
    var self = this;
    setTimeout(function(){
      Transport.prototype.onData.call(self, data);
    }, 0);
  };
}

/**
 * Writes data to socket.
 *
 * @param {Array} array of packets.
 * @api private
 */

WS.prototype.write = function(packets){
  var self = this;
  this.writable = false;
  // encodePacket efficient as it uses WS framing
  // no need for encodePayload
  for (var i = 0, l = packets.length; i < l; i++) {
    parser.encodePacket(packets[i], this.supportsBinary, function(data) {
      //Sometimes the websocket has already been closed but the browser didn't
      //have a chance of informing us about it yet, in that case send will
      //throw an error
      try {
        self.ws.send(data);
      } catch (e){
        debug('websocket closed before onclose event');
      }
    });
  }

  function ondrain() {
    self.writable = true;
    self.emit('drain');
  }
  // fake drain
  // defer to next tick to allow Socket to clear writeBuffer
  setTimeout(ondrain, 0);
};

/**
 * Called upon close
 *
 * @api private
 */

WS.prototype.onClose = function(){
  Transport.prototype.onClose.call(this);
};

/**
 * Closes socket.
 *
 * @api private
 */

WS.prototype.doClose = function(){
  if (typeof this.ws !== 'undefined') {
    this.ws.close();
  }
};

/**
 * Generates uri for connection.
 *
 * @api private
 */

WS.prototype.uri = function(){
  var query = this.query || {};
  var schema = this.secure ? 'wss' : 'ws';
  var port = '';

  // avoid port if default for schema
  if (this.port && (('wss' == schema && this.port != 443)
    || ('ws' == schema && this.port != 80))) {
    port = ':' + this.port;
  }

  // append timestamp to URI
  if (this.timestampRequests) {
    query[this.timestampParam] = +new Date;
  }

  // communicate binary support capabilities
  if (!this.supportsBinary) {
    query.b64 = 1;
  }

  query = parseqs.encode(query);

  // prepend ? to query
  if (query.length) {
    query = '?' + query;
  }

  return schema + '://' + this.hostname + port + this.path + query;
};

/**
 * Feature detection for WebSocket.
 *
 * @return {Boolean} whether this transport is available.
 * @api public
 */

WS.prototype.check = function(){
  return !!WebSocket && !('__initialize' in WebSocket && this.name === WS.prototype.name);
};

},{"../transport":23,"component-inherit":18,"debug":30,"engine.io-parser":33,"parseqs":50,"ws":76}],29:[function(require,module,exports){
// browser shim for xmlhttprequest module
var hasCORS = require('has-cors');

module.exports = function(opts) {
  var xdomain = opts.xdomain;

  // scheme must be same when usign XDomainRequest
  // http://blogs.msdn.com/b/ieinternals/archive/2010/05/13/xdomainrequest-restrictions-limitations-and-workarounds.aspx
  var xscheme = opts.xscheme;

  // XDomainRequest has a flow of not sending cookie, therefore it should be disabled as a default.
  // https://github.com/Automattic/engine.io-client/pull/217
  var enablesXDR = opts.enablesXDR;

  // XMLHttpRequest can be disabled on IE
  try {
    if ('undefined' != typeof XMLHttpRequest && (!xdomain || hasCORS)) {
      return new XMLHttpRequest();
    }
  } catch (e) { }

  // Use XDomainRequest for IE8 if enablesXDR is true
  // because loading bar keeps flashing when using jsonp-polling
  // https://github.com/yujiosaka/socke.io-ie8-loading-example
  try {
    if ('undefined' != typeof XDomainRequest && !xscheme && enablesXDR) {
      return new XDomainRequest();
    }
  } catch (e) { }

  if (!xdomain) {
    try {
      return new ActiveXObject('Microsoft.XMLHTTP');
    } catch(e) { }
  }
}

},{"has-cors":40}],30:[function(require,module,exports){

/**
 * This is the web browser implementation of `debug()`.
 *
 * Expose `debug()` as the module.
 */

exports = module.exports = require('./debug');
exports.log = log;
exports.formatArgs = formatArgs;
exports.save = save;
exports.load = load;
exports.useColors = useColors;

/**
 * Colors.
 */

exports.colors = [
  'lightseagreen',
  'forestgreen',
  'goldenrod',
  'dodgerblue',
  'darkorchid',
  'crimson'
];

/**
 * Currently only WebKit-based Web Inspectors, Firefox >= v31,
 * and the Firebug extension (any Firefox version) are known
 * to support "%c" CSS customizations.
 *
 * TODO: add a `localStorage` variable to explicitly enable/disable colors
 */

function useColors() {
  // is webkit? http://stackoverflow.com/a/16459606/376773
  return ('WebkitAppearance' in document.documentElement.style) ||
    // is firebug? http://stackoverflow.com/a/398120/376773
    (window.console && (console.firebug || (console.exception && console.table))) ||
    // is firefox >= v31?
    // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
    (navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31);
}

/**
 * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
 */

exports.formatters.j = function(v) {
  return JSON.stringify(v);
};


/**
 * Colorize log arguments if enabled.
 *
 * @api public
 */

function formatArgs() {
  var args = arguments;
  var useColors = this.useColors;

  args[0] = (useColors ? '%c' : '')
    + this.namespace
    + (useColors ? ' %c' : ' ')
    + args[0]
    + (useColors ? '%c ' : ' ')
    + '+' + exports.humanize(this.diff);

  if (!useColors) return args;

  var c = 'color: ' + this.color;
  args = [args[0], c, 'color: inherit'].concat(Array.prototype.slice.call(args, 1));

  // the final "%c" is somewhat tricky, because there could be other
  // arguments passed either before or after the %c, so we need to
  // figure out the correct index to insert the CSS into
  var index = 0;
  var lastC = 0;
  args[0].replace(/%[a-z%]/g, function(match) {
    if ('%%' === match) return;
    index++;
    if ('%c' === match) {
      // we only are interested in the *last* %c
      // (the user may have provided their own)
      lastC = index;
    }
  });

  args.splice(lastC, 0, c);
  return args;
}

/**
 * Invokes `console.log()` when available.
 * No-op when `console.log` is not a "function".
 *
 * @api public
 */

function log() {
  // This hackery is required for IE8,
  // where the `console.log` function doesn't have 'apply'
  return 'object' == typeof console
    && 'function' == typeof console.log
    && Function.prototype.apply.call(console.log, console, arguments);
}

/**
 * Save `namespaces`.
 *
 * @param {String} namespaces
 * @api private
 */

function save(namespaces) {
  try {
    if (null == namespaces) {
      localStorage.removeItem('debug');
    } else {
      localStorage.debug = namespaces;
    }
  } catch(e) {}
}

/**
 * Load `namespaces`.
 *
 * @return {String} returns the previously persisted debug modes
 * @api private
 */

function load() {
  var r;
  try {
    r = localStorage.debug;
  } catch(e) {}
  return r;
}

/**
 * Enable namespaces listed in `localStorage.debug` initially.
 */

exports.enable(load());

},{"./debug":31}],31:[function(require,module,exports){

/**
 * This is the common logic for both the Node.js and web browser
 * implementations of `debug()`.
 *
 * Expose `debug()` as the module.
 */

exports = module.exports = debug;
exports.coerce = coerce;
exports.disable = disable;
exports.enable = enable;
exports.enabled = enabled;
exports.humanize = require('ms');

/**
 * The currently active debug mode names, and names to skip.
 */

exports.names = [];
exports.skips = [];

/**
 * Map of special "%n" handling functions, for the debug "format" argument.
 *
 * Valid key names are a single, lowercased letter, i.e. "n".
 */

exports.formatters = {};

/**
 * Previously assigned color.
 */

var prevColor = 0;

/**
 * Previous log timestamp.
 */

var prevTime;

/**
 * Select a color.
 *
 * @return {Number}
 * @api private
 */

function selectColor() {
  return exports.colors[prevColor++ % exports.colors.length];
}

/**
 * Create a debugger with the given `namespace`.
 *
 * @param {String} namespace
 * @return {Function}
 * @api public
 */

function debug(namespace) {

  // define the `disabled` version
  function disabled() {
  }
  disabled.enabled = false;

  // define the `enabled` version
  function enabled() {

    var self = enabled;

    // set `diff` timestamp
    var curr = +new Date();
    var ms = curr - (prevTime || curr);
    self.diff = ms;
    self.prev = prevTime;
    self.curr = curr;
    prevTime = curr;

    // add the `color` if not set
    if (null == self.useColors) self.useColors = exports.useColors();
    if (null == self.color && self.useColors) self.color = selectColor();

    var args = Array.prototype.slice.call(arguments);

    args[0] = exports.coerce(args[0]);

    if ('string' !== typeof args[0]) {
      // anything else let's inspect with %o
      args = ['%o'].concat(args);
    }

    // apply any `formatters` transformations
    var index = 0;
    args[0] = args[0].replace(/%([a-z%])/g, function(match, format) {
      // if we encounter an escaped % then don't increase the array index
      if (match === '%%') return match;
      index++;
      var formatter = exports.formatters[format];
      if ('function' === typeof formatter) {
        var val = args[index];
        match = formatter.call(self, val);

        // now we need to remove `args[index]` since it's inlined in the `format`
        args.splice(index, 1);
        index--;
      }
      return match;
    });

    if ('function' === typeof exports.formatArgs) {
      args = exports.formatArgs.apply(self, args);
    }
    var logFn = enabled.log || exports.log || console.log.bind(console);
    logFn.apply(self, args);
  }
  enabled.enabled = true;

  var fn = exports.enabled(namespace) ? enabled : disabled;

  fn.namespace = namespace;

  return fn;
}

/**
 * Enables a debug mode by namespaces. This can include modes
 * separated by a colon and wildcards.
 *
 * @param {String} namespaces
 * @api public
 */

function enable(namespaces) {
  exports.save(namespaces);

  var split = (namespaces || '').split(/[\s,]+/);
  var len = split.length;

  for (var i = 0; i < len; i++) {
    if (!split[i]) continue; // ignore empty strings
    namespaces = split[i].replace(/\*/g, '.*?');
    if (namespaces[0] === '-') {
      exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
    } else {
      exports.names.push(new RegExp('^' + namespaces + '$'));
    }
  }
}

/**
 * Disable debug output.
 *
 * @api public
 */

function disable() {
  exports.enable('');
}

/**
 * Returns true if the given mode name is enabled, false otherwise.
 *
 * @param {String} name
 * @return {Boolean}
 * @api public
 */

function enabled(name) {
  var i, len;
  for (i = 0, len = exports.skips.length; i < len; i++) {
    if (exports.skips[i].test(name)) {
      return false;
    }
  }
  for (i = 0, len = exports.names.length; i < len; i++) {
    if (exports.names[i].test(name)) {
      return true;
    }
  }
  return false;
}

/**
 * Coerce `val`.
 *
 * @param {Mixed} val
 * @return {Mixed}
 * @api private
 */

function coerce(val) {
  if (val instanceof Error) return val.stack || val.message;
  return val;
}

},{"ms":47}],32:[function(require,module,exports){
/**
 * Parses an URI
 *
 * @author Steven Levithan <stevenlevithan.com> (MIT license)
 * @api private
 */

var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;

var parts = [
    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host', 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'
];

module.exports = function parseuri(str) {
    var src = str,
        b = str.indexOf('['),
        e = str.indexOf(']');

    if (b != -1 && e != -1) {
        str = str.substring(0, b) + str.substring(b, e).replace(/:/g, ';') + str.substring(e, str.length);
    }

    var m = re.exec(str || ''),
        uri = {},
        i = 14;

    while (i--) {
        uri[parts[i]] = m[i] || '';
    }

    if (b != -1 && e != -1) {
        uri.source = src;
        uri.host = uri.host.substring(1, uri.host.length - 1).replace(/;/g, ':');
        uri.authority = uri.authority.replace('[', '').replace(']', '').replace(/;/g, ':');
        uri.ipv6uri = true;
    }

    return uri;
};

},{}],33:[function(require,module,exports){
(function (global){
/**
 * Module dependencies.
 */

var keys = require('./keys');
var hasBinary = require('has-binary');
var sliceBuffer = require('arraybuffer.slice');
var base64encoder = require('base64-arraybuffer');
var after = require('after');
var utf8 = require('utf8');

/**
 * Check if we are running an android browser. That requires us to use
 * ArrayBuffer with polling transports...
 *
 * http://ghinda.net/jpeg-blob-ajax-android/
 */

var isAndroid = navigator.userAgent.match(/Android/i);

/**
 * Check if we are running in PhantomJS.
 * Uploading a Blob with PhantomJS does not work correctly, as reported here:
 * https://github.com/ariya/phantomjs/issues/11395
 * @type boolean
 */
var isPhantomJS = /PhantomJS/i.test(navigator.userAgent);

/**
 * When true, avoids using Blobs to encode payloads.
 * @type boolean
 */
var dontSendBlobs = isAndroid || isPhantomJS;

/**
 * Current protocol version.
 */

exports.protocol = 3;

/**
 * Packet types.
 */

var packets = exports.packets = {
    open:     0    // non-ws
  , close:    1    // non-ws
  , ping:     2
  , pong:     3
  , message:  4
  , upgrade:  5
  , noop:     6
};

var packetslist = keys(packets);

/**
 * Premade error packet.
 */

var err = { type: 'error', data: 'parser error' };

/**
 * Create a blob api even for blob builder when vendor prefixes exist
 */

var Blob = require('blob');

/**
 * Encodes a packet.
 *
 *     <packet type id> [ <data> ]
 *
 * Example:
 *
 *     5hello world
 *     3
 *     4
 *
 * Binary is encoded in an identical principle
 *
 * @api private
 */

exports.encodePacket = function (packet, supportsBinary, utf8encode, callback) {
  if ('function' == typeof supportsBinary) {
    callback = supportsBinary;
    supportsBinary = false;
  }

  if ('function' == typeof utf8encode) {
    callback = utf8encode;
    utf8encode = null;
  }

  var data = (packet.data === undefined)
    ? undefined
    : packet.data.buffer || packet.data;

  if (global.ArrayBuffer && data instanceof ArrayBuffer) {
    return encodeArrayBuffer(packet, supportsBinary, callback);
  } else if (Blob && data instanceof global.Blob) {
    return encodeBlob(packet, supportsBinary, callback);
  }

  // might be an object with { base64: true, data: dataAsBase64String }
  if (data && data.base64) {
    return encodeBase64Object(packet, callback);
  }

  // Sending data as a utf-8 string
  var encoded = packets[packet.type];

  // data fragment is optional
  if (undefined !== packet.data) {
    encoded += utf8encode ? utf8.encode(String(packet.data)) : String(packet.data);
  }

  return callback('' + encoded);

};

function encodeBase64Object(packet, callback) {
  // packet data is an object { base64: true, data: dataAsBase64String }
  var message = 'b' + exports.packets[packet.type] + packet.data.data;
  return callback(message);
}

/**
 * Encode packet helpers for binary types
 */

function encodeArrayBuffer(packet, supportsBinary, callback) {
  if (!supportsBinary) {
    return exports.encodeBase64Packet(packet, callback);
  }

  var data = packet.data;
  var contentArray = new Uint8Array(data);
  var resultBuffer = new Uint8Array(1 + data.byteLength);

  resultBuffer[0] = packets[packet.type];
  for (var i = 0; i < contentArray.length; i++) {
    resultBuffer[i+1] = contentArray[i];
  }

  return callback(resultBuffer.buffer);
}

function encodeBlobAsArrayBuffer(packet, supportsBinary, callback) {
  if (!supportsBinary) {
    return exports.encodeBase64Packet(packet, callback);
  }

  var fr = new FileReader();
  fr.onload = function() {
    packet.data = fr.result;
    exports.encodePacket(packet, supportsBinary, true, callback);
  };
  return fr.readAsArrayBuffer(packet.data);
}

function encodeBlob(packet, supportsBinary, callback) {
  if (!supportsBinary) {
    return exports.encodeBase64Packet(packet, callback);
  }

  if (dontSendBlobs) {
    return encodeBlobAsArrayBuffer(packet, supportsBinary, callback);
  }

  var length = new Uint8Array(1);
  length[0] = packets[packet.type];
  var blob = new Blob([length.buffer, packet.data]);

  return callback(blob);
}

/**
 * Encodes a packet with binary data in a base64 string
 *
 * @param {Object} packet, has `type` and `data`
 * @return {String} base64 encoded message
 */

exports.encodeBase64Packet = function(packet, callback) {
  var message = 'b' + exports.packets[packet.type];
  if (Blob && packet.data instanceof Blob) {
    var fr = new FileReader();
    fr.onload = function() {
      var b64 = fr.result.split(',')[1];
      callback(message + b64);
    };
    return fr.readAsDataURL(packet.data);
  }

  var b64data;
  try {
    b64data = String.fromCharCode.apply(null, new Uint8Array(packet.data));
  } catch (e) {
    // iPhone Safari doesn't let you apply with typed arrays
    var typed = new Uint8Array(packet.data);
    var basic = new Array(typed.length);
    for (var i = 0; i < typed.length; i++) {
      basic[i] = typed[i];
    }
    b64data = String.fromCharCode.apply(null, basic);
  }
  message += global.btoa(b64data);
  return callback(message);
};

/**
 * Decodes a packet. Changes format to Blob if requested.
 *
 * @return {Object} with `type` and `data` (if any)
 * @api private
 */

exports.decodePacket = function (data, binaryType, utf8decode) {
  // String data
  if (typeof data == 'string' || data === undefined) {
    if (data.charAt(0) == 'b') {
      return exports.decodeBase64Packet(data.substr(1), binaryType);
    }

    if (utf8decode) {
      try {
        data = utf8.decode(data);
      } catch (e) {
        return err;
      }
    }
    var type = data.charAt(0);

    if (Number(type) != type || !packetslist[type]) {
      return err;
    }

    if (data.length > 1) {
      return { type: packetslist[type], data: data.substring(1) };
    } else {
      return { type: packetslist[type] };
    }
  }

  var asArray = new Uint8Array(data);
  var type = asArray[0];
  var rest = sliceBuffer(data, 1);
  if (Blob && binaryType === 'blob') {
    rest = new Blob([rest]);
  }
  return { type: packetslist[type], data: rest };
};

/**
 * Decodes a packet encoded in a base64 string
 *
 * @param {String} base64 encoded message
 * @return {Object} with `type` and `data` (if any)
 */

exports.decodeBase64Packet = function(msg, binaryType) {
  var type = packetslist[msg.charAt(0)];
  if (!global.ArrayBuffer) {
    return { type: type, data: { base64: true, data: msg.substr(1) } };
  }

  var data = base64encoder.decode(msg.substr(1));

  if (binaryType === 'blob' && Blob) {
    data = new Blob([data]);
  }

  return { type: type, data: data };
};

/**
 * Encodes multiple messages (payload).
 *
 *     <length>:data
 *
 * Example:
 *
 *     11:hello world2:hi
 *
 * If any contents are binary, they will be encoded as base64 strings. Base64
 * encoded strings are marked with a b before the length specifier
 *
 * @param {Array} packets
 * @api private
 */

exports.encodePayload = function (packets, supportsBinary, callback) {
  if (typeof supportsBinary == 'function') {
    callback = supportsBinary;
    supportsBinary = null;
  }

  var isBinary = hasBinary(packets);

  if (supportsBinary && isBinary) {
    if (Blob && !dontSendBlobs) {
      return exports.encodePayloadAsBlob(packets, callback);
    }

    return exports.encodePayloadAsArrayBuffer(packets, callback);
  }

  if (!packets.length) {
    return callback('0:');
  }

  function setLengthHeader(message) {
    return message.length + ':' + message;
  }

  function encodeOne(packet, doneCallback) {
    exports.encodePacket(packet, !isBinary ? false : supportsBinary, true, function(message) {
      doneCallback(null, setLengthHeader(message));
    });
  }

  map(packets, encodeOne, function(err, results) {
    return callback(results.join(''));
  });
};

/**
 * Async array map using after
 */

function map(ary, each, done) {
  var result = new Array(ary.length);
  var next = after(ary.length, done);

  var eachWithIndex = function(i, el, cb) {
    each(el, function(error, msg) {
      result[i] = msg;
      cb(error, result);
    });
  };

  for (var i = 0; i < ary.length; i++) {
    eachWithIndex(i, ary[i], next);
  }
}

/*
 * Decodes data when a payload is maybe expected. Possible binary contents are
 * decoded from their base64 representation
 *
 * @param {String} data, callback method
 * @api public
 */

exports.decodePayload = function (data, binaryType, callback) {
  if (typeof data != 'string') {
    return exports.decodePayloadAsBinary(data, binaryType, callback);
  }

  if (typeof binaryType === 'function') {
    callback = binaryType;
    binaryType = null;
  }

  var packet;
  if (data == '') {
    // parser error - ignoring payload
    return callback(err, 0, 1);
  }

  var length = ''
    , n, msg;

  for (var i = 0, l = data.length; i < l; i++) {
    var chr = data.charAt(i);

    if (':' != chr) {
      length += chr;
    } else {
      if ('' == length || (length != (n = Number(length)))) {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }

      msg = data.substr(i + 1, n);

      if (length != msg.length) {
        // parser error - ignoring payload
        return callback(err, 0, 1);
      }

      if (msg.length) {
        packet = exports.decodePacket(msg, binaryType, true);

        if (err.type == packet.type && err.data == packet.data) {
          // parser error in individual packet - ignoring payload
          return callback(err, 0, 1);
        }

        var ret = callback(packet, i + n, l);
        if (false === ret) return;
      }

      // advance cursor
      i += n;
      length = '';
    }
  }

  if (length != '') {
    // parser error - ignoring payload
    return callback(err, 0, 1);
  }

};

/**
 * Encodes multiple messages (payload) as binary.
 *
 * <1 = binary, 0 = string><number from 0-9><number from 0-9>[...]<number
 * 255><data>
 *
 * Example:
 * 1 3 255 1 2 3, if the binary contents are interpreted as 8 bit integers
 *
 * @param {Array} packets
 * @return {ArrayBuffer} encoded payload
 * @api private
 */

exports.encodePayloadAsArrayBuffer = function(packets, callback) {
  if (!packets.length) {
    return callback(new ArrayBuffer(0));
  }

  function encodeOne(packet, doneCallback) {
    exports.encodePacket(packet, true, true, function(data) {
      return doneCallback(null, data);
    });
  }

  map(packets, encodeOne, function(err, encodedPackets) {
    var totalLength = encodedPackets.reduce(function(acc, p) {
      var len;
      if (typeof p === 'string'){
        len = p.length;
      } else {
        len = p.byteLength;
      }
      return acc + len.toString().length + len + 2; // string/binary identifier + separator = 2
    }, 0);

    var resultArray = new Uint8Array(totalLength);

    var bufferIndex = 0;
    encodedPackets.forEach(function(p) {
      var isString = typeof p === 'string';
      var ab = p;
      if (isString) {
        var view = new Uint8Array(p.length);
        for (var i = 0; i < p.length; i++) {
          view[i] = p.charCodeAt(i);
        }
        ab = view.buffer;
      }

      if (isString) { // not true binary
        resultArray[bufferIndex++] = 0;
      } else { // true binary
        resultArray[bufferIndex++] = 1;
      }

      var lenStr = ab.byteLength.toString();
      for (var i = 0; i < lenStr.length; i++) {
        resultArray[bufferIndex++] = parseInt(lenStr[i]);
      }
      resultArray[bufferIndex++] = 255;

      var view = new Uint8Array(ab);
      for (var i = 0; i < view.length; i++) {
        resultArray[bufferIndex++] = view[i];
      }
    });

    return callback(resultArray.buffer);
  });
};

/**
 * Encode as Blob
 */

exports.encodePayloadAsBlob = function(packets, callback) {
  function encodeOne(packet, doneCallback) {
    exports.encodePacket(packet, true, true, function(encoded) {
      var binaryIdentifier = new Uint8Array(1);
      binaryIdentifier[0] = 1;
      if (typeof encoded === 'string') {
        var view = new Uint8Array(encoded.length);
        for (var i = 0; i < encoded.length; i++) {
          view[i] = encoded.charCodeAt(i);
        }
        encoded = view.buffer;
        binaryIdentifier[0] = 0;
      }

      var len = (encoded instanceof ArrayBuffer)
        ? encoded.byteLength
        : encoded.size;

      var lenStr = len.toString();
      var lengthAry = new Uint8Array(lenStr.length + 1);
      for (var i = 0; i < lenStr.length; i++) {
        lengthAry[i] = parseInt(lenStr[i]);
      }
      lengthAry[lenStr.length] = 255;

      if (Blob) {
        var blob = new Blob([binaryIdentifier.buffer, lengthAry.buffer, encoded]);
        doneCallback(null, blob);
      }
    });
  }

  map(packets, encodeOne, function(err, results) {
    return callback(new Blob(results));
  });
};

/*
 * Decodes data when a payload is maybe expected. Strings are decoded by
 * interpreting each byte as a key code for entries marked to start with 0. See
 * description of encodePayloadAsBinary
 *
 * @param {ArrayBuffer} data, callback method
 * @api public
 */

exports.decodePayloadAsBinary = function (data, binaryType, callback) {
  if (typeof binaryType === 'function') {
    callback = binaryType;
    binaryType = null;
  }

  var bufferTail = data;
  var buffers = [];

  var numberTooLong = false;
  while (bufferTail.byteLength > 0) {
    var tailArray = new Uint8Array(bufferTail);
    var isString = tailArray[0] === 0;
    var msgLength = '';

    for (var i = 1; ; i++) {
      if (tailArray[i] == 255) break;

      if (msgLength.length > 310) {
        numberTooLong = true;
        break;
      }

      msgLength += tailArray[i];
    }

    if(numberTooLong) return callback(err, 0, 1);

    bufferTail = sliceBuffer(bufferTail, 2 + msgLength.length);
    msgLength = parseInt(msgLength);

    var msg = sliceBuffer(bufferTail, 0, msgLength);
    if (isString) {
      try {
        msg = String.fromCharCode.apply(null, new Uint8Array(msg));
      } catch (e) {
        // iPhone Safari doesn't let you apply to typed arrays
        var typed = new Uint8Array(msg);
        msg = '';
        for (var i = 0; i < typed.length; i++) {
          msg += String.fromCharCode(typed[i]);
        }
      }
    }

    buffers.push(msg);
    bufferTail = sliceBuffer(bufferTail, msgLength);
  }

  var total = buffers.length;
  buffers.forEach(function(buffer, i) {
    callback(exports.decodePacket(buffer, binaryType, true), i, total);
  });
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./keys":34,"after":1,"arraybuffer.slice":2,"base64-arraybuffer":14,"blob":15,"has-binary":39,"utf8":70}],34:[function(require,module,exports){

/**
 * Gets the keys for an object.
 *
 * @return {Array} keys
 * @api private
 */

module.exports = Object.keys || function keys (obj){
  var arr = [];
  var has = Object.prototype.hasOwnProperty;

  for (var i in obj) {
    if (has.call(obj, i)) {
      arr.push(i);
    }
  }
  return arr;
};

},{}],35:[function(require,module,exports){
var WildEmitter = require('wildemitter');
var util = require('util');

function Sender(opts) {
    WildEmitter.call(this);
    var options = opts || {};
    this.config = {
        chunksize: 16384,
        pacing: 0
    };
    // set our config from options
    var item;
    for (item in options) {
        this.config[item] = options[item];
    }

    this.file = null;
    this.channel = null;
}
util.inherits(Sender, WildEmitter);

Sender.prototype.send = function (file, channel) {
    var self = this;
    this.file = file;
    this.channel = channel;
    var usePoll = typeof channel.bufferedAmountLowThreshold !== 'number';
    var offset = 0;
    var sliceFile = function() {
        var reader = new window.FileReader();
        reader.onload = (function() {
            return function(e) {
                self.channel.send(e.target.result);
                self.emit('progress', offset, file.size, e.target.result);

                if (file.size > offset + e.target.result.byteLength) {
                    if (usePoll) {
                        window.setTimeout(sliceFile, self.config.pacing);
                    } else if (channel.bufferedAmount <= channel.bufferedAmountLowThreshold) {
                        window.setTimeout(sliceFile, 0);
                    } else {
                        // wait for bufferedAmountLow to fire
                    }
                } else {
                    self.emit('progress', file.size, file.size, null);
                    self.emit('sentFile');
                }
                offset = offset + self.config.chunksize;
            };
        })(file);
        var slice = file.slice(offset, offset + self.config.chunksize);
        reader.readAsArrayBuffer(slice);
    };
    if (!usePoll) {
        channel.bufferedAmountLowThreshold = 8 * this.config.chunksize;
        channel.addEventListener('bufferedamountlow', sliceFile);
    }
    window.setTimeout(sliceFile, 0);
};

function Receiver() {
    WildEmitter.call(this);

    this.receiveBuffer = [];
    this.received = 0;
    this.metadata = {};
    this.channel = null;
}
util.inherits(Receiver, WildEmitter);

Receiver.prototype.receive = function (metadata, channel) {
    var self = this;

    if (metadata) {
        this.metadata = metadata;
    }
    this.channel = channel;
    // chrome only supports arraybuffers and those make it easier to calc the hash
    channel.binaryType = 'arraybuffer';
    this.channel.onmessage = function (event) {
        var len = event.data.byteLength;
        self.received += len;
        self.receiveBuffer.push(event.data);

        self.emit('progress', self.received, self.metadata.size, event.data);
        if (self.received === self.metadata.size) {
            self.emit('receivedFile', new window.Blob(self.receiveBuffer), self.metadata);
            self.receiveBuffer = []; // discard receivebuffer
        } else if (self.received > self.metadata.size) {
            // FIXME
            console.error('received more than expected, discarding...');
            self.receiveBuffer = []; // just discard...

        }
    };
};

module.exports = {};
module.exports.support = typeof window !== 'undefined' && window && window.File && window.FileReader && window.Blob;
module.exports.Sender = Sender;
module.exports.Receiver = Receiver;

},{"util":73,"wildemitter":75}],36:[function(require,module,exports){
// cache for constraints and callback
var cache = {};

module.exports = function (constraints, cb) {
    var hasConstraints = arguments.length === 2;
    var callback = hasConstraints ? cb : constraints;
    var error;

    if (typeof window === 'undefined' || window.location.protocol === 'http:') {
        error = new Error('NavigatorUserMediaError');
        error.name = 'HTTPS_REQUIRED';
        return callback(error);
    }

    if (window.navigator.userAgent.match('Chrome')) {
        var chromever = parseInt(window.navigator.userAgent.match(/Chrome\/(.*) /)[1], 10);
        var maxver = 33;
        var isCef = !window.chrome.webstore;
        // "known" crash in chrome 34 and 35 on linux
        if (window.navigator.userAgent.match('Linux')) maxver = 35;

        // check that the extension is installed by looking for a
        // sessionStorage variable that contains the extension id
        // this has to be set after installation unless the contest
        // script does that
        if (sessionStorage.getScreenMediaJSExtensionId) {
            chrome.runtime.sendMessage(sessionStorage.getScreenMediaJSExtensionId,
                {type:'getScreen', id: 1}, null,
                function (data) {
                    if (!data || data.sourceId === '') { // user canceled
                        var error = new Error('NavigatorUserMediaError');
                        error.name = 'NotAllowedError';
                        callback(error);
                    } else {
                        constraints = (hasConstraints && constraints) || {audio: false, video: {
                            mandatory: {
                                chromeMediaSource: 'desktop',
                                maxWidth: window.screen.width,
                                maxHeight: window.screen.height,
                                maxFrameRate: 3
                            }
                        }};
                        constraints.video.mandatory.chromeMediaSourceId = data.sourceId;
                        window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                            callback(null, stream);
                        }).catch(function (err) {
                            callback(err);
                        });
                    }
                }
            );
        } else if (window.cefGetScreenMedia) {
            //window.cefGetScreenMedia is experimental - may be removed without notice
            window.cefGetScreenMedia(function(sourceId) {
                if (!sourceId) {
                    var error = new Error('cefGetScreenMediaError');
                    error.name = 'CEF_GETSCREENMEDIA_CANCELED';
                    callback(error);
                } else {
                    constraints = (hasConstraints && constraints) || {audio: false, video: {
                        mandatory: {
                            chromeMediaSource: 'desktop',
                            maxWidth: window.screen.width,
                            maxHeight: window.screen.height,
                            maxFrameRate: 3
                        },
                        optional: [
                            {googLeakyBucket: true},
                            {googTemporalLayeredScreencast: true}
                        ]
                    }};
                    constraints.video.mandatory.chromeMediaSourceId = sourceId;
                    window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                        callback(null, stream);
                    }).catch(function (err) {
                        callback(err);
                    });
                }
            });
        } else if (isCef || (chromever >= 26 && chromever <= maxver)) {
            // chrome 26 - chrome 33 way to do it -- requires bad chrome://flags
            // note: this is basically in maintenance mode and will go away soon
            constraints = (hasConstraints && constraints) || {
                video: {
                    mandatory: {
                        googLeakyBucket: true,
                        maxWidth: window.screen.width,
                        maxHeight: window.screen.height,
                        maxFrameRate: 3,
                        chromeMediaSource: 'screen'
                    }
                }
            };
            window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                callback(null, stream);
            }).catch(function (err) {
                callback(err);
            });
        } else {
            // chrome 34+ way requiring an extension
            var pending = window.setTimeout(function () {
                error = new Error('NavigatorUserMediaError');
                error.name = 'EXTENSION_UNAVAILABLE';
                return callback(error);
            }, 1000);
            cache[pending] = [callback, hasConstraints ? constraints : null];
            window.postMessage({ type: 'getScreen', id: pending }, '*');
        }
    } else if (window.navigator.userAgent.match('Firefox')) {
        var ffver = parseInt(window.navigator.userAgent.match(/Firefox\/(.*)/)[1], 10);
        if (ffver >= 33) {
            constraints = (hasConstraints && constraints) || {
                video: {
                    mozMediaSource: 'window',
                    mediaSource: 'window'
                }
            };
            window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                callback(null, stream);
                var lastTime = stream.currentTime;
                var polly = window.setInterval(function () {
                    if (!stream) window.clearInterval(polly);
                    if (stream.currentTime == lastTime) {
                        window.clearInterval(polly);
                        if (stream.onended) {
                            stream.onended();
                        }
                    }
                    lastTime = stream.currentTime;
                }, 500);
            }).catch(function (err) {
                callback(err);
            });
        } else {
            error = new Error('NavigatorUserMediaError');
            error.name = 'EXTENSION_UNAVAILABLE'; // does not make much sense but...
        }
    }
};

typeof window !== 'undefined' && window.addEventListener('message', function (event) {
    if (event.origin != window.location.origin) {
        return;
    }
    if (event.data.type == 'gotScreen' && cache[event.data.id]) {
        var data = cache[event.data.id];
        var constraints = data[1];
        var callback = data[0];
        delete cache[event.data.id];

        if (event.data.sourceId === '') { // user canceled
            var error = new Error('NavigatorUserMediaError');
            error.name = 'NotAllowedError';
            callback(error);
        } else {
            constraints = constraints || {audio: false, video: {
                mandatory: {
                    chromeMediaSource: 'desktop',
                    maxWidth: window.screen.width,
                    maxHeight: window.screen.height,
                    maxFrameRate: 3
                },
                optional: [
                    {googLeakyBucket: true},
                    {googTemporalLayeredScreencast: true}
                ]
            }};
            constraints.video.mandatory.chromeMediaSourceId = event.data.sourceId;
            window.navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
                callback(null, stream);
            }).catch(function (err) {
                callback(err);
            });
        }
    } else if (event.data.type == 'getScreenPending') {
        window.clearTimeout(event.data.id);
    }
});

},{}],37:[function(require,module,exports){

/**
 * Returns `this`. Execute this without a "context" (i.e. without it being
 * attached to an object of the left-hand side), and `this` points to the
 * "global" scope of the current JS execution.
 */

module.exports = (function () { return this; })();

},{}],38:[function(require,module,exports){
var WildEmitter = require('wildemitter');

function getMaxVolume (analyser, fftBins) {
  var maxVolume = -Infinity;
  analyser.getFloatFrequencyData(fftBins);

  for(var i=4, ii=fftBins.length; i < ii; i++) {
    if (fftBins[i] > maxVolume && fftBins[i] < 0) {
      maxVolume = fftBins[i];
    }
  };

  return maxVolume;
}


var audioContextType;
if (typeof window !== 'undefined') {
  audioContextType = window.AudioContext || window.webkitAudioContext;
}
// use a single audio context due to hardware limits
var audioContext = null;
module.exports = function(stream, options) {
  var harker = new WildEmitter();


  // make it not break in non-supported browsers
  if (!audioContextType) return harker;

  //Config
  var options = options || {},
      smoothing = (options.smoothing || 0.1),
      interval = (options.interval || 50),
      threshold = options.threshold,
      play = options.play,
      history = options.history || 10,
      running = true;

  //Setup Audio Context
  if (!audioContext) {
    audioContext = new audioContextType();
  }
  var sourceNode, fftBins, analyser;

  analyser = audioContext.createAnalyser();
  analyser.fftSize = 512;
  analyser.smoothingTimeConstant = smoothing;
  fftBins = new Float32Array(analyser.frequencyBinCount);

  if (stream.jquery) stream = stream[0];
  if (stream instanceof HTMLAudioElement || stream instanceof HTMLVideoElement) {
    //Audio Tag
    sourceNode = audioContext.createMediaElementSource(stream);
    if (typeof play === 'undefined') play = true;
    threshold = threshold || -50;
  } else {
    //WebRTC Stream
    sourceNode = audioContext.createMediaStreamSource(stream);
    threshold = threshold || -50;
  }

  sourceNode.connect(analyser);
  if (play) analyser.connect(audioContext.destination);

  harker.speaking = false;

  harker.setThreshold = function(t) {
    threshold = t;
  };

  harker.setInterval = function(i) {
    interval = i;
  };

  harker.stop = function() {
    running = false;
    harker.emit('volume_change', -100, threshold);
    if (harker.speaking) {
      harker.speaking = false;
      harker.emit('stopped_speaking');
    }
    analyser.disconnect();
    sourceNode.disconnect();
  };
  harker.speakingHistory = [];
  for (var i = 0; i < history; i++) {
      harker.speakingHistory.push(0);
  }

  // Poll the analyser node to determine if speaking
  // and emit events if changed
  var looper = function() {
    setTimeout(function() {

      //check if stop has been called
      if(!running) {
        return;
      }

      var currentVolume = getMaxVolume(analyser, fftBins);

      harker.emit('volume_change', currentVolume, threshold);

      var history = 0;
      if (currentVolume > threshold && !harker.speaking) {
        // trigger quickly, short history
        for (var i = harker.speakingHistory.length - 3; i < harker.speakingHistory.length; i++) {
          history += harker.speakingHistory[i];
        }
        if (history >= 2) {
          harker.speaking = true;
          harker.emit('speaking');
        }
      } else if (currentVolume < threshold && harker.speaking) {
        for (var i = 0; i < harker.speakingHistory.length; i++) {
          history += harker.speakingHistory[i];
        }
        if (history == 0) {
          harker.speaking = false;
          harker.emit('stopped_speaking');
        }
      }
      harker.speakingHistory.shift();
      harker.speakingHistory.push(0 + (currentVolume > threshold));

      looper();
    }, interval);
  };
  looper();


  return harker;
}

},{"wildemitter":75}],39:[function(require,module,exports){
(function (global){

/*
 * Module requirements.
 */

var isArray = require('isarray');

/**
 * Module exports.
 */

module.exports = hasBinary;

/**
 * Checks for binary data.
 *
 * Right now only Buffer and ArrayBuffer are supported..
 *
 * @param {Object} anything
 * @api public
 */

function hasBinary(data) {

  function _hasBinary(obj) {
    if (!obj) return false;

    if ( (global.Buffer && global.Buffer.isBuffer(obj)) ||
         (global.ArrayBuffer && obj instanceof ArrayBuffer) ||
         (global.Blob && obj instanceof Blob) ||
         (global.File && obj instanceof File)
        ) {
      return true;
    }

    if (isArray(obj)) {
      for (var i = 0; i < obj.length; i++) {
          if (_hasBinary(obj[i])) {
              return true;
          }
      }
    } else if (obj && 'object' == typeof obj) {
      if (obj.toJSON) {
        obj = obj.toJSON();
      }

      for (var key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key) && _hasBinary(obj[key])) {
          return true;
        }
      }
    }

    return false;
  }

  return _hasBinary(data);
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"isarray":42}],40:[function(require,module,exports){

/**
 * Module dependencies.
 */

var global = require('global');

/**
 * Module exports.
 *
 * Logic borrowed from Modernizr:
 *
 *   - https://github.com/Modernizr/Modernizr/blob/master/feature-detects/cors.js
 */

try {
  module.exports = 'XMLHttpRequest' in global &&
    'withCredentials' in new global.XMLHttpRequest();
} catch (err) {
  // if XMLHttp support is disabled in IE then it will throw
  // when trying to create
  module.exports = false;
}

},{"global":37}],41:[function(require,module,exports){

var indexOf = [].indexOf;

module.exports = function(arr, obj){
  if (indexOf) return arr.indexOf(obj);
  for (var i = 0; i < arr.length; ++i) {
    if (arr[i] === obj) return i;
  }
  return -1;
};
},{}],42:[function(require,module,exports){
module.exports = Array.isArray || function (arr) {
  return Object.prototype.toString.call(arr) == '[object Array]';
};

},{}],43:[function(require,module,exports){
/*! JSON v3.2.6 | http://bestiejs.github.io/json3 | Copyright 2012-2013, Kit Cambridge | http://kit.mit-license.org */
;(function (window) {
  // Convenience aliases.
  var getClass = {}.toString, isProperty, forEach, undef;

  // Detect the `define` function exposed by asynchronous module loaders. The
  // strict `define` check is necessary for compatibility with `r.js`.
  var isLoader = typeof define === "function" && define.amd;

  // Detect native implementations.
  var nativeJSON = typeof JSON == "object" && JSON;

  // Set up the JSON 3 namespace, preferring the CommonJS `exports` object if
  // available.
  var JSON3 = typeof exports == "object" && exports && !exports.nodeType && exports;

  if (JSON3 && nativeJSON) {
    // Explicitly delegate to the native `stringify` and `parse`
    // implementations in CommonJS environments.
    JSON3.stringify = nativeJSON.stringify;
    JSON3.parse = nativeJSON.parse;
  } else {
    // Export for web browsers, JavaScript engines, and asynchronous module
    // loaders, using the global `JSON` object if available.
    JSON3 = window.JSON = nativeJSON || {};
  }

  // Test the `Date#getUTC*` methods. Based on work by @Yaffle.
  var isExtended = new Date(-3509827334573292);
  try {
    // The `getUTCFullYear`, `Month`, and `Date` methods return nonsensical
    // results for certain dates in Opera >= 10.53.
    isExtended = isExtended.getUTCFullYear() == -109252 && isExtended.getUTCMonth() === 0 && isExtended.getUTCDate() === 1 &&
      // Safari < 2.0.2 stores the internal millisecond time value correctly,
      // but clips the values returned by the date methods to the range of
      // signed 32-bit integers ([-2 ** 31, 2 ** 31 - 1]).
      isExtended.getUTCHours() == 10 && isExtended.getUTCMinutes() == 37 && isExtended.getUTCSeconds() == 6 && isExtended.getUTCMilliseconds() == 708;
  } catch (exception) {}

  // Internal: Determines whether the native `JSON.stringify` and `parse`
  // implementations are spec-compliant. Based on work by Ken Snyder.
  function has(name) {
    if (has[name] !== undef) {
      // Return cached feature test result.
      return has[name];
    }

    var isSupported;
    if (name == "bug-string-char-index") {
      // IE <= 7 doesn't support accessing string characters using square
      // bracket notation. IE 8 only supports this for primitives.
      isSupported = "a"[0] != "a";
    } else if (name == "json") {
      // Indicates whether both `JSON.stringify` and `JSON.parse` are
      // supported.
      isSupported = has("json-stringify") && has("json-parse");
    } else {
      var value, serialized = '{"a":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}';
      // Test `JSON.stringify`.
      if (name == "json-stringify") {
        var stringify = JSON3.stringify, stringifySupported = typeof stringify == "function" && isExtended;
        if (stringifySupported) {
          // A test function object with a custom `toJSON` method.
          (value = function () {
            return 1;
          }).toJSON = value;
          try {
            stringifySupported =
              // Firefox 3.1b1 and b2 serialize string, number, and boolean
              // primitives as object literals.
              stringify(0) === "0" &&
              // FF 3.1b1, b2, and JSON 2 serialize wrapped primitives as object
              // literals.
              stringify(new Number()) === "0" &&
              stringify(new String()) == '""' &&
              // FF 3.1b1, 2 throw an error if the value is `null`, `undefined`, or
              // does not define a canonical JSON representation (this applies to
              // objects with `toJSON` properties as well, *unless* they are nested
              // within an object or array).
              stringify(getClass) === undef &&
              // IE 8 serializes `undefined` as `"undefined"`. Safari <= 5.1.7 and
              // FF 3.1b3 pass this test.
              stringify(undef) === undef &&
              // Safari <= 5.1.7 and FF 3.1b3 throw `Error`s and `TypeError`s,
              // respectively, if the value is omitted entirely.
              stringify() === undef &&
              // FF 3.1b1, 2 throw an error if the given value is not a number,
              // string, array, object, Boolean, or `null` literal. This applies to
              // objects with custom `toJSON` methods as well, unless they are nested
              // inside object or array literals. YUI 3.0.0b1 ignores custom `toJSON`
              // methods entirely.
              stringify(value) === "1" &&
              stringify([value]) == "[1]" &&
              // Prototype <= 1.6.1 serializes `[undefined]` as `"[]"` instead of
              // `"[null]"`.
              stringify([undef]) == "[null]" &&
              // YUI 3.0.0b1 fails to serialize `null` literals.
              stringify(null) == "null" &&
              // FF 3.1b1, 2 halts serialization if an array contains a function:
              // `[1, true, getClass, 1]` serializes as "[1,true,],". FF 3.1b3
              // elides non-JSON values from objects and arrays, unless they
              // define custom `toJSON` methods.
              stringify([undef, getClass, null]) == "[null,null,null]" &&
              // Simple serialization test. FF 3.1b1 uses Unicode escape sequences
              // where character escape codes are expected (e.g., `\b` => `\u0008`).
              stringify({ "a": [value, true, false, null, "\x00\b\n\f\r\t"] }) == serialized &&
              // FF 3.1b1 and b2 ignore the `filter` and `width` arguments.
              stringify(null, value) === "1" &&
              stringify([1, 2], null, 1) == "[\n 1,\n 2\n]" &&
              // JSON 2, Prototype <= 1.7, and older WebKit builds incorrectly
              // serialize extended years.
              stringify(new Date(-8.64e15)) == '"-271821-04-20T00:00:00.000Z"' &&
              // The milliseconds are optional in ES 5, but required in 5.1.
              stringify(new Date(8.64e15)) == '"+275760-09-13T00:00:00.000Z"' &&
              // Firefox <= 11.0 incorrectly serializes years prior to 0 as negative
              // four-digit years instead of six-digit years. Credits: @Yaffle.
              stringify(new Date(-621987552e5)) == '"-000001-01-01T00:00:00.000Z"' &&
              // Safari <= 5.1.5 and Opera >= 10.53 incorrectly serialize millisecond
              // values less than 1000. Credits: @Yaffle.
              stringify(new Date(-1)) == '"1969-12-31T23:59:59.999Z"';
          } catch (exception) {
            stringifySupported = false;
          }
        }
        isSupported = stringifySupported;
      }
      // Test `JSON.parse`.
      if (name == "json-parse") {
        var parse = JSON3.parse;
        if (typeof parse == "function") {
          try {
            // FF 3.1b1, b2 will throw an exception if a bare literal is provided.
            // Conforming implementations should also coerce the initial argument to
            // a string prior to parsing.
            if (parse("0") === 0 && !parse(false)) {
              // Simple parsing test.
              value = parse(serialized);
              var parseSupported = value["a"].length == 5 && value["a"][0] === 1;
              if (parseSupported) {
                try {
                  // Safari <= 5.1.2 and FF 3.1b1 allow unescaped tabs in strings.
                  parseSupported = !parse('"\t"');
                } catch (exception) {}
                if (parseSupported) {
                  try {
                    // FF 4.0 and 4.0.1 allow leading `+` signs and leading
                    // decimal points. FF 4.0, 4.0.1, and IE 9-10 also allow
                    // certain octal literals.
                    parseSupported = parse("01") !== 1;
                  } catch (exception) {}
                }
                if (parseSupported) {
                  try {
                    // FF 4.0, 4.0.1, and Rhino 1.7R3-R4 allow trailing decimal
                    // points. These environments, along with FF 3.1b1 and 2,
                    // also allow trailing commas in JSON objects and arrays.
                    parseSupported = parse("1.") !== 1;
                  } catch (exception) {}
                }
              }
            }
          } catch (exception) {
            parseSupported = false;
          }
        }
        isSupported = parseSupported;
      }
    }
    return has[name] = !!isSupported;
  }

  if (!has("json")) {
    // Common `[[Class]]` name aliases.
    var functionClass = "[object Function]";
    var dateClass = "[object Date]";
    var numberClass = "[object Number]";
    var stringClass = "[object String]";
    var arrayClass = "[object Array]";
    var booleanClass = "[object Boolean]";

    // Detect incomplete support for accessing string characters by index.
    var charIndexBuggy = has("bug-string-char-index");

    // Define additional utility methods if the `Date` methods are buggy.
    if (!isExtended) {
      var floor = Math.floor;
      // A mapping between the months of the year and the number of days between
      // January 1st and the first of the respective month.
      var Months = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
      // Internal: Calculates the number of days between the Unix epoch and the
      // first day of the given month.
      var getDay = function (year, month) {
        return Months[month] + 365 * (year - 1970) + floor((year - 1969 + (month = +(month > 1))) / 4) - floor((year - 1901 + month) / 100) + floor((year - 1601 + month) / 400);
      };
    }

    // Internal: Determines if a property is a direct property of the given
    // object. Delegates to the native `Object#hasOwnProperty` method.
    if (!(isProperty = {}.hasOwnProperty)) {
      isProperty = function (property) {
        var members = {}, constructor;
        if ((members.__proto__ = null, members.__proto__ = {
          // The *proto* property cannot be set multiple times in recent
          // versions of Firefox and SeaMonkey.
          "toString": 1
        }, members).toString != getClass) {
          // Safari <= 2.0.3 doesn't implement `Object#hasOwnProperty`, but
          // supports the mutable *proto* property.
          isProperty = function (property) {
            // Capture and break the object's prototype chain (see section 8.6.2
            // of the ES 5.1 spec). The parenthesized expression prevents an
            // unsafe transformation by the Closure Compiler.
            var original = this.__proto__, result = property in (this.__proto__ = null, this);
            // Restore the original prototype chain.
            this.__proto__ = original;
            return result;
          };
        } else {
          // Capture a reference to the top-level `Object` constructor.
          constructor = members.constructor;
          // Use the `constructor` property to simulate `Object#hasOwnProperty` in
          // other environments.
          isProperty = function (property) {
            var parent = (this.constructor || constructor).prototype;
            return property in this && !(property in parent && this[property] === parent[property]);
          };
        }
        members = null;
        return isProperty.call(this, property);
      };
    }

    // Internal: A set of primitive types used by `isHostType`.
    var PrimitiveTypes = {
      'boolean': 1,
      'number': 1,
      'string': 1,
      'undefined': 1
    };

    // Internal: Determines if the given object `property` value is a
    // non-primitive.
    var isHostType = function (object, property) {
      var type = typeof object[property];
      return type == 'object' ? !!object[property] : !PrimitiveTypes[type];
    };

    // Internal: Normalizes the `for...in` iteration algorithm across
    // environments. Each enumerated key is yielded to a `callback` function.
    forEach = function (object, callback) {
      var size = 0, Properties, members, property;

      // Tests for bugs in the current environment's `for...in` algorithm. The
      // `valueOf` property inherits the non-enumerable flag from
      // `Object.prototype` in older versions of IE, Netscape, and Mozilla.
      (Properties = function () {
        this.valueOf = 0;
      }).prototype.valueOf = 0;

      // Iterate over a new instance of the `Properties` class.
      members = new Properties();
      for (property in members) {
        // Ignore all properties inherited from `Object.prototype`.
        if (isProperty.call(members, property)) {
          size++;
        }
      }
      Properties = members = null;

      // Normalize the iteration algorithm.
      if (!size) {
        // A list of non-enumerable properties inherited from `Object.prototype`.
        members = ["valueOf", "toString", "toLocaleString", "propertyIsEnumerable", "isPrototypeOf", "hasOwnProperty", "constructor"];
        // IE <= 8, Mozilla 1.0, and Netscape 6.2 ignore shadowed non-enumerable
        // properties.
        forEach = function (object, callback) {
          var isFunction = getClass.call(object) == functionClass, property, length;
          var hasProperty = !isFunction && typeof object.constructor != 'function' && isHostType(object, 'hasOwnProperty') ? object.hasOwnProperty : isProperty;
          for (property in object) {
            // Gecko <= 1.0 enumerates the `prototype` property of functions under
            // certain conditions; IE does not.
            if (!(isFunction && property == "prototype") && hasProperty.call(object, property)) {
              callback(property);
            }
          }
          // Manually invoke the callback for each non-enumerable property.
          for (length = members.length; property = members[--length]; hasProperty.call(object, property) && callback(property));
        };
      } else if (size == 2) {
        // Safari <= 2.0.4 enumerates shadowed properties twice.
        forEach = function (object, callback) {
          // Create a set of iterated properties.
          var members = {}, isFunction = getClass.call(object) == functionClass, property;
          for (property in object) {
            // Store each property name to prevent double enumeration. The
            // `prototype` property of functions is not enumerated due to cross-
            // environment inconsistencies.
            if (!(isFunction && property == "prototype") && !isProperty.call(members, property) && (members[property] = 1) && isProperty.call(object, property)) {
              callback(property);
            }
          }
        };
      } else {
        // No bugs detected; use the standard `for...in` algorithm.
        forEach = function (object, callback) {
          var isFunction = getClass.call(object) == functionClass, property, isConstructor;
          for (property in object) {
            if (!(isFunction && property == "prototype") && isProperty.call(object, property) && !(isConstructor = property === "constructor")) {
              callback(property);
            }
          }
          // Manually invoke the callback for the `constructor` property due to
          // cross-environment inconsistencies.
          if (isConstructor || isProperty.call(object, (property = "constructor"))) {
            callback(property);
          }
        };
      }
      return forEach(object, callback);
    };

    // Public: Serializes a JavaScript `value` as a JSON string. The optional
    // `filter` argument may specify either a function that alters how object and
    // array members are serialized, or an array of strings and numbers that
    // indicates which properties should be serialized. The optional `width`
    // argument may be either a string or number that specifies the indentation
    // level of the output.
    if (!has("json-stringify")) {
      // Internal: A map of control characters and their escaped equivalents.
      var Escapes = {
        92: "\\\\",
        34: '\\"',
        8: "\\b",
        12: "\\f",
        10: "\\n",
        13: "\\r",
        9: "\\t"
      };

      // Internal: Converts `value` into a zero-padded string such that its
      // length is at least equal to `width`. The `width` must be <= 6.
      var leadingZeroes = "000000";
      var toPaddedString = function (width, value) {
        // The `|| 0` expression is necessary to work around a bug in
        // Opera <= 7.54u2 where `0 == -0`, but `String(-0) !== "0"`.
        return (leadingZeroes + (value || 0)).slice(-width);
      };

      // Internal: Double-quotes a string `value`, replacing all ASCII control
      // characters (characters with code unit values between 0 and 31) with
      // their escaped equivalents. This is an implementation of the
      // `Quote(value)` operation defined in ES 5.1 section 15.12.3.
      var unicodePrefix = "\\u00";
      var quote = function (value) {
        var result = '"', index = 0, length = value.length, isLarge = length > 10 && charIndexBuggy, symbols;
        if (isLarge) {
          symbols = value.split("");
        }
        for (; index < length; index++) {
          var charCode = value.charCodeAt(index);
          // If the character is a control character, append its Unicode or
          // shorthand escape sequence; otherwise, append the character as-is.
          switch (charCode) {
            case 8: case 9: case 10: case 12: case 13: case 34: case 92:
              result += Escapes[charCode];
              break;
            default:
              if (charCode < 32) {
                result += unicodePrefix + toPaddedString(2, charCode.toString(16));
                break;
              }
              result += isLarge ? symbols[index] : charIndexBuggy ? value.charAt(index) : value[index];
          }
        }
        return result + '"';
      };

      // Internal: Recursively serializes an object. Implements the
      // `Str(key, holder)`, `JO(value)`, and `JA(value)` operations.
      var serialize = function (property, object, callback, properties, whitespace, indentation, stack) {
        var value, className, year, month, date, time, hours, minutes, seconds, milliseconds, results, element, index, length, prefix, result;
        try {
          // Necessary for host object support.
          value = object[property];
        } catch (exception) {}
        if (typeof value == "object" && value) {
          className = getClass.call(value);
          if (className == dateClass && !isProperty.call(value, "toJSON")) {
            if (value > -1 / 0 && value < 1 / 0) {
              // Dates are serialized according to the `Date#toJSON` method
              // specified in ES 5.1 section 15.9.5.44. See section 15.9.1.15
              // for the ISO 8601 date time string format.
              if (getDay) {
                // Manually compute the year, month, date, hours, minutes,
                // seconds, and milliseconds if the `getUTC*` methods are
                // buggy. Adapted from @Yaffle's `date-shim` project.
                date = floor(value / 864e5);
                for (year = floor(date / 365.2425) + 1970 - 1; getDay(year + 1, 0) <= date; year++);
                for (month = floor((date - getDay(year, 0)) / 30.42); getDay(year, month + 1) <= date; month++);
                date = 1 + date - getDay(year, month);
                // The `time` value specifies the time within the day (see ES
                // 5.1 section 15.9.1.2). The formula `(A % B + B) % B` is used
                // to compute `A modulo B`, as the `%` operator does not
                // correspond to the `modulo` operation for negative numbers.
                time = (value % 864e5 + 864e5) % 864e5;
                // The hours, minutes, seconds, and milliseconds are obtained by
                // decomposing the time within the day. See section 15.9.1.10.
                hours = floor(time / 36e5) % 24;
                minutes = floor(time / 6e4) % 60;
                seconds = floor(time / 1e3) % 60;
                milliseconds = time % 1e3;
              } else {
                year = value.getUTCFullYear();
                month = value.getUTCMonth();
                date = value.getUTCDate();
                hours = value.getUTCHours();
                minutes = value.getUTCMinutes();
                seconds = value.getUTCSeconds();
                milliseconds = value.getUTCMilliseconds();
              }
              // Serialize extended years correctly.
              value = (year <= 0 || year >= 1e4 ? (year < 0 ? "-" : "+") + toPaddedString(6, year < 0 ? -year : year) : toPaddedString(4, year)) +
                "-" + toPaddedString(2, month + 1) + "-" + toPaddedString(2, date) +
                // Months, dates, hours, minutes, and seconds should have two
                // digits; milliseconds should have three.
                "T" + toPaddedString(2, hours) + ":" + toPaddedString(2, minutes) + ":" + toPaddedString(2, seconds) +
                // Milliseconds are optional in ES 5.0, but required in 5.1.
                "." + toPaddedString(3, milliseconds) + "Z";
            } else {
              value = null;
            }
          } else if (typeof value.toJSON == "function" && ((className != numberClass && className != stringClass && className != arrayClass) || isProperty.call(value, "toJSON"))) {
            // Prototype <= 1.6.1 adds non-standard `toJSON` methods to the
            // `Number`, `String`, `Date`, and `Array` prototypes. JSON 3
            // ignores all `toJSON` methods on these objects unless they are
            // defined directly on an instance.
            value = value.toJSON(property);
          }
        }
        if (callback) {
          // If a replacement function was provided, call it to obtain the value
          // for serialization.
          value = callback.call(object, property, value);
        }
        if (value === null) {
          return "null";
        }
        className = getClass.call(value);
        if (className == booleanClass) {
          // Booleans are represented literally.
          return "" + value;
        } else if (className == numberClass) {
          // JSON numbers must be finite. `Infinity` and `NaN` are serialized as
          // `"null"`.
          return value > -1 / 0 && value < 1 / 0 ? "" + value : "null";
        } else if (className == stringClass) {
          // Strings are double-quoted and escaped.
          return quote("" + value);
        }
        // Recursively serialize objects and arrays.
        if (typeof value == "object") {
          // Check for cyclic structures. This is a linear search; performance
          // is inversely proportional to the number of unique nested objects.
          for (length = stack.length; length--;) {
            if (stack[length] === value) {
              // Cyclic structures cannot be serialized by `JSON.stringify`.
              throw TypeError();
            }
          }
          // Add the object to the stack of traversed objects.
          stack.push(value);
          results = [];
          // Save the current indentation level and indent one additional level.
          prefix = indentation;
          indentation += whitespace;
          if (className == arrayClass) {
            // Recursively serialize array elements.
            for (index = 0, length = value.length; index < length; index++) {
              element = serialize(index, value, callback, properties, whitespace, indentation, stack);
              results.push(element === undef ? "null" : element);
            }
            result = results.length ? (whitespace ? "[\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "]" : ("[" + results.join(",") + "]")) : "[]";
          } else {
            // Recursively serialize object members. Members are selected from
            // either a user-specified list of property names, or the object
            // itself.
            forEach(properties || value, function (property) {
              var element = serialize(property, value, callback, properties, whitespace, indentation, stack);
              if (element !== undef) {
                // According to ES 5.1 section 15.12.3: "If `gap` {whitespace}
                // is not the empty string, let `member` {quote(property) + ":"}
                // be the concatenation of `member` and the `space` character."
                // The "`space` character" refers to the literal space
                // character, not the `space` {width} argument provided to
                // `JSON.stringify`.
                results.push(quote(property) + ":" + (whitespace ? " " : "") + element);
              }
            });
            result = results.length ? (whitespace ? "{\n" + indentation + results.join(",\n" + indentation) + "\n" + prefix + "}" : ("{" + results.join(",") + "}")) : "{}";
          }
          // Remove the object from the traversed object stack.
          stack.pop();
          return result;
        }
      };

      // Public: `JSON.stringify`. See ES 5.1 section 15.12.3.
      JSON3.stringify = function (source, filter, width) {
        var whitespace, callback, properties, className;
        if (typeof filter == "function" || typeof filter == "object" && filter) {
          if ((className = getClass.call(filter)) == functionClass) {
            callback = filter;
          } else if (className == arrayClass) {
            // Convert the property names array into a makeshift set.
            properties = {};
            for (var index = 0, length = filter.length, value; index < length; value = filter[index++], ((className = getClass.call(value)), className == stringClass || className == numberClass) && (properties[value] = 1));
          }
        }
        if (width) {
          if ((className = getClass.call(width)) == numberClass) {
            // Convert the `width` to an integer and create a string containing
            // `width` number of space characters.
            if ((width -= width % 1) > 0) {
              for (whitespace = "", width > 10 && (width = 10); whitespace.length < width; whitespace += " ");
            }
          } else if (className == stringClass) {
            whitespace = width.length <= 10 ? width : width.slice(0, 10);
          }
        }
        // Opera <= 7.54u2 discards the values associated with empty string keys
        // (`""`) only if they are used directly within an object member list
        // (e.g., `!("" in { "": 1})`).
        return serialize("", (value = {}, value[""] = source, value), callback, properties, whitespace, "", []);
      };
    }

    // Public: Parses a JSON source string.
    if (!has("json-parse")) {
      var fromCharCode = String.fromCharCode;

      // Internal: A map of escaped control characters and their unescaped
      // equivalents.
      var Unescapes = {
        92: "\\",
        34: '"',
        47: "/",
        98: "\b",
        116: "\t",
        110: "\n",
        102: "\f",
        114: "\r"
      };

      // Internal: Stores the parser state.
      var Index, Source;

      // Internal: Resets the parser state and throws a `SyntaxError`.
      var abort = function() {
        Index = Source = null;
        throw SyntaxError();
      };

      // Internal: Returns the next token, or `"$"` if the parser has reached
      // the end of the source string. A token may be a string, number, `null`
      // literal, or Boolean literal.
      var lex = function () {
        var source = Source, length = source.length, value, begin, position, isSigned, charCode;
        while (Index < length) {
          charCode = source.charCodeAt(Index);
          switch (charCode) {
            case 9: case 10: case 13: case 32:
              // Skip whitespace tokens, including tabs, carriage returns, line
              // feeds, and space characters.
              Index++;
              break;
            case 123: case 125: case 91: case 93: case 58: case 44:
              // Parse a punctuator token (`{`, `}`, `[`, `]`, `:`, or `,`) at
              // the current position.
              value = charIndexBuggy ? source.charAt(Index) : source[Index];
              Index++;
              return value;
            case 34:
              // `"` delimits a JSON string; advance to the next character and
              // begin parsing the string. String tokens are prefixed with the
              // sentinel `@` character to distinguish them from punctuators and
              // end-of-string tokens.
              for (value = "@", Index++; Index < length;) {
                charCode = source.charCodeAt(Index);
                if (charCode < 32) {
                  // Unescaped ASCII control characters (those with a code unit
                  // less than the space character) are not permitted.
                  abort();
                } else if (charCode == 92) {
                  // A reverse solidus (`\`) marks the beginning of an escaped
                  // control character (including `"`, `\`, and `/`) or Unicode
                  // escape sequence.
                  charCode = source.charCodeAt(++Index);
                  switch (charCode) {
                    case 92: case 34: case 47: case 98: case 116: case 110: case 102: case 114:
                      // Revive escaped control characters.
                      value += Unescapes[charCode];
                      Index++;
                      break;
                    case 117:
                      // `\u` marks the beginning of a Unicode escape sequence.
                      // Advance to the first character and validate the
                      // four-digit code point.
                      begin = ++Index;
                      for (position = Index + 4; Index < position; Index++) {
                        charCode = source.charCodeAt(Index);
                        // A valid sequence comprises four hexdigits (case-
                        // insensitive) that form a single hexadecimal value.
                        if (!(charCode >= 48 && charCode <= 57 || charCode >= 97 && charCode <= 102 || charCode >= 65 && charCode <= 70)) {
                          // Invalid Unicode escape sequence.
                          abort();
                        }
                      }
                      // Revive the escaped character.
                      value += fromCharCode("0x" + source.slice(begin, Index));
                      break;
                    default:
                      // Invalid escape sequence.
                      abort();
                  }
                } else {
                  if (charCode == 34) {
                    // An unescaped double-quote character marks the end of the
                    // string.
                    break;
                  }
                  charCode = source.charCodeAt(Index);
                  begin = Index;
                  // Optimize for the common case where a string is valid.
                  while (charCode >= 32 && charCode != 92 && charCode != 34) {
                    charCode = source.charCodeAt(++Index);
                  }
                  // Append the string as-is.
                  value += source.slice(begin, Index);
                }
              }
              if (source.charCodeAt(Index) == 34) {
                // Advance to the next character and return the revived string.
                Index++;
                return value;
              }
              // Unterminated string.
              abort();
            default:
              // Parse numbers and literals.
              begin = Index;
              // Advance past the negative sign, if one is specified.
              if (charCode == 45) {
                isSigned = true;
                charCode = source.charCodeAt(++Index);
              }
              // Parse an integer or floating-point value.
              if (charCode >= 48 && charCode <= 57) {
                // Leading zeroes are interpreted as octal literals.
                if (charCode == 48 && ((charCode = source.charCodeAt(Index + 1)), charCode >= 48 && charCode <= 57)) {
                  // Illegal octal literal.
                  abort();
                }
                isSigned = false;
                // Parse the integer component.
                for (; Index < length && ((charCode = source.charCodeAt(Index)), charCode >= 48 && charCode <= 57); Index++);
                // Floats cannot contain a leading decimal point; however, this
                // case is already accounted for by the parser.
                if (source.charCodeAt(Index) == 46) {
                  position = ++Index;
                  // Parse the decimal component.
                  for (; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                  if (position == Index) {
                    // Illegal trailing decimal.
                    abort();
                  }
                  Index = position;
                }
                // Parse exponents. The `e` denoting the exponent is
                // case-insensitive.
                charCode = source.charCodeAt(Index);
                if (charCode == 101 || charCode == 69) {
                  charCode = source.charCodeAt(++Index);
                  // Skip past the sign following the exponent, if one is
                  // specified.
                  if (charCode == 43 || charCode == 45) {
                    Index++;
                  }
                  // Parse the exponential component.
                  for (position = Index; position < length && ((charCode = source.charCodeAt(position)), charCode >= 48 && charCode <= 57); position++);
                  if (position == Index) {
                    // Illegal empty exponent.
                    abort();
                  }
                  Index = position;
                }
                // Coerce the parsed value to a JavaScript number.
                return +source.slice(begin, Index);
              }
              // A negative sign may only precede numbers.
              if (isSigned) {
                abort();
              }
              // `true`, `false`, and `null` literals.
              if (source.slice(Index, Index + 4) == "true") {
                Index += 4;
                return true;
              } else if (source.slice(Index, Index + 5) == "false") {
                Index += 5;
                return false;
              } else if (source.slice(Index, Index + 4) == "null") {
                Index += 4;
                return null;
              }
              // Unrecognized token.
              abort();
          }
        }
        // Return the sentinel `$` character if the parser has reached the end
        // of the source string.
        return "$";
      };

      // Internal: Parses a JSON `value` token.
      var get = function (value) {
        var results, hasMembers;
        if (value == "$") {
          // Unexpected end of input.
          abort();
        }
        if (typeof value == "string") {
          if ((charIndexBuggy ? value.charAt(0) : value[0]) == "@") {
            // Remove the sentinel `@` character.
            return value.slice(1);
          }
          // Parse object and array literals.
          if (value == "[") {
            // Parses a JSON array, returning a new JavaScript array.
            results = [];
            for (;; hasMembers || (hasMembers = true)) {
              value = lex();
              // A closing square bracket marks the end of the array literal.
              if (value == "]") {
                break;
              }
              // If the array literal contains elements, the current token
              // should be a comma separating the previous element from the
              // next.
              if (hasMembers) {
                if (value == ",") {
                  value = lex();
                  if (value == "]") {
                    // Unexpected trailing `,` in array literal.
                    abort();
                  }
                } else {
                  // A `,` must separate each array element.
                  abort();
                }
              }
              // Elisions and leading commas are not permitted.
              if (value == ",") {
                abort();
              }
              results.push(get(value));
            }
            return results;
          } else if (value == "{") {
            // Parses a JSON object, returning a new JavaScript object.
            results = {};
            for (;; hasMembers || (hasMembers = true)) {
              value = lex();
              // A closing curly brace marks the end of the object literal.
              if (value == "}") {
                break;
              }
              // If the object literal contains members, the current token
              // should be a comma separator.
              if (hasMembers) {
                if (value == ",") {
                  value = lex();
                  if (value == "}") {
                    // Unexpected trailing `,` in object literal.
                    abort();
                  }
                } else {
                  // A `,` must separate each object member.
                  abort();
                }
              }
              // Leading commas are not permitted, object property names must be
              // double-quoted strings, and a `:` must separate each property
              // name and value.
              if (value == "," || typeof value != "string" || (charIndexBuggy ? value.charAt(0) : value[0]) != "@" || lex() != ":") {
                abort();
              }
              results[value.slice(1)] = get(lex());
            }
            return results;
          }
          // Unexpected token encountered.
          abort();
        }
        return value;
      };

      // Internal: Updates a traversed object member.
      var update = function(source, property, callback) {
        var element = walk(source, property, callback);
        if (element === undef) {
          delete source[property];
        } else {
          source[property] = element;
        }
      };

      // Internal: Recursively traverses a parsed JSON object, invoking the
      // `callback` function for each value. This is an implementation of the
      // `Walk(holder, name)` operation defined in ES 5.1 section 15.12.2.
      var walk = function (source, property, callback) {
        var value = source[property], length;
        if (typeof value == "object" && value) {
          // `forEach` can't be used to traverse an array in Opera <= 8.54
          // because its `Object#hasOwnProperty` implementation returns `false`
          // for array indices (e.g., `![1, 2, 3].hasOwnProperty("0")`).
          if (getClass.call(value) == arrayClass) {
            for (length = value.length; length--;) {
              update(value, length, callback);
            }
          } else {
            forEach(value, function (property) {
              update(value, property, callback);
            });
          }
        }
        return callback.call(source, property, value);
      };

      // Public: `JSON.parse`. See ES 5.1 section 15.12.2.
      JSON3.parse = function (source, callback) {
        var result, value;
        Index = 0;
        Source = "" + source;
        result = get(lex());
        // If a JSON string contains multiple tokens, it is invalid.
        if (lex() != "$") {
          abort();
        }
        // Reset the parser state.
        Index = Source = null;
        return callback && getClass.call(callback) == functionClass ? walk((value = {}, value[""] = result, value), "", callback) : result;
      };
    }
  }

  // Export for asynchronous module loaders.
  if (isLoader) {
    define(function () {
      return JSON3;
    });
  }
}(this));

},{}],44:[function(require,module,exports){
var util = require('util');
var hark = require('hark');
var getScreenMedia = require('getscreenmedia');
var WildEmitter = require('wildemitter');
var mockconsole = require('mockconsole');

function isAllTracksEnded(stream) {
    var isAllTracksEnded = true;
    stream.getTracks().forEach(function (t) {
        isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
    });
    return isAllTracksEnded;
}

function shouldWorkAroundFirefoxStopStream() {
  if (typeof window === 'undefined') {
    return false;
  }
  if (!window.navigator.mozGetUserMedia) {
    return false;
  }
  var match = window.navigator.userAgent.match(/Firefox\/(\d+)\./);
  var version = match && match.length >= 1 && parseInt(match[1], 10);
  return version < 50;
}

function LocalMedia(opts) {
    WildEmitter.call(this);

    var config = this.config = {
        detectSpeakingEvents: false,
        audioFallback: false,
        media: {
            audio: true,
            video: true
        },
        harkOptions: null,
        logger: mockconsole
    };

    var item;
    for (item in opts) {
        if (opts.hasOwnProperty(item)) {
            this.config[item] = opts[item];
        }
    }

    this.logger = config.logger;
    this._log = this.logger.log.bind(this.logger, 'LocalMedia:');
    this._logerror = this.logger.error.bind(this.logger, 'LocalMedia:');

    this.localStreams = [];
    this.localScreens = [];

    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
        this._logerror('Your browser does not support local media capture.');
    }

    this._audioMonitors = [];
    this.on('localStreamStopped', this._stopAudioMonitor.bind(this));
    this.on('localScreenStopped', this._stopAudioMonitor.bind(this));
}

util.inherits(LocalMedia, WildEmitter);


LocalMedia.prototype.start = function (mediaConstraints, cb) {
    var self = this;
    var constraints = mediaConstraints || this.config.media;

    this.emit('localStreamRequested', constraints);

    navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
        if (constraints.audio && self.config.detectSpeakingEvents) {
            self._setupAudioMonitor(stream, self.config.harkOptions);
        }
        self.localStreams.push(stream);

        stream.getTracks().forEach(function (track) {
            track.addEventListener('ended', function () {
                if (isAllTracksEnded(stream)) {
                    self._removeStream(stream);
                }
            });
        });

        self.emit('localStream', stream);

        if (cb) {
            return cb(null, stream);
        }
    }).catch(function (err) {
            // Fallback for users without a camera
            if (self.config.audioFallback && err.name === 'DevicesNotFoundError' && constraints.video !== false) {
                constraints.video = false;
                self.start(constraints, cb);
                return;
            }

        self.emit('localStreamRequestFailed', constraints);

        if (cb) {
            return cb(err, null);
        }
    });
};

LocalMedia.prototype.stop = function (stream) {
    this.stopStream(stream);
    this.stopScreenShare(stream);
};

LocalMedia.prototype.stopStream = function (stream) {
    var self = this;

    if (stream) {
        var idx = this.localStreams.indexOf(stream);
        if (idx > -1) {
            stream.getTracks().forEach(function (track) { track.stop(); });

            //Half-working fix for Firefox, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1208373
            if (shouldWorkAroundFirefoxStopStream()) {
                this._removeStream(stream);
            }
        }
    } else {
        this.localStreams.forEach(function (stream) {
            stream.getTracks().forEach(function (track) { track.stop(); });

            //Half-working fix for Firefox, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1208373
            if (shouldWorkAroundFirefoxStopStream()) {
                self._removeStream(stream);
            }
        });
    }
};

LocalMedia.prototype.startScreenShare = function (constraints, cb) {
    var self = this;

    this.emit('localScreenRequested');

    if (typeof constraints === 'function' && !cb) {
        cb = constraints;
        constraints = null;
    }

    getScreenMedia(constraints, function (err, stream) {
        if (!err) {
            self.localScreens.push(stream);

            stream.getTracks().forEach(function (track) {
                track.addEventListener('ended', function () {
                    var isAllTracksEnded = true;
                    stream.getTracks().forEach(function (t) {
                        isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
                    });

                    if (isAllTracksEnded) {
                        self._removeStream(stream);
                    }
                });
            });

            self.emit('localScreen', stream);
        } else {
            self.emit('localScreenRequestFailed');
        }

        // enable the callback
        if (cb) {
            return cb(err, stream);
        }
    });
};

LocalMedia.prototype.stopScreenShare = function (stream) {
    var self = this;

    if (stream) {
        var idx = this.localScreens.indexOf(stream);
        if (idx > -1) {
            stream.getTracks().forEach(function (track) { track.stop(); });

            //Half-working fix for Firefox, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1208373
            if (shouldWorkAroundFirefoxStopStream()) {
                this._removeStream(stream);
            }
        }
    } else {
        this.localScreens.forEach(function (stream) {
            stream.getTracks().forEach(function (track) { track.stop(); });

            //Half-working fix for Firefox, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1208373
            if (shouldWorkAroundFirefoxStopStream()) {
                self._removeStream(stream);
            }
        });
    }
};

// Audio controls
LocalMedia.prototype.mute = function () {
    this._audioEnabled(false);
    this.emit('audioOff');
};

LocalMedia.prototype.unmute = function () {
    this._audioEnabled(true);
    this.emit('audioOn');
};

// Video controls
LocalMedia.prototype.pauseVideo = function () {
    this._videoEnabled(false);
    this.emit('videoOff');
};
LocalMedia.prototype.resumeVideo = function () {
    this._videoEnabled(true);
    this.emit('videoOn');
};

// Combined controls
LocalMedia.prototype.pause = function () {
    this.mute();
    this.pauseVideo();
};
LocalMedia.prototype.resume = function () {
    this.unmute();
    this.resumeVideo();
};

// Internal methods for enabling/disabling audio/video
LocalMedia.prototype._audioEnabled = function (bool) {
    this.localStreams.forEach(function (stream) {
        stream.getAudioTracks().forEach(function (track) {
            track.enabled = !!bool;
        });
    });
};
LocalMedia.prototype._videoEnabled = function (bool) {
    this.localStreams.forEach(function (stream) {
        stream.getVideoTracks().forEach(function (track) {
            track.enabled = !!bool;
        });
    });
};

// check if all audio streams are enabled
LocalMedia.prototype.isAudioEnabled = function () {
    var enabled = true;
    this.localStreams.forEach(function (stream) {
        stream.getAudioTracks().forEach(function (track) {
            enabled = enabled && track.enabled;
        });
    });
    return enabled;
};

// check if all video streams are enabled
LocalMedia.prototype.isVideoEnabled = function () {
    var enabled = true;
    this.localStreams.forEach(function (stream) {
        stream.getVideoTracks().forEach(function (track) {
            enabled = enabled && track.enabled;
        });
    });
    return enabled;
};

LocalMedia.prototype._removeStream = function (stream) {
    var idx = this.localStreams.indexOf(stream);
    if (idx > -1) {
        this.localStreams.splice(idx, 1);
        this.emit('localStreamStopped', stream);
    } else {
        idx = this.localScreens.indexOf(stream);
        if (idx > -1) {
            this.localScreens.splice(idx, 1);
            this.emit('localScreenStopped', stream);
        }
    }
};

LocalMedia.prototype._setupAudioMonitor = function (stream, harkOptions) {
    this._log('Setup audio');
    var audio = hark(stream, harkOptions);
    var self = this;
    var timeout;

    audio.on('speaking', function () {
        self.emit('speaking');
    });

    audio.on('stopped_speaking', function () {
        if (timeout) {
            clearTimeout(timeout);
        }

        timeout = setTimeout(function () {
            self.emit('stoppedSpeaking');
        }, 1000);
    });
    audio.on('volume_change', function (volume, threshold) {
        self.emit('volumeChange', volume, threshold);
    });

    this._audioMonitors.push({audio: audio, stream: stream});
};

LocalMedia.prototype._stopAudioMonitor = function (stream) {
    var idx = -1;
    this._audioMonitors.forEach(function (monitors, i) {
        if (monitors.stream === stream) {
            idx = i;
        }
    });

    if (idx > -1) {
        this._audioMonitors[idx].audio.stop();
        this._audioMonitors.splice(idx, 1);
    }
};

module.exports = LocalMedia;

},{"getscreenmedia":36,"hark":38,"mockconsole":46,"util":73,"wildemitter":75}],45:[function(require,module,exports){
(function (global){
/**
 * lodash (Custom Build) <https://lodash.com/>
 * Build: `lodash modularize exports="npm" -o ./`
 * Copyright jQuery Foundation and other contributors <https://jquery.org/>
 * Released under MIT license <https://lodash.com/license>
 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
 * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 */

/** Used as the size to enable large array optimizations. */
var LARGE_ARRAY_SIZE = 200;

/** Used to stand-in for `undefined` hash values. */
var HASH_UNDEFINED = '__lodash_hash_undefined__';

/** Used as references for various `Number` constants. */
var MAX_SAFE_INTEGER = 9007199254740991;

/** `Object#toString` result references. */
var argsTag = '[object Arguments]',
    arrayTag = '[object Array]',
    boolTag = '[object Boolean]',
    dateTag = '[object Date]',
    errorTag = '[object Error]',
    funcTag = '[object Function]',
    genTag = '[object GeneratorFunction]',
    mapTag = '[object Map]',
    numberTag = '[object Number]',
    objectTag = '[object Object]',
    promiseTag = '[object Promise]',
    regexpTag = '[object RegExp]',
    setTag = '[object Set]',
    stringTag = '[object String]',
    symbolTag = '[object Symbol]',
    weakMapTag = '[object WeakMap]';

var arrayBufferTag = '[object ArrayBuffer]',
    dataViewTag = '[object DataView]',
    float32Tag = '[object Float32Array]',
    float64Tag = '[object Float64Array]',
    int8Tag = '[object Int8Array]',
    int16Tag = '[object Int16Array]',
    int32Tag = '[object Int32Array]',
    uint8Tag = '[object Uint8Array]',
    uint8ClampedTag = '[object Uint8ClampedArray]',
    uint16Tag = '[object Uint16Array]',
    uint32Tag = '[object Uint32Array]';

/**
 * Used to match `RegExp`
 * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
 */
var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;

/** Used to match `RegExp` flags from their coerced string values. */
var reFlags = /\w*$/;

/** Used to detect host constructors (Safari). */
var reIsHostCtor = /^\[object .+?Constructor\]$/;

/** Used to detect unsigned integer values. */
var reIsUint = /^(?:0|[1-9]\d*)$/;

/** Used to identify `toStringTag` values supported by `_.clone`. */
var cloneableTags = {};
cloneableTags[argsTag] = cloneableTags[arrayTag] =
cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
cloneableTags[boolTag] = cloneableTags[dateTag] =
cloneableTags[float32Tag] = cloneableTags[float64Tag] =
cloneableTags[int8Tag] = cloneableTags[int16Tag] =
cloneableTags[int32Tag] = cloneableTags[mapTag] =
cloneableTags[numberTag] = cloneableTags[objectTag] =
cloneableTags[regexpTag] = cloneableTags[setTag] =
cloneableTags[stringTag] = cloneableTags[symbolTag] =
cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
cloneableTags[errorTag] = cloneableTags[funcTag] =
cloneableTags[weakMapTag] = false;

/** Detect free variable `global` from Node.js. */
var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

/** Detect free variable `self`. */
var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

/** Used as a reference to the global object. */
var root = freeGlobal || freeSelf || Function('return this')();

/** Detect free variable `exports`. */
var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;

/** Detect free variable `module`. */
var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;

/** Detect the popular CommonJS extension `module.exports`. */
var moduleExports = freeModule && freeModule.exports === freeExports;

/**
 * Adds the key-value `pair` to `map`.
 *
 * @private
 * @param {Object} map The map to modify.
 * @param {Array} pair The key-value pair to add.
 * @returns {Object} Returns `map`.
 */
function addMapEntry(map, pair) {
  // Don't return `map.set` because it's not chainable in IE 11.
  map.set(pair[0], pair[1]);
  return map;
}

/**
 * Adds `value` to `set`.
 *
 * @private
 * @param {Object} set The set to modify.
 * @param {*} value The value to add.
 * @returns {Object} Returns `set`.
 */
function addSetEntry(set, value) {
  // Don't return `set.add` because it's not chainable in IE 11.
  set.add(value);
  return set;
}

/**
 * A specialized version of `_.forEach` for arrays without support for
 * iteratee shorthands.
 *
 * @private
 * @param {Array} [array] The array to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Array} Returns `array`.
 */
function arrayEach(array, iteratee) {
  var index = -1,
      length = array ? array.length : 0;

  while (++index < length) {
    if (iteratee(array[index], index, array) === false) {
      break;
    }
  }
  return array;
}

/**
 * Appends the elements of `values` to `array`.
 *
 * @private
 * @param {Array} array The array to modify.
 * @param {Array} values The values to append.
 * @returns {Array} Returns `array`.
 */
function arrayPush(array, values) {
  var index = -1,
      length = values.length,
      offset = array.length;

  while (++index < length) {
    array[offset + index] = values[index];
  }
  return array;
}

/**
 * A specialized version of `_.reduce` for arrays without support for
 * iteratee shorthands.
 *
 * @private
 * @param {Array} [array] The array to iterate over.
 * @param {Function} iteratee The function invoked per iteration.
 * @param {*} [accumulator] The initial value.
 * @param {boolean} [initAccum] Specify using the first element of `array` as
 *  the initial value.
 * @returns {*} Returns the accumulated value.
 */
function arrayReduce(array, iteratee, accumulator, initAccum) {
  var index = -1,
      length = array ? array.length : 0;

  if (initAccum && length) {
    accumulator = array[++index];
  }
  while (++index < length) {
    accumulator = iteratee(accumulator, array[index], index, array);
  }
  return accumulator;
}

/**
 * The base implementation of `_.times` without support for iteratee shorthands
 * or max array length checks.
 *
 * @private
 * @param {number} n The number of times to invoke `iteratee`.
 * @param {Function} iteratee The function invoked per iteration.
 * @returns {Array} Returns the array of results.
 */
function baseTimes(n, iteratee) {
  var index = -1,
      result = Array(n);

  while (++index < n) {
    result[index] = iteratee(index);
  }
  return result;
}

/**
 * Gets the value at `key` of `object`.
 *
 * @private
 * @param {Object} [object] The object to query.
 * @param {string} key The key of the property to get.
 * @returns {*} Returns the property value.
 */
function getValue(object, key) {
  return object == null ? undefined : object[key];
}

/**
 * Checks if `value` is a host object in IE < 9.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
 */
function isHostObject(value) {
  // Many host objects are `Object` objects that can coerce to strings
  // despite having improperly defined `toString` methods.
  var result = false;
  if (value != null && typeof value.toString != 'function') {
    try {
      result = !!(value + '');
    } catch (e) {}
  }
  return result;
}

/**
 * Converts `map` to its key-value pairs.
 *
 * @private
 * @param {Object} map The map to convert.
 * @returns {Array} Returns the key-value pairs.
 */
function mapToArray(map) {
  var index = -1,
      result = Array(map.size);

  map.forEach(function(value, key) {
    result[++index] = [key, value];
  });
  return result;
}

/**
 * Creates a unary function that invokes `func` with its argument transformed.
 *
 * @private
 * @param {Function} func The function to wrap.
 * @param {Function} transform The argument transform.
 * @returns {Function} Returns the new function.
 */
function overArg(func, transform) {
  return function(arg) {
    return func(transform(arg));
  };
}

/**
 * Converts `set` to an array of its values.
 *
 * @private
 * @param {Object} set The set to convert.
 * @returns {Array} Returns the values.
 */
function setToArray(set) {
  var index = -1,
      result = Array(set.size);

  set.forEach(function(value) {
    result[++index] = value;
  });
  return result;
}

/** Used for built-in method references. */
var arrayProto = Array.prototype,
    funcProto = Function.prototype,
    objectProto = Object.prototype;

/** Used to detect overreaching core-js shims. */
var coreJsData = root['__core-js_shared__'];

/** Used to detect methods masquerading as native. */
var maskSrcKey = (function() {
  var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
  return uid ? ('Symbol(src)_1.' + uid) : '';
}());

/** Used to resolve the decompiled source of functions. */
var funcToString = funcProto.toString;

/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;

/**
 * Used to resolve the
 * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
 * of values.
 */
var objectToString = objectProto.toString;

/** Used to detect if a method is native. */
var reIsNative = RegExp('^' +
  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
);

/** Built-in value references. */
var Buffer = moduleExports ? root.Buffer : undefined,
    Symbol = root.Symbol,
    Uint8Array = root.Uint8Array,
    getPrototype = overArg(Object.getPrototypeOf, Object),
    objectCreate = Object.create,
    propertyIsEnumerable = objectProto.propertyIsEnumerable,
    splice = arrayProto.splice;

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeGetSymbols = Object.getOwnPropertySymbols,
    nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
    nativeKeys = overArg(Object.keys, Object);

/* Built-in method references that are verified to be native. */
var DataView = getNative(root, 'DataView'),
    Map = getNative(root, 'Map'),
    Promise = getNative(root, 'Promise'),
    Set = getNative(root, 'Set'),
    WeakMap = getNative(root, 'WeakMap'),
    nativeCreate = getNative(Object, 'create');

/** Used to detect maps, sets, and weakmaps. */
var dataViewCtorString = toSource(DataView),
    mapCtorString = toSource(Map),
    promiseCtorString = toSource(Promise),
    setCtorString = toSource(Set),
    weakMapCtorString = toSource(WeakMap);

/** Used to convert symbols to primitives and strings. */
var symbolProto = Symbol ? Symbol.prototype : undefined,
    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;

/**
 * Creates a hash object.
 *
 * @private
 * @constructor
 * @param {Array} [entries] The key-value pairs to cache.
 */
function Hash(entries) {
  var index = -1,
      length = entries ? entries.length : 0;

  this.clear();
  while (++index < length) {
    var entry = entries[index];
    this.set(entry[0], entry[1]);
  }
}

/**
 * Removes all key-value entries from the hash.
 *
 * @private
 * @name clear
 * @memberOf Hash
 */
function hashClear() {
  this.__data__ = nativeCreate ? nativeCreate(null) : {};
}

/**
 * Removes `key` and its value from the hash.
 *
 * @private
 * @name delete
 * @memberOf Hash
 * @param {Object} hash The hash to modify.
 * @param {string} key The key of the value to remove.
 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
 */
function hashDelete(key) {
  return this.has(key) && delete this.__data__[key];
}

/**
 * Gets the hash value for `key`.
 *
 * @private
 * @name get
 * @memberOf Hash
 * @param {string} key The key of the value to get.
 * @returns {*} Returns the entry value.
 */
function hashGet(key) {
  var data = this.__data__;
  if (nativeCreate) {
    var result = data[key];
    return result === HASH_UNDEFINED ? undefined : result;
  }
  return hasOwnProperty.call(data, key) ? data[key] : undefined;
}

/**
 * Checks if a hash value for `key` exists.
 *
 * @private
 * @name has
 * @memberOf Hash
 * @param {string} key The key of the entry to check.
 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
 */
function hashHas(key) {
  var data = this.__data__;
  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
}

/**
 * Sets the hash `key` to `value`.
 *
 * @private
 * @name set
 * @memberOf Hash
 * @param {string} key The key of the value to set.
 * @param {*} value The value to set.
 * @returns {Object} Returns the hash instance.
 */
function hashSet(key, value) {
  var data = this.__data__;
  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
  return this;
}

// Add methods to `Hash`.
Hash.prototype.clear = hashClear;
Hash.prototype['delete'] = hashDelete;
Hash.prototype.get = hashGet;
Hash.prototype.has = hashHas;
Hash.prototype.set = hashSet;

/**
 * Creates an list cache object.
 *
 * @private
 * @constructor
 * @param {Array} [entries] The key-value pairs to cache.
 */
function ListCache(entries) {
  var index = -1,
      length = entries ? entries.length : 0;

  this.clear();
  while (++index < length) {
    var entry = entries[index];
    this.set(entry[0], entry[1]);
  }
}

/**
 * Removes all key-value entries from the list cache.
 *
 * @private
 * @name clear
 * @memberOf ListCache
 */
function listCacheClear() {
  this.__data__ = [];
}

/**
 * Removes `key` and its value from the list cache.
 *
 * @private
 * @name delete
 * @memberOf ListCache
 * @param {string} key The key of the value to remove.
 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
 */
function listCacheDelete(key) {
  var data = this.__data__,
      index = assocIndexOf(data, key);

  if (index < 0) {
    return false;
  }
  var lastIndex = data.length - 1;
  if (index == lastIndex) {
    data.pop();
  } else {
    splice.call(data, index, 1);
  }
  return true;
}

/**
 * Gets the list cache value for `key`.
 *
 * @private
 * @name get
 * @memberOf ListCache
 * @param {string} key The key of the value to get.
 * @returns {*} Returns the entry value.
 */
function listCacheGet(key) {
  var data = this.__data__,
      index = assocIndexOf(data, key);

  return index < 0 ? undefined : data[index][1];
}

/**
 * Checks if a list cache value for `key` exists.
 *
 * @private
 * @name has
 * @memberOf ListCache
 * @param {string} key The key of the entry to check.
 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
 */
function listCacheHas(key) {
  return assocIndexOf(this.__data__, key) > -1;
}

/**
 * Sets the list cache `key` to `value`.
 *
 * @private
 * @name set
 * @memberOf ListCache
 * @param {string} key The key of the value to set.
 * @param {*} value The value to set.
 * @returns {Object} Returns the list cache instance.
 */
function listCacheSet(key, value) {
  var data = this.__data__,
      index = assocIndexOf(data, key);

  if (index < 0) {
    data.push([key, value]);
  } else {
    data[index][1] = value;
  }
  return this;
}

// Add methods to `ListCache`.
ListCache.prototype.clear = listCacheClear;
ListCache.prototype['delete'] = listCacheDelete;
ListCache.prototype.get = listCacheGet;
ListCache.prototype.has = listCacheHas;
ListCache.prototype.set = listCacheSet;

/**
 * Creates a map cache object to store key-value pairs.
 *
 * @private
 * @constructor
 * @param {Array} [entries] The key-value pairs to cache.
 */
function MapCache(entries) {
  var index = -1,
      length = entries ? entries.length : 0;

  this.clear();
  while (++index < length) {
    var entry = entries[index];
    this.set(entry[0], entry[1]);
  }
}

/**
 * Removes all key-value entries from the map.
 *
 * @private
 * @name clear
 * @memberOf MapCache
 */
function mapCacheClear() {
  this.__data__ = {
    'hash': new Hash,
    'map': new (Map || ListCache),
    'string': new Hash
  };
}

/**
 * Removes `key` and its value from the map.
 *
 * @private
 * @name delete
 * @memberOf MapCache
 * @param {string} key The key of the value to remove.
 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
 */
function mapCacheDelete(key) {
  return getMapData(this, key)['delete'](key);
}

/**
 * Gets the map value for `key`.
 *
 * @private
 * @name get
 * @memberOf MapCache
 * @param {string} key The key of the value to get.
 * @returns {*} Returns the entry value.
 */
function mapCacheGet(key) {
  return getMapData(this, key).get(key);
}

/**
 * Checks if a map value for `key` exists.
 *
 * @private
 * @name has
 * @memberOf MapCache
 * @param {string} key The key of the entry to check.
 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
 */
function mapCacheHas(key) {
  return getMapData(this, key).has(key);
}

/**
 * Sets the map `key` to `value`.
 *
 * @private
 * @name set
 * @memberOf MapCache
 * @param {string} key The key of the value to set.
 * @param {*} value The value to set.
 * @returns {Object} Returns the map cache instance.
 */
function mapCacheSet(key, value) {
  getMapData(this, key).set(key, value);
  return this;
}

// Add methods to `MapCache`.
MapCache.prototype.clear = mapCacheClear;
MapCache.prototype['delete'] = mapCacheDelete;
MapCache.prototype.get = mapCacheGet;
MapCache.prototype.has = mapCacheHas;
MapCache.prototype.set = mapCacheSet;

/**
 * Creates a stack cache object to store key-value pairs.
 *
 * @private
 * @constructor
 * @param {Array} [entries] The key-value pairs to cache.
 */
function Stack(entries) {
  this.__data__ = new ListCache(entries);
}

/**
 * Removes all key-value entries from the stack.
 *
 * @private
 * @name clear
 * @memberOf Stack
 */
function stackClear() {
  this.__data__ = new ListCache;
}

/**
 * Removes `key` and its value from the stack.
 *
 * @private
 * @name delete
 * @memberOf Stack
 * @param {string} key The key of the value to remove.
 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
 */
function stackDelete(key) {
  return this.__data__['delete'](key);
}

/**
 * Gets the stack value for `key`.
 *
 * @private
 * @name get
 * @memberOf Stack
 * @param {string} key The key of the value to get.
 * @returns {*} Returns the entry value.
 */
function stackGet(key) {
  return this.__data__.get(key);
}

/**
 * Checks if a stack value for `key` exists.
 *
 * @private
 * @name has
 * @memberOf Stack
 * @param {string} key The key of the entry to check.
 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
 */
function stackHas(key) {
  return this.__data__.has(key);
}

/**
 * Sets the stack `key` to `value`.
 *
 * @private
 * @name set
 * @memberOf Stack
 * @param {string} key The key of the value to set.
 * @param {*} value The value to set.
 * @returns {Object} Returns the stack cache instance.
 */
function stackSet(key, value) {
  var cache = this.__data__;
  if (cache instanceof ListCache) {
    var pairs = cache.__data__;
    if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
      pairs.push([key, value]);
      return this;
    }
    cache = this.__data__ = new MapCache(pairs);
  }
  cache.set(key, value);
  return this;
}

// Add methods to `Stack`.
Stack.prototype.clear = stackClear;
Stack.prototype['delete'] = stackDelete;
Stack.prototype.get = stackGet;
Stack.prototype.has = stackHas;
Stack.prototype.set = stackSet;

/**
 * Creates an array of the enumerable property names of the array-like `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @param {boolean} inherited Specify returning inherited property names.
 * @returns {Array} Returns the array of property names.
 */
function arrayLikeKeys(value, inherited) {
  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
  // Safari 9 makes `arguments.length` enumerable in strict mode.
  var result = (isArray(value) || isArguments(value))
    ? baseTimes(value.length, String)
    : [];

  var length = result.length,
      skipIndexes = !!length;

  for (var key in value) {
    if ((inherited || hasOwnProperty.call(value, key)) &&
        !(skipIndexes && (key == 'length' || isIndex(key, length)))) {
      result.push(key);
    }
  }
  return result;
}

/**
 * Assigns `value` to `key` of `object` if the existing value is not equivalent
 * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
 * for equality comparisons.
 *
 * @private
 * @param {Object} object The object to modify.
 * @param {string} key The key of the property to assign.
 * @param {*} value The value to assign.
 */
function assignValue(object, key, value) {
  var objValue = object[key];
  if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
      (value === undefined && !(key in object))) {
    object[key] = value;
  }
}

/**
 * Gets the index at which the `key` is found in `array` of key-value pairs.
 *
 * @private
 * @param {Array} array The array to inspect.
 * @param {*} key The key to search for.
 * @returns {number} Returns the index of the matched value, else `-1`.
 */
function assocIndexOf(array, key) {
  var length = array.length;
  while (length--) {
    if (eq(array[length][0], key)) {
      return length;
    }
  }
  return -1;
}

/**
 * The base implementation of `_.assign` without support for multiple sources
 * or `customizer` functions.
 *
 * @private
 * @param {Object} object The destination object.
 * @param {Object} source The source object.
 * @returns {Object} Returns `object`.
 */
function baseAssign(object, source) {
  return object && copyObject(source, keys(source), object);
}

/**
 * The base implementation of `_.clone` and `_.cloneDeep` which tracks
 * traversed objects.
 *
 * @private
 * @param {*} value The value to clone.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @param {boolean} [isFull] Specify a clone including symbols.
 * @param {Function} [customizer] The function to customize cloning.
 * @param {string} [key] The key of `value`.
 * @param {Object} [object] The parent object of `value`.
 * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
 * @returns {*} Returns the cloned value.
 */
function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
  var result;
  if (customizer) {
    result = object ? customizer(value, key, object, stack) : customizer(value);
  }
  if (result !== undefined) {
    return result;
  }
  if (!isObject(value)) {
    return value;
  }
  var isArr = isArray(value);
  if (isArr) {
    result = initCloneArray(value);
    if (!isDeep) {
      return copyArray(value, result);
    }
  } else {
    var tag = getTag(value),
        isFunc = tag == funcTag || tag == genTag;

    if (isBuffer(value)) {
      return cloneBuffer(value, isDeep);
    }
    if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
      if (isHostObject(value)) {
        return object ? value : {};
      }
      result = initCloneObject(isFunc ? {} : value);
      if (!isDeep) {
        return copySymbols(value, baseAssign(result, value));
      }
    } else {
      if (!cloneableTags[tag]) {
        return object ? value : {};
      }
      result = initCloneByTag(value, tag, baseClone, isDeep);
    }
  }
  // Check for circular references and return its corresponding clone.
  stack || (stack = new Stack);
  var stacked = stack.get(value);
  if (stacked) {
    return stacked;
  }
  stack.set(value, result);

  if (!isArr) {
    var props = isFull ? getAllKeys(value) : keys(value);
  }
  arrayEach(props || value, function(subValue, key) {
    if (props) {
      key = subValue;
      subValue = value[key];
    }
    // Recursively populate clone (susceptible to call stack limits).
    assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
  });
  return result;
}

/**
 * The base implementation of `_.create` without support for assigning
 * properties to the created object.
 *
 * @private
 * @param {Object} prototype The object to inherit from.
 * @returns {Object} Returns the new object.
 */
function baseCreate(proto) {
  return isObject(proto) ? objectCreate(proto) : {};
}

/**
 * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
 * `keysFunc` and `symbolsFunc` to get the enumerable property names and
 * symbols of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Function} keysFunc The function to get the keys of `object`.
 * @param {Function} symbolsFunc The function to get the symbols of `object`.
 * @returns {Array} Returns the array of property names and symbols.
 */
function baseGetAllKeys(object, keysFunc, symbolsFunc) {
  var result = keysFunc(object);
  return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
}

/**
 * The base implementation of `getTag`.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the `toStringTag`.
 */
function baseGetTag(value) {
  return objectToString.call(value);
}

/**
 * The base implementation of `_.isNative` without bad shim checks.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a native function,
 *  else `false`.
 */
function baseIsNative(value) {
  if (!isObject(value) || isMasked(value)) {
    return false;
  }
  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
  return pattern.test(toSource(value));
}

/**
 * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
 *
 * @private
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of property names.
 */
function baseKeys(object) {
  if (!isPrototype(object)) {
    return nativeKeys(object);
  }
  var result = [];
  for (var key in Object(object)) {
    if (hasOwnProperty.call(object, key) && key != 'constructor') {
      result.push(key);
    }
  }
  return result;
}

/**
 * Creates a clone of  `buffer`.
 *
 * @private
 * @param {Buffer} buffer The buffer to clone.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Buffer} Returns the cloned buffer.
 */
function cloneBuffer(buffer, isDeep) {
  if (isDeep) {
    return buffer.slice();
  }
  var result = new buffer.constructor(buffer.length);
  buffer.copy(result);
  return result;
}

/**
 * Creates a clone of `arrayBuffer`.
 *
 * @private
 * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
 * @returns {ArrayBuffer} Returns the cloned array buffer.
 */
function cloneArrayBuffer(arrayBuffer) {
  var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
  new Uint8Array(result).set(new Uint8Array(arrayBuffer));
  return result;
}

/**
 * Creates a clone of `dataView`.
 *
 * @private
 * @param {Object} dataView The data view to clone.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the cloned data view.
 */
function cloneDataView(dataView, isDeep) {
  var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
  return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
}

/**
 * Creates a clone of `map`.
 *
 * @private
 * @param {Object} map The map to clone.
 * @param {Function} cloneFunc The function to clone values.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the cloned map.
 */
function cloneMap(map, isDeep, cloneFunc) {
  var array = isDeep ? cloneFunc(mapToArray(map), true) : mapToArray(map);
  return arrayReduce(array, addMapEntry, new map.constructor);
}

/**
 * Creates a clone of `regexp`.
 *
 * @private
 * @param {Object} regexp The regexp to clone.
 * @returns {Object} Returns the cloned regexp.
 */
function cloneRegExp(regexp) {
  var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
  result.lastIndex = regexp.lastIndex;
  return result;
}

/**
 * Creates a clone of `set`.
 *
 * @private
 * @param {Object} set The set to clone.
 * @param {Function} cloneFunc The function to clone values.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the cloned set.
 */
function cloneSet(set, isDeep, cloneFunc) {
  var array = isDeep ? cloneFunc(setToArray(set), true) : setToArray(set);
  return arrayReduce(array, addSetEntry, new set.constructor);
}

/**
 * Creates a clone of the `symbol` object.
 *
 * @private
 * @param {Object} symbol The symbol object to clone.
 * @returns {Object} Returns the cloned symbol object.
 */
function cloneSymbol(symbol) {
  return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
}

/**
 * Creates a clone of `typedArray`.
 *
 * @private
 * @param {Object} typedArray The typed array to clone.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the cloned typed array.
 */
function cloneTypedArray(typedArray, isDeep) {
  var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
  return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
}

/**
 * Copies the values of `source` to `array`.
 *
 * @private
 * @param {Array} source The array to copy values from.
 * @param {Array} [array=[]] The array to copy values to.
 * @returns {Array} Returns `array`.
 */
function copyArray(source, array) {
  var index = -1,
      length = source.length;

  array || (array = Array(length));
  while (++index < length) {
    array[index] = source[index];
  }
  return array;
}

/**
 * Copies properties of `source` to `object`.
 *
 * @private
 * @param {Object} source The object to copy properties from.
 * @param {Array} props The property identifiers to copy.
 * @param {Object} [object={}] The object to copy properties to.
 * @param {Function} [customizer] The function to customize copied values.
 * @returns {Object} Returns `object`.
 */
function copyObject(source, props, object, customizer) {
  object || (object = {});

  var index = -1,
      length = props.length;

  while (++index < length) {
    var key = props[index];

    var newValue = customizer
      ? customizer(object[key], source[key], key, object, source)
      : undefined;

    assignValue(object, key, newValue === undefined ? source[key] : newValue);
  }
  return object;
}

/**
 * Copies own symbol properties of `source` to `object`.
 *
 * @private
 * @param {Object} source The object to copy symbols from.
 * @param {Object} [object={}] The object to copy symbols to.
 * @returns {Object} Returns `object`.
 */
function copySymbols(source, object) {
  return copyObject(source, getSymbols(source), object);
}

/**
 * Creates an array of own enumerable property names and symbols of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of property names and symbols.
 */
function getAllKeys(object) {
  return baseGetAllKeys(object, keys, getSymbols);
}

/**
 * Gets the data for `map`.
 *
 * @private
 * @param {Object} map The map to query.
 * @param {string} key The reference key.
 * @returns {*} Returns the map data.
 */
function getMapData(map, key) {
  var data = map.__data__;
  return isKeyable(key)
    ? data[typeof key == 'string' ? 'string' : 'hash']
    : data.map;
}

/**
 * Gets the native function at `key` of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {string} key The key of the method to get.
 * @returns {*} Returns the function if it's native, else `undefined`.
 */
function getNative(object, key) {
  var value = getValue(object, key);
  return baseIsNative(value) ? value : undefined;
}

/**
 * Creates an array of the own enumerable symbol properties of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of symbols.
 */
var getSymbols = nativeGetSymbols ? overArg(nativeGetSymbols, Object) : stubArray;

/**
 * Gets the `toStringTag` of `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {string} Returns the `toStringTag`.
 */
var getTag = baseGetTag;

// Fallback for data views, maps, sets, and weak maps in IE 11,
// for data views in Edge < 14, and promises in Node.js.
if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
    (Map && getTag(new Map) != mapTag) ||
    (Promise && getTag(Promise.resolve()) != promiseTag) ||
    (Set && getTag(new Set) != setTag) ||
    (WeakMap && getTag(new WeakMap) != weakMapTag)) {
  getTag = function(value) {
    var result = objectToString.call(value),
        Ctor = result == objectTag ? value.constructor : undefined,
        ctorString = Ctor ? toSource(Ctor) : undefined;

    if (ctorString) {
      switch (ctorString) {
        case dataViewCtorString: return dataViewTag;
        case mapCtorString: return mapTag;
        case promiseCtorString: return promiseTag;
        case setCtorString: return setTag;
        case weakMapCtorString: return weakMapTag;
      }
    }
    return result;
  };
}

/**
 * Initializes an array clone.
 *
 * @private
 * @param {Array} array The array to clone.
 * @returns {Array} Returns the initialized clone.
 */
function initCloneArray(array) {
  var length = array.length,
      result = array.constructor(length);

  // Add properties assigned by `RegExp#exec`.
  if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
    result.index = array.index;
    result.input = array.input;
  }
  return result;
}

/**
 * Initializes an object clone.
 *
 * @private
 * @param {Object} object The object to clone.
 * @returns {Object} Returns the initialized clone.
 */
function initCloneObject(object) {
  return (typeof object.constructor == 'function' && !isPrototype(object))
    ? baseCreate(getPrototype(object))
    : {};
}

/**
 * Initializes an object clone based on its `toStringTag`.
 *
 * **Note:** This function only supports cloning values with tags of
 * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
 *
 * @private
 * @param {Object} object The object to clone.
 * @param {string} tag The `toStringTag` of the object to clone.
 * @param {Function} cloneFunc The function to clone values.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the initialized clone.
 */
function initCloneByTag(object, tag, cloneFunc, isDeep) {
  var Ctor = object.constructor;
  switch (tag) {
    case arrayBufferTag:
      return cloneArrayBuffer(object);

    case boolTag:
    case dateTag:
      return new Ctor(+object);

    case dataViewTag:
      return cloneDataView(object, isDeep);

    case float32Tag: case float64Tag:
    case int8Tag: case int16Tag: case int32Tag:
    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
      return cloneTypedArray(object, isDeep);

    case mapTag:
      return cloneMap(object, isDeep, cloneFunc);

    case numberTag:
    case stringTag:
      return new Ctor(object);

    case regexpTag:
      return cloneRegExp(object);

    case setTag:
      return cloneSet(object, isDeep, cloneFunc);

    case symbolTag:
      return cloneSymbol(object);
  }
}

/**
 * Checks if `value` is a valid array-like index.
 *
 * @private
 * @param {*} value The value to check.
 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
 */
function isIndex(value, length) {
  length = length == null ? MAX_SAFE_INTEGER : length;
  return !!length &&
    (typeof value == 'number' || reIsUint.test(value)) &&
    (value > -1 && value % 1 == 0 && value < length);
}

/**
 * Checks if `value` is suitable for use as unique object key.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
 */
function isKeyable(value) {
  var type = typeof value;
  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
    ? (value !== '__proto__')
    : (value === null);
}

/**
 * Checks if `func` has its source masked.
 *
 * @private
 * @param {Function} func The function to check.
 * @returns {boolean} Returns `true` if `func` is masked, else `false`.
 */
function isMasked(func) {
  return !!maskSrcKey && (maskSrcKey in func);
}

/**
 * Checks if `value` is likely a prototype object.
 *
 * @private
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
 */
function isPrototype(value) {
  var Ctor = value && value.constructor,
      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;

  return value === proto;
}

/**
 * Converts `func` to its source code.
 *
 * @private
 * @param {Function} func The function to process.
 * @returns {string} Returns the source code.
 */
function toSource(func) {
  if (func != null) {
    try {
      return funcToString.call(func);
    } catch (e) {}
    try {
      return (func + '');
    } catch (e) {}
  }
  return '';
}

/**
 * This method is like `_.clone` except that it recursively clones `value`.
 *
 * @static
 * @memberOf _
 * @since 1.0.0
 * @category Lang
 * @param {*} value The value to recursively clone.
 * @returns {*} Returns the deep cloned value.
 * @see _.clone
 * @example
 *
 * var objects = [{ 'a': 1 }, { 'b': 2 }];
 *
 * var deep = _.cloneDeep(objects);
 * console.log(deep[0] === objects[0]);
 * // => false
 */
function cloneDeep(value) {
  return baseClone(value, true, true);
}

/**
 * Performs a
 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
 * comparison between two values to determine if they are equivalent.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to compare.
 * @param {*} other The other value to compare.
 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
 * @example
 *
 * var object = { 'a': 1 };
 * var other = { 'a': 1 };
 *
 * _.eq(object, object);
 * // => true
 *
 * _.eq(object, other);
 * // => false
 *
 * _.eq('a', 'a');
 * // => true
 *
 * _.eq('a', Object('a'));
 * // => false
 *
 * _.eq(NaN, NaN);
 * // => true
 */
function eq(value, other) {
  return value === other || (value !== value && other !== other);
}

/**
 * Checks if `value` is likely an `arguments` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
 *  else `false`.
 * @example
 *
 * _.isArguments(function() { return arguments; }());
 * // => true
 *
 * _.isArguments([1, 2, 3]);
 * // => false
 */
function isArguments(value) {
  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
  return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
    (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
}

/**
 * Checks if `value` is classified as an `Array` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an array, else `false`.
 * @example
 *
 * _.isArray([1, 2, 3]);
 * // => true
 *
 * _.isArray(document.body.children);
 * // => false
 *
 * _.isArray('abc');
 * // => false
 *
 * _.isArray(_.noop);
 * // => false
 */
var isArray = Array.isArray;

/**
 * Checks if `value` is array-like. A value is considered array-like if it's
 * not a function and has a `value.length` that's an integer greater than or
 * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
 * @example
 *
 * _.isArrayLike([1, 2, 3]);
 * // => true
 *
 * _.isArrayLike(document.body.children);
 * // => true
 *
 * _.isArrayLike('abc');
 * // => true
 *
 * _.isArrayLike(_.noop);
 * // => false
 */
function isArrayLike(value) {
  return value != null && isLength(value.length) && !isFunction(value);
}

/**
 * This method is like `_.isArrayLike` except that it also checks if `value`
 * is an object.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an array-like object,
 *  else `false`.
 * @example
 *
 * _.isArrayLikeObject([1, 2, 3]);
 * // => true
 *
 * _.isArrayLikeObject(document.body.children);
 * // => true
 *
 * _.isArrayLikeObject('abc');
 * // => false
 *
 * _.isArrayLikeObject(_.noop);
 * // => false
 */
function isArrayLikeObject(value) {
  return isObjectLike(value) && isArrayLike(value);
}

/**
 * Checks if `value` is a buffer.
 *
 * @static
 * @memberOf _
 * @since 4.3.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
 * @example
 *
 * _.isBuffer(new Buffer(2));
 * // => true
 *
 * _.isBuffer(new Uint8Array(2));
 * // => false
 */
var isBuffer = nativeIsBuffer || stubFalse;

/**
 * Checks if `value` is classified as a `Function` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a function, else `false`.
 * @example
 *
 * _.isFunction(_);
 * // => true
 *
 * _.isFunction(/abc/);
 * // => false
 */
function isFunction(value) {
  // The use of `Object#toString` avoids issues with the `typeof` operator
  // in Safari 8-9 which returns 'object' for typed array and other constructors.
  var tag = isObject(value) ? objectToString.call(value) : '';
  return tag == funcTag || tag == genTag;
}

/**
 * Checks if `value` is a valid array-like length.
 *
 * **Note:** This method is loosely based on
 * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
 * @example
 *
 * _.isLength(3);
 * // => true
 *
 * _.isLength(Number.MIN_VALUE);
 * // => false
 *
 * _.isLength(Infinity);
 * // => false
 *
 * _.isLength('3');
 * // => false
 */
function isLength(value) {
  return typeof value == 'number' &&
    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
}

/**
 * Checks if `value` is the
 * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
 * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is an object, else `false`.
 * @example
 *
 * _.isObject({});
 * // => true
 *
 * _.isObject([1, 2, 3]);
 * // => true
 *
 * _.isObject(_.noop);
 * // => true
 *
 * _.isObject(null);
 * // => false
 */
function isObject(value) {
  var type = typeof value;
  return !!value && (type == 'object' || type == 'function');
}

/**
 * Checks if `value` is object-like. A value is object-like if it's not `null`
 * and has a `typeof` result of "object".
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
 * @example
 *
 * _.isObjectLike({});
 * // => true
 *
 * _.isObjectLike([1, 2, 3]);
 * // => true
 *
 * _.isObjectLike(_.noop);
 * // => false
 *
 * _.isObjectLike(null);
 * // => false
 */
function isObjectLike(value) {
  return !!value && typeof value == 'object';
}

/**
 * Creates an array of the own enumerable property names of `object`.
 *
 * **Note:** Non-object values are coerced to objects. See the
 * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
 * for more details.
 *
 * @static
 * @since 0.1.0
 * @memberOf _
 * @category Object
 * @param {Object} object The object to query.
 * @returns {Array} Returns the array of property names.
 * @example
 *
 * function Foo() {
 *   this.a = 1;
 *   this.b = 2;
 * }
 *
 * Foo.prototype.c = 3;
 *
 * _.keys(new Foo);
 * // => ['a', 'b'] (iteration order is not guaranteed)
 *
 * _.keys('hi');
 * // => ['0', '1']
 */
function keys(object) {
  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
}

/**
 * This method returns a new empty array.
 *
 * @static
 * @memberOf _
 * @since 4.13.0
 * @category Util
 * @returns {Array} Returns the new empty array.
 * @example
 *
 * var arrays = _.times(2, _.stubArray);
 *
 * console.log(arrays);
 * // => [[], []]
 *
 * console.log(arrays[0] === arrays[1]);
 * // => false
 */
function stubArray() {
  return [];
}

/**
 * This method returns `false`.
 *
 * @static
 * @memberOf _
 * @since 4.13.0
 * @category Util
 * @returns {boolean} Returns `false`.
 * @example
 *
 * _.times(2, _.stubFalse);
 * // => [false, false]
 */
function stubFalse() {
  return false;
}

module.exports = cloneDeep;

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],46:[function(require,module,exports){
var methods = "assert,count,debug,dir,dirxml,error,exception,group,groupCollapsed,groupEnd,info,log,markTimeline,profile,profileEnd,time,timeEnd,trace,warn".split(",");
var l = methods.length;
var fn = function () {};
var mockconsole = {};

while (l--) {
    mockconsole[methods[l]] = fn;
}

module.exports = mockconsole;

},{}],47:[function(require,module,exports){
/**
 * Helpers.
 */

var s = 1000;
var m = s * 60;
var h = m * 60;
var d = h * 24;
var y = d * 365.25;

/**
 * Parse or format the given `val`.
 *
 * Options:
 *
 *  - `long` verbose formatting [false]
 *
 * @param {String|Number} val
 * @param {Object} options
 * @return {String|Number}
 * @api public
 */

module.exports = function(val, options){
  options = options || {};
  if ('string' == typeof val) return parse(val);
  return options.long
    ? long(val)
    : short(val);
};

/**
 * Parse the given `str` and return milliseconds.
 *
 * @param {String} str
 * @return {Number}
 * @api private
 */

function parse(str) {
  var match = /^((?:\d+)?\.?\d+) *(ms|seconds?|s|minutes?|m|hours?|h|days?|d|years?|y)?$/i.exec(str);
  if (!match) return;
  var n = parseFloat(match[1]);
  var type = (match[2] || 'ms').toLowerCase();
  switch (type) {
    case 'years':
    case 'year':
    case 'y':
      return n * y;
    case 'days':
    case 'day':
    case 'd':
      return n * d;
    case 'hours':
    case 'hour':
    case 'h':
      return n * h;
    case 'minutes':
    case 'minute':
    case 'm':
      return n * m;
    case 'seconds':
    case 'second':
    case 's':
      return n * s;
    case 'ms':
      return n;
  }
}

/**
 * Short format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function short(ms) {
  if (ms >= d) return Math.round(ms / d) + 'd';
  if (ms >= h) return Math.round(ms / h) + 'h';
  if (ms >= m) return Math.round(ms / m) + 'm';
  if (ms >= s) return Math.round(ms / s) + 's';
  return ms + 'ms';
}

/**
 * Long format for `ms`.
 *
 * @param {Number} ms
 * @return {String}
 * @api private
 */

function long(ms) {
  return plural(ms, d, 'day')
    || plural(ms, h, 'hour')
    || plural(ms, m, 'minute')
    || plural(ms, s, 'second')
    || ms + ' ms';
}

/**
 * Pluralization helper.
 */

function plural(ms, n, name) {
  if (ms < n) return;
  if (ms < n * 1.5) return Math.floor(ms / n) + ' ' + name;
  return Math.ceil(ms / n) + ' ' + name + 's';
}

},{}],48:[function(require,module,exports){

/**
 * HOP ref.
 */

var has = Object.prototype.hasOwnProperty;

/**
 * Return own keys in `obj`.
 *
 * @param {Object} obj
 * @return {Array}
 * @api public
 */

exports.keys = Object.keys || function(obj){
  var keys = [];
  for (var key in obj) {
    if (has.call(obj, key)) {
      keys.push(key);
    }
  }
  return keys;
};

/**
 * Return own values in `obj`.
 *
 * @param {Object} obj
 * @return {Array}
 * @api public
 */

exports.values = function(obj){
  var vals = [];
  for (var key in obj) {
    if (has.call(obj, key)) {
      vals.push(obj[key]);
    }
  }
  return vals;
};

/**
 * Merge `b` into `a`.
 *
 * @param {Object} a
 * @param {Object} b
 * @return {Object} a
 * @api public
 */

exports.merge = function(a, b){
  for (var key in b) {
    if (has.call(b, key)) {
      a[key] = b[key];
    }
  }
  return a;
};

/**
 * Return length of `obj`.
 *
 * @param {Object} obj
 * @return {Number}
 * @api public
 */

exports.length = function(obj){
  return exports.keys(obj).length;
};

/**
 * Check if `obj` is empty.
 *
 * @param {Object} obj
 * @return {Boolean}
 * @api public
 */

exports.isEmpty = function(obj){
  return 0 == exports.length(obj);
};
},{}],49:[function(require,module,exports){
(function (global){
/**
 * JSON parse.
 *
 * @see Based on jQuery#parseJSON (MIT) and JSON2
 * @api private
 */

var rvalidchars = /^[\],:{}\s]*$/;
var rvalidescape = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
var rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
var rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g;
var rtrimLeft = /^\s+/;
var rtrimRight = /\s+$/;

module.exports = function parsejson(data) {
  if ('string' != typeof data || !data) {
    return null;
  }

  data = data.replace(rtrimLeft, '').replace(rtrimRight, '');

  // Attempt to parse using the native JSON parser first
  if (global.JSON && JSON.parse) {
    return JSON.parse(data);
  }

  if (rvalidchars.test(data.replace(rvalidescape, '@')
      .replace(rvalidtokens, ']')
      .replace(rvalidbraces, ''))) {
    return (new Function('return ' + data))();
  }
};
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],50:[function(require,module,exports){
/**
 * Compiles a querystring
 * Returns string representation of the object
 *
 * @param {Object}
 * @api private
 */

exports.encode = function (obj) {
  var str = '';

  for (var i in obj) {
    if (obj.hasOwnProperty(i)) {
      if (str.length) str += '&';
      str += encodeURIComponent(i) + '=' + encodeURIComponent(obj[i]);
    }
  }

  return str;
};

/**
 * Parses a simple querystring into an object
 *
 * @param {String} qs
 * @api private
 */

exports.decode = function(qs){
  var qry = {};
  var pairs = qs.split('&');
  for (var i = 0, l = pairs.length; i < l; i++) {
    var pair = pairs[i].split('=');
    qry[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1]);
  }
  return qry;
};

},{}],51:[function(require,module,exports){
/**
 * Parses an URI
 *
 * @author Steven Levithan <stevenlevithan.com> (MIT license)
 * @api private
 */

var re = /^(?:(?![^:@]+:[^:@\/]*@)(http|https|ws|wss):\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?((?:[a-f0-9]{0,4}:){2,7}[a-f0-9]{0,4}|[^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;

var parts = [
    'source', 'protocol', 'authority', 'userInfo', 'user', 'password', 'host'
  , 'port', 'relative', 'path', 'directory', 'file', 'query', 'anchor'
];

module.exports = function parseuri(str) {
  var m = re.exec(str || '')
    , uri = {}
    , i = 14;

  while (i--) {
    uri[parts[i]] = m[i] || '';
  }

  return uri;
};

},{}],52:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
(function () {
    try {
        if (typeof setTimeout === 'function') {
            cachedSetTimeout = setTimeout;
        } else {
            cachedSetTimeout = defaultSetTimout;
        }
    } catch (e) {
        cachedSetTimeout = defaultSetTimout;
    }
    try {
        if (typeof clearTimeout === 'function') {
            cachedClearTimeout = clearTimeout;
        } else {
            cachedClearTimeout = defaultClearTimeout;
        }
    } catch (e) {
        cachedClearTimeout = defaultClearTimeout;
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) { return [] }

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],53:[function(require,module,exports){
var util = require('util');
var SJJ = require('sdp-jingle-json');
var WildEmitter = require('wildemitter');
var cloneDeep = require('lodash.clonedeep');

function PeerConnection(config, constraints) {
    var self = this;
    var item;
    WildEmitter.call(this);

    config = config || {};
    config.iceServers = config.iceServers || [];

    // make sure this only gets enabled in Google Chrome
    // EXPERIMENTAL FLAG, might get removed without notice
    this.enableChromeNativeSimulcast = false;
    if (constraints && constraints.optional && window.chrome &&
            navigator.appVersion.match(/Chromium\//) === null) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.enableChromeNativeSimulcast) {
                self.enableChromeNativeSimulcast = true;
            }
        });
    }

    // EXPERIMENTAL FLAG, might get removed without notice
    this.enableMultiStreamHacks = false;
    if (constraints && constraints.optional && window.chrome) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.enableMultiStreamHacks) {
                self.enableMultiStreamHacks = true;
            }
        });
    }
    // EXPERIMENTAL FLAG, might get removed without notice
    this.restrictBandwidth = 0;
    if (constraints && constraints.optional) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.andyetRestrictBandwidth) {
                self.restrictBandwidth = constraint.andyetRestrictBandwidth;
            }
        });
    }

    // EXPERIMENTAL FLAG, might get removed without notice
    // bundle up ice candidates, only works for jingle mode
    // number > 0 is the delay to wait for additional candidates
    // ~20ms seems good
    this.batchIceCandidates = 0;
    if (constraints && constraints.optional) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.andyetBatchIce) {
                self.batchIceCandidates = constraint.andyetBatchIce;
            }
        });
    }
    this.batchedIceCandidates = [];

    // EXPERIMENTAL FLAG, might get removed without notice
    // this attemps to strip out candidates with an already known foundation
    // and type -- i.e. those which are gathered via the same TURN server
    // but different transports (TURN udp, tcp and tls respectively)
    if (constraints && constraints.optional && window.chrome) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.andyetFasterICE) {
                self.eliminateDuplicateCandidates = constraint.andyetFasterICE;
            }
        });
    }
    // EXPERIMENTAL FLAG, might get removed without notice
    // when using a server such as the jitsi videobridge we don't need to signal
    // our candidates
    if (constraints && constraints.optional) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.andyetDontSignalCandidates) {
                self.dontSignalCandidates = constraint.andyetDontSignalCandidates;
            }
        });
    }


    // EXPERIMENTAL FLAG, might get removed without notice
    this.assumeSetLocalSuccess = false;
    if (constraints && constraints.optional) {
        constraints.optional.forEach(function (constraint) {
            if (constraint.andyetAssumeSetLocalSuccess) {
                self.assumeSetLocalSuccess = constraint.andyetAssumeSetLocalSuccess;
            }
        });
    }

    // EXPERIMENTAL FLAG, might get removed without notice
    // working around https://bugzilla.mozilla.org/show_bug.cgi?id=1087551
    // pass in a timeout for this
    if (window.navigator.mozGetUserMedia) {
        if (constraints && constraints.optional) {
            this.wtFirefox = 0;
            constraints.optional.forEach(function (constraint) {
                if (constraint.andyetFirefoxMakesMeSad) {
                    self.wtFirefox = constraint.andyetFirefoxMakesMeSad;
                    if (self.wtFirefox > 0) {
                        self.firefoxcandidatebuffer = [];
                    }
                }
            });
        }
    }


    this.pc = new RTCPeerConnection(config, constraints);

    if (typeof this.pc.getLocalStreams === 'function') {
        this.getLocalStreams = this.pc.getLocalStreams.bind(this.pc);
    } else {
        this.getLocalStreams = function () {
            return [];
        };
    }

    this.getRemoteStreams = this.pc.getRemoteStreams.bind(this.pc);
    this.addStream = this.pc.addStream.bind(this.pc);

    this.removeStream = function (stream) {
        if (typeof self.pc.removeStream === 'function') {
            self.pc.removeStream.apply(self.pc, arguments);
        } else if (typeof self.pc.removeTrack === 'function') {
            stream.getTracks().forEach(function (track) {
                self.pc.removeTrack(track);
            });
        }
    };

    if (typeof this.pc.removeTrack === 'function') {
        this.removeTrack = this.pc.removeTrack.bind(this.pc);
    }

    // proxy some events directly
    this.pc.onremovestream = this.emit.bind(this, 'removeStream');
    this.pc.onremovetrack = this.emit.bind(this, 'removeTrack');
    this.pc.onaddstream = this.emit.bind(this, 'addStream');
    this.pc.onnegotiationneeded = this.emit.bind(this, 'negotiationNeeded');
    this.pc.oniceconnectionstatechange = this.emit.bind(this, 'iceConnectionStateChange');
    this.pc.onsignalingstatechange = this.emit.bind(this, 'signalingStateChange');

    // handle ice candidate and data channel events
    this.pc.onicecandidate = this._onIce.bind(this);
    this.pc.ondatachannel = this._onDataChannel.bind(this);

    this.localDescription = {
        contents: []
    };
    this.remoteDescription = {
        contents: []
    };

    this.config = {
        debug: false,
        sid: '',
        isInitiator: true,
        sdpSessionID: Date.now(),
        useJingle: false
    };

    this.iceCredentials = {
        local: {},
        remote: {}
    };

    // apply our config
    for (item in config) {
        this.config[item] = config[item];
    }

    if (this.config.debug) {
        this.on('*', function () {
            var logger = config.logger || console;
            logger.log('PeerConnection event:', arguments);
        });
    }
    this.hadLocalStunCandidate = false;
    this.hadRemoteStunCandidate = false;
    this.hadLocalRelayCandidate = false;
    this.hadRemoteRelayCandidate = false;

    this.hadLocalIPv6Candidate = false;
    this.hadRemoteIPv6Candidate = false;

    // keeping references for all our data channels
    // so they dont get garbage collected
    // can be removed once the following bugs have been fixed
    // https://crbug.com/405545
    // https://bugzilla.mozilla.org/show_bug.cgi?id=964092
    // to be filed for opera
    this._remoteDataChannels = [];
    this._localDataChannels = [];

    this._candidateBuffer = [];
}

util.inherits(PeerConnection, WildEmitter);

Object.defineProperty(PeerConnection.prototype, 'signalingState', {
    get: function () {
        return this.pc.signalingState;
    }
});
Object.defineProperty(PeerConnection.prototype, 'iceConnectionState', {
    get: function () {
        return this.pc.iceConnectionState;
    }
});

PeerConnection.prototype._role = function () {
    return this.isInitiator ? 'initiator' : 'responder';
};

// Add a stream to the peer connection object
PeerConnection.prototype.addStream = function (stream) {
    this.localStream = stream;
    this.pc.addStream(stream);
};

// helper function to check if a remote candidate is a stun/relay
// candidate or an ipv6 candidate
PeerConnection.prototype._checkLocalCandidate = function (candidate) {
    var cand = SJJ.toCandidateJSON(candidate);
    if (cand.type == 'srflx') {
        this.hadLocalStunCandidate = true;
    } else if (cand.type == 'relay') {
        this.hadLocalRelayCandidate = true;
    }
    if (cand.ip.indexOf(':') != -1) {
        this.hadLocalIPv6Candidate = true;
    }
};

// helper function to check if a remote candidate is a stun/relay
// candidate or an ipv6 candidate
PeerConnection.prototype._checkRemoteCandidate = function (candidate) {
    var cand = SJJ.toCandidateJSON(candidate);
    if (cand.type == 'srflx') {
        this.hadRemoteStunCandidate = true;
    } else if (cand.type == 'relay') {
        this.hadRemoteRelayCandidate = true;
    }
    if (cand.ip.indexOf(':') != -1) {
        this.hadRemoteIPv6Candidate = true;
    }
};


// Init and add ice candidate object with correct constructor
PeerConnection.prototype.processIce = function (update, cb) {
    cb = cb || function () {};
    var self = this;

    // ignore any added ice candidates to avoid errors. why does the
    // spec not do this?
    if (this.pc.signalingState === 'closed') return cb();

    if (update.contents || (update.jingle && update.jingle.contents)) {
        var contentNames = this.remoteDescription.contents.map(function (c) { return c.name; });
        var contents = update.contents || update.jingle.contents;

        contents.forEach(function (content) {
            var transport = content.transport || {};
            var candidates = transport.candidates || [];
            var mline = contentNames.indexOf(content.name);
            var mid = content.name;
            var remoteContent = self.remoteDescription.contents.find(function (c) {
                return c.name === content.name;
            });

            // process candidates as a callback, in case we need to
            // update ufrag and pwd with offer/answer
            var processCandidates = function () {
                candidates.forEach(
                    function (candidate) {
                    var iceCandidate = SJJ.toCandidateSDP(candidate);
                    self.pc.addIceCandidate(
                        new RTCIceCandidate({
                            candidate: iceCandidate,
                            sdpMLineIndex: mline,
                            sdpMid: mid
                        }), function () {
                            // well, this success callback is pretty meaningless
                        },
                        function (err) {
                            self.emit('error', err);
                        }
                    );
                    self._checkRemoteCandidate(iceCandidate);
                });
                cb();
            };

            if (self.iceCredentials.remote[content.name] && transport.ufrag &&
                self.iceCredentials.remote[content.name].ufrag !== transport.ufrag) {
                if (remoteContent) {
                    remoteContent.transport.ufrag = transport.ufrag;
                    remoteContent.transport.pwd = transport.pwd;
                    var offer = {
                        type: 'offer',
                        jingle: self.remoteDescription
                    };
                    offer.sdp = SJJ.toSessionSDP(offer.jingle, {
                        sid: self.config.sdpSessionID,
                        role: self._role(),
                        direction: 'incoming'
                    });
                    self.pc.setRemoteDescription(new RTCSessionDescription(offer),
                        function () {
                            processCandidates();
                        },
                        function (err) {
                            self.emit('error', err);
                        }
                    );
                } else {
                    self.emit('error', 'ice restart failed to find matching content');
                }
            } else {
                processCandidates();
            }
        });
    } else {
        // working around https://code.google.com/p/webrtc/issues/detail?id=3669
        if (update.candidate && update.candidate.candidate.indexOf('a=') !== 0) {
            update.candidate.candidate = 'a=' + update.candidate.candidate;
        }

        if (this.wtFirefox && this.firefoxcandidatebuffer !== null) {
            // we cant add this yet due to https://bugzilla.mozilla.org/show_bug.cgi?id=1087551
            if (this.pc.localDescription && this.pc.localDescription.type === 'offer') {
                this.firefoxcandidatebuffer.push(update.candidate);
                return cb();
            }
        }

        self.pc.addIceCandidate(
            new RTCIceCandidate(update.candidate),
            function () { },
            function (err) {
                self.emit('error', err);
            }
        );
        self._checkRemoteCandidate(update.candidate.candidate);
        cb();
    }
};

// Generate and emit an offer with the given constraints
PeerConnection.prototype.offer = function (constraints, cb) {
    var self = this;
    var hasConstraints = arguments.length === 2;
    var mediaConstraints = hasConstraints && constraints ? constraints : {
            offerToReceiveAudio: 1,
            offerToReceiveVideo: 1
        };
    cb = hasConstraints ? cb : constraints;
    cb = cb || function () {};

    if (this.pc.signalingState === 'closed') return cb('Already closed');

    // Actually generate the offer
    this.pc.createOffer(
        function (offer) {
            // does not work for jingle, but jingle.js doesn't need
            // this hack...
            var expandedOffer = {
                type: 'offer',
                sdp: offer.sdp
            };
            if (self.assumeSetLocalSuccess) {
                self.emit('offer', expandedOffer);
                cb(null, expandedOffer);
            }
            self._candidateBuffer = [];
            self.pc.setLocalDescription(offer,
                function () {
                    var jingle;
                    if (self.config.useJingle) {
                        jingle = SJJ.toSessionJSON(offer.sdp, {
                            role: self._role(),
                            direction: 'outgoing'
                        });
                        jingle.sid = self.config.sid;
                        self.localDescription = jingle;

                        // Save ICE credentials
                        jingle.contents.forEach(function (content) {
                            var transport = content.transport || {};
                            if (transport.ufrag) {
                                self.iceCredentials.local[content.name] = {
                                    ufrag: transport.ufrag,
                                    pwd: transport.pwd
                                };
                            }
                        });

                        expandedOffer.jingle = jingle;
                    }
                    expandedOffer.sdp.split('\r\n').forEach(function (line) {
                        if (line.indexOf('a=candidate:') === 0) {
                            self._checkLocalCandidate(line);
                        }
                    });

                    if (!self.assumeSetLocalSuccess) {
                        self.emit('offer', expandedOffer);
                        cb(null, expandedOffer);
                    }
                },
                function (err) {
                    self.emit('error', err);
                    cb(err);
                }
            );
        },
        function (err) {
            self.emit('error', err);
            cb(err);
        },
        mediaConstraints
    );
};


// Process an incoming offer so that ICE may proceed before deciding
// to answer the request.
PeerConnection.prototype.handleOffer = function (offer, cb) {
    cb = cb || function () {};
    var self = this;
    offer.type = 'offer';
    if (offer.jingle) {
        if (this.enableChromeNativeSimulcast) {
            offer.jingle.contents.forEach(function (content) {
                if (content.name === 'video') {
                    content.application.googConferenceFlag = true;
                }

            });
        }
        if (this.enableMultiStreamHacks) {
            // add a mixed video stream as first stream
            offer.jingle.contents.forEach(function (content) {
                if (content.name === 'video') {
                    var sources = content.application.sources || [];
                    if (sources.length === 0 || sources[0].ssrc !== "3735928559") {
                        sources.unshift({
                            ssrc: "3735928559", // 0xdeadbeef
                            parameters: [
                                {
                                    key: "cname",
                                    value: "deadbeef"
                                },
                                {
                                    key: "msid",
                                    value: "mixyourfecintothis please"
                                }
                            ]
                        });
                        content.application.sources = sources;
                    }
                }
            });
        }
        if (self.restrictBandwidth > 0) {
            if (offer.jingle.contents.length >= 2 && offer.jingle.contents[1].name === 'video') {
                var content = offer.jingle.contents[1];
                var hasBw = content.application && content.application.bandwidth && content.application.bandwidth.bandwidth;
                if (!hasBw) {
                    offer.jingle.contents[1].application.bandwidth = { type: 'AS', bandwidth: self.restrictBandwidth.toString() };
                    offer.sdp = SJJ.toSessionSDP(offer.jingle, {
                        sid: self.config.sdpSessionID,
                        role: self._role(),
                        direction: 'outgoing'
                    });
                }
            }
        }
        // Save ICE credentials
        offer.jingle.contents.forEach(function (content) {
            var transport = content.transport || {};
            if (transport.ufrag) {
                self.iceCredentials.remote[content.name] = {
                    ufrag: transport.ufrag,
                    pwd: transport.pwd
                };
            }
        });
        offer.sdp = SJJ.toSessionSDP(offer.jingle, {
            sid: self.config.sdpSessionID,
            role: self._role(),
            direction: 'incoming'
        });
        self.remoteDescription = offer.jingle;
    }
    offer.sdp.split('\r\n').forEach(function (line) {
        if (line.indexOf('a=candidate:') === 0) {
            self._checkRemoteCandidate(line);
        }
    });
    self.pc.setRemoteDescription(new RTCSessionDescription(offer),
        function () {
            cb();
        },
        cb
    );
};

// Answer an offer with audio only
PeerConnection.prototype.answerAudioOnly = function (cb) {
    var mediaConstraints = {
            mandatory: {
                OfferToReceiveAudio: true,
                OfferToReceiveVideo: false
            }
        };
    this._answer(mediaConstraints, cb);
};

// Answer an offer without offering to recieve
PeerConnection.prototype.answerBroadcastOnly = function (cb) {
    var mediaConstraints = {
            mandatory: {
                OfferToReceiveAudio: false,
                OfferToReceiveVideo: false
            }
        };
    this._answer(mediaConstraints, cb);
};

// Answer an offer with given constraints default is audio/video
PeerConnection.prototype.answer = function (constraints, cb) {
    var hasConstraints = arguments.length === 2;
    var callback = hasConstraints ? cb : constraints;
    var mediaConstraints = hasConstraints && constraints ? constraints : {
            mandatory: {
                OfferToReceiveAudio: true,
                OfferToReceiveVideo: true
            }
        };

    this._answer(mediaConstraints, callback);
};

// Process an answer
PeerConnection.prototype.handleAnswer = function (answer, cb) {
    cb = cb || function () {};
    var self = this;
    if (answer.jingle) {
        answer.sdp = SJJ.toSessionSDP(answer.jingle, {
            sid: self.config.sdpSessionID,
            role: self._role(),
            direction: 'incoming'
        });
        self.remoteDescription = answer.jingle;

        // Save ICE credentials
        answer.jingle.contents.forEach(function (content) {
            var transport = content.transport || {};
            if (transport.ufrag) {
                self.iceCredentials.remote[content.name] = {
                    ufrag: transport.ufrag,
                    pwd: transport.pwd
                };
            }
        });
    }
    answer.sdp.split('\r\n').forEach(function (line) {
        if (line.indexOf('a=candidate:') === 0) {
            self._checkRemoteCandidate(line);
        }
    });
    self.pc.setRemoteDescription(
        new RTCSessionDescription(answer),
        function () {
            if (self.wtFirefox) {
                window.setTimeout(function () {
                    self.firefoxcandidatebuffer.forEach(function (candidate) {
                        // add candidates later
                        self.pc.addIceCandidate(
                            new RTCIceCandidate(candidate),
                            function () { },
                            function (err) {
                                self.emit('error', err);
                            }
                        );
                        self._checkRemoteCandidate(candidate.candidate);
                    });
                    self.firefoxcandidatebuffer = null;
                }, self.wtFirefox);
            }
            cb(null);
        },
        cb
    );
};

// Close the peer connection
PeerConnection.prototype.close = function () {
    this.pc.close();

    this._localDataChannels = [];
    this._remoteDataChannels = [];

    this.emit('close');
};

// Internal code sharing for various types of answer methods
PeerConnection.prototype._answer = function (constraints, cb) {
    cb = cb || function () {};
    var self = this;
    if (!this.pc.remoteDescription) {
        // the old API is used, call handleOffer
        throw new Error('remoteDescription not set');
    }

    if (this.pc.signalingState === 'closed') return cb('Already closed');

    self.pc.createAnswer(
        function (answer) {
            var sim = [];
            if (self.enableChromeNativeSimulcast) {
                // native simulcast part 1: add another SSRC
                answer.jingle = SJJ.toSessionJSON(answer.sdp, {
                    role: self._role(),
                    direction: 'outgoing'
                });
                if (answer.jingle.contents.length >= 2 && answer.jingle.contents[1].name === 'video') {
                    var groups = answer.jingle.contents[1].application.sourceGroups || [];
                    var hasSim = false;
                    groups.forEach(function (group) {
                        if (group.semantics == 'SIM') hasSim = true;
                    });
                    if (!hasSim &&
                        answer.jingle.contents[1].application.sources.length) {
                        var newssrc = JSON.parse(JSON.stringify(answer.jingle.contents[1].application.sources[0]));
                        newssrc.ssrc = '' + Math.floor(Math.random() * 0xffffffff); // FIXME: look for conflicts
                        answer.jingle.contents[1].application.sources.push(newssrc);

                        sim.push(answer.jingle.contents[1].application.sources[0].ssrc);
                        sim.push(newssrc.ssrc);
                        groups.push({
                            semantics: 'SIM',
                            sources: sim
                        });

                        // also create an RTX one for the SIM one
                        var rtxssrc = JSON.parse(JSON.stringify(newssrc));
                        rtxssrc.ssrc = '' + Math.floor(Math.random() * 0xffffffff); // FIXME: look for conflicts
                        answer.jingle.contents[1].application.sources.push(rtxssrc);
                        groups.push({
                            semantics: 'FID',
                            sources: [newssrc.ssrc, rtxssrc.ssrc]
                        });

                        answer.jingle.contents[1].application.sourceGroups = groups;
                        answer.sdp = SJJ.toSessionSDP(answer.jingle, {
                            sid: self.config.sdpSessionID,
                            role: self._role(),
                            direction: 'outgoing'
                        });
                    }
                }
            }
            var expandedAnswer = {
                type: 'answer',
                sdp: answer.sdp
            };
            if (self.assumeSetLocalSuccess) {
                // not safe to do when doing simulcast mangling
                var copy = cloneDeep(expandedAnswer);
                self.emit('answer', copy);
                cb(null, copy);
            }
            self._candidateBuffer = [];
            self.pc.setLocalDescription(answer,
                function () {
                    if (self.config.useJingle) {
                        var jingle = SJJ.toSessionJSON(answer.sdp, {
                            role: self._role(),
                            direction: 'outgoing'
                        });
                        jingle.sid = self.config.sid;
                        self.localDescription = jingle;
                        expandedAnswer.jingle = jingle;
                    }
                    if (self.enableChromeNativeSimulcast) {
                        // native simulcast part 2:
                        // signal multiple tracks to the receiver
                        // for anything in the SIM group
                        if (!expandedAnswer.jingle) {
                            expandedAnswer.jingle = SJJ.toSessionJSON(answer.sdp, {
                                role: self._role(),
                                direction: 'outgoing'
                            });
                        }
                        expandedAnswer.jingle.contents[1].application.sources.forEach(function (source, idx) {
                            // the floor idx/2 is a hack that relies on a particular order
                            // of groups, alternating between sim and rtx
                            source.parameters = source.parameters.map(function (parameter) {
                                if (parameter.key === 'msid') {
                                    parameter.value += '-' + Math.floor(idx / 2);
                                }
                                return parameter;
                            });
                        });
                        expandedAnswer.sdp = SJJ.toSessionSDP(expandedAnswer.jingle, {
                            sid: self.sdpSessionID,
                            role: self._role(),
                            direction: 'outgoing'
                        });
                    }
                    expandedAnswer.sdp.split('\r\n').forEach(function (line) {
                        if (line.indexOf('a=candidate:') === 0) {
                            self._checkLocalCandidate(line);
                        }
                    });
                    if (!self.assumeSetLocalSuccess) {
                        var copy = cloneDeep(expandedAnswer);
                        self.emit('answer', copy);
                        cb(null, copy);
                    }
                },
                function (err) {
                    self.emit('error', err);
                    cb(err);
                }
            );
        },
        function (err) {
            self.emit('error', err);
            cb(err);
        },
        constraints
    );
};

// Internal method for emitting ice candidates on our peer object
PeerConnection.prototype._onIce = function (event) {
    var self = this;
    if (event.candidate) {
        if (this.dontSignalCandidates) return;
        var ice = event.candidate;

        var expandedCandidate = {
            candidate: {
                candidate: ice.candidate,
                sdpMid: ice.sdpMid,
                sdpMLineIndex: ice.sdpMLineIndex
            }
        };
        this._checkLocalCandidate(ice.candidate);

        var cand = SJJ.toCandidateJSON(ice.candidate);

        var already;
        var idx;
        if (this.eliminateDuplicateCandidates && cand.type === 'relay') {
            // drop candidates with same foundation, component
            // take local type pref into account so we don't ignore udp
            // ones when we know about a TCP one. unlikely but...
            already = this._candidateBuffer.filter(
                function (c) {
                    return c.type === 'relay';
                }).map(function (c) {
                    return c.foundation + ':' + c.component;
                }
            );
            idx = already.indexOf(cand.foundation + ':' + cand.component);
            // remember: local type pref of udp is 0, tcp 1, tls 2
            if (idx > -1 && ((cand.priority >> 24) >= (already[idx].priority >> 24))) {
                // drop it, same foundation with higher (worse) type pref
                return;
            }
        }
        if (this.config.bundlePolicy === 'max-bundle') {
            // drop candidates which are duplicate for audio/video/data
            // duplicate means same host/port but different sdpMid
            already = this._candidateBuffer.filter(
                function (c) {
                    return cand.type === c.type;
                }).map(function (cand) {
                    return cand.address + ':' + cand.port;
                }
            );
            idx = already.indexOf(cand.address + ':' + cand.port);
            if (idx > -1) return;
        }
        // also drop rtcp candidates since we know the peer supports RTCP-MUX
        // this is a workaround until browsers implement this natively
        if (this.config.rtcpMuxPolicy === 'require' && cand.component === '2') {
            return;
        }
        this._candidateBuffer.push(cand);

        if (self.config.useJingle) {
            if (!ice.sdpMid) { // firefox doesn't set this
                if (self.pc.remoteDescription && self.pc.remoteDescription.type === 'offer') {
                    // preserve name from remote
                    ice.sdpMid = self.remoteDescription.contents[ice.sdpMLineIndex].name;
                } else {
                    ice.sdpMid = self.localDescription.contents[ice.sdpMLineIndex].name;
                }
            }
            if (!self.iceCredentials.local[ice.sdpMid]) {
                var jingle = SJJ.toSessionJSON(self.pc.localDescription.sdp, {
                    role: self._role(),
                    direction: 'outgoing'
                });
                jingle.contents.forEach(function (content) {
                    var transport = content.transport || {};
                    if (transport.ufrag) {
                        self.iceCredentials.local[content.name] = {
                            ufrag: transport.ufrag,
                            pwd: transport.pwd
                        };
                    }
                });
            }
            expandedCandidate.jingle = {
                contents: [{
                    name: ice.sdpMid,
                    creator: self._role(),
                    transport: {
                        transportType: 'iceUdp',
                        ufrag: self.iceCredentials.local[ice.sdpMid].ufrag,
                        pwd: self.iceCredentials.local[ice.sdpMid].pwd,
                        candidates: [
                            cand
                        ]
                    }
                }]
            };
            if (self.batchIceCandidates > 0) {
                if (self.batchedIceCandidates.length === 0) {
                    window.setTimeout(function () {
                        var contents = {};
                        self.batchedIceCandidates.forEach(function (content) {
                            content = content.contents[0];
                            if (!contents[content.name]) contents[content.name] = content;
                            contents[content.name].transport.candidates.push(content.transport.candidates[0]);
                        });
                        var newCand = {
                            jingle: {
                                contents: []
                            }
                        };
                        Object.keys(contents).forEach(function (name) {
                            newCand.jingle.contents.push(contents[name]);
                        });
                        self.batchedIceCandidates = [];
                        self.emit('ice', newCand);
                    }, self.batchIceCandidates);
                }
                self.batchedIceCandidates.push(expandedCandidate.jingle);
                return;
            }

        }
        this.emit('ice', expandedCandidate);
    } else {
        this.emit('endOfCandidates');
    }
};

// Internal method for processing a new data channel being added by the
// other peer.
PeerConnection.prototype._onDataChannel = function (event) {
    // make sure we keep a reference so this doesn't get garbage collected
    var channel = event.channel;
    this._remoteDataChannels.push(channel);

    this.emit('addChannel', channel);
};

// Create a data channel spec reference:
// http://dev.w3.org/2011/webrtc/editor/webrtc.html#idl-def-RTCDataChannelInit
PeerConnection.prototype.createDataChannel = function (name, opts) {
    var channel = this.pc.createDataChannel(name, opts);

    // make sure we keep a reference so this doesn't get garbage collected
    this._localDataChannels.push(channel);

    return channel;
};

PeerConnection.prototype.getStats = function () {
    if (typeof arguments[0] === 'function') {
        var cb = arguments[0];
        this.pc.getStats().then(function (res) {
            cb(null, res);
        }, function (err) {
            cb(err);
        });
    } else {
        return this.pc.getStats.apply(this.pc, arguments);
    }
};

module.exports = PeerConnection;

},{"lodash.clonedeep":45,"sdp-jingle-json":54,"util":73,"wildemitter":75}],54:[function(require,module,exports){
var toSDP = require('./lib/tosdp');
var toJSON = require('./lib/tojson');


// Converstion from JSON to SDP

exports.toIncomingSDPOffer = function (session) {
    return toSDP.toSessionSDP(session, {
        role: 'responder',
        direction: 'incoming'
    });
};
exports.toOutgoingSDPOffer = function (session) {
    return toSDP.toSessionSDP(session, {
        role: 'initiator',
        direction: 'outgoing'
    });
};
exports.toIncomingSDPAnswer = function (session) {
    return toSDP.toSessionSDP(session, {
        role: 'initiator',
        direction: 'incoming'
    });
};
exports.toOutgoingSDPAnswer = function (session) {
    return toSDP.toSessionSDP(session, {
        role: 'responder',
        direction: 'outgoing'
    });
};
exports.toIncomingMediaSDPOffer = function (media) {
    return toSDP.toMediaSDP(media, {
        role: 'responder',
        direction: 'incoming'
    });
};
exports.toOutgoingMediaSDPOffer = function (media) {
    return toSDP.toMediaSDP(media, {
        role: 'initiator',
        direction: 'outgoing'
    });
};
exports.toIncomingMediaSDPAnswer = function (media) {
    return toSDP.toMediaSDP(media, {
        role: 'initiator',
        direction: 'incoming'
    });
};
exports.toOutgoingMediaSDPAnswer = function (media) {
    return toSDP.toMediaSDP(media, {
        role: 'responder',
        direction: 'outgoing'
    });
};
exports.toCandidateSDP = toSDP.toCandidateSDP;
exports.toMediaSDP = toSDP.toMediaSDP;
exports.toSessionSDP = toSDP.toSessionSDP;


// Conversion from SDP to JSON

exports.toIncomingJSONOffer = function (sdp, creators) {
    return toJSON.toSessionJSON(sdp, {
        role: 'responder',
        direction: 'incoming',
        creators: creators
    });
};
exports.toOutgoingJSONOffer = function (sdp, creators) {
    return toJSON.toSessionJSON(sdp, {
        role: 'initiator',
        direction: 'outgoing',
        creators: creators
    });
};
exports.toIncomingJSONAnswer = function (sdp, creators) {
    return toJSON.toSessionJSON(sdp, {
        role: 'initiator',
        direction: 'incoming',
        creators: creators
    });
};
exports.toOutgoingJSONAnswer = function (sdp, creators) {
    return toJSON.toSessionJSON(sdp, {
        role: 'responder',
        direction: 'outgoing',
        creators: creators
    });
};
exports.toIncomingMediaJSONOffer = function (sdp, creator) {
    return toJSON.toMediaJSON(sdp, {
        role: 'responder',
        direction: 'incoming',
        creator: creator
    });
};
exports.toOutgoingMediaJSONOffer = function (sdp, creator) {
    return toJSON.toMediaJSON(sdp, {
        role: 'initiator',
        direction: 'outgoing',
        creator: creator
    });
};
exports.toIncomingMediaJSONAnswer = function (sdp, creator) {
    return toJSON.toMediaJSON(sdp, {
        role: 'initiator',
        direction: 'incoming',
        creator: creator
    });
};
exports.toOutgoingMediaJSONAnswer = function (sdp, creator) {
    return toJSON.toMediaJSON(sdp, {
        role: 'responder',
        direction: 'outgoing',
        creator: creator
    });
};
exports.toCandidateJSON = toJSON.toCandidateJSON;
exports.toMediaJSON = toJSON.toMediaJSON;
exports.toSessionJSON = toJSON.toSessionJSON;

},{"./lib/tojson":57,"./lib/tosdp":58}],55:[function(require,module,exports){
exports.lines = function (sdp) {
    return sdp.split('\r\n').filter(function (line) {
        return line.length > 0;
    });
};

exports.findLine = function (prefix, mediaLines, sessionLines) {
    var prefixLength = prefix.length;
    for (var i = 0; i < mediaLines.length; i++) {
        if (mediaLines[i].substr(0, prefixLength) === prefix) {
            return mediaLines[i];
        }
    }
    // Continue searching in parent session section
    if (!sessionLines) {
        return false;
    }

    for (var j = 0; j < sessionLines.length; j++) {
        if (sessionLines[j].substr(0, prefixLength) === prefix) {
            return sessionLines[j];
        }
    }

    return false;
};

exports.findLines = function (prefix, mediaLines, sessionLines) {
    var results = [];
    var prefixLength = prefix.length;
    for (var i = 0; i < mediaLines.length; i++) {
        if (mediaLines[i].substr(0, prefixLength) === prefix) {
            results.push(mediaLines[i]);
        }
    }
    if (results.length || !sessionLines) {
        return results;
    }
    for (var j = 0; j < sessionLines.length; j++) {
        if (sessionLines[j].substr(0, prefixLength) === prefix) {
            results.push(sessionLines[j]);
        }
    }
    return results;
};

exports.mline = function (line) {
    var parts = line.substr(2).split(' ');
    var parsed = {
        media: parts[0],
        port: parts[1],
        proto: parts[2],
        formats: []
    };
    for (var i = 3; i < parts.length; i++) {
        if (parts[i]) {
            parsed.formats.push(parts[i]);
        }
    }
    return parsed;
};

exports.rtpmap = function (line) {
    var parts = line.substr(9).split(' ');
    var parsed = {
        id: parts.shift()
    };

    parts = parts[0].split('/');

    parsed.name = parts[0];
    parsed.clockrate = parts[1];
    parsed.channels = parts.length == 3 ? parts[2] : '1';
    return parsed;
};

exports.sctpmap = function (line) {
    // based on -05 draft
    var parts = line.substr(10).split(' ');
    var parsed = {
        number: parts.shift(),
        protocol: parts.shift(),
        streams: parts.shift()
    };
    return parsed;
};


exports.fmtp = function (line) {
    var kv, key, value;
    var parts = line.substr(line.indexOf(' ') + 1).split(';');
    var parsed = [];
    for (var i = 0; i < parts.length; i++) {
        kv = parts[i].split('=');
        key = kv[0].trim();
        value = kv[1];
        if (key && value) {
            parsed.push({key: key, value: value});
        } else if (key) {
            parsed.push({key: '', value: key});
        }
    }
    return parsed;
};

exports.crypto = function (line) {
    var parts = line.substr(9).split(' ');
    var parsed = {
        tag: parts[0],
        cipherSuite: parts[1],
        keyParams: parts[2],
        sessionParams: parts.slice(3).join(' ')
    };
    return parsed;
};

exports.fingerprint = function (line) {
    var parts = line.substr(14).split(' ');
    return {
        hash: parts[0],
        value: parts[1]
    };
};

exports.extmap = function (line) {
    var parts = line.substr(9).split(' ');
    var parsed = {};

    var idpart = parts.shift();
    var sp = idpart.indexOf('/');
    if (sp >= 0) {
        parsed.id = idpart.substr(0, sp);
        parsed.senders = idpart.substr(sp + 1);
    } else {
        parsed.id = idpart;
        parsed.senders = 'sendrecv';
    }

    parsed.uri = parts.shift() || '';

    return parsed;
};

exports.rtcpfb = function (line) {
    var parts = line.substr(10).split(' ');
    var parsed = {};
    parsed.id = parts.shift();
    parsed.type = parts.shift();
    if (parsed.type === 'trr-int') {
        parsed.value = parts.shift();
    } else {
        parsed.subtype = parts.shift() || '';
    }
    parsed.parameters = parts;
    return parsed;
};

exports.candidate = function (line) {
    var parts;
    if (line.indexOf('a=candidate:') === 0) {
        parts = line.substring(12).split(' ');
    } else { // no a=candidate
        parts = line.substring(10).split(' ');
    }

    var candidate = {
        foundation: parts[0],
        component: parts[1],
        protocol: parts[2].toLowerCase(),
        priority: parts[3],
        ip: parts[4],
        port: parts[5],
        // skip parts[6] == 'typ'
        type: parts[7],
        generation: '0'
    };

    for (var i = 8; i < parts.length; i += 2) {
        if (parts[i] === 'raddr') {
            candidate.relAddr = parts[i + 1];
        } else if (parts[i] === 'rport') {
            candidate.relPort = parts[i + 1];
        } else if (parts[i] === 'generation') {
            candidate.generation = parts[i + 1];
        } else if (parts[i] === 'tcptype') {
            candidate.tcpType = parts[i + 1];
        }
    }

    candidate.network = '1';

    return candidate;
};

exports.sourceGroups = function (lines) {
    var parsed = [];
    for (var i = 0; i < lines.length; i++) {
        var parts = lines[i].substr(13).split(' ');
        parsed.push({
            semantics: parts.shift(),
            sources: parts
        });
    }
    return parsed;
};

exports.sources = function (lines) {
    // http://tools.ietf.org/html/rfc5576
    var parsed = [];
    var sources = {};
    for (var i = 0; i < lines.length; i++) {
        var parts = lines[i].substr(7).split(' ');
        var ssrc = parts.shift();

        if (!sources[ssrc]) {
            var source = {
                ssrc: ssrc,
                parameters: []
            };
            parsed.push(source);

            // Keep an index
            sources[ssrc] = source;
        }

        parts = parts.join(' ').split(':');
        var attribute = parts.shift();
        var value = parts.join(':') || null;

        sources[ssrc].parameters.push({
            key: attribute,
            value: value
        });
    }

    return parsed;
};

exports.groups = function (lines) {
    // http://tools.ietf.org/html/rfc5888
    var parsed = [];
    var parts;
    for (var i = 0; i < lines.length; i++) {
        parts = lines[i].substr(8).split(' ');
        parsed.push({
            semantics: parts.shift(),
            contents: parts
        });
    }
    return parsed;
};

exports.bandwidth = function (line) {
    var parts = line.substr(2).split(':');
    var parsed = {};
    parsed.type = parts.shift();
    parsed.bandwidth = parts.shift();
    return parsed;
};

exports.msid = function (line) {
    var data = line.substr(7);
    var parts = data.split(' ');
    return {
        msid: data,
        mslabel: parts[0],
        label: parts[1]
    };
};

},{}],56:[function(require,module,exports){
module.exports = {
    initiator: {
        incoming: {
            initiator: 'recvonly',
            responder: 'sendonly',
            both: 'sendrecv',
            none: 'inactive',
            recvonly: 'initiator',
            sendonly: 'responder',
            sendrecv: 'both',
            inactive: 'none'
        },
        outgoing: {
            initiator: 'sendonly',
            responder: 'recvonly',
            both: 'sendrecv',
            none: 'inactive',
            recvonly: 'responder',
            sendonly: 'initiator',
            sendrecv: 'both',
            inactive: 'none'
        }
    },
    responder: {
        incoming: {
            initiator: 'sendonly',
            responder: 'recvonly',
            both: 'sendrecv',
            none: 'inactive',
            recvonly: 'responder',
            sendonly: 'initiator',
            sendrecv: 'both',
            inactive: 'none'
        },
        outgoing: {
            initiator: 'recvonly',
            responder: 'sendonly',
            both: 'sendrecv',
            none: 'inactive',
            recvonly: 'initiator',
            sendonly: 'responder',
            sendrecv: 'both',
            inactive: 'none'
        }
    }
};

},{}],57:[function(require,module,exports){
var SENDERS = require('./senders');
var parsers = require('./parsers');
var idCounter = Math.random();


exports._setIdCounter = function (counter) {
    idCounter = counter;
};

exports.toSessionJSON = function (sdp, opts) {
    var i;
    var creators = opts.creators || [];
    var role = opts.role || 'initiator';
    var direction = opts.direction || 'outgoing';


    // Divide the SDP into session and media sections.
    var media = sdp.split('\r\nm=');
    for (i = 1; i < media.length; i++) {
        media[i] = 'm=' + media[i];
        if (i !== media.length - 1) {
            media[i] += '\r\n';
        }
    }
    var session = media.shift() + '\r\n';
    var sessionLines = parsers.lines(session);
    var parsed = {};

    var contents = [];
    for (i = 0; i < media.length; i++) {
        contents.push(exports.toMediaJSON(media[i], session, {
            role: role,
            direction: direction,
            creator: creators[i] || 'initiator'
        }));
    }
    parsed.contents = contents;

    var groupLines = parsers.findLines('a=group:', sessionLines);
    if (groupLines.length) {
        parsed.groups = parsers.groups(groupLines);
    }

    return parsed;
};

exports.toMediaJSON = function (media, session, opts) {
    var creator = opts.creator || 'initiator';
    var role = opts.role || 'initiator';
    var direction = opts.direction || 'outgoing';

    var lines = parsers.lines(media);
    var sessionLines = parsers.lines(session);
    var mline = parsers.mline(lines[0]);

    var content = {
        creator: creator,
        name: mline.media,
        application: {
            applicationType: 'rtp',
            media: mline.media,
            payloads: [],
            encryption: [],
            feedback: [],
            headerExtensions: []
        },
        transport: {
            transportType: 'iceUdp',
            candidates: [],
            fingerprints: []
        }
    };
    if (mline.media == 'application') {
        // FIXME: the description is most likely to be independent
        // of the SDP and should be processed by other parts of the library
        content.application = {
            applicationType: 'datachannel'
        };
        content.transport.sctp = [];
    }
    var desc = content.application;
    var trans = content.transport;

    // If we have a mid, use that for the content name instead.
    var mid = parsers.findLine('a=mid:', lines);
    if (mid) {
        content.name = mid.substr(6);
    }

    if (parsers.findLine('a=sendrecv', lines, sessionLines)) {
        content.senders = 'both';
    } else if (parsers.findLine('a=sendonly', lines, sessionLines)) {
        content.senders = SENDERS[role][direction].sendonly;
    } else if (parsers.findLine('a=recvonly', lines, sessionLines)) {
        content.senders = SENDERS[role][direction].recvonly;
    } else if (parsers.findLine('a=inactive', lines, sessionLines)) {
        content.senders = 'none';
    }

    if (desc.applicationType == 'rtp') {
        var bandwidth = parsers.findLine('b=', lines);
        if (bandwidth) {
            desc.bandwidth = parsers.bandwidth(bandwidth);
        }

        var ssrc = parsers.findLine('a=ssrc:', lines);
        if (ssrc) {
            desc.ssrc = ssrc.substr(7).split(' ')[0];
        }

        var rtpmapLines = parsers.findLines('a=rtpmap:', lines);
        rtpmapLines.forEach(function (line) {
            var payload = parsers.rtpmap(line);
            payload.parameters = [];
            payload.feedback = [];

            var fmtpLines = parsers.findLines('a=fmtp:' + payload.id, lines);
            // There should only be one fmtp line per payload
            fmtpLines.forEach(function (line) {
                payload.parameters = parsers.fmtp(line);
            });

            var fbLines = parsers.findLines('a=rtcp-fb:' + payload.id, lines);
            fbLines.forEach(function (line) {
                payload.feedback.push(parsers.rtcpfb(line));
            });

            desc.payloads.push(payload);
        });

        var cryptoLines = parsers.findLines('a=crypto:', lines, sessionLines);
        cryptoLines.forEach(function (line) {
            desc.encryption.push(parsers.crypto(line));
        });

        if (parsers.findLine('a=rtcp-mux', lines)) {
            desc.mux = true;
        }

        var fbLines = parsers.findLines('a=rtcp-fb:*', lines);
        fbLines.forEach(function (line) {
            desc.feedback.push(parsers.rtcpfb(line));
        });

        var extLines = parsers.findLines('a=extmap:', lines);
        extLines.forEach(function (line) {
            var ext = parsers.extmap(line);

            ext.senders = SENDERS[role][direction][ext.senders];

            desc.headerExtensions.push(ext);
        });

        var ssrcGroupLines = parsers.findLines('a=ssrc-group:', lines);
        desc.sourceGroups = parsers.sourceGroups(ssrcGroupLines || []);

        var ssrcLines = parsers.findLines('a=ssrc:', lines);
        var sources = desc.sources = parsers.sources(ssrcLines || []);

        var msidLine = parsers.findLine('a=msid:', lines);
        if (msidLine) {
            var msid = parsers.msid(msidLine);
            ['msid', 'mslabel', 'label'].forEach(function (key) {
                for (var i = 0; i < sources.length; i++) {
                    var found = false;
                    for (var j = 0; j < sources[i].parameters.length; j++) {
                        if (sources[i].parameters[j].key === key) {
                            found = true;
                        }
                    }
                    if (!found) {
                        sources[i].parameters.push({ key: key, value: msid[key] });
                    }
                }
            });
        }

        if (parsers.findLine('a=x-google-flag:conference', lines, sessionLines)) {
            desc.googConferenceFlag = true;
        }
    }

    // transport specific attributes
    var fingerprintLines = parsers.findLines('a=fingerprint:', lines, sessionLines);
    var setup = parsers.findLine('a=setup:', lines, sessionLines);
    fingerprintLines.forEach(function (line) {
        var fp = parsers.fingerprint(line);
        if (setup) {
            fp.setup = setup.substr(8);
        }
        trans.fingerprints.push(fp);
    });

    var ufragLine = parsers.findLine('a=ice-ufrag:', lines, sessionLines);
    var pwdLine = parsers.findLine('a=ice-pwd:', lines, sessionLines);
    if (ufragLine && pwdLine) {
        trans.ufrag = ufragLine.substr(12);
        trans.pwd = pwdLine.substr(10);
        trans.candidates = [];

        var candidateLines = parsers.findLines('a=candidate:', lines, sessionLines);
        candidateLines.forEach(function (line) {
            trans.candidates.push(exports.toCandidateJSON(line));
        });
    }

    if (desc.applicationType == 'datachannel') {
        var sctpmapLines = parsers.findLines('a=sctpmap:', lines);
        sctpmapLines.forEach(function (line) {
            var sctp = parsers.sctpmap(line);
            trans.sctp.push(sctp);
        });
    }

    return content;
};

exports.toCandidateJSON = function (line) {
    var candidate = parsers.candidate(line.split('\r\n')[0]);
    candidate.id = (idCounter++).toString(36).substr(0, 12);
    return candidate;
};

},{"./parsers":55,"./senders":56}],58:[function(require,module,exports){
var SENDERS = require('./senders');


exports.toSessionSDP = function (session, opts) {
    var role = opts.role || 'initiator';
    var direction = opts.direction || 'outgoing';
    var sid = opts.sid || session.sid || Date.now();
    var time = opts.time || Date.now();

    var sdp = [
        'v=0',
        'o=- ' + sid + ' ' + time + ' IN IP4 0.0.0.0',
        's=-',
        't=0 0'
    ];

    var contents = session.contents || [];
    var hasSources = false;
    contents.forEach(function (content) {
        if (content.application.sources &&
            content.application.sources.length) {
            hasSources = true;
        }
    });

    if (hasSources) {
        sdp.push('a=msid-semantic: WMS *');
    }

    var groups = session.groups || [];
    groups.forEach(function (group) {
        sdp.push('a=group:' + group.semantics + ' ' + group.contents.join(' '));
    });


    contents.forEach(function (content) {
        sdp.push(exports.toMediaSDP(content, opts));
    });

    return sdp.join('\r\n') + '\r\n';
};

exports.toMediaSDP = function (content, opts) {
    var sdp = [];

    var role = opts.role || 'initiator';
    var direction = opts.direction || 'outgoing';

    var desc = content.application;
    var transport = content.transport;
    var payloads = desc.payloads || [];
    var fingerprints = (transport && transport.fingerprints) || [];

    var mline = [];
    if (desc.applicationType == 'datachannel') {
        mline.push('application');
        mline.push('1');
        mline.push('DTLS/SCTP');
        if (transport.sctp) {
            transport.sctp.forEach(function (map) {
                mline.push(map.number);
            });
        }
    } else {
        mline.push(desc.media);
        mline.push('1');
        if (fingerprints.length > 0) {
            mline.push('UDP/TLS/RTP/SAVPF');
        } else if (desc.encryption && desc.encryption.length > 0) {
            mline.push('RTP/SAVPF');
        } else {
            mline.push('RTP/AVPF');
        }
        payloads.forEach(function (payload) {
            mline.push(payload.id);
        });
    }


    sdp.push('m=' + mline.join(' '));

    sdp.push('c=IN IP4 0.0.0.0');
    if (desc.bandwidth && desc.bandwidth.type && desc.bandwidth.bandwidth) {
        sdp.push('b=' + desc.bandwidth.type + ':' + desc.bandwidth.bandwidth);
    }
    if (desc.applicationType == 'rtp') {
        sdp.push('a=rtcp:1 IN IP4 0.0.0.0');
    }

    if (transport) {
        if (transport.ufrag) {
            sdp.push('a=ice-ufrag:' + transport.ufrag);
        }
        if (transport.pwd) {
            sdp.push('a=ice-pwd:' + transport.pwd);
        }

        var pushedSetup = false;
        fingerprints.forEach(function (fingerprint) {
            sdp.push('a=fingerprint:' + fingerprint.hash + ' ' + fingerprint.value);
            if (fingerprint.setup && !pushedSetup) {
                sdp.push('a=setup:' + fingerprint.setup);
            }
        });

        if (transport.sctp) {
            transport.sctp.forEach(function (map) {
                sdp.push('a=sctpmap:' + map.number + ' ' + map.protocol + ' ' + map.streams);
            });
        }
    }

    if (desc.applicationType == 'rtp') {
        sdp.push('a=' + (SENDERS[role][direction][content.senders] || 'sendrecv'));
    }
    sdp.push('a=mid:' + content.name);

    if (desc.sources && desc.sources.length) {
        (desc.sources[0].parameters || []).forEach(function (param) {
            if (param.key === 'msid') {
                sdp.push('a=msid:' + param.value);
            }
        });
    }

    if (desc.mux) {
        sdp.push('a=rtcp-mux');
    }

    var encryption = desc.encryption || [];
    encryption.forEach(function (crypto) {
        sdp.push('a=crypto:' + crypto.tag + ' ' + crypto.cipherSuite + ' ' + crypto.keyParams + (crypto.sessionParams ? ' ' + crypto.sessionParams : ''));
    });
    if (desc.googConferenceFlag) {
        sdp.push('a=x-google-flag:conference');
    }

    payloads.forEach(function (payload) {
        var rtpmap = 'a=rtpmap:' + payload.id + ' ' + payload.name + '/' + payload.clockrate;
        if (payload.channels && payload.channels != '1') {
            rtpmap += '/' + payload.channels;
        }
        sdp.push(rtpmap);

        if (payload.parameters && payload.parameters.length) {
            var fmtp = ['a=fmtp:' + payload.id];
            var parameters = [];
            payload.parameters.forEach(function (param) {
                parameters.push((param.key ? param.key + '=' : '') + param.value);
            });
            fmtp.push(parameters.join(';'));
            sdp.push(fmtp.join(' '));
        }

        if (payload.feedback) {
            payload.feedback.forEach(function (fb) {
                if (fb.type === 'trr-int') {
                    sdp.push('a=rtcp-fb:' + payload.id + ' trr-int ' + (fb.value ? fb.value : '0'));
                } else {
                    sdp.push('a=rtcp-fb:' + payload.id + ' ' + fb.type + (fb.subtype ? ' ' + fb.subtype : ''));
                }
            });
        }
    });

    if (desc.feedback) {
        desc.feedback.forEach(function (fb) {
            if (fb.type === 'trr-int') {
                sdp.push('a=rtcp-fb:* trr-int ' + (fb.value ? fb.value : '0'));
            } else {
                sdp.push('a=rtcp-fb:* ' + fb.type + (fb.subtype ? ' ' + fb.subtype : ''));
            }
        });
    }

    var hdrExts = desc.headerExtensions || [];
    hdrExts.forEach(function (hdr) {
        sdp.push('a=extmap:' + hdr.id + (hdr.senders ? '/' + SENDERS[role][direction][hdr.senders] : '') + ' ' + hdr.uri);
    });

    var ssrcGroups = desc.sourceGroups || [];
    ssrcGroups.forEach(function (ssrcGroup) {
        sdp.push('a=ssrc-group:' + ssrcGroup.semantics + ' ' + ssrcGroup.sources.join(' '));
    });

    var ssrcs = desc.sources || [];
    ssrcs.forEach(function (ssrc) {
        for (var i = 0; i < ssrc.parameters.length; i++) {
            var param = ssrc.parameters[i];
            sdp.push('a=ssrc:' + (ssrc.ssrc || desc.ssrc) + ' ' + param.key + (param.value ? (':' + param.value) : ''));
        }
    });

    var candidates = transport.candidates || [];
    candidates.forEach(function (candidate) {
        sdp.push(exports.toCandidateSDP(candidate));
    });

    return sdp.join('\r\n');
};

exports.toCandidateSDP = function (candidate) {
    var sdp = [];

    sdp.push(candidate.foundation);
    sdp.push(candidate.component);
    sdp.push(candidate.protocol.toUpperCase());
    sdp.push(candidate.priority);
    sdp.push(candidate.ip);
    sdp.push(candidate.port);

    var type = candidate.type;
    sdp.push('typ');
    sdp.push(type);
    if (type === 'srflx' || type === 'prflx' || type === 'relay') {
        if (candidate.relAddr && candidate.relPort) {
            sdp.push('raddr');
            sdp.push(candidate.relAddr);
            sdp.push('rport');
            sdp.push(candidate.relPort);
        }
    }
    if (candidate.tcpType && candidate.protocol.toUpperCase() == 'TCP') {
        sdp.push('tcptype');
        sdp.push(candidate.tcpType);
    }

    sdp.push('generation');
    sdp.push(candidate.generation || '0');

    // FIXME: apparently this is wrong per spec
    // but then, we need this when actually putting this into
    // SDP so it's going to stay.
    // decision needs to be revisited when browsers dont
    // accept this any longer
    return 'a=candidate:' + sdp.join(' ');
};

},{"./senders":56}],59:[function(require,module,exports){
 /* eslint-env node */
'use strict';

// SDP helpers.
var SDPUtils = {};

// Generate an alphanumeric identifier for cname or mids.
// TODO: use UUIDs instead? https://gist.github.com/jed/982883
SDPUtils.generateIdentifier = function() {
  return Math.random().toString(36).substr(2, 10);
};

// The RTCP CNAME used by all peerconnections from the same JS.
SDPUtils.localCName = SDPUtils.generateIdentifier();

// Splits SDP into lines, dealing with both CRLF and LF.
SDPUtils.splitLines = function(blob) {
  return blob.trim().split('\n').map(function(line) {
    return line.trim();
  });
};
// Splits SDP into sessionpart and mediasections. Ensures CRLF.
SDPUtils.splitSections = function(blob) {
  var parts = blob.split('\nm=');
  return parts.map(function(part, index) {
    return (index > 0 ? 'm=' + part : part).trim() + '\r\n';
  });
};

// Returns lines that start with a certain prefix.
SDPUtils.matchPrefix = function(blob, prefix) {
  return SDPUtils.splitLines(blob).filter(function(line) {
    return line.indexOf(prefix) === 0;
  });
};

// Parses an ICE candidate line. Sample input:
// candidate:702786350 2 udp 41819902 8.8.8.8 60769 typ relay raddr 8.8.8.8
// rport 55996"
SDPUtils.parseCandidate = function(line) {
  var parts;
  // Parse both variants.
  if (line.indexOf('a=candidate:') === 0) {
    parts = line.substring(12).split(' ');
  } else {
    parts = line.substring(10).split(' ');
  }

  var candidate = {
    foundation: parts[0],
    component: parts[1],
    protocol: parts[2].toLowerCase(),
    priority: parseInt(parts[3], 10),
    ip: parts[4],
    port: parseInt(parts[5], 10),
    // skip parts[6] == 'typ'
    type: parts[7]
  };

  for (var i = 8; i < parts.length; i += 2) {
    switch (parts[i]) {
      case 'raddr':
        candidate.relatedAddress = parts[i + 1];
        break;
      case 'rport':
        candidate.relatedPort = parseInt(parts[i + 1], 10);
        break;
      case 'tcptype':
        candidate.tcpType = parts[i + 1];
        break;
      default: // extension handling, in particular ufrag
        candidate[parts[i]] = parts[i + 1];
        break;
    }
  }
  return candidate;
};

// Translates a candidate object into SDP candidate attribute.
SDPUtils.writeCandidate = function(candidate) {
  var sdp = [];
  sdp.push(candidate.foundation);
  sdp.push(candidate.component);
  sdp.push(candidate.protocol.toUpperCase());
  sdp.push(candidate.priority);
  sdp.push(candidate.ip);
  sdp.push(candidate.port);

  var type = candidate.type;
  sdp.push('typ');
  sdp.push(type);
  if (type !== 'host' && candidate.relatedAddress &&
      candidate.relatedPort) {
    sdp.push('raddr');
    sdp.push(candidate.relatedAddress); // was: relAddr
    sdp.push('rport');
    sdp.push(candidate.relatedPort); // was: relPort
  }
  if (candidate.tcpType && candidate.protocol.toLowerCase() === 'tcp') {
    sdp.push('tcptype');
    sdp.push(candidate.tcpType);
  }
  return 'candidate:' + sdp.join(' ');
};

// Parses an ice-options line, returns an array of option tags.
// a=ice-options:foo bar
SDPUtils.parseIceOptions = function(line) {
  return line.substr(14).split(' ');
}

// Parses an rtpmap line, returns RTCRtpCoddecParameters. Sample input:
// a=rtpmap:111 opus/48000/2
SDPUtils.parseRtpMap = function(line) {
  var parts = line.substr(9).split(' ');
  var parsed = {
    payloadType: parseInt(parts.shift(), 10) // was: id
  };

  parts = parts[0].split('/');

  parsed.name = parts[0];
  parsed.clockRate = parseInt(parts[1], 10); // was: clockrate
  // was: channels
  parsed.numChannels = parts.length === 3 ? parseInt(parts[2], 10) : 1;
  return parsed;
};

// Generate an a=rtpmap line from RTCRtpCodecCapability or
// RTCRtpCodecParameters.
SDPUtils.writeRtpMap = function(codec) {
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  return 'a=rtpmap:' + pt + ' ' + codec.name + '/' + codec.clockRate +
      (codec.numChannels !== 1 ? '/' + codec.numChannels : '') + '\r\n';
};

// Parses an a=extmap line (headerextension from RFC 5285). Sample input:
// a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
// a=extmap:2/sendonly urn:ietf:params:rtp-hdrext:toffset
SDPUtils.parseExtmap = function(line) {
  var parts = line.substr(9).split(' ');
  return {
    id: parseInt(parts[0], 10),
    direction: parts[0].indexOf('/') > 0 ? parts[0].split('/')[1] : 'sendrecv',
    uri: parts[1]
  };
};

// Generates a=extmap line from RTCRtpHeaderExtensionParameters or
// RTCRtpHeaderExtension.
SDPUtils.writeExtmap = function(headerExtension) {
  return 'a=extmap:' + (headerExtension.id || headerExtension.preferredId) +
      (headerExtension.direction && headerExtension.direction !== 'sendrecv'
          ? '/' + headerExtension.direction
          : '') +
      ' ' + headerExtension.uri + '\r\n';
};

// Parses an ftmp line, returns dictionary. Sample input:
// a=fmtp:96 vbr=on;cng=on
// Also deals with vbr=on; cng=on
SDPUtils.parseFmtp = function(line) {
  var parsed = {};
  var kv;
  var parts = line.substr(line.indexOf(' ') + 1).split(';');
  for (var j = 0; j < parts.length; j++) {
    kv = parts[j].trim().split('=');
    parsed[kv[0].trim()] = kv[1];
  }
  return parsed;
};

// Generates an a=ftmp line from RTCRtpCodecCapability or RTCRtpCodecParameters.
SDPUtils.writeFmtp = function(codec) {
  var line = '';
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  if (codec.parameters && Object.keys(codec.parameters).length) {
    var params = [];
    Object.keys(codec.parameters).forEach(function(param) {
      params.push(param + '=' + codec.parameters[param]);
    });
    line += 'a=fmtp:' + pt + ' ' + params.join(';') + '\r\n';
  }
  return line;
};

// Parses an rtcp-fb line, returns RTCPRtcpFeedback object. Sample input:
// a=rtcp-fb:98 nack rpsi
SDPUtils.parseRtcpFb = function(line) {
  var parts = line.substr(line.indexOf(' ') + 1).split(' ');
  return {
    type: parts.shift(),
    parameter: parts.join(' ')
  };
};
// Generate a=rtcp-fb lines from RTCRtpCodecCapability or RTCRtpCodecParameters.
SDPUtils.writeRtcpFb = function(codec) {
  var lines = '';
  var pt = codec.payloadType;
  if (codec.preferredPayloadType !== undefined) {
    pt = codec.preferredPayloadType;
  }
  if (codec.rtcpFeedback && codec.rtcpFeedback.length) {
    // FIXME: special handling for trr-int?
    codec.rtcpFeedback.forEach(function(fb) {
      lines += 'a=rtcp-fb:' + pt + ' ' + fb.type +
      (fb.parameter && fb.parameter.length ? ' ' + fb.parameter : '') +
          '\r\n';
    });
  }
  return lines;
};

// Parses an RFC 5576 ssrc media attribute. Sample input:
// a=ssrc:3735928559 cname:something
SDPUtils.parseSsrcMedia = function(line) {
  var sp = line.indexOf(' ');
  var parts = {
    ssrc: parseInt(line.substr(7, sp - 7), 10)
  };
  var colon = line.indexOf(':', sp);
  if (colon > -1) {
    parts.attribute = line.substr(sp + 1, colon - sp - 1);
    parts.value = line.substr(colon + 1);
  } else {
    parts.attribute = line.substr(sp + 1);
  }
  return parts;
};

// Extracts the MID (RFC 5888) from a media section.
// returns the MID or undefined if no mid line was found.
SDPUtils.getMid = function(mediaSection) {
  var mid = SDPUtils.matchPrefix(mediaSection, 'a=mid:')[0];
  if (mid) {
    return mid.substr(6);
  }
}

SDPUtils.parseFingerprint = function(line) {
  var parts = line.substr(14).split(' ');
  return {
    algorithm: parts[0].toLowerCase(), // algorithm is case-sensitive in Edge.
    value: parts[1]
  };
};

// Extracts DTLS parameters from SDP media section or sessionpart.
// FIXME: for consistency with other functions this should only
//   get the fingerprint line as input. See also getIceParameters.
SDPUtils.getDtlsParameters = function(mediaSection, sessionpart) {
  var lines = SDPUtils.matchPrefix(mediaSection + sessionpart,
      'a=fingerprint:');
  // Note: a=setup line is ignored since we use the 'auto' role.
  // Note2: 'algorithm' is not case sensitive except in Edge.
  return {
    role: 'auto',
    fingerprints: lines.map(SDPUtils.parseFingerprint)
  };
};

// Serializes DTLS parameters to SDP.
SDPUtils.writeDtlsParameters = function(params, setupType) {
  var sdp = 'a=setup:' + setupType + '\r\n';
  params.fingerprints.forEach(function(fp) {
    sdp += 'a=fingerprint:' + fp.algorithm + ' ' + fp.value + '\r\n';
  });
  return sdp;
};
// Parses ICE information from SDP media section or sessionpart.
// FIXME: for consistency with other functions this should only
//   get the ice-ufrag and ice-pwd lines as input.
SDPUtils.getIceParameters = function(mediaSection, sessionpart) {
  var lines = SDPUtils.splitLines(mediaSection);
  // Search in session part, too.
  lines = lines.concat(SDPUtils.splitLines(sessionpart));
  var iceParameters = {
    usernameFragment: lines.filter(function(line) {
      return line.indexOf('a=ice-ufrag:') === 0;
    })[0].substr(12),
    password: lines.filter(function(line) {
      return line.indexOf('a=ice-pwd:') === 0;
    })[0].substr(10)
  };
  return iceParameters;
};

// Serializes ICE parameters to SDP.
SDPUtils.writeIceParameters = function(params) {
  return 'a=ice-ufrag:' + params.usernameFragment + '\r\n' +
      'a=ice-pwd:' + params.password + '\r\n';
};

// Parses the SDP media section and returns RTCRtpParameters.
SDPUtils.parseRtpParameters = function(mediaSection) {
  var description = {
    codecs: [],
    headerExtensions: [],
    fecMechanisms: [],
    rtcp: []
  };
  var lines = SDPUtils.splitLines(mediaSection);
  var mline = lines[0].split(' ');
  for (var i = 3; i < mline.length; i++) { // find all codecs from mline[3..]
    var pt = mline[i];
    var rtpmapline = SDPUtils.matchPrefix(
        mediaSection, 'a=rtpmap:' + pt + ' ')[0];
    if (rtpmapline) {
      var codec = SDPUtils.parseRtpMap(rtpmapline);
      var fmtps = SDPUtils.matchPrefix(
          mediaSection, 'a=fmtp:' + pt + ' ');
      // Only the first a=fmtp:<pt> is considered.
      codec.parameters = fmtps.length ? SDPUtils.parseFmtp(fmtps[0]) : {};
      codec.rtcpFeedback = SDPUtils.matchPrefix(
          mediaSection, 'a=rtcp-fb:' + pt + ' ')
        .map(SDPUtils.parseRtcpFb);
      description.codecs.push(codec);
      // parse FEC mechanisms from rtpmap lines.
      switch (codec.name.toUpperCase()) {
        case 'RED':
        case 'ULPFEC':
          description.fecMechanisms.push(codec.name.toUpperCase());
          break;
        default: // only RED and ULPFEC are recognized as FEC mechanisms.
          break;
      }
    }
  }
  SDPUtils.matchPrefix(mediaSection, 'a=extmap:').forEach(function(line) {
    description.headerExtensions.push(SDPUtils.parseExtmap(line));
  });
  // FIXME: parse rtcp.
  return description;
};

// Generates parts of the SDP media section describing the capabilities /
// parameters.
SDPUtils.writeRtpDescription = function(kind, caps) {
  var sdp = '';

  // Build the mline.
  sdp += 'm=' + kind + ' ';
  sdp += caps.codecs.length > 0 ? '9' : '0'; // reject if no codecs.
  sdp += ' UDP/TLS/RTP/SAVPF ';
  sdp += caps.codecs.map(function(codec) {
    if (codec.preferredPayloadType !== undefined) {
      return codec.preferredPayloadType;
    }
    return codec.payloadType;
  }).join(' ') + '\r\n';

  sdp += 'c=IN IP4 0.0.0.0\r\n';
  sdp += 'a=rtcp:9 IN IP4 0.0.0.0\r\n';

  // Add a=rtpmap lines for each codec. Also fmtp and rtcp-fb.
  caps.codecs.forEach(function(codec) {
    sdp += SDPUtils.writeRtpMap(codec);
    sdp += SDPUtils.writeFmtp(codec);
    sdp += SDPUtils.writeRtcpFb(codec);
  });
  var maxptime = 0;
  caps.codecs.forEach(function(codec) {
    if (codec.maxptime > maxptime) {
      maxptime = codec.maxptime;
    }
  });
  if (maxptime > 0) {
    sdp += 'a=maxptime:' + maxptime + '\r\n';
  }
  sdp += 'a=rtcp-mux\r\n';

  caps.headerExtensions.forEach(function(extension) {
    sdp += SDPUtils.writeExtmap(extension);
  });
  // FIXME: write fecMechanisms.
  return sdp;
};

// Parses the SDP media section and returns an array of
// RTCRtpEncodingParameters.
SDPUtils.parseRtpEncodingParameters = function(mediaSection) {
  var encodingParameters = [];
  var description = SDPUtils.parseRtpParameters(mediaSection);
  var hasRed = description.fecMechanisms.indexOf('RED') !== -1;
  var hasUlpfec = description.fecMechanisms.indexOf('ULPFEC') !== -1;

  // filter a=ssrc:... cname:, ignore PlanB-msid
  var ssrcs = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
  .map(function(line) {
    return SDPUtils.parseSsrcMedia(line);
  })
  .filter(function(parts) {
    return parts.attribute === 'cname';
  });
  var primarySsrc = ssrcs.length > 0 && ssrcs[0].ssrc;
  var secondarySsrc;

  var flows = SDPUtils.matchPrefix(mediaSection, 'a=ssrc-group:FID')
  .map(function(line) {
    var parts = line.split(' ');
    parts.shift();
    return parts.map(function(part) {
      return parseInt(part, 10);
    });
  });
  if (flows.length > 0 && flows[0].length > 1 && flows[0][0] === primarySsrc) {
    secondarySsrc = flows[0][1];
  }

  description.codecs.forEach(function(codec) {
    if (codec.name.toUpperCase() === 'RTX' && codec.parameters.apt) {
      var encParam = {
        ssrc: primarySsrc,
        codecPayloadType: parseInt(codec.parameters.apt, 10),
        rtx: {
          ssrc: secondarySsrc
        }
      };
      encodingParameters.push(encParam);
      if (hasRed) {
        encParam = JSON.parse(JSON.stringify(encParam));
        encParam.fec = {
          ssrc: secondarySsrc,
          mechanism: hasUlpfec ? 'red+ulpfec' : 'red'
        };
        encodingParameters.push(encParam);
      }
    }
  });
  if (encodingParameters.length === 0 && primarySsrc) {
    encodingParameters.push({
      ssrc: primarySsrc
    });
  }

  // we support both b=AS and b=TIAS but interpret AS as TIAS.
  var bandwidth = SDPUtils.matchPrefix(mediaSection, 'b=');
  if (bandwidth.length) {
    if (bandwidth[0].indexOf('b=TIAS:') === 0) {
      bandwidth = parseInt(bandwidth[0].substr(7), 10);
    } else if (bandwidth[0].indexOf('b=AS:') === 0) {
      bandwidth = parseInt(bandwidth[0].substr(5), 10);
    }
    encodingParameters.forEach(function(params) {
      params.maxBitrate = bandwidth;
    });
  }
  return encodingParameters;
};

// parses http://draft.ortc.org/#rtcrtcpparameters*
SDPUtils.parseRtcpParameters = function(mediaSection) {
  var rtcpParameters = {};

  var cname;
  // Gets the first SSRC. Note that with RTX there might be multiple
  // SSRCs.
  var remoteSsrc = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
      .map(function(line) {
        return SDPUtils.parseSsrcMedia(line);
      })
      .filter(function(obj) {
        return obj.attribute === 'cname';
      })[0];
  if (remoteSsrc) {
    rtcpParameters.cname = remoteSsrc.value;
    rtcpParameters.ssrc = remoteSsrc.ssrc;
  }

  // Edge uses the compound attribute instead of reducedSize
  // compound is !reducedSize
  var rsize = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-rsize');
  rtcpParameters.reducedSize = rsize.length > 0;
  rtcpParameters.compound = rsize.length === 0;

  // parses the rtcp-mux attrіbute.
  // Note that Edge does not support unmuxed RTCP.
  var mux = SDPUtils.matchPrefix(mediaSection, 'a=rtcp-mux');
  rtcpParameters.mux = mux.length > 0;

  return rtcpParameters;
};

// parses either a=msid: or a=ssrc:... msid lines and returns
// the id of the MediaStream and MediaStreamTrack.
SDPUtils.parseMsid = function(mediaSection) {
  var parts;
  var spec = SDPUtils.matchPrefix(mediaSection, 'a=msid:');
  if (spec.length === 1) {
    parts = spec[0].substr(7).split(' ');
    return {stream: parts[0], track: parts[1]};
  }
  var planB = SDPUtils.matchPrefix(mediaSection, 'a=ssrc:')
  .map(function(line) {
    return SDPUtils.parseSsrcMedia(line);
  })
  .filter(function(parts) {
    return parts.attribute === 'msid';
  });
  if (planB.length > 0) {
    parts = planB[0].value.split(' ');
    return {stream: parts[0], track: parts[1]};
  }
};

SDPUtils.writeSessionBoilerplate = function() {
  // FIXME: sess-id should be an NTP timestamp.
  return 'v=0\r\n' +
      'o=thisisadapterortc 8169639915646943137 2 IN IP4 127.0.0.1\r\n' +
      's=-\r\n' +
      't=0 0\r\n';
};

SDPUtils.writeMediaSection = function(transceiver, caps, type, stream) {
  var sdp = SDPUtils.writeRtpDescription(transceiver.kind, caps);

  // Map ICE parameters (ufrag, pwd) to SDP.
  sdp += SDPUtils.writeIceParameters(
      transceiver.iceGatherer.getLocalParameters());

  // Map DTLS parameters to SDP.
  sdp += SDPUtils.writeDtlsParameters(
      transceiver.dtlsTransport.getLocalParameters(),
      type === 'offer' ? 'actpass' : 'active');

  sdp += 'a=mid:' + transceiver.mid + '\r\n';

  if (transceiver.direction) {
    sdp += 'a=' + transceiver.direction + '\r\n';
  } else if (transceiver.rtpSender && transceiver.rtpReceiver) {
    sdp += 'a=sendrecv\r\n';
  } else if (transceiver.rtpSender) {
    sdp += 'a=sendonly\r\n';
  } else if (transceiver.rtpReceiver) {
    sdp += 'a=recvonly\r\n';
  } else {
    sdp += 'a=inactive\r\n';
  }

  if (transceiver.rtpSender) {
    // spec.
    var msid = 'msid:' + stream.id + ' ' +
        transceiver.rtpSender.track.id + '\r\n';
    sdp += 'a=' + msid;

    // for Chrome.
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
        ' ' + msid;
    if (transceiver.sendEncodingParameters[0].rtx) {
      sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
          ' ' + msid;
      sdp += 'a=ssrc-group:FID ' +
          transceiver.sendEncodingParameters[0].ssrc + ' ' +
          transceiver.sendEncodingParameters[0].rtx.ssrc +
          '\r\n';
    }
  }
  // FIXME: this should be written by writeRtpDescription.
  sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].ssrc +
      ' cname:' + SDPUtils.localCName + '\r\n';
  if (transceiver.rtpSender && transceiver.sendEncodingParameters[0].rtx) {
    sdp += 'a=ssrc:' + transceiver.sendEncodingParameters[0].rtx.ssrc +
        ' cname:' + SDPUtils.localCName + '\r\n';
  }
  return sdp;
};

// Gets the direction from the mediaSection or the sessionpart.
SDPUtils.getDirection = function(mediaSection, sessionpart) {
  // Look for sendrecv, sendonly, recvonly, inactive, default to sendrecv.
  var lines = SDPUtils.splitLines(mediaSection);
  for (var i = 0; i < lines.length; i++) {
    switch (lines[i]) {
      case 'a=sendrecv':
      case 'a=sendonly':
      case 'a=recvonly':
      case 'a=inactive':
        return lines[i].substr(2);
      default:
        // FIXME: What should happen here?
    }
  }
  if (sessionpart) {
    return SDPUtils.getDirection(sessionpart);
  }
  return 'sendrecv';
};

SDPUtils.getKind = function(mediaSection) {
  var lines = SDPUtils.splitLines(mediaSection);
  var mline = lines[0].split(' ');
  return mline[0].substr(2);
};

SDPUtils.isRejected = function(mediaSection) {
  return mediaSection.split(' ', 2)[1] === '0';
};

// Expose public methods.
module.exports = SDPUtils;

},{}],60:[function(require,module,exports){

module.exports = require('./lib/');

},{"./lib/":61}],61:[function(require,module,exports){

/**
 * Module dependencies.
 */

var url = require('./url');
var parser = require('socket.io-parser');
var Manager = require('./manager');
var debug = require('debug')('socket.io-client');

/**
 * Module exports.
 */

module.exports = exports = lookup;

/**
 * Managers cache.
 */

var cache = exports.managers = {};

/**
 * Looks up an existing `Manager` for multiplexing.
 * If the user summons:
 *
 *   `io('http://localhost/a');`
 *   `io('http://localhost/b');`
 *
 * We reuse the existing instance based on same scheme/port/host,
 * and we initialize sockets for each namespace.
 *
 * @api public
 */

function lookup(uri, opts) {
  if (typeof uri == 'object') {
    opts = uri;
    uri = undefined;
  }

  opts = opts || {};

  var parsed = url(uri);
  var source = parsed.source;
  var id = parsed.id;
  var io;

  if (opts.forceNew || opts['force new connection'] || false === opts.multiplex) {
    debug('ignoring socket cache for %s', source);
    io = Manager(source, opts);
  } else {
    if (!cache[id]) {
      debug('new io instance for %s', source);
      cache[id] = Manager(source, opts);
    }
    io = cache[id];
  }

  return io.socket(parsed.path);
}

/**
 * Protocol version.
 *
 * @api public
 */

exports.protocol = parser.protocol;

/**
 * `connect`.
 *
 * @param {String} uri
 * @api public
 */

exports.connect = lookup;

/**
 * Expose constructors for standalone build.
 *
 * @api public
 */

exports.Manager = require('./manager');
exports.Socket = require('./socket');

},{"./manager":62,"./socket":64,"./url":65,"debug":19,"socket.io-parser":67}],62:[function(require,module,exports){

/**
 * Module dependencies.
 */

var url = require('./url');
var eio = require('engine.io-client');
var Socket = require('./socket');
var Emitter = require('component-emitter');
var parser = require('socket.io-parser');
var on = require('./on');
var bind = require('component-bind');
var object = require('object-component');
var debug = require('debug')('socket.io-client:manager');
var indexOf = require('indexof');
var Backoff = require('backo2');

/**
 * Module exports
 */

module.exports = Manager;

/**
 * `Manager` constructor.
 *
 * @param {String} engine instance or engine uri/opts
 * @param {Object} options
 * @api public
 */

function Manager(uri, opts){
  if (!(this instanceof Manager)) return new Manager(uri, opts);
  if (uri && ('object' == typeof uri)) {
    opts = uri;
    uri = undefined;
  }
  opts = opts || {};

  opts.path = opts.path || '/socket.io';
  this.nsps = {};
  this.subs = [];
  this.opts = opts;
  this.reconnection(opts.reconnection !== false);
  this.reconnectionAttempts(opts.reconnectionAttempts || Infinity);
  this.reconnectionDelay(opts.reconnectionDelay || 1000);
  this.reconnectionDelayMax(opts.reconnectionDelayMax || 5000);
  this.randomizationFactor(opts.randomizationFactor || 0.5);
  this.backoff = new Backoff({
    min: this.reconnectionDelay(),
    max: this.reconnectionDelayMax(),
    jitter: this.randomizationFactor()
  });
  this.timeout(null == opts.timeout ? 20000 : opts.timeout);
  this.readyState = 'closed';
  this.uri = uri;
  this.connected = [];
  this.encoding = false;
  this.packetBuffer = [];
  this.encoder = new parser.Encoder();
  this.decoder = new parser.Decoder();
  this.autoConnect = opts.autoConnect !== false;
  if (this.autoConnect) this.open();
}

/**
 * Propagate given event to sockets and emit on `this`
 *
 * @api private
 */

Manager.prototype.emitAll = function() {
  this.emit.apply(this, arguments);
  for (var nsp in this.nsps) {
    this.nsps[nsp].emit.apply(this.nsps[nsp], arguments);
  }
};

/**
 * Update `socket.id` of all sockets
 *
 * @api private
 */

Manager.prototype.updateSocketIds = function(){
  for (var nsp in this.nsps) {
    this.nsps[nsp].id = this.engine.id;
  }
};

/**
 * Mix in `Emitter`.
 */

Emitter(Manager.prototype);

/**
 * Sets the `reconnection` config.
 *
 * @param {Boolean} true/false if it should automatically reconnect
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnection = function(v){
  if (!arguments.length) return this._reconnection;
  this._reconnection = !!v;
  return this;
};

/**
 * Sets the reconnection attempts config.
 *
 * @param {Number} max reconnection attempts before giving up
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionAttempts = function(v){
  if (!arguments.length) return this._reconnectionAttempts;
  this._reconnectionAttempts = v;
  return this;
};

/**
 * Sets the delay between reconnections.
 *
 * @param {Number} delay
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionDelay = function(v){
  if (!arguments.length) return this._reconnectionDelay;
  this._reconnectionDelay = v;
  this.backoff && this.backoff.setMin(v);
  return this;
};

Manager.prototype.randomizationFactor = function(v){
  if (!arguments.length) return this._randomizationFactor;
  this._randomizationFactor = v;
  this.backoff && this.backoff.setJitter(v);
  return this;
};

/**
 * Sets the maximum delay between reconnections.
 *
 * @param {Number} delay
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.reconnectionDelayMax = function(v){
  if (!arguments.length) return this._reconnectionDelayMax;
  this._reconnectionDelayMax = v;
  this.backoff && this.backoff.setMax(v);
  return this;
};

/**
 * Sets the connection timeout. `false` to disable
 *
 * @return {Manager} self or value
 * @api public
 */

Manager.prototype.timeout = function(v){
  if (!arguments.length) return this._timeout;
  this._timeout = v;
  return this;
};

/**
 * Starts trying to reconnect if reconnection is enabled and we have not
 * started reconnecting yet
 *
 * @api private
 */

Manager.prototype.maybeReconnectOnOpen = function() {
  // Only try to reconnect if it's the first time we're connecting
  if (!this.reconnecting && this._reconnection && this.backoff.attempts === 0) {
    // keeps reconnection from firing twice for the same reconnection loop
    this.reconnect();
  }
};


/**
 * Sets the current transport `socket`.
 *
 * @param {Function} optional, callback
 * @return {Manager} self
 * @api public
 */

Manager.prototype.open =
Manager.prototype.connect = function(fn){
  debug('readyState %s', this.readyState);
  if (~this.readyState.indexOf('open')) return this;

  debug('opening %s', this.uri);
  this.engine = eio(this.uri, this.opts);
  var socket = this.engine;
  var self = this;
  this.readyState = 'opening';
  this.skipReconnect = false;

  // emit `open`
  var openSub = on(socket, 'open', function() {
    self.onopen();
    fn && fn();
  });

  // emit `connect_error`
  var errorSub = on(socket, 'error', function(data){
    debug('connect_error');
    self.cleanup();
    self.readyState = 'closed';
    self.emitAll('connect_error', data);
    if (fn) {
      var err = new Error('Connection error');
      err.data = data;
      fn(err);
    } else {
      // Only do this if there is no fn to handle the error
      self.maybeReconnectOnOpen();
    }
  });

  // emit `connect_timeout`
  if (false !== this._timeout) {
    var timeout = this._timeout;
    debug('connect attempt will timeout after %d', timeout);

    // set timer
    var timer = setTimeout(function(){
      debug('connect attempt timed out after %d', timeout);
      openSub.destroy();
      socket.close();
      socket.emit('error', 'timeout');
      self.emitAll('connect_timeout', timeout);
    }, timeout);

    this.subs.push({
      destroy: function(){
        clearTimeout(timer);
      }
    });
  }

  this.subs.push(openSub);
  this.subs.push(errorSub);

  return this;
};

/**
 * Called upon transport open.
 *
 * @api private
 */

Manager.prototype.onopen = function(){
  debug('open');

  // clear old subs
  this.cleanup();

  // mark as open
  this.readyState = 'open';
  this.emit('open');

  // add new subs
  var socket = this.engine;
  this.subs.push(on(socket, 'data', bind(this, 'ondata')));
  this.subs.push(on(this.decoder, 'decoded', bind(this, 'ondecoded')));
  this.subs.push(on(socket, 'error', bind(this, 'onerror')));
  this.subs.push(on(socket, 'close', bind(this, 'onclose')));
};

/**
 * Called with data.
 *
 * @api private
 */

Manager.prototype.ondata = function(data){
  this.decoder.add(data);
};

/**
 * Called when parser fully decodes a packet.
 *
 * @api private
 */

Manager.prototype.ondecoded = function(packet) {
  this.emit('packet', packet);
};

/**
 * Called upon socket error.
 *
 * @api private
 */

Manager.prototype.onerror = function(err){
  debug('error', err);
  this.emitAll('error', err);
};

/**
 * Creates a new socket for the given `nsp`.
 *
 * @return {Socket}
 * @api public
 */

Manager.prototype.socket = function(nsp){
  var socket = this.nsps[nsp];
  if (!socket) {
    socket = new Socket(this, nsp);
    this.nsps[nsp] = socket;
    var self = this;
    socket.on('connect', function(){
      socket.id = self.engine.id;
      if (!~indexOf(self.connected, socket)) {
        self.connected.push(socket);
      }
    });
  }
  return socket;
};

/**
 * Called upon a socket close.
 *
 * @param {Socket} socket
 */

Manager.prototype.destroy = function(socket){
  var index = indexOf(this.connected, socket);
  if (~index) this.connected.splice(index, 1);
  if (this.connected.length) return;

  this.close();
};

/**
 * Writes a packet.
 *
 * @param {Object} packet
 * @api private
 */

Manager.prototype.packet = function(packet){
  debug('writing packet %j', packet);
  var self = this;

  if (!self.encoding) {
    // encode, then write to engine with result
    self.encoding = true;
    this.encoder.encode(packet, function(encodedPackets) {
      for (var i = 0; i < encodedPackets.length; i++) {
        self.engine.write(encodedPackets[i]);
      }
      self.encoding = false;
      self.processPacketQueue();
    });
  } else { // add packet to the queue
    self.packetBuffer.push(packet);
  }
};

/**
 * If packet buffer is non-empty, begins encoding the
 * next packet in line.
 *
 * @api private
 */

Manager.prototype.processPacketQueue = function() {
  if (this.packetBuffer.length > 0 && !this.encoding) {
    var pack = this.packetBuffer.shift();
    this.packet(pack);
  }
};

/**
 * Clean up transport subscriptions and packet buffer.
 *
 * @api private
 */

Manager.prototype.cleanup = function(){
  var sub;
  while (sub = this.subs.shift()) sub.destroy();

  this.packetBuffer = [];
  this.encoding = false;

  this.decoder.destroy();
};

/**
 * Close the current socket.
 *
 * @api private
 */

Manager.prototype.close =
Manager.prototype.disconnect = function(){
  this.skipReconnect = true;
  this.backoff.reset();
  this.readyState = 'closed';
  this.engine && this.engine.close();
};

/**
 * Called upon engine close.
 *
 * @api private
 */

Manager.prototype.onclose = function(reason){
  debug('close');
  this.cleanup();
  this.backoff.reset();
  this.readyState = 'closed';
  this.emit('close', reason);
  if (this._reconnection && !this.skipReconnect) {
    this.reconnect();
  }
};

/**
 * Attempt a reconnection.
 *
 * @api private
 */

Manager.prototype.reconnect = function(){
  if (this.reconnecting || this.skipReconnect) return this;

  var self = this;

  if (this.backoff.attempts >= this._reconnectionAttempts) {
    debug('reconnect failed');
    this.backoff.reset();
    this.emitAll('reconnect_failed');
    this.reconnecting = false;
  } else {
    var delay = this.backoff.duration();
    debug('will wait %dms before reconnect attempt', delay);

    this.reconnecting = true;
    var timer = setTimeout(function(){
      if (self.skipReconnect) return;

      debug('attempting reconnect');
      self.emitAll('reconnect_attempt', self.backoff.attempts);
      self.emitAll('reconnecting', self.backoff.attempts);

      // check again for the case socket closed in above events
      if (self.skipReconnect) return;

      self.open(function(err){
        if (err) {
          debug('reconnect attempt error');
          self.reconnecting = false;
          self.reconnect();
          self.emitAll('reconnect_error', err.data);
        } else {
          debug('reconnect success');
          self.onreconnect();
        }
      });
    }, delay);

    this.subs.push({
      destroy: function(){
        clearTimeout(timer);
      }
    });
  }
};

/**
 * Called upon successful reconnect.
 *
 * @api private
 */

Manager.prototype.onreconnect = function(){
  var attempt = this.backoff.attempts;
  this.reconnecting = false;
  this.backoff.reset();
  this.updateSocketIds();
  this.emitAll('reconnect', attempt);
};

},{"./on":63,"./socket":64,"./url":65,"backo2":13,"component-bind":16,"component-emitter":17,"debug":19,"engine.io-client":20,"indexof":41,"object-component":48,"socket.io-parser":67}],63:[function(require,module,exports){

/**
 * Module exports.
 */

module.exports = on;

/**
 * Helper for subscriptions.
 *
 * @param {Object|EventEmitter} obj with `Emitter` mixin or `EventEmitter`
 * @param {String} event name
 * @param {Function} callback
 * @api public
 */

function on(obj, ev, fn) {
  obj.on(ev, fn);
  return {
    destroy: function(){
      obj.removeListener(ev, fn);
    }
  };
}

},{}],64:[function(require,module,exports){

/**
 * Module dependencies.
 */

var parser = require('socket.io-parser');
var Emitter = require('component-emitter');
var toArray = require('to-array');
var on = require('./on');
var bind = require('component-bind');
var debug = require('debug')('socket.io-client:socket');
var hasBin = require('has-binary');

/**
 * Module exports.
 */

module.exports = exports = Socket;

/**
 * Internal events (blacklisted).
 * These events can't be emitted by the user.
 *
 * @api private
 */

var events = {
  connect: 1,
  connect_error: 1,
  connect_timeout: 1,
  disconnect: 1,
  error: 1,
  reconnect: 1,
  reconnect_attempt: 1,
  reconnect_failed: 1,
  reconnect_error: 1,
  reconnecting: 1
};

/**
 * Shortcut to `Emitter#emit`.
 */

var emit = Emitter.prototype.emit;

/**
 * `Socket` constructor.
 *
 * @api public
 */

function Socket(io, nsp){
  this.io = io;
  this.nsp = nsp;
  this.json = this; // compat
  this.ids = 0;
  this.acks = {};
  if (this.io.autoConnect) this.open();
  this.receiveBuffer = [];
  this.sendBuffer = [];
  this.connected = false;
  this.disconnected = true;
}

/**
 * Mix in `Emitter`.
 */

Emitter(Socket.prototype);

/**
 * Subscribe to open, close and packet events
 *
 * @api private
 */

Socket.prototype.subEvents = function() {
  if (this.subs) return;

  var io = this.io;
  this.subs = [
    on(io, 'open', bind(this, 'onopen')),
    on(io, 'packet', bind(this, 'onpacket')),
    on(io, 'close', bind(this, 'onclose'))
  ];
};

/**
 * "Opens" the socket.
 *
 * @api public
 */

Socket.prototype.open =
Socket.prototype.connect = function(){
  if (this.connected) return this;

  this.subEvents();
  this.io.open(); // ensure open
  if ('open' == this.io.readyState) this.onopen();
  return this;
};

/**
 * Sends a `message` event.
 *
 * @return {Socket} self
 * @api public
 */

Socket.prototype.send = function(){
  var args = toArray(arguments);
  args.unshift('message');
  this.emit.apply(this, args);
  return this;
};

/**
 * Override `emit`.
 * If the event is in `events`, it's emitted normally.
 *
 * @param {String} event name
 * @return {Socket} self
 * @api public
 */

Socket.prototype.emit = function(ev){
  if (events.hasOwnProperty(ev)) {
    emit.apply(this, arguments);
    return this;
  }

  var args = toArray(arguments);
  var parserType = parser.EVENT; // default
  if (hasBin(args)) { parserType = parser.BINARY_EVENT; } // binary
  var packet = { type: parserType, data: args };

  // event ack callback
  if ('function' == typeof args[args.length - 1]) {
    debug('emitting packet with ack id %d', this.ids);
    this.acks[this.ids] = args.pop();
    packet.id = this.ids++;
  }

  if (this.connected) {
    this.packet(packet);
  } else {
    this.sendBuffer.push(packet);
  }

  return this;
};

/**
 * Sends a packet.
 *
 * @param {Object} packet
 * @api private
 */

Socket.prototype.packet = function(packet){
  packet.nsp = this.nsp;
  this.io.packet(packet);
};

/**
 * Called upon engine `open`.
 *
 * @api private
 */

Socket.prototype.onopen = function(){
  debug('transport is open - connecting');

  // write connect packet if necessary
  if ('/' != this.nsp) {
    this.packet({ type: parser.CONNECT });
  }
};

/**
 * Called upon engine `close`.
 *
 * @param {String} reason
 * @api private
 */

Socket.prototype.onclose = function(reason){
  debug('close (%s)', reason);
  this.connected = false;
  this.disconnected = true;
  delete this.id;
  this.emit('disconnect', reason);
};

/**
 * Called with socket packet.
 *
 * @param {Object} packet
 * @api private
 */

Socket.prototype.onpacket = function(packet){
  if (packet.nsp != this.nsp) return;

  switch (packet.type) {
    case parser.CONNECT:
      this.onconnect();
      break;

    case parser.EVENT:
      this.onevent(packet);
      break;

    case parser.BINARY_EVENT:
      this.onevent(packet);
      break;

    case parser.ACK:
      this.onack(packet);
      break;

    case parser.BINARY_ACK:
      this.onack(packet);
      break;

    case parser.DISCONNECT:
      this.ondisconnect();
      break;

    case parser.ERROR:
      this.emit('error', packet.data);
      break;
  }
};

/**
 * Called upon a server event.
 *
 * @param {Object} packet
 * @api private
 */

Socket.prototype.onevent = function(packet){
  var args = packet.data || [];
  debug('emitting event %j', args);

  if (null != packet.id) {
    debug('attaching ack callback to event');
    args.push(this.ack(packet.id));
  }

  if (this.connected) {
    emit.apply(this, args);
  } else {
    this.receiveBuffer.push(args);
  }
};

/**
 * Produces an ack callback to emit with an event.
 *
 * @api private
 */

Socket.prototype.ack = function(id){
  var self = this;
  var sent = false;
  return function(){
    // prevent double callbacks
    if (sent) return;
    sent = true;
    var args = toArray(arguments);
    debug('sending ack %j', args);

    var type = hasBin(args) ? parser.BINARY_ACK : parser.ACK;
    self.packet({
      type: type,
      id: id,
      data: args
    });
  };
};

/**
 * Called upon a server acknowlegement.
 *
 * @param {Object} packet
 * @api private
 */

Socket.prototype.onack = function(packet){
  debug('calling ack %s with %j', packet.id, packet.data);
  var fn = this.acks[packet.id];
  fn.apply(this, packet.data);
  delete this.acks[packet.id];
};

/**
 * Called upon server connect.
 *
 * @api private
 */

Socket.prototype.onconnect = function(){
  this.connected = true;
  this.disconnected = false;
  this.emit('connect');
  this.emitBuffered();
};

/**
 * Emit buffered events (received and emitted).
 *
 * @api private
 */

Socket.prototype.emitBuffered = function(){
  var i;
  for (i = 0; i < this.receiveBuffer.length; i++) {
    emit.apply(this, this.receiveBuffer[i]);
  }
  this.receiveBuffer = [];

  for (i = 0; i < this.sendBuffer.length; i++) {
    this.packet(this.sendBuffer[i]);
  }
  this.sendBuffer = [];
};

/**
 * Called upon server disconnect.
 *
 * @api private
 */

Socket.prototype.ondisconnect = function(){
  debug('server disconnect (%s)', this.nsp);
  this.destroy();
  this.onclose('io server disconnect');
};

/**
 * Called upon forced client/server side disconnections,
 * this method ensures the manager stops tracking us and
 * that reconnections don't get triggered for this.
 *
 * @api private.
 */

Socket.prototype.destroy = function(){
  if (this.subs) {
    // clean subscriptions to avoid reconnections
    for (var i = 0; i < this.subs.length; i++) {
      this.subs[i].destroy();
    }
    this.subs = null;
  }

  this.io.destroy(this);
};

/**
 * Disconnects the socket manually.
 *
 * @return {Socket} self
 * @api public
 */

Socket.prototype.close =
Socket.prototype.disconnect = function(){
  if (this.connected) {
    debug('performing disconnect (%s)', this.nsp);
    this.packet({ type: parser.DISCONNECT });
  }

  // remove socket from pool
  this.destroy();

  if (this.connected) {
    // fire events
    this.onclose('io client disconnect');
  }
  return this;
};

},{"./on":63,"component-bind":16,"component-emitter":17,"debug":19,"has-binary":39,"socket.io-parser":67,"to-array":69}],65:[function(require,module,exports){
(function (global){

/**
 * Module dependencies.
 */

var parseuri = require('parseuri');
var debug = require('debug')('socket.io-client:url');

/**
 * Module exports.
 */

module.exports = url;

/**
 * URL parser.
 *
 * @param {String} url
 * @param {Object} An object meant to mimic window.location.
 *                 Defaults to window.location.
 * @api public
 */

function url(uri, loc){
  var obj = uri;

  // default to window.location
  var loc = loc || global.location;
  if (null == uri) uri = loc.protocol + '//' + loc.host;

  // relative path support
  if ('string' == typeof uri) {
    if ('/' == uri.charAt(0)) {
      if ('/' == uri.charAt(1)) {
        uri = loc.protocol + uri;
      } else {
        uri = loc.hostname + uri;
      }
    }

    if (!/^(https?|wss?):\/\//.test(uri)) {
      debug('protocol-less url %s', uri);
      if ('undefined' != typeof loc) {
        uri = loc.protocol + '//' + uri;
      } else {
        uri = 'https://' + uri;
      }
    }

    // parse
    debug('parse %s', uri);
    obj = parseuri(uri);
  }

  // make sure we treat `localhost:80` and `localhost` equally
  if (!obj.port) {
    if (/^(http|ws)$/.test(obj.protocol)) {
      obj.port = '80';
    }
    else if (/^(http|ws)s$/.test(obj.protocol)) {
      obj.port = '443';
    }
  }

  obj.path = obj.path || '/';

  // define unique id
  obj.id = obj.protocol + '://' + obj.host + ':' + obj.port;
  // define href
  obj.href = obj.protocol + '://' + obj.host + (loc && loc.port == obj.port ? '' : (':' + obj.port));

  return obj;
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"debug":19,"parseuri":51}],66:[function(require,module,exports){
(function (global){
/*global Blob,File*/

/**
 * Module requirements
 */

var isArray = require('isarray');
var isBuf = require('./is-buffer');

/**
 * Replaces every Buffer | ArrayBuffer in packet with a numbered placeholder.
 * Anything with blobs or files should be fed through removeBlobs before coming
 * here.
 *
 * @param {Object} packet - socket.io event packet
 * @return {Object} with deconstructed packet and list of buffers
 * @api public
 */

exports.deconstructPacket = function(packet){
  var buffers = [];
  var packetData = packet.data;

  function _deconstructPacket(data) {
    if (!data) return data;

    if (isBuf(data)) {
      var placeholder = { _placeholder: true, num: buffers.length };
      buffers.push(data);
      return placeholder;
    } else if (isArray(data)) {
      var newData = new Array(data.length);
      for (var i = 0; i < data.length; i++) {
        newData[i] = _deconstructPacket(data[i]);
      }
      return newData;
    } else if ('object' == typeof data && !(data instanceof Date)) {
      var newData = {};
      for (var key in data) {
        newData[key] = _deconstructPacket(data[key]);
      }
      return newData;
    }
    return data;
  }

  var pack = packet;
  pack.data = _deconstructPacket(packetData);
  pack.attachments = buffers.length; // number of binary 'attachments'
  return {packet: pack, buffers: buffers};
};

/**
 * Reconstructs a binary packet from its placeholder packet and buffers
 *
 * @param {Object} packet - event packet with placeholders
 * @param {Array} buffers - binary buffers to put in placeholder positions
 * @return {Object} reconstructed packet
 * @api public
 */

exports.reconstructPacket = function(packet, buffers) {
  var curPlaceHolder = 0;

  function _reconstructPacket(data) {
    if (data && data._placeholder) {
      var buf = buffers[data.num]; // appropriate buffer (should be natural order anyway)
      return buf;
    } else if (isArray(data)) {
      for (var i = 0; i < data.length; i++) {
        data[i] = _reconstructPacket(data[i]);
      }
      return data;
    } else if (data && 'object' == typeof data) {
      for (var key in data) {
        data[key] = _reconstructPacket(data[key]);
      }
      return data;
    }
    return data;
  }

  packet.data = _reconstructPacket(packet.data);
  packet.attachments = undefined; // no longer useful
  return packet;
};

/**
 * Asynchronously removes Blobs or Files from data via
 * FileReader's readAsArrayBuffer method. Used before encoding
 * data as msgpack. Calls callback with the blobless data.
 *
 * @param {Object} data
 * @param {Function} callback
 * @api private
 */

exports.removeBlobs = function(data, callback) {
  function _removeBlobs(obj, curKey, containingObject) {
    if (!obj) return obj;

    // convert any blob
    if ((global.Blob && obj instanceof Blob) ||
        (global.File && obj instanceof File)) {
      pendingBlobs++;

      // async filereader
      var fileReader = new FileReader();
      fileReader.onload = function() { // this.result == arraybuffer
        if (containingObject) {
          containingObject[curKey] = this.result;
        }
        else {
          bloblessData = this.result;
        }

        // if nothing pending its callback time
        if(! --pendingBlobs) {
          callback(bloblessData);
        }
      };

      fileReader.readAsArrayBuffer(obj); // blob -> arraybuffer
    } else if (isArray(obj)) { // handle array
      for (var i = 0; i < obj.length; i++) {
        _removeBlobs(obj[i], i, obj);
      }
    } else if (obj && 'object' == typeof obj && !isBuf(obj)) { // and object
      for (var key in obj) {
        _removeBlobs(obj[key], key, obj);
      }
    }
  }

  var pendingBlobs = 0;
  var bloblessData = data;
  _removeBlobs(bloblessData);
  if (!pendingBlobs) {
    callback(bloblessData);
  }
};

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./is-buffer":68,"isarray":42}],67:[function(require,module,exports){

/**
 * Module dependencies.
 */

var debug = require('debug')('socket.io-parser');
var json = require('json3');
var isArray = require('isarray');
var Emitter = require('component-emitter');
var binary = require('./binary');
var isBuf = require('./is-buffer');

/**
 * Protocol version.
 *
 * @api public
 */

exports.protocol = 4;

/**
 * Packet types.
 *
 * @api public
 */

exports.types = [
  'CONNECT',
  'DISCONNECT',
  'EVENT',
  'BINARY_EVENT',
  'ACK',
  'BINARY_ACK',
  'ERROR'
];

/**
 * Packet type `connect`.
 *
 * @api public
 */

exports.CONNECT = 0;

/**
 * Packet type `disconnect`.
 *
 * @api public
 */

exports.DISCONNECT = 1;

/**
 * Packet type `event`.
 *
 * @api public
 */

exports.EVENT = 2;

/**
 * Packet type `ack`.
 *
 * @api public
 */

exports.ACK = 3;

/**
 * Packet type `error`.
 *
 * @api public
 */

exports.ERROR = 4;

/**
 * Packet type 'binary event'
 *
 * @api public
 */

exports.BINARY_EVENT = 5;

/**
 * Packet type `binary ack`. For acks with binary arguments.
 *
 * @api public
 */

exports.BINARY_ACK = 6;

/**
 * Encoder constructor.
 *
 * @api public
 */

exports.Encoder = Encoder;

/**
 * Decoder constructor.
 *
 * @api public
 */

exports.Decoder = Decoder;

/**
 * A socket.io Encoder instance
 *
 * @api public
 */

function Encoder() {}

/**
 * Encode a packet as a single string if non-binary, or as a
 * buffer sequence, depending on packet type.
 *
 * @param {Object} obj - packet object
 * @param {Function} callback - function to handle encodings (likely engine.write)
 * @return Calls callback with Array of encodings
 * @api public
 */

Encoder.prototype.encode = function(obj, callback){
  debug('encoding packet %j', obj);

  if (exports.BINARY_EVENT == obj.type || exports.BINARY_ACK == obj.type) {
    encodeAsBinary(obj, callback);
  }
  else {
    var encoding = encodeAsString(obj);
    callback([encoding]);
  }
};

/**
 * Encode packet as string.
 *
 * @param {Object} packet
 * @return {String} encoded
 * @api private
 */

function encodeAsString(obj) {
  var str = '';
  var nsp = false;

  // first is type
  str += obj.type;

  // attachments if we have them
  if (exports.BINARY_EVENT == obj.type || exports.BINARY_ACK == obj.type) {
    str += obj.attachments;
    str += '-';
  }

  // if we have a namespace other than `/`
  // we append it followed by a comma `,`
  if (obj.nsp && '/' != obj.nsp) {
    nsp = true;
    str += obj.nsp;
  }

  // immediately followed by the id
  if (null != obj.id) {
    if (nsp) {
      str += ',';
      nsp = false;
    }
    str += obj.id;
  }

  // json data
  if (null != obj.data) {
    if (nsp) str += ',';
    str += json.stringify(obj.data);
  }

  debug('encoded %j as %s', obj, str);
  return str;
}

/**
 * Encode packet as 'buffer sequence' by removing blobs, and
 * deconstructing packet into object with placeholders and
 * a list of buffers.
 *
 * @param {Object} packet
 * @return {Buffer} encoded
 * @api private
 */

function encodeAsBinary(obj, callback) {

  function writeEncoding(bloblessData) {
    var deconstruction = binary.deconstructPacket(bloblessData);
    var pack = encodeAsString(deconstruction.packet);
    var buffers = deconstruction.buffers;

    buffers.unshift(pack); // add packet info to beginning of data list
    callback(buffers); // write all the buffers
  }

  binary.removeBlobs(obj, writeEncoding);
}

/**
 * A socket.io Decoder instance
 *
 * @return {Object} decoder
 * @api public
 */

function Decoder() {
  this.reconstructor = null;
}

/**
 * Mix in `Emitter` with Decoder.
 */

Emitter(Decoder.prototype);

/**
 * Decodes an ecoded packet string into packet JSON.
 *
 * @param {String} obj - encoded packet
 * @return {Object} packet
 * @api public
 */

Decoder.prototype.add = function(obj) {
  var packet;
  if ('string' == typeof obj) {
    packet = decodeString(obj);
    if (exports.BINARY_EVENT == packet.type || exports.BINARY_ACK == packet.type) { // binary packet's json
      this.reconstructor = new BinaryReconstructor(packet);

      // no attachments, labeled binary but no binary data to follow
      if (this.reconstructor.reconPack.attachments === 0) {
        this.emit('decoded', packet);
      }
    } else { // non-binary full packet
      this.emit('decoded', packet);
    }
  }
  else if (isBuf(obj) || obj.base64) { // raw binary data
    if (!this.reconstructor) {
      throw new Error('got binary data when not reconstructing a packet');
    } else {
      packet = this.reconstructor.takeBinaryData(obj);
      if (packet) { // received final buffer
        this.reconstructor = null;
        this.emit('decoded', packet);
      }
    }
  }
  else {
    throw new Error('Unknown type: ' + obj);
  }
};

/**
 * Decode a packet String (JSON data)
 *
 * @param {String} str
 * @return {Object} packet
 * @api private
 */

function decodeString(str) {
  var p = {};
  var i = 0;

  // look up type
  p.type = Number(str.charAt(0));
  if (null == exports.types[p.type]) return error();

  // look up attachments if type binary
  if (exports.BINARY_EVENT == p.type || exports.BINARY_ACK == p.type) {
    var buf = '';
    while (str.charAt(++i) != '-') {
      buf += str.charAt(i);
      if (i == str.length) break;
    }
    if (buf != Number(buf) || str.charAt(i) != '-') {
      throw new Error('Illegal attachments');
    }
    p.attachments = Number(buf);
  }

  // look up namespace (if any)
  if ('/' == str.charAt(i + 1)) {
    p.nsp = '';
    while (++i) {
      var c = str.charAt(i);
      if (',' == c) break;
      p.nsp += c;
      if (i == str.length) break;
    }
  } else {
    p.nsp = '/';
  }

  // look up id
  var next = str.charAt(i + 1);
  if ('' !== next && Number(next) == next) {
    p.id = '';
    while (++i) {
      var c = str.charAt(i);
      if (null == c || Number(c) != c) {
        --i;
        break;
      }
      p.id += str.charAt(i);
      if (i == str.length) break;
    }
    p.id = Number(p.id);
  }

  // look up json data
  if (str.charAt(++i)) {
    try {
      p.data = json.parse(str.substr(i));
    } catch(e){
      return error();
    }
  }

  debug('decoded %s as %j', str, p);
  return p;
}

/**
 * Deallocates a parser's resources
 *
 * @api public
 */

Decoder.prototype.destroy = function() {
  if (this.reconstructor) {
    this.reconstructor.finishedReconstruction();
  }
};

/**
 * A manager of a binary event's 'buffer sequence'. Should
 * be constructed whenever a packet of type BINARY_EVENT is
 * decoded.
 *
 * @param {Object} packet
 * @return {BinaryReconstructor} initialized reconstructor
 * @api private
 */

function BinaryReconstructor(packet) {
  this.reconPack = packet;
  this.buffers = [];
}

/**
 * Method to be called when binary data received from connection
 * after a BINARY_EVENT packet.
 *
 * @param {Buffer | ArrayBuffer} binData - the raw binary data received
 * @return {null | Object} returns null if more binary data is expected or
 *   a reconstructed packet object if all buffers have been received.
 * @api private
 */

BinaryReconstructor.prototype.takeBinaryData = function(binData) {
  this.buffers.push(binData);
  if (this.buffers.length == this.reconPack.attachments) { // done with buffer list
    var packet = binary.reconstructPacket(this.reconPack, this.buffers);
    this.finishedReconstruction();
    return packet;
  }
  return null;
};

/**
 * Cleans up binary packet reconstruction variables.
 *
 * @api private
 */

BinaryReconstructor.prototype.finishedReconstruction = function() {
  this.reconPack = null;
  this.buffers = [];
};

function error(data){
  return {
    type: exports.ERROR,
    data: 'parser error'
  };
}

},{"./binary":66,"./is-buffer":68,"component-emitter":17,"debug":19,"isarray":42,"json3":43}],68:[function(require,module,exports){
(function (global){

module.exports = isBuf;

/**
 * Returns true if obj is a buffer or an arraybuffer.
 *
 * @api private
 */

function isBuf(obj) {
  return (global.Buffer && global.Buffer.isBuffer(obj)) ||
         (global.ArrayBuffer && obj instanceof ArrayBuffer);
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],69:[function(require,module,exports){
module.exports = toArray

function toArray(list, index) {
    var array = []

    index = index || 0

    for (var i = index || 0; i < list.length; i++) {
        array[i - index] = list[i]
    }

    return array
}

},{}],70:[function(require,module,exports){
(function (global){
/*! https://mths.be/utf8js v2.0.0 by @mathias */
;(function(root) {

	// Detect free variables `exports`
	var freeExports = typeof exports == 'object' && exports;

	// Detect free variable `module`
	var freeModule = typeof module == 'object' && module &&
		module.exports == freeExports && module;

	// Detect free variable `global`, from Node.js or Browserified code,
	// and use it as `root`
	var freeGlobal = typeof global == 'object' && global;
	if (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal) {
		root = freeGlobal;
	}

	/*--------------------------------------------------------------------------*/

	var stringFromCharCode = String.fromCharCode;

	// Taken from https://mths.be/punycode
	function ucs2decode(string) {
		var output = [];
		var counter = 0;
		var length = string.length;
		var value;
		var extra;
		while (counter < length) {
			value = string.charCodeAt(counter++);
			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
				// high surrogate, and there is a next character
				extra = string.charCodeAt(counter++);
				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
				} else {
					// unmatched surrogate; only append this code unit, in case the next
					// code unit is the high surrogate of a surrogate pair
					output.push(value);
					counter--;
				}
			} else {
				output.push(value);
			}
		}
		return output;
	}

	// Taken from https://mths.be/punycode
	function ucs2encode(array) {
		var length = array.length;
		var index = -1;
		var value;
		var output = '';
		while (++index < length) {
			value = array[index];
			if (value > 0xFFFF) {
				value -= 0x10000;
				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
				value = 0xDC00 | value & 0x3FF;
			}
			output += stringFromCharCode(value);
		}
		return output;
	}

	function checkScalarValue(codePoint) {
		if (codePoint >= 0xD800 && codePoint <= 0xDFFF) {
			throw Error(
				'Lone surrogate U+' + codePoint.toString(16).toUpperCase() +
				' is not a scalar value'
			);
		}
	}
	/*--------------------------------------------------------------------------*/

	function createByte(codePoint, shift) {
		return stringFromCharCode(((codePoint >> shift) & 0x3F) | 0x80);
	}

	function encodeCodePoint(codePoint) {
		if ((codePoint & 0xFFFFFF80) == 0) { // 1-byte sequence
			return stringFromCharCode(codePoint);
		}
		var symbol = '';
		if ((codePoint & 0xFFFFF800) == 0) { // 2-byte sequence
			symbol = stringFromCharCode(((codePoint >> 6) & 0x1F) | 0xC0);
		}
		else if ((codePoint & 0xFFFF0000) == 0) { // 3-byte sequence
			checkScalarValue(codePoint);
			symbol = stringFromCharCode(((codePoint >> 12) & 0x0F) | 0xE0);
			symbol += createByte(codePoint, 6);
		}
		else if ((codePoint & 0xFFE00000) == 0) { // 4-byte sequence
			symbol = stringFromCharCode(((codePoint >> 18) & 0x07) | 0xF0);
			symbol += createByte(codePoint, 12);
			symbol += createByte(codePoint, 6);
		}
		symbol += stringFromCharCode((codePoint & 0x3F) | 0x80);
		return symbol;
	}

	function utf8encode(string) {
		var codePoints = ucs2decode(string);
		var length = codePoints.length;
		var index = -1;
		var codePoint;
		var byteString = '';
		while (++index < length) {
			codePoint = codePoints[index];
			byteString += encodeCodePoint(codePoint);
		}
		return byteString;
	}

	/*--------------------------------------------------------------------------*/

	function readContinuationByte() {
		if (byteIndex >= byteCount) {
			throw Error('Invalid byte index');
		}

		var continuationByte = byteArray[byteIndex] & 0xFF;
		byteIndex++;

		if ((continuationByte & 0xC0) == 0x80) {
			return continuationByte & 0x3F;
		}

		// If we end up here, it’s not a continuation byte
		throw Error('Invalid continuation byte');
	}

	function decodeSymbol() {
		var byte1;
		var byte2;
		var byte3;
		var byte4;
		var codePoint;

		if (byteIndex > byteCount) {
			throw Error('Invalid byte index');
		}

		if (byteIndex == byteCount) {
			return false;
		}

		// Read first byte
		byte1 = byteArray[byteIndex] & 0xFF;
		byteIndex++;

		// 1-byte sequence (no continuation bytes)
		if ((byte1 & 0x80) == 0) {
			return byte1;
		}

		// 2-byte sequence
		if ((byte1 & 0xE0) == 0xC0) {
			var byte2 = readContinuationByte();
			codePoint = ((byte1 & 0x1F) << 6) | byte2;
			if (codePoint >= 0x80) {
				return codePoint;
			} else {
				throw Error('Invalid continuation byte');
			}
		}

		// 3-byte sequence (may include unpaired surrogates)
		if ((byte1 & 0xF0) == 0xE0) {
			byte2 = readContinuationByte();
			byte3 = readContinuationByte();
			codePoint = ((byte1 & 0x0F) << 12) | (byte2 << 6) | byte3;
			if (codePoint >= 0x0800) {
				checkScalarValue(codePoint);
				return codePoint;
			} else {
				throw Error('Invalid continuation byte');
			}
		}

		// 4-byte sequence
		if ((byte1 & 0xF8) == 0xF0) {
			byte2 = readContinuationByte();
			byte3 = readContinuationByte();
			byte4 = readContinuationByte();
			codePoint = ((byte1 & 0x0F) << 0x12) | (byte2 << 0x0C) |
				(byte3 << 0x06) | byte4;
			if (codePoint >= 0x010000 && codePoint <= 0x10FFFF) {
				return codePoint;
			}
		}

		throw Error('Invalid UTF-8 detected');
	}

	var byteArray;
	var byteCount;
	var byteIndex;
	function utf8decode(byteString) {
		byteArray = ucs2decode(byteString);
		byteCount = byteArray.length;
		byteIndex = 0;
		var codePoints = [];
		var tmp;
		while ((tmp = decodeSymbol()) !== false) {
			codePoints.push(tmp);
		}
		return ucs2encode(codePoints);
	}

	/*--------------------------------------------------------------------------*/

	var utf8 = {
		'version': '2.0.0',
		'encode': utf8encode,
		'decode': utf8decode
	};

	// Some AMD build optimizers, like r.js, check for specific condition patterns
	// like the following:
	if (
		typeof define == 'function' &&
		typeof define.amd == 'object' &&
		define.amd
	) {
		define(function() {
			return utf8;
		});
	}	else if (freeExports && !freeExports.nodeType) {
		if (freeModule) { // in Node.js or RingoJS v0.8.0+
			freeModule.exports = utf8;
		} else { // in Narwhal or RingoJS v0.7.0-
			var object = {};
			var hasOwnProperty = object.hasOwnProperty;
			for (var key in utf8) {
				hasOwnProperty.call(utf8, key) && (freeExports[key] = utf8[key]);
			}
		}
	} else { // in Rhino or a web browser
		root.utf8 = utf8;
	}

}(this));

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],71:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],72:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],73:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = require('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":72,"_process":52,"inherits":71}],74:[function(require,module,exports){
// created by @HenrikJoreteg
var prefix;
var version;

if (window.mozRTCPeerConnection || navigator.mozGetUserMedia) {
    prefix = 'moz';
    version = parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);
} else if (window.webkitRTCPeerConnection || navigator.webkitGetUserMedia) {
    prefix = 'webkit';
    version = navigator.userAgent.match(/Chrom(e|ium)/) && parseInt(navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./)[2], 10);
}

var PC = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
var IceCandidate = window.mozRTCIceCandidate || window.RTCIceCandidate;
var SessionDescription = window.mozRTCSessionDescription || window.RTCSessionDescription;
var MediaStream = window.webkitMediaStream || window.MediaStream;
var screenSharing = window.location.protocol === 'https:' &&
    ((prefix === 'webkit' && version >= 26) ||
     (prefix === 'moz' && version >= 33))
var AudioContext = window.AudioContext || window.webkitAudioContext;
var videoEl = document.createElement('video');
var supportVp8 = videoEl && videoEl.canPlayType && videoEl.canPlayType('video/webm; codecs="vp8", vorbis') === "probably";
var getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.msGetUserMedia || navigator.mozGetUserMedia;

// export support flags and constructors.prototype && PC
module.exports = {
    prefix: prefix,
    browserVersion: version,
    support: !!PC && !!getUserMedia,
    // new support style
    supportRTCPeerConnection: !!PC,
    supportVp8: supportVp8,
    supportGetUserMedia: !!getUserMedia,
    supportDataChannel: !!(PC && PC.prototype && PC.prototype.createDataChannel),
    supportWebAudio: !!(AudioContext && AudioContext.prototype.createMediaStreamSource),
    supportMediaStream: !!(MediaStream && MediaStream.prototype.removeTrack),
    supportScreenSharing: !!screenSharing,
    // constructors
    AudioContext: AudioContext,
    PeerConnection: PC,
    SessionDescription: SessionDescription,
    IceCandidate: IceCandidate,
    MediaStream: MediaStream,
    getUserMedia: getUserMedia
};

},{}],75:[function(require,module,exports){
/*
WildEmitter.js is a slim little event emitter by @henrikjoreteg largely based
on @visionmedia's Emitter from UI Kit.

Why? I wanted it standalone.

I also wanted support for wildcard emitters like this:

emitter.on('*', function (eventName, other, event, payloads) {

});

emitter.on('somenamespace*', function (eventName, payloads) {

});

Please note that callbacks triggered by wildcard registered events also get
the event name as the first argument.
*/

module.exports = WildEmitter;

function WildEmitter() { }

WildEmitter.mixin = function (constructor) {
    var prototype = constructor.prototype || constructor;

    prototype.isWildEmitter= true;

    // Listen on the given `event` with `fn`. Store a group name if present.
    prototype.on = function (event, groupName, fn) {
        this.callbacks = this.callbacks || {};
        var hasGroup = (arguments.length === 3),
            group = hasGroup ? arguments[1] : undefined,
            func = hasGroup ? arguments[2] : arguments[1];
        func._groupName = group;
        (this.callbacks[event] = this.callbacks[event] || []).push(func);
        return this;
    };

    // Adds an `event` listener that will be invoked a single
    // time then automatically removed.
    prototype.once = function (event, groupName, fn) {
        var self = this,
            hasGroup = (arguments.length === 3),
            group = hasGroup ? arguments[1] : undefined,
            func = hasGroup ? arguments[2] : arguments[1];
        function on() {
            self.off(event, on);
            func.apply(this, arguments);
        }
        this.on(event, group, on);
        return this;
    };

    // Unbinds an entire group
    prototype.releaseGroup = function (groupName) {
        this.callbacks = this.callbacks || {};
        var item, i, len, handlers;
        for (item in this.callbacks) {
            handlers = this.callbacks[item];
            for (i = 0, len = handlers.length; i < len; i++) {
                if (handlers[i]._groupName === groupName) {
                    //console.log('removing');
                    // remove it and shorten the array we're looping through
                    handlers.splice(i, 1);
                    i--;
                    len--;
                }
            }
        }
        return this;
    };

    // Remove the given callback for `event` or all
    // registered callbacks.
    prototype.off = function (event, fn) {
        this.callbacks = this.callbacks || {};
        var callbacks = this.callbacks[event],
            i;

        if (!callbacks) return this;

        // remove all handlers
        if (arguments.length === 1) {
            delete this.callbacks[event];
            return this;
        }

        // remove specific handler
        i = callbacks.indexOf(fn);
        callbacks.splice(i, 1);
        if (callbacks.length === 0) {
            delete this.callbacks[event];
        }
        return this;
    };

    /// Emit `event` with the given args.
    // also calls any `*` handlers
    prototype.emit = function (event) {
        this.callbacks = this.callbacks || {};
        var args = [].slice.call(arguments, 1),
            callbacks = this.callbacks[event],
            specialCallbacks = this.getWildcardCallbacks(event),
            i,
            len,
            item,
            listeners;

        if (callbacks) {
            listeners = callbacks.slice();
            for (i = 0, len = listeners.length; i < len; ++i) {
                if (!listeners[i]) {
                    break;
                }
                listeners[i].apply(this, args);
            }
        }

        if (specialCallbacks) {
            len = specialCallbacks.length;
            listeners = specialCallbacks.slice();
            for (i = 0, len = listeners.length; i < len; ++i) {
                if (!listeners[i]) {
                    break;
                }
                listeners[i].apply(this, [event].concat(args));
            }
        }

        return this;
    };

    // Helper for for finding special wildcard event handlers that match the event
    prototype.getWildcardCallbacks = function (eventName) {
        this.callbacks = this.callbacks || {};
        var item,
            split,
            result = [];

        for (item in this.callbacks) {
            split = item.split('*');
            if (item === '*' || (split.length === 2 && eventName.slice(0, split[0].length) === split[0])) {
                result = result.concat(this.callbacks[item]);
            }
        }
        return result;
    };

};

WildEmitter.mixin(WildEmitter);

},{}],76:[function(require,module,exports){

/**
 * Module dependencies.
 */

var global = (function() { return this; })();

/**
 * WebSocket constructor.
 */

var WebSocket = global.WebSocket || global.MozWebSocket;

/**
 * Module exports.
 */

module.exports = WebSocket ? ws : null;

/**
 * WebSocket constructor.
 *
 * The third `opts` options object gets ignored in web browsers, since it's
 * non-standard, and throws a TypeError if passed to the constructor.
 * See: https://github.com/einaros/ws/issues/227
 *
 * @param {String} uri
 * @param {Array} protocols (optional)
 * @param {Object) opts (optional)
 * @api public
 */

function ws(uri, protocols, opts) {
  var instance;
  if (protocols) {
    instance = new WebSocket(uri, protocols);
  } else {
    instance = new WebSocket(uri);
  }
  return instance;
}

if (WebSocket) ws.prototype = WebSocket.prototype;

},{}],77:[function(require,module,exports){
var util = require('util');
var webrtcSupport = require('webrtcsupport');
var PeerConnection = require('rtcpeerconnection');
var WildEmitter = require('wildemitter');
var FileTransfer = require('filetransfer');

// the inband-v1 protocol is sending metadata inband in a serialized JSON object
// followed by the actual data. Receiver closes the datachannel upon completion
var INBAND_FILETRANSFER_V1 = 'https://simplewebrtc.com/protocol/filetransfer#inband-v1';

function isAllTracksEnded(stream) {
    var isAllTracksEnded = true;
    stream.getTracks().forEach(function (t) {
        isAllTracksEnded = t.readyState === 'ended' && isAllTracksEnded;
    });
    return isAllTracksEnded;
}

function Peer(options) {
    var self = this;

    // call emitter constructor
    WildEmitter.call(this);

    this.id = options.id;
    this.parent = options.parent;
    this.type = options.type || 'video';
    this.oneway = options.oneway || false;
    this.sharemyscreen = options.sharemyscreen || false;
    this.browserPrefix = options.prefix;
    this.stream = options.stream;
    this.enableDataChannels = options.enableDataChannels === undefined ? this.parent.config.enableDataChannels : options.enableDataChannels;
    this.receiveMedia = options.receiveMedia || this.parent.config.receiveMedia;
    this.channels = {};
    this.sid = options.sid || Date.now().toString();
    // Create an RTCPeerConnection via the polyfill
    this.pc = new PeerConnection(this.parent.config.peerConnectionConfig, this.parent.config.peerConnectionConstraints);
    this.pc.on('ice', this.onIceCandidate.bind(this));
    this.pc.on('endOfCandidates', function (event) {
        self.send('endOfCandidates', event);
    });
    this.pc.on('offer', function (offer) {
        if (self.parent.config.nick) offer.nick = self.parent.config.nick;
        self.send('offer', offer);
    });
    this.pc.on('answer', function (answer) {
        if (self.parent.config.nick) answer.nick = self.parent.config.nick;
        self.send('answer', answer);
    });
    this.pc.on('addStream', this.handleRemoteStreamAdded.bind(this));
    this.pc.on('addChannel', this.handleDataChannelAdded.bind(this));
    this.pc.on('removeStream', this.handleStreamRemoved.bind(this));
    // Just fire negotiation needed events for now
    // When browser re-negotiation handling seems to work
    // we can use this as the trigger for starting the offer/answer process
    // automatically. We'll just leave it be for now while this stabalizes.
    this.pc.on('negotiationNeeded', this.emit.bind(this, 'negotiationNeeded'));
    this.pc.on('iceConnectionStateChange', this.emit.bind(this, 'iceConnectionStateChange'));
    this.pc.on('iceConnectionStateChange', function () {
        switch (self.pc.iceConnectionState) {
        case 'failed':
            // currently, in chrome only the initiator goes to failed
            // so we need to signal this to the peer
            if (self.pc.pc.localDescription.type === 'offer') {
                self.parent.emit('iceFailed', self);
                self.send('connectivityError');
            }
            break;
        }
    });
    this.pc.on('signalingStateChange', this.emit.bind(this, 'signalingStateChange'));
    this.logger = this.parent.logger;

    // handle screensharing/broadcast mode
    if (options.type === 'screen') {
        if (this.parent.localScreens && this.parent.localScreens[0] && this.sharemyscreen) {
            this.logger.log('adding local screen stream to peer connection');
            this.pc.addStream(this.parent.localScreens[0]);
            this.broadcaster = options.broadcaster;
        }
    } else {
        this.parent.localStreams.forEach(function (stream) {
            self.pc.addStream(stream);
        });
    }

    this.on('channelOpen', function (channel) {
        if (channel.protocol === INBAND_FILETRANSFER_V1) {
            channel.onmessage = function (event) {
                var metadata = JSON.parse(event.data);
                var receiver = new FileTransfer.Receiver();
                receiver.receive(metadata, channel);
                self.emit('fileTransfer', metadata, receiver);
                receiver.on('receivedFile', function (file, metadata) {
                    receiver.channel.close();
                });
            };
        }
    });

    // proxy events to parent
    this.on('*', function () {
        self.parent.emit.apply(self.parent, arguments);
    });
}

util.inherits(Peer, WildEmitter);

Peer.prototype.handleMessage = function (message) {
    var self = this;

    this.logger.log('getting', message.type, message);

    if (message.prefix) this.browserPrefix = message.prefix;

    if (message.type === 'offer') {
        if (!this.nick) this.nick = message.payload.nick;
        delete message.payload.nick;
        this.pc.handleOffer(message.payload, function (err) {
            if (err) {
                return;
            }
            // auto-accept
            self.pc.answer(function (err, sessionDescription) {
                //self.send('answer', sessionDescription);
            });
        });
    } else if (message.type === 'answer') {
        if (!this.nick) this.nick = message.payload.nick;
        delete message.payload.nick;
        this.pc.handleAnswer(message.payload);
    } else if (message.type === 'candidate') {
        this.pc.processIce(message.payload);
    } else if (message.type === 'connectivityError') {
        this.parent.emit('connectivityError', self);
    } else if (message.type === 'mute') {
        this.parent.emit('mute', {id: message.from, name: message.payload.name});
    } else if (message.type === 'unmute') {
        this.parent.emit('unmute', {id: message.from, name: message.payload.name});
    } else if (message.type === 'endOfCandidates') {
        // Edge requires an end-of-candidates. Since only Edge will have mLines or tracks on the
        // shim this will only be called in Edge.
        var mLines = this.pc.pc.transceivers || [];
        mLines.forEach(function (mLine) {
            if (mLine.iceTransport) {
                mLine.iceTransport.addRemoteCandidate({});
            }
        });
    }
};

// send via signalling channel
Peer.prototype.send = function (messageType, payload) {
    var message = {
        to: this.id,
        sid: this.sid,
        broadcaster: this.broadcaster,
        roomType: this.type,
        type: messageType,
        payload: payload,
        prefix: webrtcSupport.prefix
    };
    this.logger.log('sending', messageType, message);
    this.parent.emit('message', message);
};

// send via data channel
// returns true when message was sent and false if channel is not open
Peer.prototype.sendDirectly = function (channel, messageType, payload) {
    var message = {
        type: messageType,
        payload: payload
    };
    this.logger.log('sending via datachannel', channel, messageType, message);
    var dc = this.getDataChannel(channel);
    if (dc.readyState != 'open') return false;
    dc.send(JSON.stringify(message));
    return true;
};

// Internal method registering handlers for a data channel and emitting events on the peer
Peer.prototype._observeDataChannel = function (channel) {
    var self = this;
    channel.onclose = this.emit.bind(this, 'channelClose', channel);
    channel.onerror = this.emit.bind(this, 'channelError', channel);
    channel.onmessage = function (event) {
        self.emit('channelMessage', self, channel.label, JSON.parse(event.data), channel, event);
    };
    channel.onopen = this.emit.bind(this, 'channelOpen', channel);
};

// Fetch or create a data channel by the given name
Peer.prototype.getDataChannel = function (name, opts) {
    if (!webrtcSupport.supportDataChannel) return this.emit('error', new Error('createDataChannel not supported'));
    var channel = this.channels[name];
    opts || (opts = {});
    if (channel) return channel;
    // if we don't have one by this label, create it
    channel = this.channels[name] = this.pc.createDataChannel(name, opts);
    this._observeDataChannel(channel);
    return channel;
};

Peer.prototype.onIceCandidate = function (candidate) {
    if (this.closed) return;
    if (candidate) {
        var pcConfig = this.parent.config.peerConnectionConfig;
        if (webrtcSupport.prefix === 'moz' && pcConfig && pcConfig.iceTransports &&
                candidate.candidate && candidate.candidate.candidate &&
                candidate.candidate.candidate.indexOf(pcConfig.iceTransports) < 0) {
            this.logger.log('Ignoring ice candidate not matching pcConfig iceTransports type: ', pcConfig.iceTransports);
        } else {
            this.send('candidate', candidate);
        }
    } else {
        this.logger.log("End of candidates.");
    }
};

Peer.prototype.start = function () {
    var self = this;

    // well, the webrtc api requires that we either
    // a) create a datachannel a priori
    // b) do a renegotiation later to add the SCTP m-line
    // Let's do (a) first...
    if (this.enableDataChannels) {
        this.getDataChannel('simplewebrtc');
    }

    this.pc.offer(this.receiveMedia, function (err, sessionDescription) {
        //self.send('offer', sessionDescription);
    });
};

Peer.prototype.icerestart = function () {
    var constraints = this.receiveMedia;
    constraints.mandatory.IceRestart = true;
    this.pc.offer(constraints, function (err, success) { });
};

Peer.prototype.end = function () {
    if (this.closed) return;
    this.pc.close();
    this.handleStreamRemoved();
};

Peer.prototype.handleRemoteStreamAdded = function (event) {
    var self = this;
    if (this.stream) {
        this.logger.warn('Already have a remote stream');
    } else {
        this.stream = event.stream;

        this.stream.getTracks().forEach(function (track) {
            track.addEventListener('ended', function () {
                if (isAllTracksEnded(self.stream)) {
                    self.end();
                }
            });
        });

        this.parent.emit('peerStreamAdded', this);
    }
};

Peer.prototype.handleStreamRemoved = function () {
    var peerIndex = this.parent.peers.indexOf(this);
    if (peerIndex > -1) {
        this.parent.peers.splice(peerIndex, 1);
        this.closed = true;
        this.parent.emit('peerStreamRemoved', this);
    }
};

Peer.prototype.handleDataChannelAdded = function (channel) {
    this.channels[channel.label] = channel;
    this._observeDataChannel(channel);
};

Peer.prototype.sendFile = function (file) {
    var sender = new FileTransfer.Sender();
    var dc = this.getDataChannel('filetransfer' + (new Date()).getTime(), {
        protocol: INBAND_FILETRANSFER_V1
    });
    // override onopen
    dc.onopen = function () {
        dc.send(JSON.stringify({
            size: file.size,
            name: file.name
        }));
        sender.send(file, dc);
    };
    // override onclose
    dc.onclose = function () {
        console.log('sender received transfer');
        sender.emit('complete');
    };
    return sender;
};

module.exports = Peer;

},{"filetransfer":35,"rtcpeerconnection":53,"util":73,"webrtcsupport":74,"wildemitter":75}],78:[function(require,module,exports){
var WebRTC = require('./webrtc');
var WildEmitter = require('wildemitter');
var webrtcSupport = require('webrtcsupport');
var attachMediaStream = require('attachmediastream');
var mockconsole = require('mockconsole');
var SocketIoConnection = require('./socketioconnection');

function SimpleWebRTC(opts) {
    var self = this;
    var options = opts || {};
    var config = this.config = {
            url: 'https://sandbox.simplewebrtc.com:443/',
            socketio: {/* 'force new connection':true*/},
            connection: null,
            debug: false,
            localVideoEl: '',
            remoteVideosEl: '',
            enableDataChannels: true,
            autoRequestMedia: false,
            autoRemoveVideos: true,
            adjustPeerVolume: false,
            peerVolumeWhenSpeaking: 0.25,
            media: {
                video: true,
                audio: true
            },
            receiveMedia: {
                offerToReceiveAudio: 1,
                offerToReceiveVideo: 1
            },
            localVideo: {
                autoplay: true,
                mirror: true,
                muted: true
            }
        };
    var item, connection;

    // We also allow a 'logger' option. It can be any object that implements
    // log, warn, and error methods.
    // We log nothing by default, following "the rule of silence":
    // http://www.linfo.org/rule_of_silence.html
    this.logger = function () {
        // we assume that if you're in debug mode and you didn't
        // pass in a logger, you actually want to log as much as
        // possible.
        if (opts.debug) {
            return opts.logger || console;
        } else {
        // or we'll use your logger which should have its own logic
        // for output. Or we'll return the no-op.
            return opts.logger || mockconsole;
        }
    }();

    // set our config from options
    for (item in options) {
        if (options.hasOwnProperty(item)) {
            this.config[item] = options[item];
        }
    }

    // attach detected support for convenience
    this.capabilities = webrtcSupport;

    // call WildEmitter constructor
    WildEmitter.call(this);

    // create default SocketIoConnection if it's not passed in
    if (this.config.connection === null) {
        connection = this.connection = new SocketIoConnection(this.config);
    } else {
        connection = this.connection = this.config.connection;
    }

    connection.on('connect', function () {
        self.emit('connectionReady', connection.getSessionid());
        self.sessionReady = true;
        self.testReadiness();
    });

    connection.on('message', function (message) {
        var peers = self.webrtc.getPeers(message.from, message.roomType);
        var peer;

        if (message.type === 'offer') {
            if (peers.length) {
                peers.forEach(function (p) {
                    if (p.sid == message.sid) peer = p;
                });
                //if (!peer) peer = peers[0]; // fallback for old protocol versions
            }
            if (!peer) {
                peer = self.webrtc.createPeer({
                    id: message.from,
                    sid: message.sid,
                    type: message.roomType,
                    enableDataChannels: self.config.enableDataChannels && message.roomType !== 'screen',
                    sharemyscreen: message.roomType === 'screen' && !message.broadcaster,
                    broadcaster: message.roomType === 'screen' && !message.broadcaster ? self.connection.getSessionid() : null
                });
                self.emit('createdPeer', peer);
            }
            peer.handleMessage(message);
        } else if (peers.length) {
            peers.forEach(function (peer) {
                if (message.sid) {
                    if (peer.sid === message.sid) {
                        peer.handleMessage(message);
                    }
                } else {
                    peer.handleMessage(message);
                }
            });
        }
    });

    connection.on('remove', function (room) {
        if (room.id !== self.connection.getSessionid()) {
            self.webrtc.removePeers(room.id, room.type);
        }
    });

    // instantiate our main WebRTC helper
    // using same logger from logic here
    opts.logger = this.logger;
    opts.debug = false;
    this.webrtc = new WebRTC(opts);

    // attach a few methods from underlying lib to simple.
    ['mute', 'unmute', 'pauseVideo', 'resumeVideo', 'pause', 'resume', 'sendToAll', 'sendDirectlyToAll', 'getPeers'].forEach(function (method) {
        self[method] = self.webrtc[method].bind(self.webrtc);
    });

    // proxy events from WebRTC
    this.webrtc.on('*', function () {
        self.emit.apply(self, arguments);
    });

    // log all events in debug mode
    if (config.debug) {
        this.on('*', this.logger.log.bind(this.logger, 'SimpleWebRTC event:'));
    }

    // check for readiness
    this.webrtc.on('localStream', function () {
        self.testReadiness();
    });

    this.webrtc.on('message', function (payload) {
        self.connection.emit('message', payload);
    });

    this.webrtc.on('peerStreamAdded', this.handlePeerStreamAdded.bind(this));
    this.webrtc.on('peerStreamRemoved', this.handlePeerStreamRemoved.bind(this));

    // echo cancellation attempts
    if (this.config.adjustPeerVolume) {
        this.webrtc.on('speaking', this.setVolumeForAll.bind(this, this.config.peerVolumeWhenSpeaking));
        this.webrtc.on('stoppedSpeaking', this.setVolumeForAll.bind(this, 1));
    }

    connection.on('stunservers', function (args) {
        // resets/overrides the config
        self.webrtc.config.peerConnectionConfig.iceServers = args;
        self.emit('stunservers', args);
    });
    connection.on('turnservers', function (args) {
        // appends to the config
        self.webrtc.config.peerConnectionConfig.iceServers = self.webrtc.config.peerConnectionConfig.iceServers.concat(args);
        self.emit('turnservers', args);
    });

    this.webrtc.on('iceFailed', function (peer) {
        // local ice failure
    });
    this.webrtc.on('connectivityError', function (peer) {
        // remote ice failure
    });


    // sending mute/unmute to all peers
    this.webrtc.on('audioOn', function () {
        self.webrtc.sendToAll('unmute', {name: 'audio'});
    });
    this.webrtc.on('audioOff', function () {
        self.webrtc.sendToAll('mute', {name: 'audio'});
    });
    this.webrtc.on('videoOn', function () {
        self.webrtc.sendToAll('unmute', {name: 'video'});
    });
    this.webrtc.on('videoOff', function () {
        self.webrtc.sendToAll('mute', {name: 'video'});
    });

    // screensharing events
    this.webrtc.on('localScreen', function (stream) {
        var item,
            el = document.createElement('video'),
            container = self.getRemoteVideoContainer();

        el.oncontextmenu = function () { return false; };
        el.id = 'localScreen';
        attachMediaStream(stream, el);
        if (container) {
            container.appendChild(el);
        }

        self.emit('localScreenAdded', el);
        self.connection.emit('shareScreen');

        self.webrtc.peers.forEach(function (existingPeer) {
            var peer;
            if (existingPeer.type === 'video') {
                peer = self.webrtc.createPeer({
                    id: existingPeer.id,
                    type: 'screen',
                    sharemyscreen: true,
                    enableDataChannels: false,
                    receiveMedia: {
                        offerToReceiveAudio: 0,
                        offerToReceiveVideo: 0
                    },
                    broadcaster: self.connection.getSessionid(),
                });
                self.emit('createdPeer', peer);
                peer.start();
            }
        });
    });
    this.webrtc.on('localScreenStopped', function (stream) {
        if (self.getLocalScreen()) {
            self.stopScreenShare();
        }
        /*
        self.connection.emit('unshareScreen');
        self.webrtc.peers.forEach(function (peer) {
            if (peer.sharemyscreen) {
                peer.end();
            }
        });
        */
    });

    this.webrtc.on('channelMessage', function (peer, label, data) {
        if (data.type == 'volume') {
            self.emit('remoteVolumeChange', peer, data.volume);
        }
    });

    if (this.config.autoRequestMedia) this.startLocalVideo();
}


SimpleWebRTC.prototype = Object.create(WildEmitter.prototype, {
    constructor: {
        value: SimpleWebRTC
    }
});

SimpleWebRTC.prototype.leaveRoom = function () {
    if (this.roomName) {
        this.connection.emit('leave');
        while (this.webrtc.peers.length) {
            this.webrtc.peers[0].end();
        }
        if (this.getLocalScreen()) {
            this.stopScreenShare();
        }
        this.emit('leftRoom', this.roomName);
        this.roomName = undefined;
    }
};

SimpleWebRTC.prototype.disconnect = function () {
    this.connection.disconnect();
    delete this.connection;
};

SimpleWebRTC.prototype.handlePeerStreamAdded = function (peer) {
    var self = this;
    var container = this.getRemoteVideoContainer();
    var video = attachMediaStream(peer.stream);

    // store video element as part of peer for easy removal
    peer.videoEl = video;
    video.id = this.getDomId(peer);

    if (container) container.appendChild(video);

    this.emit('videoAdded', video, peer);

    // send our mute status to new peer if we're muted
    // currently called with a small delay because it arrives before
    // the video element is created otherwise (which happens after
    // the async setRemoteDescription-createAnswer)
    window.setTimeout(function () {
        if (!self.webrtc.isAudioEnabled()) {
            peer.send('mute', {name: 'audio'});
        }
        if (!self.webrtc.isVideoEnabled()) {
            peer.send('mute', {name: 'video'});
        }
    }, 250);
};

SimpleWebRTC.prototype.handlePeerStreamRemoved = function (peer) {
    var container = this.getRemoteVideoContainer();
    var videoEl = peer.videoEl;
    if (this.config.autoRemoveVideos && container && videoEl) {
        container.removeChild(videoEl);
    }
    if (videoEl) this.emit('videoRemoved', videoEl, peer);
};

SimpleWebRTC.prototype.getDomId = function (peer) {
    return [peer.id, peer.type, peer.broadcaster ? 'broadcasting' : 'incoming'].join('_');
};

// set volume on video tag for all peers takse a value between 0 and 1
SimpleWebRTC.prototype.setVolumeForAll = function (volume) {
    this.webrtc.peers.forEach(function (peer) {
        if (peer.videoEl) peer.videoEl.volume = volume;
    });
};

SimpleWebRTC.prototype.joinRoom = function (name, cb) {
    var self = this;
    this.roomName = name;
    this.connection.emit('join', name, function (err, roomDescription) {
        console.log('join CB', err, roomDescription);
        if (err) {
            self.emit('error', err);
        } else {
            var id,
                client,
                type,
                peer;
            for (id in roomDescription.clients) {
                client = roomDescription.clients[id];
                for (type in client) {
                    if (client[type]) {
                        peer = self.webrtc.createPeer({
                            id: id,
                            type: type,
                            enableDataChannels: self.config.enableDataChannels && type !== 'screen',
                            receiveMedia: {
                                offerToReceiveAudio: type !== 'screen' && self.config.receiveMedia.offerToReceiveAudio ? 1 : 0,
                                offerToReceiveVideo: self.config.receiveMedia.offerToReceiveVideo
                            }
                        });
                        self.emit('createdPeer', peer);
                        peer.start();
                    }
                }
            }
        }

        if (cb) cb(err, roomDescription);
        self.emit('joinedRoom', name);
    });
};

SimpleWebRTC.prototype.getEl = function (idOrEl) {
    if (typeof idOrEl === 'string') {
        return document.getElementById(idOrEl);
    } else {
        return idOrEl;
    }
};

SimpleWebRTC.prototype.startLocalVideo = function () {
    var self = this;
    this.webrtc.start(this.config.media, function (err, stream) {
        if (err) {
            self.emit('localMediaError', err);
        } else {
            attachMediaStream(stream, self.getLocalVideoContainer(), self.config.localVideo);
        }
    });
};

SimpleWebRTC.prototype.stopLocalVideo = function () {
    this.webrtc.stop();
};

// this accepts either element ID or element
// and either the video tag itself or a container
// that will be used to put the video tag into.
SimpleWebRTC.prototype.getLocalVideoContainer = function () {
    var el = this.getEl(this.config.localVideoEl);
    if (el && el.tagName === 'VIDEO') {
        el.oncontextmenu = function () { return false; };
        return el;
    } else if (el) {
        var video = document.createElement('video');
        video.oncontextmenu = function () { return false; };
        el.appendChild(video);
        return video;
    } else {
        return;
    }
};

SimpleWebRTC.prototype.getRemoteVideoContainer = function () {
    return this.getEl(this.config.remoteVideosEl);
};

SimpleWebRTC.prototype.shareScreen = function (cb) {
    this.webrtc.startScreenShare(cb);
};

SimpleWebRTC.prototype.getLocalScreen = function () {
    return this.webrtc.localScreens && this.webrtc.localScreens[0];
};

SimpleWebRTC.prototype.stopScreenShare = function () {
    this.connection.emit('unshareScreen');
    var videoEl = document.getElementById('localScreen');
    var container = this.getRemoteVideoContainer();

    if (this.config.autoRemoveVideos && container && videoEl) {
        container.removeChild(videoEl);
    }

    // a hack to emit the event the removes the video
    // element that we want
    if (videoEl) {
        this.emit('videoRemoved', videoEl);
    }
    if (this.getLocalScreen()) {
        this.webrtc.stopScreenShare();
    }
    this.webrtc.peers.forEach(function (peer) {
        if (peer.broadcaster) {
            peer.end();
        }
    });
};

SimpleWebRTC.prototype.testReadiness = function () {
    var self = this;
    if (this.sessionReady) {
        if (!this.config.media.video && !this.config.media.audio) {
            self.emit('readyToCall', self.connection.getSessionid());
        } else if (this.webrtc.localStreams.length > 0) {
            self.emit('readyToCall', self.connection.getSessionid());
        }
    }
};

SimpleWebRTC.prototype.createRoom = function (name, cb) {
    this.roomName = name;
    if (arguments.length === 2) {
        this.connection.emit('create', name, cb);
    } else {
        this.connection.emit('create', name);
    }
};

SimpleWebRTC.prototype.sendFile = function () {
    if (!webrtcSupport.dataChannel) {
        return this.emit('error', new Error('DataChannelNotSupported'));
    }

};

module.exports = SimpleWebRTC;

},{"./socketioconnection":79,"./webrtc":80,"attachmediastream":3,"mockconsole":46,"webrtcsupport":74,"wildemitter":75}],79:[function(require,module,exports){
var io = require('socket.io-client');

function SocketIoConnection(config) {
    this.connection = io.connect(config.url, config.socketio);
}

SocketIoConnection.prototype.on = function (ev, fn) {
    this.connection.on(ev, fn);
};

SocketIoConnection.prototype.emit = function () {
    this.connection.emit.apply(this.connection, arguments);
};

SocketIoConnection.prototype.getSessionid = function () {
    return this.connection.id;
};

SocketIoConnection.prototype.disconnect = function () {
    return this.connection.disconnect();
};

module.exports = SocketIoConnection;

},{"socket.io-client":60}],80:[function(require,module,exports){
var util = require('util');
var webrtcSupport = require('webrtcsupport');
var mockconsole = require('mockconsole');
var localMedia = require('localmedia');
var Peer = require('./peer');

function WebRTC(opts) {
    var self = this;
    var options = opts || {};
    var config = this.config = {
            debug: false,
            // makes the entire PC config overridable
            peerConnectionConfig: {
                iceServers: [{'urls': 'stun:stun.l.google.com:19302'}]
            },
            peerConnectionConstraints: {
                optional: []
            },
            receiveMedia: {
                offerToReceiveAudio: 1,
                offerToReceiveVideo: 1
            },
            enableDataChannels: true
        };
    var item;

    // We also allow a 'logger' option. It can be any object that implements
    // log, warn, and error methods.
    // We log nothing by default, following "the rule of silence":
    // http://www.linfo.org/rule_of_silence.html
    this.logger = function () {
        // we assume that if you're in debug mode and you didn't
        // pass in a logger, you actually want to log as much as
        // possible.
        if (opts.debug) {
            return opts.logger || console;
        } else {
        // or we'll use your logger which should have its own logic
        // for output. Or we'll return the no-op.
            return opts.logger || mockconsole;
        }
    }();

    // set options
    for (item in options) {
        if (options.hasOwnProperty(item)) {
            this.config[item] = options[item];
        }
    }

    // check for support
    if (!webrtcSupport.support) {
        this.logger.error('Your browser doesn\'t seem to support WebRTC');
    }

    // where we'll store our peer connections
    this.peers = [];

    // call localMedia constructor
    localMedia.call(this, this.config);

    this.on('speaking', function () {
        if (!self.hardMuted) {
            // FIXME: should use sendDirectlyToAll, but currently has different semantics wrt payload
            self.peers.forEach(function (peer) {
                if (peer.enableDataChannels) {
                    var dc = peer.getDataChannel('hark');
                    if (dc.readyState != 'open') return;
                    dc.send(JSON.stringify({type: 'speaking'}));
                }
            });
        }
    });
    this.on('stoppedSpeaking', function () {
        if (!self.hardMuted) {
            // FIXME: should use sendDirectlyToAll, but currently has different semantics wrt payload
            self.peers.forEach(function (peer) {
                if (peer.enableDataChannels) {
                    var dc = peer.getDataChannel('hark');
                    if (dc.readyState != 'open') return;
                    dc.send(JSON.stringify({type: 'stoppedSpeaking'}));
                }
            });
        }
    });
    this.on('volumeChange', function (volume, treshold) {
        if (!self.hardMuted) {
            // FIXME: should use sendDirectlyToAll, but currently has different semantics wrt payload
            self.peers.forEach(function (peer) {
                if (peer.enableDataChannels) {
                    var dc = peer.getDataChannel('hark');
                    if (dc.readyState != 'open') return;
                    dc.send(JSON.stringify({type: 'volume', volume: volume }));
                }
            });
        }
    });

    // log events in debug mode
    if (this.config.debug) {
        this.on('*', function (event, val1, val2) {
            var logger;
            // if you didn't pass in a logger and you explicitly turning on debug
            // we're just going to assume you're wanting log output with console
            if (self.config.logger === mockconsole) {
                logger = console;
            } else {
                logger = self.logger;
            }
            logger.log('event:', event, val1, val2);
        });
    }
}

util.inherits(WebRTC, localMedia);

WebRTC.prototype.createPeer = function (opts) {
    var peer;
    opts.parent = this;
    peer = new Peer(opts);
    this.peers.push(peer);
    return peer;
};

// removes peers
WebRTC.prototype.removePeers = function (id, type) {
    this.getPeers(id, type).forEach(function (peer) {
        peer.end();
    });
};

// fetches all Peer objects by session id and/or type
WebRTC.prototype.getPeers = function (sessionId, type) {
    return this.peers.filter(function (peer) {
        return (!sessionId || peer.id === sessionId) && (!type || peer.type === type);
    });
};

// sends message to all
WebRTC.prototype.sendToAll = function (message, payload) {
    this.peers.forEach(function (peer) {
        peer.send(message, payload);
    });
};

// sends message to all using a datachannel
// only sends to anyone who has an open datachannel
WebRTC.prototype.sendDirectlyToAll = function (channel, message, payload) {
    this.peers.forEach(function (peer) {
        if (peer.enableDataChannels) {
            peer.sendDirectly(channel, message, payload);
        }
    });
};

module.exports = WebRTC;

},{"./peer":77,"localmedia":44,"mockconsole":46,"util":73,"webrtcsupport":74}]},{},[78])(78)
});