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expose MidiFile.readEvent() to parse the event from midi input device #18

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expose MidiFile.readEvent() to parse the event from midi input device #18

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95 changes: 51 additions & 44 deletions midifile.js
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Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ function MidiFile(data) {
(stream.readInt8() << 16)
+ (stream.readInt8() << 8)
+ stream.readInt8()
)
);
return event;
case 0x54:
event.subtype = 'smpteOffset';
Expand Down Expand Up @@ -111,7 +111,7 @@ function MidiFile(data) {
return event;
default:
// console.log("Unrecognised meta event subtype: " + subtypeByte);
event.subtype = 'unknown'
event.subtype = 'unknown';
event.data = stream.read(length);
return event;
}
Expand Down Expand Up @@ -184,7 +184,7 @@ function MidiFile(data) {
event.value = param1 + (stream.readInt8() << 7);
return event;
default:
throw "Unrecognised MIDI event type: " + eventType
throw "Unrecognised MIDI event type: " + eventType;
/*
console.log("Unrecognised MIDI event type: " + eventType);
stream.readInt8();
Expand All @@ -194,45 +194,52 @@ function MidiFile(data) {
}
}
}

stream = Stream(data);
var headerChunk = readChunk(stream);
if (headerChunk.id != 'MThd' || headerChunk.length != 6) {
throw "Bad .mid file - header not found";
}
var headerStream = Stream(headerChunk.data);
var formatType = headerStream.readInt16();
var trackCount = headerStream.readInt16();
var timeDivision = headerStream.readInt16();

if (timeDivision & 0x8000) {
throw "Expressing time division in SMTPE frames is not supported yet"
} else {
ticksPerBeat = timeDivision;
}

var header = {
'formatType': formatType,
'trackCount': trackCount,
'ticksPerBeat': ticksPerBeat
}
var tracks = [];
for (var i = 0; i < header.trackCount; i++) {
tracks[i] = [];
var trackChunk = readChunk(stream);
if (trackChunk.id != 'MTrk') {
throw "Unexpected chunk - expected MTrk, got "+ trackChunk.id;
}
var trackStream = Stream(trackChunk.data);
while (!trackStream.eof()) {
var event = readEvent(trackStream);
tracks[i].push(event);
//console.log(event);
}
}

return {
'header': header,
'tracks': tracks
}

if(typeof data !== 'undefined') {
stream = Stream(data);
var headerChunk = readChunk(stream);
if (headerChunk.id != 'MThd' || headerChunk.length != 6) {
throw "Bad .mid file - header not found";
}
var headerStream = Stream(headerChunk.data);
var formatType = headerStream.readInt16();
var trackCount = headerStream.readInt16();
var timeDivision = headerStream.readInt16();

if (timeDivision & 0x8000) {
throw "Expressing time division in SMTPE frames is not supported yet"
} else {
ticksPerBeat = timeDivision;
}

var header = {
'formatType': formatType,
'trackCount': trackCount,
'ticksPerBeat': ticksPerBeat
};
var tracks = [];
for (var i = 0; i < header.trackCount; i++) {
tracks[i] = [];
var trackChunk = readChunk(stream);
if (trackChunk.id != 'MTrk') {
throw "Unexpected chunk - expected MTrk, got "+ trackChunk.id;
}
var trackStream = Stream(trackChunk.data);
while (!trackStream.eof()) {
var event = readEvent(trackStream);
tracks[i].push(event);
//console.log(event);
}
}

return {
'header': header,
'tracks': tracks
};
}

return { // public static methods
readEvent: readEvent
};

}