Fix issue with rejecting non-matching FMTP (#67)

LVala · web-flow · commit 4095ede905e6 · 2024-02-06T21:57:43.000+01:00
diff --git a/examples/echo/README.md b/examples/echo/README.md
@@ -6,4 +6,4 @@ While in `examples/echo` directory
 
 1. Run `mix deps.get`
 2. Run `mix run --no-halt`
-3. Visit `http://127.0.0.1:8829` in your browser and press the `play` button.
+3. Visit `http://127.0.0.1:8829/index.html` in your browser and press the `play` button.
diff --git a/examples/echo/lib/echo/peer_handler.ex b/examples/echo/lib/echo/peer_handler.ex
@@ -19,10 +19,7 @@ defmodule Echo.PeerHandler do
     %RTPCodecParameters{
       payload_type: 96,
       mime_type: "video/VP8",
-      clock_rate: 90_000,
-      channels: nil,
-      sdp_fmtp_line: nil,
-      rtcp_fbs: []
+      clock_rate: 90_000
     }
   ]
 
@@ -31,8 +28,7 @@ defmodule Echo.PeerHandler do
       payload_type: 111,
       mime_type: "audio/opus",
       clock_rate: 48_000,
-      channels: 2,
-      sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}
+      channels: 2
     }
   ]
 
diff --git a/examples/echo/lib/echo/router.ex b/examples/echo/lib/echo/router.ex
@@ -1,19 +1,10 @@
 defmodule Echo.Router do
   use Plug.Router
 
-  @assets "assets"
-
+  plug(Plug.Static, at: "/", from: "assets")
   plug(:match)
   plug(:dispatch)
 
-  get "/" do
-    send_file(conn, 200, "#{@assets}/index.html")
-  end
-
-  get "/script.js" do
-    send_file(conn, 200, "#{@assets}/script.js")
-  end
-
   get "/ws" do
     WebSockAdapter.upgrade(conn, Echo.PeerHandler, %{}, [])
   end
diff --git a/examples/echo/mix.lock b/examples/echo/mix.lock
@@ -8,7 +8,7 @@
   "elixir_make": {:hex, :elixir_make, "0.7.8", "505026f266552ee5aabca0b9f9c229cbb496c689537c9f922f3eb5431157efc7", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.0", [hex: :certifi, repo: "hexpm", optional: true]}], "hexpm", "7a71945b913d37ea89b06966e1342c85cfe549b15e6d6d081e8081c493062c07"},
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.1", "dce506597acb7e6b0daeaff52ff6a9043f5919a4c3315abb4143f0b00378c097", [:mix], [], "hexpm", "f7eba2ea6c3555cea09706492716b0d87397b88946e6380898c2889d68585752"},
   "ex_dtls": {:hex, :ex_dtls, "0.15.0", "71a11b0379f4ebeb781548ead0e72194e650cfb6d6c435015c8b36e9e5574f62", [:mix], [{:unifex, "~> 1.0", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "3ff1d9ef6c4b0cc800105979c1c58dc67cada91c593beeae56e05094fdbce865"},
-  "ex_ice": {:hex, :ex_ice, "0.5.0", "8e380afb611b4d48a74d4a8016a0284ed11c77400230e2840e2476856cf6d572", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "d5a9d5d4b54650385a9b5365b38d919d5158ab2fec5c13669ae45db494516bb6"},
+  "ex_ice": {:hex, :ex_ice, "0.6.0", "7deb747f3813501a34b1103a8243981beed07767512d2b7007ee2c61e43b5f83", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "743917f921c26f12c13a096e93299b7a61bda0a6a44fe202e6fc5d0e2d5154af"},
   "ex_libsrtp": {:hex, :ex_libsrtp, "0.7.2", "211bd89c08026943ce71f3e2c0231795b99cee748808ed3ae7b97cd8d2450b6b", [:mix], [{:bunch, "~> 1.6", [hex: :bunch, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.3", [hex: :bundlex, repo: "hexpm", optional: false]}, {:membrane_precompiled_dependency_provider, "~> 0.1.0", [hex: :membrane_precompiled_dependency_provider, repo: "hexpm", optional: false]}, {:unifex, "~> 1.1", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "2e20645d0d739a4ecdcf8d4810a0c198120c8a2f617f2b75b2e2e704d59f492a"},
   "ex_rtcp": {:hex, :ex_rtcp, "0.1.0", "2e02d23fc6ccc7e00aed13358ffdbcb23e34d3a7f35c66cadaa54447383ecae4", [:mix], [], "hexpm", "1c9a7e636f3950fbcefedce31f3e4ca60b84ea80ad519789f9d215167c60cb2b"},
   "ex_rtp": {:hex, :ex_rtp, "0.3.0", "d18d0de39875958902816284f79c8cd51ec83d39bdd14edf6a5b069926268a43", [:mix], [], "hexpm", "cec8398237095b02438842cfc74487c3cbaeb7fe29e4c62ae11457a0ddd99754"},
diff --git a/examples/save_to_file/README.md b/examples/save_to_file/README.md
@@ -6,7 +6,7 @@ While in `examples/save_to_file` directory
 
 1. Run `mix deps.get`
 2. Run `mix run --no-halt`
-3. Visit `http://127.0.0.1:8829` in your browser.
+3. Visit `http://127.0.0.1:8829/index.html` in your browser.
 4. Press the `Start` button to start recording.
 5. Press the `Stop` button to stop recording.
 
diff --git a/examples/save_to_file/lib/save_to_file/peer_handler.ex b/examples/save_to_file/lib/save_to_file/peer_handler.ex
@@ -25,10 +25,7 @@ defmodule SaveToFile.PeerHandler do
     %RTPCodecParameters{
       payload_type: 96,
       mime_type: "video/VP8",
-      clock_rate: 90_000,
-      channels: nil,
-      sdp_fmtp_line: nil,
-      rtcp_fbs: []
+      clock_rate: 90_000
     }
   ]
 
@@ -37,8 +34,7 @@ defmodule SaveToFile.PeerHandler do
       payload_type: 111,
       mime_type: "audio/opus",
       clock_rate: 48_000,
-      channels: 2,
-      sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}
+      channels: 2
     }
   ]
 
diff --git a/examples/save_to_file/lib/save_to_file/router.ex b/examples/save_to_file/lib/save_to_file/router.ex
@@ -1,19 +1,10 @@
 defmodule SaveToFile.Router do
   use Plug.Router
 
-  @assets "assets"
-
+  plug(Plug.Static, at: "/", from: "assets")
   plug(:match)
   plug(:dispatch)
 
-  get "/" do
-    send_file(conn, 200, "#{@assets}/index.html")
-  end
-
-  get "/script.js" do
-    send_file(conn, 200, "#{@assets}/script.js")
-  end
-
   get "/ws" do
     WebSockAdapter.upgrade(conn, SaveToFile.PeerHandler, %{}, [])
   end
diff --git a/examples/save_to_file/mix.lock b/examples/save_to_file/mix.lock
@@ -8,7 +8,7 @@
   "elixir_make": {:hex, :elixir_make, "0.7.8", "505026f266552ee5aabca0b9f9c229cbb496c689537c9f922f3eb5431157efc7", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.0", [hex: :certifi, repo: "hexpm", optional: true]}], "hexpm", "7a71945b913d37ea89b06966e1342c85cfe549b15e6d6d081e8081c493062c07"},
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.1", "dce506597acb7e6b0daeaff52ff6a9043f5919a4c3315abb4143f0b00378c097", [:mix], [], "hexpm", "f7eba2ea6c3555cea09706492716b0d87397b88946e6380898c2889d68585752"},
   "ex_dtls": {:hex, :ex_dtls, "0.15.0", "71a11b0379f4ebeb781548ead0e72194e650cfb6d6c435015c8b36e9e5574f62", [:mix], [{:unifex, "~> 1.0", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "3ff1d9ef6c4b0cc800105979c1c58dc67cada91c593beeae56e05094fdbce865"},
-  "ex_ice": {:hex, :ex_ice, "0.5.0", "8e380afb611b4d48a74d4a8016a0284ed11c77400230e2840e2476856cf6d572", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "d5a9d5d4b54650385a9b5365b38d919d5158ab2fec5c13669ae45db494516bb6"},
+  "ex_ice": {:hex, :ex_ice, "0.6.0", "7deb747f3813501a34b1103a8243981beed07767512d2b7007ee2c61e43b5f83", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "743917f921c26f12c13a096e93299b7a61bda0a6a44fe202e6fc5d0e2d5154af"},
   "ex_libsrtp": {:hex, :ex_libsrtp, "0.7.2", "211bd89c08026943ce71f3e2c0231795b99cee748808ed3ae7b97cd8d2450b6b", [:mix], [{:bunch, "~> 1.6", [hex: :bunch, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.3", [hex: :bundlex, repo: "hexpm", optional: false]}, {:membrane_precompiled_dependency_provider, "~> 0.1.0", [hex: :membrane_precompiled_dependency_provider, repo: "hexpm", optional: false]}, {:unifex, "~> 1.1", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "2e20645d0d739a4ecdcf8d4810a0c198120c8a2f617f2b75b2e2e704d59f492a"},
   "ex_rtcp": {:hex, :ex_rtcp, "0.1.0", "2e02d23fc6ccc7e00aed13358ffdbcb23e34d3a7f35c66cadaa54447383ecae4", [:mix], [], "hexpm", "1c9a7e636f3950fbcefedce31f3e4ca60b84ea80ad519789f9d215167c60cb2b"},
   "ex_rtp": {:hex, :ex_rtp, "0.3.0", "d18d0de39875958902816284f79c8cd51ec83d39bdd14edf6a5b069926268a43", [:mix], [], "hexpm", "cec8398237095b02438842cfc74487c3cbaeb7fe29e4c62ae11457a0ddd99754"},
diff --git a/examples/send_from_file/README.md b/examples/send_from_file/README.md
@@ -17,6 +17,6 @@ You may use your own files, if they meet the requirements:
 
 2. Run `mix deps.get`
 3. Run `mix run --no-halt`
-4. Visit `http://127.0.0.1:8829` in your browser and press the `play` button.
+4. Visit `http://127.0.0.1:8829/index.html` in your browser and press the `play` button.
 
 The video and audio will loop infinitely.
diff --git a/examples/send_from_file/lib/send_from_file/peer_handler.ex b/examples/send_from_file/lib/send_from_file/peer_handler.ex
@@ -29,10 +29,7 @@ defmodule SendFromFile.PeerHandler do
     %RTPCodecParameters{
       payload_type: 96,
       mime_type: "video/VP8",
-      clock_rate: 90_000,
-      channels: nil,
-      sdp_fmtp_line: nil,
-      rtcp_fbs: []
+      clock_rate: 90_000
     }
   ]
 
@@ -41,8 +38,7 @@ defmodule SendFromFile.PeerHandler do
       payload_type: 111,
       mime_type: "audio/opus",
       clock_rate: 48_000,
-      channels: 2,
-      sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}
+      channels: 2
     }
   ]
 
diff --git a/examples/send_from_file/lib/send_from_file/router.ex b/examples/send_from_file/lib/send_from_file/router.ex
@@ -1,19 +1,10 @@
 defmodule SendFromFile.Router do
   use Plug.Router
 
-  @assets "assets"
-
+  plug(Plug.Static, at: "/", from: "assets")
   plug(:match)
   plug(:dispatch)
 
-  get "/" do
-    send_file(conn, 200, "#{@assets}/index.html")
-  end
-
-  get "/script.js" do
-    send_file(conn, 200, "#{@assets}/script.js")
-  end
-
   get "/ws" do
     WebSockAdapter.upgrade(conn, SendFromFile.PeerHandler, %{}, [])
   end
diff --git a/examples/send_from_file/mix.lock b/examples/send_from_file/mix.lock
@@ -8,7 +8,7 @@
   "elixir_make": {:hex, :elixir_make, "0.7.8", "505026f266552ee5aabca0b9f9c229cbb496c689537c9f922f3eb5431157efc7", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.0", [hex: :certifi, repo: "hexpm", optional: true]}], "hexpm", "7a71945b913d37ea89b06966e1342c85cfe549b15e6d6d081e8081c493062c07"},
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.1", "dce506597acb7e6b0daeaff52ff6a9043f5919a4c3315abb4143f0b00378c097", [:mix], [], "hexpm", "f7eba2ea6c3555cea09706492716b0d87397b88946e6380898c2889d68585752"},
   "ex_dtls": {:hex, :ex_dtls, "0.15.0", "71a11b0379f4ebeb781548ead0e72194e650cfb6d6c435015c8b36e9e5574f62", [:mix], [{:unifex, "~> 1.0", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "3ff1d9ef6c4b0cc800105979c1c58dc67cada91c593beeae56e05094fdbce865"},
-  "ex_ice": {:hex, :ex_ice, "0.5.0", "8e380afb611b4d48a74d4a8016a0284ed11c77400230e2840e2476856cf6d572", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "d5a9d5d4b54650385a9b5365b38d919d5158ab2fec5c13669ae45db494516bb6"},
+  "ex_ice": {:hex, :ex_ice, "0.6.0", "7deb747f3813501a34b1103a8243981beed07767512d2b7007ee2c61e43b5f83", [:mix], [{:ex_stun, "~> 0.1.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "743917f921c26f12c13a096e93299b7a61bda0a6a44fe202e6fc5d0e2d5154af"},
   "ex_libsrtp": {:hex, :ex_libsrtp, "0.7.2", "211bd89c08026943ce71f3e2c0231795b99cee748808ed3ae7b97cd8d2450b6b", [:mix], [{:bunch, "~> 1.6", [hex: :bunch, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.3", [hex: :bundlex, repo: "hexpm", optional: false]}, {:membrane_precompiled_dependency_provider, "~> 0.1.0", [hex: :membrane_precompiled_dependency_provider, repo: "hexpm", optional: false]}, {:unifex, "~> 1.1", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "2e20645d0d739a4ecdcf8d4810a0c198120c8a2f617f2b75b2e2e704d59f492a"},
   "ex_rtcp": {:hex, :ex_rtcp, "0.1.0", "2e02d23fc6ccc7e00aed13358ffdbcb23e34d3a7f35c66cadaa54447383ecae4", [:mix], [], "hexpm", "1c9a7e636f3950fbcefedce31f3e4ca60b84ea80ad519789f9d215167c60cb2b"},
   "ex_rtp": {:hex, :ex_rtp, "0.3.0", "d18d0de39875958902816284f79c8cd51ec83d39bdd14edf6a5b069926268a43", [:mix], [], "hexpm", "cec8398237095b02438842cfc74487c3cbaeb7fe29e4c62ae11457a0ddd99754"},
diff --git a/lib/ex_webrtc/peer_connection/configuration.ex b/lib/ex_webrtc/peer_connection/configuration.ex
@@ -162,8 +162,9 @@ defmodule ExWebRTC.PeerConnection.Configuration do
     # This function doesn't check if rtcp-fb is supported.
     # Instead, `supported_rtcp_fb?` has to be used to filter out
     # rtcp-fb that are not supported.
+    # TODO: this function doesn't compare fmtp at all
     Enum.any?(config.audio_codecs ++ config.video_codecs, fn supported_codec ->
-      %{supported_codec | rtcp_fbs: codec.rtcp_fbs} == codec
+      %{supported_codec | rtcp_fbs: codec.rtcp_fbs, sdp_fmtp_line: codec.sdp_fmtp_line} == codec
     end)
   end
 
@@ -228,90 +229,56 @@ defmodule ExWebRTC.PeerConnection.Configuration do
     {audio_codecs, video_codecs}
   end
 
-  defp update_codecs(
-         [%{mime_type: "audio/" <> _} = codec | sdp_codecs],
-         audio_codecs,
-         video_codecs
-       ) do
-    audio_codec =
-      audio_codecs
-      |> Stream.with_index()
-      |> Enum.find(fn {audio_codec, _idx} ->
-        # For the time of comparision, assume the same payload type and rtcp_fbs.
+  defp update_codecs([sdp_codec | sdp_codecs], audio_codecs, video_codecs) do
+    type =
+      case sdp_codec.mime_type do
+        "audio/" <> _ -> :audio
+        "video/" <> _ -> :video
+      end
+
+    codecs = if type == :audio, do: audio_codecs, else: video_codecs
+
+    codec =
+      codecs
+      |> Enum.with_index()
+      |> Enum.find(fn {codec, _idx} ->
+        # For the time of comparision, assume the same payload type and rtcp_fbs and fmtp.
         # We don't want to take into account rtcp_fbs as they can be negotiated
         # i.e. we can reject those that are not supported by us.
-        fmtp =
-          if audio_codec.sdp_fmtp_line != nil and codec.sdp_fmtp_line != nil do
-            %FMTP{audio_codec.sdp_fmtp_line | pt: codec.payload_type}
-          else
-            audio_codec.sdp_fmtp_line
-          end
-
-        audio_codec = %RTPCodecParameters{
-          audio_codec
-          | payload_type: codec.payload_type,
-            sdp_fmtp_line: fmtp,
-            rtcp_fbs: codec.rtcp_fbs
+        codec = %RTPCodecParameters{
+          codec
+          | payload_type: sdp_codec.payload_type,
+            sdp_fmtp_line: sdp_codec.sdp_fmtp_line,
+            rtcp_fbs: sdp_codec.rtcp_fbs
         }
 
-        audio_codec == codec
+        codec == sdp_codec
       end)
 
-    case audio_codec do
+    case codec do
       nil ->
         update_codecs(sdp_codecs, audio_codecs, video_codecs)
 
-      {audio_codec, idx} ->
-        audio_codec = %RTPCodecParameters{
-          audio_codec
-          | payload_type: codec.payload_type,
-            sdp_fmtp_line: codec.sdp_fmtp_line
-        }
-
-        audio_codecs = List.insert_at(audio_codecs, idx, audio_codec)
-        update_codecs(sdp_codecs, audio_codecs, video_codecs)
-    end
-  end
-
-  defp update_codecs(
-         [%{mime_type: "video/" <> _} = codec | sdp_codecs],
-         audio_codecs,
-         video_codecs
-       ) do
-    video_codec =
-      video_codecs
-      |> Stream.with_index()
-      |> Enum.find(fn {video_codec, _idx} ->
+      {codec, idx} ->
         fmtp =
-          if video_codec.sdp_fmtp_line != nil and codec.sdp_fmtp_line != nil do
-            %FMTP{video_codec.sdp_fmtp_line | pt: codec.payload_type}
+          if codec.sdp_fmtp_line != nil do
+            %{codec.sdp_fmtp_line | pt: sdp_codec.payload_type}
           else
-            video_codec.sdp_fmtp_line
+            nil
           end
 
-        video_codec = %RTPCodecParameters{
-          video_codec
-          | payload_type: codec.payload_type,
-            sdp_fmtp_line: fmtp,
-            rtcp_fbs: codec.rtcp_fbs
+        codec = %RTPCodecParameters{
+          codec
+          | payload_type: sdp_codec.payload_type,
+            sdp_fmtp_line: fmtp
         }
 
-        video_codec == codec
-      end)
-
-    case video_codec do
-      nil ->
-        update_codecs(sdp_codecs, audio_codecs, video_codecs)
-
-      {video_codec, idx} ->
-        video_codec = %RTPCodecParameters{
-          video_codec
-          | payload_type: codec.payload_type,
-            sdp_fmtp_line: codec.sdp_fmtp_line
-        }
+        codecs = List.insert_at(codecs, idx, codec)
 
-        video_codecs = List.insert_at(video_codecs, idx, video_codec)
-        update_codecs(sdp_codecs, audio_codecs, video_codecs)
+        case type do
+          :audio -> update_codecs(sdp_codecs, codecs, video_codecs)
+          :video -> update_codecs(sdp_codecs, audio_codecs, codecs)
+        end
     end
   end
 
diff --git a/test/ex_webrtc/peer_connection/configuration_test.exs b/test/ex_webrtc/peer_connection/configuration_test.exs

Original file line number	Diff line number	Diff line change
`@@ -19,10 +19,7 @@ defmodule Echo.PeerHandler do`
`19`	`19`	`%RTPCodecParameters{`
`20`	`20`	`payload_type: 96,`
`21`	`21`	`mime_type: "video/VP8",`
`22`		`- clock_rate: 90_000,`
`23`		`- channels: nil,`
`24`		`- sdp_fmtp_line: nil,`
`25`		`- rtcp_fbs: []`
	`22`	`+ clock_rate: 90_000`
`26`	`23`	`}`
`27`	`24`	`]`
`28`	`25`
`@@ -31,8 +28,7 @@ defmodule Echo.PeerHandler do`
`31`	`28`	`payload_type: 111,`
`32`	`29`	`mime_type: "audio/opus",`
`33`	`30`	`clock_rate: 48_000,`
`34`		`- channels: 2,`
`35`		`- sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}`
	`31`	`+ channels: 2`
`36`	`32`	`}`
`37`	`33`	`]`
`38`	`34`
Original file line number	Diff line number	Diff line change
`@@ -25,10 +25,7 @@ defmodule SaveToFile.PeerHandler do`
`25`	`25`	`%RTPCodecParameters{`
`26`	`26`	`payload_type: 96,`
`27`	`27`	`mime_type: "video/VP8",`
`28`		`- clock_rate: 90_000,`
`29`		`- channels: nil,`
`30`		`- sdp_fmtp_line: nil,`
`31`		`- rtcp_fbs: []`
	`28`	`+ clock_rate: 90_000`
`32`	`29`	`}`
`33`	`30`	`]`
`34`	`31`
`@@ -37,8 +34,7 @@ defmodule SaveToFile.PeerHandler do`
`37`	`34`	`payload_type: 111,`
`38`	`35`	`mime_type: "audio/opus",`
`39`	`36`	`clock_rate: 48_000,`
`40`		`- channels: 2,`
`41`		`- sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}`
	`37`	`+ channels: 2`
`42`	`38`	`}`
`43`	`39`	`]`
`44`	`40`
Original file line number	Diff line number	Diff line change
`@@ -29,10 +29,7 @@ defmodule SendFromFile.PeerHandler do`
`29`	`29`	`%RTPCodecParameters{`
`30`	`30`	`payload_type: 96,`
`31`	`31`	`mime_type: "video/VP8",`
`32`		`- clock_rate: 90_000,`
`33`		`- channels: nil,`
`34`		`- sdp_fmtp_line: nil,`
`35`		`- rtcp_fbs: []`
	`32`	`+ clock_rate: 90_000`
`36`	`33`	`}`
`37`	`34`	`]`
`38`	`35`
`@@ -41,8 +38,7 @@ defmodule SendFromFile.PeerHandler do`
`41`	`38`	`payload_type: 111,`
`42`	`39`	`mime_type: "audio/opus",`
`43`	`40`	`clock_rate: 48_000,`
`44`		`- channels: 2,`
`45`		`- sdp_fmtp_line: %ExSDP.Attribute.FMTP{pt: 111, minptime: 10, useinbandfec: true}`
	`41`	`+ channels: 2`
`46`	`42`	`}`
`47`	`43`	`]`
`48`	`44`