| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>RTCRtpEncodingParameters codec opus stereo</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| 'use strict'; |
| |
| const kNumChannelsMono = 1; |
| const kNumChannelsStereo = 2; |
| const kAudioProcessingEnabled = true; |
| const kAudioProcessingDisabled = false; |
| |
| // In some implementations (e.g. Chrome), whether or not audio processing is |
| // used may affect the number of channels we get. |
| // To isolate this factor from the test, we constrain both channels and APM. |
| function getAudioConstraints(numChannels, audioProcessing) { |
| return { |
| channelCount: {exact: numChannels}, |
| autoGainControl: audioProcessing, |
| echoCancellation: audioProcessing, |
| noiseSuppression: audioProcessing |
| }; |
| } |
| |
| // Polls getSettings() until `channelCount` is known. |
| // Remote tracks don't populate their `channelCount` until media is received. |
| async function pollChannelCount(t, track) { |
| while (true) { |
| if (track.getSettings().channelCount != undefined) { |
| break; |
| } |
| await new Promise(r => t.step_timeout(r, 50)); |
| } |
| return track.getSettings().channelCount; |
| } |
| |
| promise_test(async t => { |
| const pc1 = new RTCPeerConnection(); |
| t.add_cleanup(() => pc1.close()); |
| const pc2 = new RTCPeerConnection(); |
| t.add_cleanup(() => pc2.close()); |
| pc1.onicecandidate = e => pc2.addIceCandidate(e.candidate); |
| pc2.onicecandidate = e => pc1.addIceCandidate(e.candidate); |
| |
| // Open microphone as mono. |
| const stream = await navigator.mediaDevices.getUserMedia( |
| {audio: getAudioConstraints(kNumChannelsMono, kAudioProcessingEnabled)}); |
| const [track] = stream.getTracks(); |
| t.add_cleanup(() => track.stop()); |
| // Prerequisite of the test. |
| assert_equals(track.getSettings().channelCount, 1, |
| 'Can open track in mono'); |
| |
| // Negotiate opus. |
| const transceiver = pc1.addTransceiver(track); |
| transceiver.setCodecPreferences( |
| RTCRtpSender.getCapabilities('audio').codecs.filter( |
| codec => codec.mimeType == 'audio/opus')); |
| await pc1.setLocalDescription(); |
| await pc2.setRemoteDescription(pc1.localDescription); |
| await pc2.setLocalDescription(); |
| await pc1.setRemoteDescription(pc2.localDescription); |
| |
| const [receiver] = pc2.getReceivers(); |
| const remoteTrack = receiver.track; |
| // Attaching the track to an audio element is needed for media to flow, |
| // otherwise the `channelCount` is never known. |
| const audio = document.createElement('audio'); |
| audio.srcObject = new MediaStream(); |
| audio.srcObject.addTrack(remoteTrack); |
| // The stereo opus decoder outputs stereo regardless of the signal on the |
| // wire. |
| assert_equals(await pollChannelCount(t, remoteTrack), 2, |
| 'Remote track is stereo (despite local track being mono)'); |
| }, 'Sending and receiving a mono track with opus (stereo decoder upmix)'); |
| |
| promise_test(async t => { |
| const pc1 = new RTCPeerConnection(); |
| t.add_cleanup(() => pc1.close()); |
| const pc2 = new RTCPeerConnection(); |
| t.add_cleanup(() => pc2.close()); |
| pc1.onicecandidate = e => pc2.addIceCandidate(e.candidate); |
| pc2.onicecandidate = e => pc1.addIceCandidate(e.candidate); |
| |
| // Open microphone as stereo. |
| const stream = await navigator.mediaDevices.getUserMedia( |
| {audio: getAudioConstraints(kNumChannelsStereo, kAudioProcessingDisabled)}); |
| const [track] = stream.getTracks(); |
| t.add_cleanup(() => track.stop()); |
| // Prerequisite of the test. |
| assert_equals(track.getSettings().channelCount, 2, |
| 'Can open track in stereo'); |
| |
| // Negotiate opus. |
| const transceiver = pc1.addTransceiver(track); |
| transceiver.setCodecPreferences( |
| RTCRtpSender.getCapabilities('audio').codecs.filter( |
| codec => codec.mimeType == 'audio/opus')); |
| await pc1.setLocalDescription(); |
| await pc2.setRemoteDescription(pc1.localDescription); |
| await pc2.setLocalDescription(); |
| await pc1.setRemoteDescription(pc2.localDescription); |
| |
| const [receiver] = pc2.getReceivers(); |
| const remoteTrack = receiver.track; |
| // Attaching the track to an audio element is needed for media to flow, |
| // otherwise the `channelCount` is never known. |
| const audio = document.createElement('audio'); |
| audio.srcObject = new MediaStream(); |
| audio.srcObject.addTrack(remoteTrack); |
| assert_equals(await pollChannelCount(t, remoteTrack), 2, |
| 'Remote track is also stereo'); |
| }, 'Sending and receiving a stereo track with opus'); |
| </script> |
