RTCPeerConnection-opus-redundancy.html

<!DOCTYPE html>
<html>
  <head>
    <title>RTCPeerConnection red+opus support</title>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
  </head>
  <body>
    <script>
// These tests are testing the support for audio/red.
// Not suitable for WPT since this is not mandatory-to-implement.
promise_test(async t => {
  const pc1 = new RTCPeerConnection();
  t.add_cleanup(() => pc1.close());
  const pc2 = new RTCPeerConnection();
  t.add_cleanup(() => pc2.close());

  const stream = await navigator.mediaDevices.getUserMedia({audio:true})
  t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));

  const sender = pc1.addTrack(stream.getAudioTracks()[0], stream);
  const codecs = RTCRtpSender.getCapabilities('audio').codecs;
  const selectedCodecIndex = codecs.findIndex(c => c.mimeType === 'audio/red' && c.clockRate === 48000);
  assert_greater_than(selectedCodecIndex, -1);
  const selectedCodec = codecs[selectedCodecIndex];
  codecs.splice(selectedCodecIndex, 1);
  codecs.unshift(selectedCodec);
  pc1.getTransceivers()[0].setCodecPreferences(codecs);
  await pc1.setLocalDescription();
  await pc2.setRemoteDescription(pc1.localDescription);
  await pc2.setLocalDescription();
  await pc1.setRemoteDescription(pc2.localDescription);

  const parameters = await sender.getParameters();
  assert_equals(parameters.codecs[0].mimeType, 'audio/red');
}, 'setCodecPreferences allows preferring audio/red + opus');
    </script>
  </body>
</html>
chromium/third_party/blink/web_tests/fast/peerconnection/RTCPeerConnection-opus-redundancy.html
