transceiver-mline-recycling.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webrtc/protocol/transceiver-mline-recycling.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>payload type handling (assuming rtcp-mux)</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="../third_party/sdp/sdp.js"></script>

<script>

promise_test(async t => {

  const pc1 = new RTCPeerConnection();

  t.add_cleanup(() => pc1.close());

  const pc2 = new RTCPeerConnection();

  t.add_cleanup(() => pc2.close());

  const negotiate = async () => {

    await pc1.setLocalDescription();

    await pc2.setRemoteDescription(pc1.localDescription);

    await pc2.setLocalDescription();

    await pc1.setRemoteDescription(pc2.localDescription);

};

  // Add audio, negotiate, stop the transceiver, negotiate again,

  // add another audio transceiver and negotiate. This should re-use the m-line.

  pc1.addTransceiver('audio');

  await negotiate();

  pc1.getTransceivers()[0].stop();

  await negotiate();

  pc1.addTransceiver('audio');

  await negotiate();

  let numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;

  assert_equals(numberOfMediaSections, 1, 'Audio m-line gets reused for audio transceiver');

  // Stop the audio transceiver, negotiate, add a video transceiver, negotiate.

  // This should reuse the m-line.

  pc1.getTransceivers()[0].stop();

  await negotiate();

  pc1.addTransceiver('video');

  await negotiate();

  numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;

  assert_equals(numberOfMediaSections, 1, 'Audio m-line gets reused for video transceiver');

  // Add another video transceiver after stopping the current one.

  // This should re-use the m-line.

  pc1.getTransceivers()[0].stop();

  await negotiate();

  pc1.addTransceiver('video');

  await negotiate();

  numberOfMediaSections = SDPUtils.splitSections(pc1.localDescription.sdp).length - 1;

  assert_equals(numberOfMediaSections, 1, 'Video m-line gets reused for video transceiver');

}, 'Reuses m-lines in local negotiation');

promise_test(async t => {

  // SDP with a rejected video m-line.

  const sdp = `v=0

o=- 0 3 IN IP4 127.0.0.1

s=-

t=0 0

a=fingerprint:sha-256 A7:24:72:CA:6E:02:55:39:BA:66:DF:6E:CC:4C:D8:B0:1A:BF:1A:56:65:7D:F4:03:AD:7E:77:43:2A:29:EC:93

m=video 0 UDP/TLS/RTP/SAVPF 100

c=IN IP4 0.0.0.0

a=rtcp-mux

a=sendonly

a=mid:video

a=rtpmap:100 VP8/90000

a=setup:actpass

a=ice-ufrag:ETEn

a=ice-pwd:OtSK0WpNtpUjkY4+86js7Z/l

`;

  const pc1 = new RTCPeerConnection();

  t.add_cleanup(() => pc1.close());

  await pc1.setRemoteDescription({type: 'offer', sdp});

  await pc1.setLocalDescription();

  assert_equals(pc1.getTransceivers().length, 0);

  pc1.addTransceiver('audio');

  let offer = await pc1.createOffer();

  let numberOfMediaSections = SDPUtils.splitSections(offer.sdp).length - 1;

  assert_equals(numberOfMediaSections, 1, 'Remote video m-line gets reused for audio transceiver');

  const pc2 = new RTCPeerConnection();

  t.add_cleanup(() => pc2.close());

  await pc2.setRemoteDescription({type: 'offer', sdp});

  await pc2.setLocalDescription();

  assert_equals(pc2.getTransceivers().length, 0);

  pc1.addTransceiver('video');

  offer = await pc2.createOffer();

  numberOfMediaSections = SDPUtils.splitSections(offer.sdp).length - 1;

  assert_equals(numberOfMediaSections, 1, 'Remote video m-line gets reused for video transceiver');

}, 'Reuses m-lines in remote negotiation');

</script>