transceiver-direction-match.html

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This WPT test may be referenced by the following Test IDs:
- /webrtc/protocol/transceiver-direction-match.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<title>sendrecv transceiver is matched to remote recvonly m-section over sendonly</title>

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

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

<script>

'use strict';

promise_test(async t => {

  const ac = new AudioContext();

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

  const track = ac.createMediaStreamDestination().stream.getAudioTracks()[0];

  t.add_cleanup(() => track.stop());

  const pc = new RTCPeerConnection();

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

  pc.addTrack(track);

  assert_equals(pc.getTransceivers().length, 1);

  assert_equals(pc.getTransceivers()[0].direction, 'sendrecv');

  const transceiver = pc.getTransceivers()[0];

  // Remote offer: sendonly first, then recvonly, both audio.

  // Per JSEP, a sendrecv transceiver should match the recvonly section

  // (where the remote wants to receive our track) rather than the sendonly section.

  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

a=ice-ufrag:ETEn

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

m=audio 9 UDP/TLS/RTP/SAVPF 111

c=IN IP4 0.0.0.0

a=rtcp-mux

a=sendonly

a=mid:1

a=rtpmap:111 opus/48000/2

a=setup:actpass

m=audio 9 UDP/TLS/RTP/SAVPF 111

c=IN IP4 0.0.0.0

a=rtcp-mux

a=recvonly

a=mid:2

a=rtpmap:111 opus/48000/2

a=setup:actpass

`;

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

  await pc.setLocalDescription();

  assert_equals(transceiver.mid, '2',

    'sendrecv transceiver should be bound to the recvonly m-section');

}, 'sendrecv transceiver is matched to remote recvonly m-section when offer has sendonly before recvonly');

</script>