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gecko-dev/testing/web-platform/tests/webrtc/RTCPeerConnection-transceivers.https.html
Henrik Boström 5a3427bfce Bug 1545667 [wpt PR 16350] - [PeerConnection] Fix crash: Old state information surfaced in SLD/SRD., a=testonly 
Automatic update from web-platform-tests
[PeerConnection] Fix crash: Old state information surfaced in SLD/SRD.

Because of WebRTC's blocking-invoke threading model, the order of events
are not always the same in the content and webrtc layers, causing bugs
in some edge-cases.

For example, addTrack() and setLocalDescription() both modify the set
of transceivers. addTrack() does so with a blocking-invoke, and SLD()
does so asynchronously, where the state change is surfaced in a
callback.

In rare cases, it is possible for addTrack() to modify the sender's
track and then for a setLocalDescription() callback carrying outdated
transceiver state information to null the track. And similarly this
could happen reverting changes to the transceiver's direction.

This makes the content layer not reflect the webrtc layer, which in
the referenced bug even causes a crash because a track adapter no
longer exists.

The fix is not to update "transceiver.sender.track" or
"transceiver.direction" in SLD/SRD callbacks for transceivers that
already exists. This is valid, because these fields can only be
modified by other APIs (addTrack, replaceTrack, direction, etc) and
not by SDP.

Bug: 950280
Change-Id: Icdcc65c5f8b5861550bda588597b88f6103c4f70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566346
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#651234}

--

wpt-commits: 0f77903212bc58697fdc8de2e34373537214f955
wpt-pr: 16350
2019-06-05 10:26:20 +01:00

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<!doctype html>
<meta name="timeout" content="long"/>
<meta charset=utf-8>
<title>RTCPeerConnection-transceivers.https.html</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';
// The following helper functions are called from RTCPeerConnection-helper.js:
// exchangeOffer
// exchangeOfferAndListenToOntrack
// exchangeAnswer
// exchangeAnswerAndListenToOntrack
// addEventListenerPromise
// createPeerConnectionWithCleanup
// createTrackAndStreamWithCleanup
// findTransceiverForSender
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const sender = pc.addTrack(track, stream);
const transceiver = findTransceiverForSender(pc, sender);
assert_true(transceiver instanceof RTCRtpTransceiver);
assert_true(transceiver.sender instanceof RTCRtpSender);
assert_equals(transceiver.sender, sender);
}, 'addTrack: creates a transceiver for the sender');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_array_equals(pc.getTransceivers(), [transceiver],
'pc.getTransceivers() equals [transceiver]');
assert_array_equals(pc.getSenders(), [transceiver.sender],
'pc.getSenders() equals [transceiver.sender]');
assert_array_equals(pc.getReceivers(), [transceiver.receiver],
'pc.getReceivers() equals [transceiver.receiver]');
}, 'addTrack: "transceiver == {sender,receiver}"');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_true(transceiver.sender.track instanceof MediaStreamTrack,
'transceiver.sender.track instanceof MediaStreamTrack');
assert_equals(transceiver.sender.track, track,
'transceiver.sender.track == track');
}, 'addTrack: transceiver.sender is associated with the track');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_true(transceiver.receiver instanceof RTCRtpReceiver,
'transceiver.receiver instanceof RTCRtpReceiver');
assert_true(transceiver.receiver.track instanceof MediaStreamTrack,
'transceiver.receiver.track instanceof MediaStreamTrack');
assert_not_equals(transceiver.receiver.track, track,
'transceiver.receiver.track != track');
}, 'addTrack: transceiver.receiver has its own track');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_true(transceiver.receiver.track.muted);
}, 'addTrack: transceiver.receiver\'s track is muted');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_equals(transceiver.mid, null);
}, 'addTrack: transceiver is not associated with an m-section');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_false(transceiver.stopped);
}, 'addTrack: transceiver is not stopped');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_equals(transceiver.direction, 'sendrecv');
}, 'addTrack: transceiver\'s direction is sendrecv');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
assert_equals(transceiver.currentDirection, null);
}, 'addTrack: transceiver\'s currentDirection is null');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
await pc.setLocalDescription(await pc.createOffer());
assert_not_equals(transceiver.mid, null, 'transceiver.mid != null');
}, 'setLocalDescription(offer): transceiver gets associated with an m-section');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc, pc.addTrack(track, stream));
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);
let sdp = offer.sdp;
let sdpMidLineStart = sdp.indexOf('a=mid:');
let sdpMidLineEnd = sdp.indexOf('\r\n', sdpMidLineStart);
assert_true(sdpMidLineStart != -1 && sdpMidLineEnd != -1,
'Failed to parse offer SDP for a=mid');
let parsedMid = sdp.substring(sdpMidLineStart + 6, sdpMidLineEnd);
assert_equals(transceiver.mid, parsedMid, 'transceiver.mid == parsedMid');
}, 'setLocalDescription(offer): transceiver.mid matches the offer SDP');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_true(trackEvent instanceof RTCTrackEvent,
'trackEvent instanceof RTCTrackEvent');
assert_true(trackEvent.track instanceof MediaStreamTrack,
'trackEvent.track instanceof MediaStreamTrack');
}, 'setRemoteDescription(offer): ontrack fires with a track');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
pc1.addTrack(track, stream);
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_true(trackEvent.track instanceof MediaStreamTrack,
'trackEvent.track instanceof MediaStreamTrack');
assert_equals(trackEvent.streams.length, 1,
'trackEvent contains a single stream');
assert_true(trackEvent.streams[0] instanceof MediaStream,
'trackEvent has a MediaStream');
assert_equals(trackEvent.streams[0].id, stream.id,
'trackEvent.streams[0].id == stream.id');
}, 'setRemoteDescription(offer): ontrack\'s stream.id is the same as stream.id');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_true(trackEvent.transceiver instanceof RTCRtpTransceiver,
'trackEvent.transceiver instanceof RTCRtpTransceiver');
}, 'setRemoteDescription(offer): ontrack fires with a transceiver.');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc1, pc1.addTrack(track, stream));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(transceiver.mid, trackEvent.transceiver.mid);
}, 'setRemoteDescription(offer): transceiver.mid is the same on both ends');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
const transceiver = trackEvent.transceiver;
assert_array_equals(pc2.getTransceivers(), [transceiver],
'pc2.getTransceivers() equals [transceiver]');
assert_array_equals(pc2.getSenders(), [transceiver.sender],
'pc2.getSenders() equals [transceiver.sender]');
assert_array_equals(pc2.getReceivers(), [transceiver.receiver],
'pc2.getReceivers() equals [transceiver.receiver]');
}, 'setRemoteDescription(offer): "transceiver == {sender,receiver}"');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.transceiver.direction, 'recvonly');
}, 'setRemoteDescription(offer): transceiver.direction is recvonly');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.transceiver.currentDirection, null);
}, 'setRemoteDescription(offer): transceiver.currentDirection is null');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_false(trackEvent.transceiver.stopped);
}, 'setRemoteDescription(offer): transceiver.stopped is false');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const pc2 = createPeerConnectionWithCleanup(t);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
const transceiver = trackEvent.transceiver;
assert_equals(transceiver.currentDirection, null,
'SRD(offer): transceiver.currentDirection is null');
await pc2.setLocalDescription(await pc2.createAnswer());
assert_equals(transceiver.currentDirection, 'recvonly',
'SLD(answer): transceiver.currentDirection is recvonly');
}, 'setLocalDescription(answer): transceiver.currentDirection is recvonly');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = findTransceiverForSender(pc1, pc1.addTrack(track, stream));
const pc2 = createPeerConnectionWithCleanup(t);
await exchangeOffer(pc1, pc2);
assert_equals(transceiver.currentDirection, null,
'SLD(offer): transceiver.currentDirection is null');
await exchangeAnswer(pc1, pc2);
assert_equals(transceiver.currentDirection, 'sendonly',
'SRD(answer): transceiver.currentDirection is sendonly');
}, 'setLocalDescription(answer): transceiver.currentDirection is sendonly');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver(track);
assert_true(transceiver instanceof RTCRtpTransceiver);
assert_true(transceiver.sender instanceof RTCRtpSender);
assert_true(transceiver.receiver instanceof RTCRtpReceiver);
assert_equals(transceiver.sender.track, track);
}, 'addTransceiver(track): creates a transceiver for the track');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver(track);
assert_array_equals(pc.getTransceivers(), [transceiver],
'pc.getTransceivers() equals [transceiver]');
assert_array_equals(pc.getSenders(), [transceiver.sender],
'pc.getSenders() equals [transceiver.sender]');
assert_array_equals(pc.getReceivers(), [transceiver.receiver],
'pc.getReceivers() equals [transceiver.receiver]');
}, 'addTransceiver(track): "transceiver == {sender,receiver}"');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver(track, {direction:'inactive'});
assert_equals(transceiver.direction, 'inactive');
}, 'addTransceiver(track, init): initialize direction to inactive');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const otherPc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver(track, {
sendEncodings: [{active:false}]
});
// Negotiate parameters.
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);
await otherPc.setRemoteDescription(offer);
const answer = await otherPc.createAnswer();
await otherPc.setLocalDescription(answer);
await pc.setRemoteDescription(answer);
const params = transceiver.sender.getParameters();
assert_false(params.encodings[0].active);
}, 'addTransceiver(track, init): initialize sendEncodings[0].active to false');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
pc1.addTransceiver(track, {streams:[]});
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 0, 'trackEvent.streams.length == 0');
}, 'addTransceiver(0 streams): ontrack fires with no stream');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
const stream = new MediaStream();
pc1.addTransceiver(track, {streams:[stream]});
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 1, 'trackEvent.streams.length == 1');
assert_equals(trackEvent.streams[0].id, stream.id,
'trackEvent.streams[0].id == stream.id');
}, 'addTransceiver(1 stream): ontrack fires with corresponding stream');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
const stream0 = new MediaStream();
const stream1 = new MediaStream();
pc1.addTransceiver(track, {streams:[stream0, stream1]});
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 2, 'trackEvent.streams.length == 2');
assert_equals(trackEvent.streams[0].id, stream0.id,
'trackEvent.streams[0].id == stream0.id');
assert_equals(trackEvent.streams[1].id, stream1.id,
'trackEvent.streams[1].id == stream1.id');
}, 'addTransceiver(2 streams): ontrack fires with corresponding two streams');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
pc1.addTrack(track);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 0, 'trackEvent.streams.length == 0');
}, 'addTrack(0 streams): ontrack fires with no stream');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
const stream = new MediaStream();
pc1.addTrack(track, stream);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 1, 'trackEvent.streams.length == 1');
assert_equals(trackEvent.streams[0].id, stream.id,
'trackEvent.streams[0].id == stream.id');
}, 'addTrack(1 stream): ontrack fires with corresponding stream');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track] = await createTrackAndStreamWithCleanup(t);
const stream0 = new MediaStream();
const stream1 = new MediaStream();
pc1.addTrack(track, stream0, stream1);
const trackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
assert_equals(trackEvent.streams.length, 2, 'trackEvent.streams.length == 2');
assert_equals(trackEvent.streams[0].id, stream0.id,
'trackEvent.streams[0].id == stream0.id');
assert_equals(trackEvent.streams[1].id, stream1.id,
'trackEvent.streams[1].id == stream1.id');
}, 'addTrack(2 streams): ontrack fires with corresponding two streams');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('audio');
assert_equals(transceiver.direction, 'sendrecv');
}, 'addTransceiver(\'audio\'): creates a transceiver with direction sendrecv');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('audio');
assert_equals(transceiver.receiver.track.kind, 'audio');
}, 'addTransceiver(\'audio\'): transceiver.receiver.track.kind == \'audio\'');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('video');
assert_equals(transceiver.receiver.track.kind, 'video');
}, 'addTransceiver(\'video\'): transceiver.receiver.track.kind == \'video\'');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('audio');
assert_equals(transceiver.sender.track, null);
}, 'addTransceiver(\'audio\'): transceiver.sender.track == null');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('audio');
assert_equals(transceiver.currentDirection, null);
}, 'addTransceiver(\'audio\'): transceiver.currentDirection is null');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const transceiver = pc.addTransceiver('audio');
assert_false(transceiver.stopped);
}, 'addTransceiver(\'audio\'): transceiver.stopped is false');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t, 'audio');
const transceiver = pc.addTransceiver('audio');
const sender = pc.addTrack(track, stream);
assert_equals(sender, transceiver.sender, 'sender == transceiver.sender');
assert_equals(sender.track, track, 'sender.track == track');
}, 'addTrack reuses reusable transceivers');
promise_test(async t => {
const pc = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t, 'audio');
const t1 = pc.addTransceiver('audio');
const t2 = pc.addTransceiver(track);
assert_not_equals(t2, t1, 't2 != t1');
assert_equals(t2.sender.track, track, 't2.sender.track == track');
}, 'addTransceiver does not reuse reusable transceivers');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t);
const pc1Transceiver = findTransceiverForSender(pc1, pc1.addTrack(track, stream));
const pc2TrackEvent = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
const pc2Transceiver = pc2TrackEvent.transceiver;
assert_equals(pc2Transceiver.direction, 'recvonly',
'pc2Transceiver.direction is recvonly after SRD(offer)');
const pc2Sender = pc2.addTrack(track, stream);
assert_equals(pc2Transceiver.sender, pc2Sender,
'pc2Transceiver.sender == sender');
assert_equals(pc2Transceiver.direction, 'sendrecv',
'pc2Transceiver.direction is sendrecv after addTrack()');
assert_equals(pc2Transceiver.currentDirection, null,
'pc2Transceiver.currentDirection is null before answer');
const pc1TrackEvent = await exchangeAnswerAndListenToOntrack(t, pc1, pc2);
assert_equals(pc2Transceiver.currentDirection, 'sendrecv',
'pc2Transceiver.currentDirection is sendrecv after SLD(answer)');
assert_equals(pc1TrackEvent.transceiver, pc1Transceiver,
'Answer: pc1.ontrack fires with the existing transceiver.');
assert_equals(pc1Transceiver.currentDirection, 'sendrecv',
'pc1Transceiver.currentDirection is sendrecv');
assert_equals(pc2.getTransceivers().length, 1,
'pc2.getTransceivers().length == 1');
assert_equals(pc1.getTransceivers().length, 1,
'pc1.getTransceivers().length == 1');
}, 'Can setup two-way call using a single transceiver');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc2 = createPeerConnectionWithCleanup(t);
const [track, stream] = await createTrackAndStreamWithCleanup(t, 'audio');
const transceiver = pc1.addTransceiver(track);
await exchangeOffer(pc1, pc2);
await exchangeAnswer(pc1, pc2);
assert_equals(transceiver.currentDirection, 'sendonly');
assert_false(transceiver.stopped);
pc1.close();
assert_equals(transceiver.currentDirection, null);
assert_true(transceiver.stopped);
}, 'Closing the PC stops the transceivers');
promise_test(async t => {
const pc1 = createPeerConnectionWithCleanup(t);
const pc1Sender = pc1.addTrack(... await createTrackAndStreamWithCleanup(t));
const localTransceiver = findTransceiverForSender(pc1, pc1Sender);
const pc2 = createPeerConnectionWithCleanup(t);
exchangeIceCandidates(pc1, pc2);
const e = await exchangeOfferAndListenToOntrack(t, pc1, pc2);
await exchangeAnswer(pc1, pc2);
localTransceiver.direction = 'inactive';
await exchangeOfferAnswer(pc1, pc2);
localTransceiver.direction = 'sendrecv';
await exchangeOfferAndListenToOntrack(t, pc1, pc2);
}, 'Changing transceiver direction to \'sendrecv\' makes ontrack fire');
// Regression test coverage for https://crbug.com/950280.
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
const pc2Promise = pc2.createOffer()
.then((offer) => { return pc1.setRemoteDescription(offer); })
.then(() => { return pc1.createAnswer(); })
.then((answer) => { return pc1.setLocalDescription(answer); });
const pc1Promise = pc1.createOffer({ offerToReceiveAudio: true})
.then(() => { pc1.addTrack(pc1.getReceivers()[0].track); });
await Promise.all([pc1Promise, pc2Promise]);
assert_equals(pc1.getSenders()[0].track, pc1.getReceivers()[0].track);
}, 'transceiver.sender.track does not revert to an old state');
// Regression test coverage for https://crbug.com/950280.
promise_test(async t => {
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
const pc2Promise = pc2.createOffer()
.then((offer) => { return pc1.setRemoteDescription(offer); })
.then(() => { return pc1.createAnswer(); });
const pc1Promise = pc1.createOffer({ offerToReceiveAudio: true})
.then(() => { pc1.getTransceivers()[0].direction = 'inactive'; });
await Promise.all([pc1Promise, pc2Promise]);
assert_equals(pc1.getTransceivers()[0].direction, 'inactive');
}, 'transceiver.direction does not revert to an old state');
</script>
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