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'use strict';
['audio', 'video'].forEach((kind) => {
// Make sure "ontrack" fires if a prevuously rolled back track is added back.
promise_test(async t => {
const constraints = {};
constraints[kind] = true;
const stream = await navigator.mediaDevices.getUserMedia(constraints);
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTrack(track, stream);
pc2.addTrack(track, stream);
const [pc1Transceiver] = pc1.getTransceivers();
const [pc2Transceiver] = pc2.getTransceivers();
let remoteStreamViaOnTrackPromise = getRemoteStreamViaOnTrackPromise(pc2);
// Apply remote offer, but don't complete the entire exchange.
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
// The addTrack-transceiver gets associated, no need for a second
// transceiver.
assert_equals(pc2.getTransceivers().length, 1);
const remoteStream = await remoteStreamViaOnTrackPromise;
assert_equals(remoteStream.id, stream.id);
const onRemoveTrackPromise = new Promise(r => {
remoteStream.onremovetrack = () => { r(); };
});
// Cause track removal due to rollback.
await pc2.setRemoteDescription({type:'rollback'});
// The track was removed.
await onRemoveTrackPromise;
// Sanity check that ontrack still fires if we add it back again by applying
// the same remote offer.
remoteStreamViaOnTrackPromise = getRemoteStreamViaOnTrackPromise(pc2);
await pc2.setRemoteDescription(pc1.localDescription);
const revivedRemoteStream = await remoteStreamViaOnTrackPromise;
// This test only expects IDs to be the same. The same stream object should
// also be used, but this should be covered by separate tests.
// TODO(https://crbug.com/1321738): Add MediaStream identity tests.
assert_equals(remoteStream.id, revivedRemoteStream.id);
// No cheating, the same transciever should be used as before.
assert_equals(pc2.getTransceivers().length, 1);
}, `[${kind}] Track with stream: removal due to disassociation in rollback and then add it back again`);
// This is the same test as above, but this time without any remote streams.
// This test could fail if [[FiredDirection]] was not reset in a rollback but
// the above version of the test might still pass due to the track being
// re-added to its stream.
promise_test(async t => {
const constraints = {};
constraints[kind] = true;
const stream = await navigator.mediaDevices.getUserMedia(constraints);
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTrack(track);
pc2.addTrack(track);
const [pc1Transceiver] = pc1.getTransceivers();
const [pc2Transceiver] = pc2.getTransceivers();
let remoteTrackPromise = getTrackViaOnTrackPromise(pc2);
// Apply remote offer, but don't complete the entire exchange.
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
// The addTrack-transceiver gets associated, no need for a second
// transceiver.
assert_equals(pc2.getTransceivers().length, 1);
const remoteTrack = await remoteTrackPromise;
assert_not_equals(remoteTrack, null);
// Cause track removal due to rollback.
await pc2.setRemoteDescription({type:'rollback'});
// There's nothing equivalent to stream.onremovetrack when you don't have a
// stream, but the track should become muted (if it isn't already).
if (!remoteTrack.muted) {
await new Promise(r => remoteTrack.onmute = () => { r(); });
}
assert_equals(remoteTrack.muted, true);
// Sanity check that ontrack still fires if we add it back again by applying
// the same remote offer.
remoteTrackPromise = getTrackViaOnTrackPromise(pc2);
await pc2.setRemoteDescription(pc1.localDescription);
const revivedRemoteTrack = await remoteTrackPromise;
// We can be sure the same track is used, because the same transceiver is
// used (and transciever.receiver.track has same lifetime as transceiver).
assert_equals(pc2.getTransceivers().length, 1);
assert_equals(remoteTrack, revivedRemoteTrack);
}, `[${kind}] Track without stream: removal due to disassociation in rollback and then add it back`);
// Make sure "ontrack" can fire in a rollback (undo making it inactive).
promise_test(async t => {
const constraints = {};
constraints[kind] = true;
const stream = await navigator.mediaDevices.getUserMedia(constraints);
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTrack(track, stream);
const [pc1Transceiver] = pc1.getTransceivers();
let remoteStreamViaOnTrackPromise = getRemoteStreamViaOnTrackPromise(pc2);
// Complete O/A exchange such that the transceiver gets associated.
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
const [pc2Transceiver] = pc2.getTransceivers();
assert_equals(pc2Transceiver.direction, 'recvonly');
assert_equals(pc2Transceiver.currentDirection, 'recvonly');
const remoteStream = await remoteStreamViaOnTrackPromise;
assert_equals(remoteStream.id, stream.id);
const onRemoveTrackPromise = new Promise(r => {
remoteStream.onremovetrack = () => { r(); };
});
// Cause track removal.
pc1Transceiver.direction = 'inactive';
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
// The track was removed.
await onRemoveTrackPromise;
// Rolling back the offer revives the track, causing ontrack to fire again.
remoteStreamViaOnTrackPromise = getRemoteStreamViaOnTrackPromise(pc2);
await pc2.setRemoteDescription({type:'rollback'});
const revivedRemoteStream = await remoteStreamViaOnTrackPromise;
// This test only expects IDs to be the same. The same stream object should
// also be used, but this should be covered by separate tests.
// TODO(https://crbug.com/1321738): Add MediaStream identity tests.
assert_equals(remoteStream.id, revivedRemoteStream.id);
}, `[${kind}] Track with stream: removal due to direction changing and then add back using rollback`);
// Same test as above but without remote streams.
promise_test(async t => {
const constraints = {};
constraints[kind] = true;
const stream = await navigator.mediaDevices.getUserMedia(constraints);
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
const pc1 = new RTCPeerConnection();
t.add_cleanup(() => pc1.close());
const pc2 = new RTCPeerConnection();
t.add_cleanup(() => pc2.close());
pc1.addTrack(track);
const [pc1Transceiver] = pc1.getTransceivers();
let remoteTrackPromise = getTrackViaOnTrackPromise(pc2);
// Complete O/A exchange such that the transceiver gets associated.
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
const [pc2Transceiver] = pc2.getTransceivers();
assert_equals(pc2Transceiver.direction, 'recvonly');
assert_equals(pc2Transceiver.currentDirection, 'recvonly');
const remoteTrack = await remoteTrackPromise;
// Cause track removal.
pc1Transceiver.direction = 'inactive';
await pc1.setLocalDescription();
await pc2.setRemoteDescription(pc1.localDescription);
// There's nothing equivalent to stream.onremovetrack when you don't have a
// stream, but the track should become muted (if it isn't already).
if (!remoteTrack.muted) {
await new Promise(r => remoteTrack.onmute = () => { r(); });
}
assert_equals(remoteTrack.muted, true);
// Rolling back the offer revives the track, causing ontrack to fire again.
remoteTrackPromise = getTrackViaOnTrackPromise(pc2);
await pc2.setRemoteDescription({type:'rollback'});
const revivedRemoteTrack = await remoteTrackPromise;
// We can be sure the same track is used, because the same transceiver is
// used (and transciever.receiver.track has same lifetime as transceiver).
assert_equals(pc2.getTransceivers().length, 1);
assert_equals(remoteTrack, revivedRemoteTrack);
}, `[${kind}] Track without stream: removal due to direction changing and then add back using rollback`);
});
function getTrackViaOnTrackPromise(pc) {
return new Promise(r => {
pc.ontrack = e => {
pc.ontrack = null;
r(e.track);
};
});
}
function getRemoteStreamViaOnTrackPromise(pc) {
return new Promise(r => {
pc.ontrack = e => {
pc.ontrack = null;
r(e.streams[0]);
};
});
}
</script>
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