RTCMediaSourceStats with its trackIdentifier entry is handy for correlating outbound-rtp stats to a track, when using RTCPeerConnection.getStats.

This would include RTCOutboundRtpStreamStats.mediaSourceId.

It is also on the mandatory to implement list.

https://treeherder.mozilla.org/jobs?repo=try&revision=481c735a1442a94394c8dcfae2d2dcfda397cee1
https://treeherder.mozilla.org/jobs?repo=try&revision=e591440fcbf52a83ce5a59051cca1e16316631c1

Depends on D169125

Try looks fine so far, still waiting on macos tests...

Macos looks good too.

Backed out for causing build bustages on PeerConnectionImpl.cpp

• Backout link
• Push with failures
• Failure Log
• Failure line: /builds/worker/checkouts/gecko/dom/media/webrtc/jsapi/PeerConnectionImpl.cpp:2024:38: error: unused variable 'id' [-Werror=unused-variable]

mochitest log: https://treeherder.mozilla.org/logviewer?job_id=405685822&repo=autoland

Backed out for causing wpt failures in

Backout link: https://hg.mozilla.org/integration/autoland/rev/19e0bc283894a3bf801c7edb6c73879c3aeec836

Push with failures

Failure log #1 | TEST-UNEXPECTED-TIMEOUT | /webrtc/RTCPeerConnection-remote-track-mute.https.html | pc.close() on one side causes mute events on the other - Test timed out

Failure log #2 | TEST-FAIL | /webrtc/RTCPeerConnection-getStats.https.html | getStats() audio and video validate all mandatory stats - assert_equals: Expect dictionary.transportId to be string expected "string" but got "undefined"

Failure log #3 | TEST-UNEXPECTED-FAIL | /webrtc/RTCPeerConnection-getStats.https.html | getStats() on track associated with RTCRtpReceiver should return stats report containing inbound-rtp stats - assert_unreached: required stats <...>

Looks like fixing the timeout in this test...

https://searchfox.org/mozilla-central/rev/84fb1c4511312a0b9187f647d90059e3a6dd27f8/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini#12-14

...allowed these (broken) tests to start running, which would have intermittently failed if they had ever been run...

https://searchfox.org/mozilla-central/rev/84fb1c4511312a0b9187f647d90059e3a6dd27f8/testing/web-platform/meta/webrtc/RTCPeerConnection-getStats.https.html.ini#28-30,36-38

I'll file bugs and disable these.

There are some r+ patches which didn't land and no activity in this bug for 2 weeks.
:bwc, could you have a look please?
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https://hg.mozilla.org/mozilla-central/rev/e642639befc5
https://hg.mozilla.org/mozilla-central/rev/b7750fa69be6