[Webkit-unassigned] [Bug 180342] New: replaceTrack triggers negotiationneeded

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sun Dec 3 19:48:25 PST 2017


            Bug ID: 180342
           Summary: replaceTrack triggers negotiationneeded
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrew at tokbox.com
                CC: youennf at gmail.com

1. Go to basic peer connection demo from webrtc samples: https://webrtc.github.io/samples/src/content/peerconnection/pc1/
2. Run this in the console:
(async () => {
  pc1.addEventListener('negotiationneeded', evt => console.log('pc1 negotiationneeded', evt));
  await new Promise(resolve => setTimeout(resolve, 250));
  const initialVideoTrack = pc1.getSenders()[1].track;
  await pc1.getSenders()[1].replaceTrack(initialVideoTrack);
})().catch(err => console.error(err));

Result: 'pc1 negotiationneeded [...]' is logged
Expected: 'pc1 negotiationneeded [...]' is not logged (and no visible changes really)

I could be wrong about this being a bug, but Firefox does not do this, and in my understanding the whole point of replaceTrack is that you can just start pulling frames from a new source and nothing much needs to happen.

Safari 11 stable is also affected. Tested on (non-high) Sierra.

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