Bug 172261 – createMediaStreamSource only works when called shortly after stream is created

• Status: RESOLVED
• Resolution: WORKSFORME
• Component: Web Audio

[Andrew Morris]

WebKit's createMediaStreamSource has a bug which requires it to be called very soon after the stream is created. If called after a delay it appears to produce a silent webaudio node.
navigator.mediaDevices.getUserMedia({ audio: true }).then((stream) => {
  cleanupJobs.push(() => stream.getTracks().forEach(track => track.stop()));

  if (useDelay) {
    // Bug occurs
    return delay(500).then(() => stream);
  }

  // Bug does not occur
  return stream;
}).then((stream) => {
  const source = audioCtx.createMediaStreamSource(stream);

  // ... Visualize audio data from source

};

Super easy repro here:
https://output.jsbin.com/hegijaz

Built from github hash 141b0ddff819d52e6e8ceeed29dc72fba5d4b1a6, git-svn-id: http://svn.webkit.org/repository/webkit/trunk@216354 268f45cc-cd09-0410-ab3c-d52691b4dbfc

[Radar WebKit Bug Importer]

<rdar://problem/32266432>

[Andrew Morris]

The jsbin doesn't repro the issue for me anymore in a more recent build (git b54ca7d). However I suspect the issue is still there for remote streams. Please get in touch for more details if needed.

[Daniel Rossi]

The problem is evident here merely changing streams and setting up a new mediastreamsource. on IOS

https://jsfiddle.net/danrossi303/gsLy96hc/3/