[Webkit-unassigned] [Bug 172261] New: createMediaStreamSource only works when called shortly after stream is created

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172261

            Bug ID: 172261
           Summary: createMediaStreamSource only works when called shortly
                    after stream is created
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrew at tokbox.com

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

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