[Webkit-unassigned] [Bug 179964] New: Camera/microphone acquisition false positive after receiving phone call

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179964

            Bug ID: 179964
           Summary: Camera/microphone acquisition false positive after
                    receiving phone call
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            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

After a successful/normal acquisition of the camera and microphone, if they are then released, the tab stays open, and then a (regular) phone call is received, trying getUserMedia again seems to work (programmatically) but no actual video or audio is actually captured.

More specifically, we are seeing this with OpenTok and you can reproduce it like this:

1. Go to safari.opentokrtc.com
2. Fill in some arbitrary details, and enter a room, you should see the video from the front-facing camera (no need to have another participant in the room)
3. Exit the call using the red hangup button
4. Keeping Safari open, receive a call from another phone
5. Answer the call, hangup after a few seconds
6. Fill in some arbitrary details again, enter a room, and you will see a black box instead o the video from your camera

I've inspected this a little with dev tools and there is a stream object that was generated with video and audio tracks, both tracks have muted=false and enabled=true, but there is no actual media. We also seem to have the correct resolution of what the video would be too.

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