[Webkit-unassigned] [Bug 226698] New: Manually resuming a video after phone call prevents other videos in a session from resuming

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226698

            Bug ID: 226698
           Summary: Manually resuming a video after phone call prevents
                    other videos in a session from resuming
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Kongpheng.Nanthavongsa at vonage.com
                CC: youennf at gmail.com

I was able to reproduce this issue on iOS Safari 14.7 (18G5023c).

To reproduce:
* Using iOS Safari, go to https://webrtc.github.io/samples/src/content/peerconnection/pc1/
* On the console, enter: var video = $('#remoteVideo'); video.onpause = () => { console.log('paused; resuming play'); video.play(); }
* Click Start button.  If prompted for access for camera and microphone, then grant access
* Click Call button to start the one-to-one video call
* Using another phone, call the iPhone iOS Safari is running on
* From iPhone iOS Safari is running on, reject the call
* Notice that only one of the videos resumes.  The other does not.

We have a potential workaround for this issue.  Initial testing looks OK.  That said, will need to test more thoroughly.  The heuristic:
* When the pause event is dispatched after a phone call ends, check "paused" state of all video elements in application
* If other videos are paused as well, then they were likely paused because a phone call just ended
* Call play() on all video elements to ensure they're all resumed

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