[Webkit-unassigned] [Bug 208516] New: Audio fails to capture stream in WebRTC

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Mar 3 08:53:12 PST 2020


            Bug ID: 208516
           Summary: Audio fails to capture stream in WebRTC
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: david.engelmaier at doclerholding.com
                CC: youennf at gmail.com

Created attachment 392279

  --> https://bugs.webkit.org/attachment.cgi?id=392279&action=review

Multiple audio tracks listed

When an application that uses camera and/or microphone is used(ie called to) during the time a web app with webrtc functionality is open, the web app is never
able to capture audio from the stream.

1. iphone 8 with ios 13.3.1
2. skype installed on the device with an account logged in, also teams, call app or facetime have been reported to work, although i was using mostly skype

Steps to reproduce:
1. open https://webrtc.github.io/samples/src/content/peerconnection/pc1/ in safari
2. start, call, hangup, reload the tab
3. call the device on skype, reject the call
4. go back to the safari tab, start, call, video frozen, no sound, from now on you can not use webrtc audio in safari, not even newly open tabs
5. connect to the iphone from safari develoop, run:
navigator.mediaDevices.getUserMedia({audio: true, video: true}).then(stream => {stream.getTracks().forEach(track => {track.stop();console.log(track.getSettings().sampleRate);console.log(track)})}).catch(error => {console.log(error)});

you'll see the sampleRate being always 0, sometimes calling the above code along with document.location.reload() multiple times(see attached screenshot) can bring safari back to working
webrtc audio, however this is very sporadic and can not be used as a workaround

This very issue was first filed as a bug here on 2017-12-13 06:02:09 PST https://bugs.webkit.org/show_bug.cgi?id=180748 and marked as resolved, however still happening.

There is also an interesting listing of media tracks in the attachment as you can see at one point there are 2 audio and 2 video tracks for the same interfaces

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