Bug 230539

Summary:	If you play a song from Spotify while in a WebRTC call, audio output is broken until refresh
Product:	WebKit	Reporter:	daginge
Component:	WebRTC	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED CONFIGURATION CHANGED
Severity:	Major	CC:	eric.carlson, glefebvr, webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	Safari 14
Hardware:	iPhone / iPad
OS:	Unspecified

Description daginge 2021-09-21 01:58:21 PDT

If a user starts playing a song from Spotify during a WebRTC call, the audio output from the remote party stops.

Repro steps:
1. Go to https://webrtc.github.io/samples/src/content/peerconnection/pc1/ on iOS 15
2. Click "Start". Observe that you can see yourself.
3. Click "Call". Observe that remote media works and you can hear yourself.
4. Go to the Spotify app. Observe that you for the time being can still hear yourself
5. Play any song or podcast and stop it.
6. Go back to the browser and see that camera still works, but audio output is now muted.

Impact:
All WebRTC services not implementing some kind of hacky workaround. This should just work.

Workaround:
Detection is hard, a refresh works, but it seems restarting the peer connection, or possibly re-attaching the srcObject might work as well.

Comment 1 Radar WebKit Bug Importer 2021-09-21 08:55:07 PDT

<rdar://problem/83353726>

Comment 2 youenn fablet 2021-09-23 06:51:06 PDT

I reproduced this on my ToT build.
According my testing, some underlying freezes are happening here, as in bug 230537 and bug 230536. This may come from the same underlying issue.

Comment 3 youenn fablet 2021-12-10 04:15:14 PST

This does not reproduce for me in latest iOS 15.2 beta (using the podcast app).

Comment 4 youenn fablet 2021-12-13 07:01:16 PST

Marking as configuration changed given it is no longer reproducing for me.

Comment 5 daginge 2021-12-14 00:36:42 PST

Just confirming this is fixed in 15.2! Really happy about this, youenn!