[Webkit-unassigned] [Bug 243727] New: Web Audio API in WKWebView permanently muted after incoming call

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243727

            Bug ID: 243727
           Summary: Web Audio API in WKWebView permanently muted after
                    incoming call
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com
                CC: cdumez at apple.com

When using the Web Audio API in WKWebView, if the device receives an incoming call, it permanently mutes the AudioContext. This appears to be unrecoverable and the app has no way to restore audio playback. The AudioContext state is left as "running" but no audio output can be heard.

The issue does not appear to affect the Safari browser, which can correctly play audio after an incoming call; it only seems to affect content in WKWebView in an app. However this covers all content made with frameworks like Cordova. It causes customer complaints for our software Construct (www.construct.net) which uses Cordova, e.g.: https://github.com/Scirra/Construct-3-bugs/issues/5954

It is sufficient to call the device and hear the ringtone, and then hang up. There is no need to actually accept the call to reproduce the issue, merely receiving a call and declining will cause all audio output from WKWebView to stop.

Tested on an iPhone XS Max running iOS 15.6. I can provide a repro case using a full Cordova app, but I'm not sure how to prepare a minimal repro for WKWebView not using a framework like Cordova. I think that merely running any Web Audio sample in WKWebView and then calling the device ought to reproduce the issue. I can try to provide a minimal repro if you can advise on how to provide a minimal test case for WKWebView.

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