AudioContext stops playing when suspended on visibilitychange 
https://bugs.webkit.org/show_bug.cgi?id=202846
Summary AudioContext stops playing when suspended on visibilitychange
Jesper van den Ende
Reported 2019-10-11 03:48:51 PDT
Created attachment 380740 [details] demonstration of the issue When suspending an audio context in the visibilitychange event of a document, resuming the audio context does not start playing audio. Check the attached file for a demonstration. -open the file on safari on iOS 13.1.2 -tap the resume button -close safari -note how the audio stops playing -open safari again -note how the audio does not resume, the current time stays the same even though the state of the audio context is still "running" -tapping the resume button doesn't do anything -only after tapping the suspend button and then the resume button, the audio context starts playing -when 'suspend on visibility change' is unchecked, the problem does not occur. -the problem also does not occur on iOS 12, though on iOS 12 the audio keeps on playing when the checkbox is not checked. I wasn't able to reproduce this issue in the simulator on iOS 13.1, I was not able to download the iOS 13.1.2 simulator.
Attachments
demonstration of the issue (1.11 KB, text/html)
2019-10-11 03:48 PDT, Jesper van den Ende 		no flags
Details
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Jesper van den Ende
Comment 1 2019-10-11 04:27:14 PDT
A temporary workaround for this issue is to put the ctx.resume() call of the visibilitychange event in a setTimeout with about 300ms.
Radar WebKit Bug Importer
Comment 2 2019-10-11 09:59:39 PDT
<rdar://problem/56194169>
John Doe
Comment 3 2020-12-24 04:47:21 PST
The setTimeout of ≈ 300 is also required for resuming the audioContext on pageshow, as it seems. Though I'm not sure why I need to call resume on pageshow, shouldn't that be done automatic by the browser as it suspends the audioContext when leaving the page?
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