202846 2019-10-11 03:48:51 -0700 AudioContext stops playing when suspended on visibilitychange 2024-11-11 23:43:15 -0800 1 1 1 Unclassified WebKit Web Audio Other iPhone / iPad iOS 13 NEW https://bugs.webkit.org/show_bug.cgi?id=281566 InRadar P2 Normal --- 1 jespertheend webkit-unassigned cdumez eric.carlson jer.noble jespertheend johndoe437528 webkit-bug-importer oldest_to_newest 1579059 0 380740 jespertheend 2019-10-11 03:48:51 -0700 Created attachment 380740 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. 1579064 1 jespertheend 2019-10-11 04:27:14 -0700 A temporary workaround for this issue is to put the ctx.resume() call of the visibilitychange event in a setTimeout with about 300ms. 1579133 2 webkit-bug-importer 2019-10-11 09:59:39 -0700 <rdar://problem/56194169> 1716568 3 johndoe437528 2020-12-24 04:47:21 -0800 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? 380740 2019-10-11 03:48:51 -0700 2019-10-11 03:48:51 -0700 demonstration of the issue webkitaudiobug.html text/html 1138 jespertheend PCFET0NUWVBFIGh0bWw+CjxodG1sPgoJPGhlYWQ+CgkJPHRpdGxlPldlYmtpdCBidWc8L3RpdGxl PgoJPC9oZWFkPgoJPGJvZHk+CgkJPGRpdiBpZD0ic3RhdGUiPjwvZGl2PgoJCTxkaXYgaWQ9InRp bWUiPjwvZGl2PgoJCTxsYWJlbD4KCQkJPGlucHV0IHR5cGU9ImNoZWNrYm94IiBpZD0iYXV0b3N1 c3BlbmQiIGNoZWNrZWQ9InRydWUiPgoJCQlzdXNwZW5kIG9uIHZpc2liaWxpdHkgY2hhbmdlCgkJ PC9sYWJlbD4KCQk8YnI+CgkJPGJ1dHRvbiBvbmNsaWNrPSJjdHguc3VzcGVuZCgpIj5zdXNwZW5k PC9idXR0b24+CgkJPGJ1dHRvbiBvbmNsaWNrPSJjdHgucmVzdW1lKCkiPnJlc3VtZTwvYnV0dG9u PgoJCTxzY3JpcHQ+CgkJCXdpbmRvdy5BdWRpb0NvbnRleHQgPSB3aW5kb3cuQXVkaW9Db250ZXh0 IHx8IHdpbmRvdy53ZWJraXRBdWRpb0NvbnRleHQ7CgkJCWxldCBjdHggPSBuZXcgQXVkaW9Db250 ZXh0KCk7CgkJCWxldCBvc2NpbGxhdG9yID0gY3R4LmNyZWF0ZU9zY2lsbGF0b3IoKTsKCQkJb3Nj aWxsYXRvci50eXBlID0gInNpbmUiOwoJCQlvc2NpbGxhdG9yLmZyZXF1ZW5jeS52YWx1ZSA9IDQ0 MDsKCQkJb3NjaWxsYXRvci5jb25uZWN0KGN0eC5kZXN0aW5hdGlvbik7CgkJCW9zY2lsbGF0b3Iu c3RhcnQoKTsKCgkJCWZ1bmN0aW9uIHVwZGF0ZVN0YXRzKCl7CgkJCQlkb2N1bWVudC5nZXRFbGVt ZW50QnlJZCgidGltZSIpLnRleHRDb250ZW50ID0gIkN1cnJlbnQgVGltZTogIitjdHguY3VycmVu dFRpbWU7CgkJCQlkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgic3RhdGUiKS50ZXh0Q29udGVudCA9 ICJTdGF0ZTogIitjdHguc3RhdGU7CgkJCQl3aW5kb3cucmVxdWVzdEFuaW1hdGlvbkZyYW1lKHVw ZGF0ZVN0YXRzKTsKCQkJfQoJCQl1cGRhdGVTdGF0cygpOwoKCQkJZG9jdW1lbnQuYWRkRXZlbnRM aXN0ZW5lcigidmlzaWJpbGl0eWNoYW5nZSIsIF8gPT4gewoJCQkJaWYoZG9jdW1lbnQuZ2V0RWxl bWVudEJ5SWQoImF1dG9zdXNwZW5kIikuY2hlY2tlZCl7CgkJCQkJaWYoZG9jdW1lbnQuaGlkZGVu KXsKCQkJCQkJY3R4LnN1c3BlbmQoKTsKCQkJCQl9ZWxzZXsKCQkJCQkJY3R4LnJlc3VtZSgpOwoJ CQkJCX0KCQkJCX0KCQkJfSwgZmFsc2UpOwoJCTwvc2NyaXB0PgoJPC9ib2R5Pgo8L2h0bWw+Cg==