Bug 181939 – AudioBufferSourceNode start method causes OfflineAudioContext to start running

• Component: Web Audio
• Status: RESOLVED FIXED

The OfflineAudioContext.state should be "suspended" and not increment the currentTime until `startRendering` is invoked. The issue is that as soon as AudioBufferSourceNode.start is invoked, the OfflineAudioContext.state returns "running" and the OfflineAudioContext.currentTime starts incrementing usually much faster than real time. This makes it impossible to schedule anything after an AudioBufferSourceNode is started since the scheduled time will usually be in the past. 

Test case: https://jsfiddle.net/3h8e3bcg/

Should print to the console: "should be suspended: suspended" then "should still be suspended: suspended"

PASSES on Chrome, Firefox and Safari 11 on Desktop. 

FAILS on Safari on iOS 11. prints: "should be suspended: suspended" then "should still be suspended: running"

[Radar WebKit Bug Importer]

<rdar://problem/36755393>

[Sam Williams]

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But really, please do fix soon, as this bug is SO ANNOYING!!!
https://jsfiddle.net/ayunami2000/c5xdL6xL/
This is where I discovered the bug. Everything else in the JSFiddle works, but offlineAudioContext's oncomplete event never fires.
Also, https://codepen.io/tomduncalf/pen/GmvPNp works on iOS!!!

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[Jer Noble]

Created attachment 336527 [details]
Patch

[Eric Carlson]

Comment on attachment 336527 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=336527&action=review

> LayoutTests/webaudio/offlineaudiocontext-restriction.html:18
> +var calledResumeWithUserGesture = false;

Nit: this isn't used.

[WebKit Commit Bot]

Comment on attachment 336527 [details]
Patch

Clearing flags on attachment: 336527

Committed r230158: <https://trac.webkit.org/changeset/230158>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.