[Webkit-unassigned] [Bug 222098] Regression: Raw AudioBufferSourceNode playback causes repeated crackling sound

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222098

Chris Dumez <cdumez at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |keith_miller at apple.com,
                   |                            |sbarati at apple.com

--- Comment #16 from Chris Dumez <cdumez at apple.com> ---
It definitely seems there is a garbage collection issue here. When I start playing, I see some calls to AudioScheduledSourceNode::virtualHasPendingActivity(), which return false and I see JS wrappers getting garbage collection. HOWEVER, after this initial period, we go for an extended period of time without AudioScheduledSourceNode::virtualHasPendingActivity() getting called (which seems to indicate the JS wrapper aren't getting visited). Since the JS is constructing JS wrappers very aggressively and since we are not collecting them, the number of JS wrappers grows pretty quickly, once we reach ~12k-15k JS wrappers, the audio quality starts to deteriorate and craters very quickly. 

I could use some help from our GC experts here to understand why our nodes aren't getting visited in a timely fashion, allowing the number of wrappers to grow so quickly.

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