[Webkit-unassigned] [Bug 215314] Distorted audio when using createMediaElementSource

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215314

--- Comment #12 from Chris Dumez <cdumez at apple.com> ---
(In reply to Luigi Pulcini from comment #11)
> Hi, Chris,
> 
> The Safari Technology Preview is much better but I can still reproduce in
> some cases. The distortion is not as heavy as before, which confirms that
> the patch you applied definitely solves most of the resampling problems.
> 
> The scenario where I can reproduce this issue most often is the following
> one.
> 
> a. set the sample rate of the built-in device to 48 kHz, 32bit float
> b. go to https://www.waveplayer.info/createmediaelementsource-test/
> c. click on a track encoded at 44.1 kHz: the sound is glitchy (not as
> terrible as in shipping Safari, but still very noticeable)
> 
> I could not reproduce this issue 100% of the time, but I managed to get a
> glitchy sound with some combinations of device sample rate and audio file
> sample rate.
> 
> If I find a way to reproduce the issue in a consistent way, I will let you
> know.
> 
> In the meantime, thank you for reacting so promptly to my test cases.

I bisected this and this is the change that greatly progressed this test case: http://trac.webkit.org/changeset/267014/webkit

However, I have also confirmed that the audio is still bad is *some* cases (I am able to reproduce when choosing the 44.1 Khz track and a very large sample rate in Audio MIDI Setup).

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