[Bug 38421] Windows Media Player 9 & 10: mp3 sound plays too fast

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38421

Zebediah Figura <z.figura12 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|-unknown                    |quartz

--- Comment #10 from Zebediah Figura <z.figura12 at gmail.com> ---
Now that I have a better understanding of how quartz works:

The program is chaining a series of filters with the names:

WMRenderer Source Filter -> WMPlayer Time Compression DMO -> Volume
Normalization DMO -> Seamless Audio DMO -> WMPlayer SRSWow DMO -> WMPlayer
Equalizer DMO -> WMPlayer Spectrum Analyzer DMO -> Audio Renderer


Only the last one is ours. The source filter internally uses msacm32 to convert
mp3 to wav. But the problem isn't there; indeed using native l3codeca.acm shows
the same problem. The problem is actually the "Seamless Audio DMO", which seems
to be completely dropping any samples which are quieter than a certain cutoff.
Sort of like a gate, except that the samples are removed completely rather than
just being truncated to silence.

I think the regression is not because it couldn't find an mp3 -> wav DMO (there
isn't necessarily one on Windows either), but rather because if DMOGetName()
works it won't add these intermediate filters.

Since native quartz fixes the problem, I'm setting the component to quartz.
It's not clear what we should be doing—either not adding the filter, or perhaps
there's something wrong with how we're passing samples around.

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