[Bug 29497] Alonix only plays every other sound effect in menus

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=29497

Jörg Höhle <hoehle at users.sourceforge.net> changed:

           What    |Removed                     |Added
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                 CC|                            |hoehle at users.sourceforge.ne
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--- Comment #1 from Jörg Höhle <hoehle at users.sourceforge.net> 2011-12-31 10:40:03 CST ---
This is possibly a duplicate of bug #29472 -- DSound erroneously using mmdevapi
GetPosition -- rather than bug #29299 -- ALSA needs a full period to start.

DSound is fed 50KB of data, yet PerformMix only sends 512 frames to mmdevapi.
It is perhaps confused by GetPosition returning 0 because ALSA has not yet
started to play. ALSA will not start yet because it wants at least one period
worth of data. DSound must nevertheless stream data into mmdevapi.

After start at time 2908ms, it is only ~1s later at time 3848ms that DSound
writes another 512 frames, causing ALSA to start.  Does the app then play the
sound effect twice (like old bug #26878)?


>AudioClient_Initialize ALSA period: 940 frames
>AudioClient_Initialize ALSA buffer: 3763 frames
>AudioClient_Initialize MMDevice period: 441 frames
>AudioClient_Initialize MMDevice buffer: 5120 frames
You appear to be using ALSA's rate converter plugin + dmix, running at and
resampling to 48000 Hz while the app requests 44100.
We'll have to keep in mind that when rounding is involved,
pcm_set_periods_near(4) does not guarantee that ALSA's buffer is an exact
multiple of the period size in frames.  In this case, the period time is
21333.333µs (a little more than 940 frames) and ALSA computes 3763 frames, not
3764 or 3760!

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