[Bug 28723] Sound stutter in Rage when emulated windows version is set to "Windows 7" (XAudio2 -> mmdevapi sound output path)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=28723

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

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--- Comment #21 from Jörg Höhle <hoehle at users.sourceforge.net> 2011-11-03 08:50:06 CDT ---
Interesting issue.
I've never seen native tests report anything else beside 10.0000 and 10.1587ms
(alignment for Intel HDA) shared mode default periods.  So reporting anything
else is out of question.

However, what native is said to do and Wine doesn't is to clamp period and
duration.  From what I've read (but not yet tested, which is why I've not yet
written that patch),
- max duration is 2s in shared mode, 500ms in exclusive mode
- min. duration should probably be 3*period (at least for Wine)
- min period is 3ms (from GetDefaultPeriod)
- max period is 100ms (I think I read that somewhere)

Note that Wine still has a related bug: it must ignore period in shared mode.

Alexey, how does that app react if you internally set duration to 30ms even
when it asks for 20ms?  From your description, it would initially fill half of
it, i.e. 15ms, then receive an event and fill 10ms more, which would not be
that bad.
Does GetStreamLatency influence XA2?

Of course, what would really be nice is to signal events at the earliest
possible time when timing is tight, i.e. ALSA -> mmdevapi -> app.  The cascade
of periodic timers obviously causes latency.

I believe native can get away with a buffer size slightly > 11ms.  Presumably,
when the periodic 10ms event fires, the mixer has mixed 10ms of data that was
immediately fed to the HW and the app has ~9ms to provide the next chunk.  Wine
needs more latency because mixer and event and HW are not synchronised, e.g.
winmm has a periodic feeder thread, mmdevapi adds another one etc.

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