[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

--- Comment #99 from Jörg Höhle <hoehle at users.sourceforge.net> 2011-12-19 04:25:21 CST ---
Playing more with ALSA, I convinced myself that a simple combination of
period_near and buffer_near is not enough to guarantee identical behaviour on
all machines.

Consider dmix at 48000:
set_period_near(10ms) -> 21333ms(!)
set_buffer_near(30ms) -> 42666ms (= 2x ALSA period)
Even buffer_near 40ms wouldn't make a difference...

Do you believe that the current winealsa.drv logic can drive an ALSA device
from only 2 periods without underruns, considering that ALSA always wants a
full period before submitting anything?

OTOH, using hw:0
set_period_near(10ms) -> 10ms
set_buffer_near(30ms) -> 30ms
presumably works much better.  That's why we need to mention the actual
period&buffer sizes when reporting that app X had an underrun.

set_period_near(10ms)
set_hw_params_periods(3); or 4
may be a better choice for the current driver.


BTW, in comment #21, I expressed the idea that at the time the first event is
received, the mixer already has shoveled one period of data.  If you look at
testbot job 15962, you'll see that GCP has decreased by one (480) or sometimes
2 periods (960 frames) after the first WaitFor(Event). It always had decreased
in EVENTCALLBACK mode.

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