[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 #57 from Alexey Loukianov <mooroon2 at mail.ru> 2011-11-29 03:50:21 CST ---
(In reply to comment #55)
> It is pretty much in line with values reported by Wine with applied
> patchset from comment #54 - average lag behind ~33ms, which suspiciously low as
> we should have around 30ms of data (3xPeriod) sitting at ALSA buffer and
> another 10ms of data held in mmdevdev buffer resulting in around 40ms of lag. 

Thinking more about it makes me fill that's everything is correct here - we
have in ALSA buffer not strictly 3xPeriod, but some amount of data which is: 
2xPeriod < amount_of_data <= 3xPeriod. Inspecting logs shows that during normal
playback amount_of_data drifts from 3xPeriod downwards to 2xPeriod in around
~16 frames per 10ms steps, thus delay_frames should be ~25ms of audio data in
average. ~25ms in ALSA + ~10ms in mmdevdrv = ~35ms of lag which is close to
observed ~33.3ms. Thus GetPosition seems to be implemented in mostly correct
way, the only problem is the devpos != total_samples_sent case which should be
investigated further.

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