[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 #118 from Jörg Höhle <hoehle at users.sourceforge.net> 2012-01-03 10:46:59 CST ---
I've thought more about timelines and start thresholds and came to the
conclusion that winealsa needs
 start_threshold = alsa_period + mmdevapi_period
   + a little like 3ms or 1/3 mmdevapi_period
The "a little" allows event delivery to be delayed by as much, when the system
is highly loaded.  Only then is underrun free behaviour designed into the code
in the worst case scenario (comment #16 without even prefill).

This is based on the consideration that ALSA's avail is unlike mmdevapi's
padding: Observe avail = buffer_size and you've hit an underun (with hw:0 and
probably dmix).  Observe GetCurrentPadding = 0 and you have one period time to
supply data.  Also, ALSA's hw:0 and dmix operate in period-sized chunks, so
ALSA should always have at least own period of data that it can consume.

Currently, I'm unsure whether start_threshold is the way to go or whether to
write a lead-in, because I don't know yet how to mix that with the need for
trailing silence or when exactly to write trailing silence given the PulseAudio
bugs that lead to unreliable snd_pcm_avail_update values.

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