[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 #73 from Alexey Loukianov <mooroon2 at mail.ru> 2011-12-07 05:10:37 CST ---
Thanks for submitting new patch, would take a look on it this evening. 

As for making short periods a hard requirement - wouldn't it be nicer to add-up
latency and emulate required period timing in software (actually it is already
as timer callbacks are independent from ALSA periods) rather than failing
completely? I.e. if ALSA reports that it supports requested small period -
excellent, use it. If not - pump-out 2*alsa_period audio data in advance to
ALSA and then continue feeding it with alsa_period data every alsa_period
elapses at the same time keeping firing up events every emulated mmdev_period.

P.S. Concerning monotonically increasing GetPosition(): by "monotonically" here
you mean standard math definition for term "monotonically" (i.e. derivative for
func is always greater or equal to zero)? To be more precise, it'd be more
correctly define GP as monotonically non-strictly increasing sequence - we're
in digital world here so there's no such thing as a real continuity here. If
you meant that - it's sort of documented in MSDN (quote from GetPosition()
docs, see remarks section): 
"... The device position is a stream-relative offset. ... Immediately following
creation of a new stream, the device position is 0. Following a call to the
IAudioClient::Start method, the device position increments at a uniform rate.
... Successive device readings are monotonically increasing. Although the
device position might not change between two successive readings, the device
position never decreases from one reading to the next. ...".

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