[Bug 30639] Audio stuttering and performance drops in Star Wolves 3

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=30639

--- Comment #2 from Andrew Eikum <aeikum at codeweavers.com> 2012-05-10 13:26:57 CDT ---
(In reply to comment #1)
> I.e. there are the following possible improvements in Wine without sacrificing
> sound quality:
> 
> 1) Group secondary buffers by sample rate. Mix each group separately, resample
> only the result, then mix the result of resampling.
> 

This is a good idea, and shouldn't be too hard. I'll give it a close look,
though it will have to wait until after the rest of my cleanup patches are in.

> 2) Return a non-zero CPU cost of mixing, in hope that an application will
> create less streams to mix.
> 

I'd be very surprised if there were more than one or two applications that
actually use that parameter. Not a bad idea on principle, but I doubt it will
help.

> 3) Recompile dlls/dsound with -O3 -ffast-math -msse3 in CFLAGS.
> 

Strikes me as a good idea. Are you still planning to work on this, Alexander?
I'd be interested to hear results from GyB if these flags improve things

> 4) Try to imitate the Windows way of selecting the primary buffer sample rate
> more thoroughly (I.e. I guess that the default sample rate should not exist).
> If that fails and the app didn't set an explicit rate, just set it to the
> sample rate of the first secondary buffer, even though this violates the spec.
> 

This is worth experimenting with, but creating heuristics that work well is
always tricky (e.g. which rate to choose, what to do if the preferred rate
changes while playing, etc).

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