[Bug 9358] Low latency interactive buffers are not mixed properly in directsound

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=9358





--- Comment #20 from Raymond <superquad.vortex2 at gmail.com>  2010-04-02 07:10:48 ---
(In reply to comment #19)
> If you set realtime priority, and really want the lowest latency wine doesn't
> officially support it. But these settings would help:
> 
> int ds_snd_queue_max = 10;
> int ds_snd_queue_min = 6;
> int ds_snd_shadow_maxsize = 2;
> 
> Change to 4, 4, and -1 in dsound_main.c
> 
> in primary.c you have a function called DSOUND_fraglen, change it to return 256
> instead of 512
> 
> That's probably about as low as it can get, tinkering with DSOUND_fraglen and
> ds_snd_queue_max is the only way to go lower than 90ms, but it's not officially
> supported. So do this at your own risk

For ALSA , the period_size of those PCI sound cards are multiple of PCI brust
size  , wine seem to use period_time of 10ms but those wave file are usually
22050 Hz or 44100 Hz ( multiple of 3 )

Seem like those numbers in DSOUND_Fraglen are magic number

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