[Bug 27937] winmm kept busy playing silence after play finishes

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=27937

--- Comment #7 from Raymond <superquad.vortex2 at gmail.com> 2011-09-24 18:28:18 CDT ---
Created attachment 36537
  --> http://bugs.winehq.org/attachment.cgi?id=36537
Test playback/capture position





(In reply to comment #1)
>
> After playing for 1 second, GetPosition cannot be farther than nSamplesPerSec.
> The bug in Wine is that it's based on snd_pcm_avail_update, which is about
> buffer space, instead of snd_pcm_delay.
> 
> With dmix, it's funny that GetPosition is initially too far ahead but then
> calms down (see below).  That's because there's no further buffering.
> 
> With PulseAudio, GetPosition yields values far away in the future.  That alone
> explains why any app that tries to sync audio and video creates a huge lag.
> It's not the fault of PulseAudio.
> 


pulse plugin seem only update pointer at the selected period time.

so the playback/capture position is less inaccurate than those plug:dmix or hw
for hda-intel


you can use the attach program to print the playback/capture position of 
different device (e.g. hw, plug:dmix, pulse, plughw, plug:jack)


 alsa_test device dir rate periods stop_at_underrun silence

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