[alsa-devel] [PATCH] Alsa-plugins: Pulse: Fix snd_pcm_avail returning 0 in some cases
tiwai at suse.de
Tue Apr 26 16:39:40 CEST 2011
At Tue, 26 Apr 2011 10:01:23 +0200,
David Henningsson wrote:
> On 2011-04-22 01:25, Raymond Yau wrote:
> > 2011/4/21 David Henningsson<david.henningsson at canonical.com>
> >> Due to a round-off error, snd_pcm_avail could in some cases
> >> return 0 even though more data could be written to the stream.
> >> This was discovered by Maarten Lankhorst , and there is also a test
> >> program available that triggers this error .
> >> 
> >> https://tango.0pointer.de/pipermail/pulseaudio-discuss/2011-April/009935.html
> >> 
> >> https://tango.0pointer.de/pipermail/pulseaudio-discuss/attachments/20110420/3c852d6e/attachment.c
> > if the test program can force under-run occur with "hw" device and "pulse"
> > device with his patch in
> > https://tango.0pointer.de/pipermail/pulseaudio-discuss/2011-April/009918.html
> > Is it normal that underrun does not occur with the test program and your
> > patch
> Yes; underruns are not reported to the application due to the risk of
> the underrun being obsolete at that time. As for Maarten's patch in the
> post you refer to,
> 1) if underruns are being reported (this is configurable), it might be a
> good idea to call "pulse_start".
> 2) it changes underruns to being reported by default, which is what I'm
> opposed to.
Applied now. Thanks.
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