[alsa-devel] Which project to choose?

[Raymond Yau]

2010/7/14 David Henningsson <launchpad.web at epost.diwic.se>

> 2010-07-14 13:13, Raymond Yau skrev:
>
> > localhost pulseaudio[24553]: alsa-util.c:   appl_ptr     : 735801008
> > localhost pulseaudio[24553]: alsa-util.c:   hw_ptr       : 735846184
> >
> > This is underrun as you can see appl_ptr is behing hw_ptr
>
> Ehm, isn't that a ring buffer? I e, there is nothing wrong with appl_ptr
> being less than hw_ptr.
>

I think Jaroslav Kysela had already explained to you that this is an
underrun

The ring buffer size is only 4408 , appl_ptr is 45176 frames behind hw_ptr
and you can deduce the underrun occur for more than 1 second (45176/44100)

>> pulseaudio[24553]: alsa-util.c: snd_pcm_delay() returned a value that is
exceptionally large: -161920 bytes (-917 ms).



localhost pulseaudio[24553]: alsa-util.c:   buffer_size  : 4408
localhost pulseaudio[24553]: alsa-util.c:   period_size  : 1102
localhost pulseaudio[24553]: alsa-util.c:   period_time  : 24988

...

localhost pulseaudio[24553]: alsa-util.c:   start_threshold  : -1
localhost pulseaudio[24553]: alsa-util.c:   stop_threshold   :
1155530752



> > However PA server had disabled the underrun detection.
>
> Please clarify. If you're talking about my patch (disable underruns in
> alsa-plugins) here, it has nothing to do with this situation (PA
> complaining about its back-end).
>
>
This seem has no relationship to your patch which only ignore the client
side underrun

The PA server has already disabled underrun detection ( no-XRUN check mode )

http://thread.gmane.org/gmane.linux.alsa.devel/60371/focus=60531

It is the responsibility of PA server to ensure underrun/overrun would not
occur on the sound driver if it disabled underrun  detection