Bug#536896: linux-image-2.6.26-2-amd64: audio popping with gstreamer using apps when using amd64 kernel and i386 userspace

[James Andrewartha]

On Mon, 12 Apr 2010, Ben Hutchings wrote:

> On Mon, 2010-04-12 at 09:26 +0200, Takashi Iwai wrote:
> > At Sun, 11 Apr 2010 21:25:16 +0100,
> > Ben Hutchings wrote:
> > > 
> > > [1  <text/plain; UTF-8 (quoted-printable)>]
> > > [Earlier messages can be found at http://bugs.debian.org/536896 ]
> > > 
> > > On Mon, 2010-04-12 at 01:08 +0800, James Andrewartha wrote:
> [...]
> > > > Author: Takashi Iwai <tiwai at suse.de>  2008-01-09 02:08:14
> > > > Committer: Jaroslav Kysela <perex at perex.cz>  2008-02-01 01:29:47
> > > > Parent: d948035a928400ae127c873fbf771389bee18949 ([ALSA] Remove PCM xfer_align sw params)
> > > > 
> > > >     [ALSA] PCM - clean up snd_pcm_lib_read/write
> > > >     
> > > >     Introduce a common helper function for snd_pcm_lib_read and snd_pcm_lib_write
> > > >     for cleaning up the code.
> > > >     
> > > >     Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > > >     Signed-off-by: Jaroslav Kysela <perex at perex.cz>
> > > > 
> > > > I don't know anything about this code, but I'm happy to deal with upstream 
> > > > if you'd prefer me to.
> > > 
> > > The above commit is supposed to be cleanup, but it has at least one
> > > semantic change: snd_pcm_mmap_control::avail_min no longer applies to
> > > non-blocking file handles.  I don't know whether this is was an
> > > intentional or unintentional change, but it wasn't commented.  I also
> > > don't know whether this can explain the popping, but I expect that it
> > > has changed the timing of audio I/O.
> > 
> > The above change is essentially a fix of the buggy behavior for
> > non-blocking access.  avail_min is the definition for wake-up
> > behavior, and it doesn't define the blocking behavior.
> > But, it's possible that this changes the timing, indeed.  If so, it
> > implies that the app expects somehow wrongly.
> 
> Thanks for your quick response.  I will reassign this bug to the
> applications that were mentioned.

I've tested totem from squeeze in a chroot and it still occurs, so it 
hasn't been fixed there.

ii  totem                       2.28.5-3                    A simple media player for the GNOME desktop based on GStreamer
ii  gstreamer0.10-alsa          0.10.28-1                   GStreamer plugin for ALSA
ii  gstreamer0.10-plugins-good  0.10.21-1                   GStreamer plugins from the "good" set
ii  libgstreamer-plugins-base0. 0.10.28-1                   GStreamer libraries from the "base" set
ii  libgstreamer0.10-0          0.10.28-1                   Core GStreamer libraries and elements


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