[alsa-devel] dmix and sounds less than 64kb

[Jaroslav Kysela]

On Mon, 9 Jul 2007, Aaron "Caustik" Robinson wrote:

> We actually dumped the pcm data as it was arriving to the driver (via the
> trigger start and irq functions), and it was corrupted at that point. Also I
> have dumped the pcm data after it has been mixed by the dmix plugin, and it
> is fine there as well.

Which hardware and driver? It seems like a driver (wrong pointer 
management) or hardware issue. For example, ARM CPUs does not guarantee 
cache coherency between two virtual address spaces pointing to one 
physical space.

					Jaroslav

> On 7/9/07, Takashi Iwai <tiwai at suse.de> wrote:
> >
> > At Fri, 6 Jul 2007 20:28:13 -0700,
> > Aaron "Caustik" Robinson wrote:
> > >
> > > We have been having one heck of a time tracking down the cause of some
> > ALSA
> > > audio playback issues.
> > >
> > > It appears that any time we play a very short sound (<64kb), either the
> > > sound doesn't play at all, or only a fragment of it plays. We haven't
> > had
> > > much luck finding a solution to this issue, then I found this thread on
> > the
> > > history of this email group:
> > >
> > >
> > http://mailman.alsa-project.org/pipermail/alsa-devel/2007-April/000526.html
> > >
> > > Our problem is pretty much exactly like his issues relating to <64k
> > sounds.
> > >
> > > My question is - has anybody else run into this problem? To the OP of
> > the
> > > above thread, if you're still listening - did you ever find a solution
> > to
> > > your problem? I'd be very interested to hear any help you can provide.
> >
> > It works fine with my systems, so the problem should be pretty
> > driver-specific...

-----
Jaroslav Kysela <perex at suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs