Well, not much progress last night.  I read this today:

http://www.reactivated.net/weblog/archives/2005/06/linux-2612/

And seems that DMIX is enabled by default.  Could this possibly cause
problems setting buffer sizes?  (I'm not using an .asoundrc file, btw)

Anyways, will continue to search for info.  What does everyone think
of if instead of failing if the buffer_size is not settable, to just
log an error to the output to notify the user but to continue working?
 (I'm assuming if setting fails it just defaults to a deafult buffer
size).

steven


On 8/29/05, Steven Yi <stevenyi@gmail.com> wrote:
> Hi Dave,
> 
> This is precisely the combination I have.  I'm using Fedora Core 4
> with Planet-CCRMA.  If I use ALSA 1.0.9 from CCRMA or atrpms, I end up
> having problems altogether, but I think I'm using the ALSA rpm's from
> newrpms (have to check when I get home).  As it is now, I can use
> Amaraok and XMMS, play files from the commandline using play, and use
> the portaudio plugin with Csound.  (Now that I think of it though, I'm
> not sure if I've recompiled PortAudio v19 from source since moving
> over to FC4, so wonder if that is what is allowing that to continue to
> work...?).
> 
> I'll experiment tonight to see if I can figure out anything.  What
> problems did you have with 1.0.9 and 2.6.12, and what did you end up
> doing to resolve it?
> 
> steven
> 
> 
> On 8/29/05, Dave Phillips <dlphillips@woh.rr.com> wrote:
> > Greetings:
> >
> >   I must note that I had a world of problems with ALSA 1.0.9 + kernel
> > 2.6.12. Steven, are you using a package-based distro ? Does your sound
> > hardware load correctly, and does it work all right with other apps ?
> >
> > Best,
> >
> > dp
> >
> >
> >
> > Istvan Varga wrote:
> >
> > > Steven Yi wrote:
> > >
> > >> I recently updated to Fedora Core 4 and with that upgraded my ALSA
> > >> libs to 1.0.9 (was previously using 1.0.6).  It seems that now I am
> > >> unable to use -+rtaudio=alsa as Csound will fail with:
> > >>
> > >>  *** Failed while trying to set soundcard DMA buffer size
> > >> Failed to initialise real time audio output
> > >>
> > >> I have -b64 -B256 set, using --expression-opt and -m0 -d normally.  My
> > >> settings all worked before switching to FC4 and the new alsa libs.
> > >> The Portaudio plugin seems to work alright, but would rather prefer to
> > >> use the ALSA plugin. I've tried various combinations of -b and -B as
> > >> well, without much luck.
> > >
> > >
> > > I only have ALSA 1.0.6 at this time, so some system upgrade is needed
> > > to have an attempt at fixing this problem, unless there was an obvious
> > > incompatible change in the ALSA API that broke the code below:
> > >
> > >     /* buffer size, */
> > >     if (dev->buffer_smps == 0) dev->buffer_smps = 1024;
> > >     if (dev->buffer_smps < 64) dev->buffer_smps = 64;
> > >     if (snd_pcm_hw_params_set_buffer_size(dev->handle, hw_params,
> > >                                           (snd_pcm_uframes_t)
> > > dev->buffer_smps)
> > >         < 0) {
> > >       sprintf(msg, " *** Failed while trying to set soundcard "
> > >                    "DMA buffer size\n");
> > >       goto err_return_msg;
> > >     }
> > >
> > > By the way, did you try using different device names ? Does the error
> > > occur with all devices, and using any sample rate and number of
> > > channels ?
> > >
> > >
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