Hi Istvan,

I haven't tried different device names, simply using "-o dac", nor
have tried any other sample rates or channels.  I'll try taking a look
at rtalsa.c and alsa headers tonight to see if I can discover
anything.

Thanks!
steven


On 8/29/05, Istvan Varga <istvan_v@fibermail.hu> 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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