[LAU] HDSP 9632 - Just pcm0p !?

[Klaus Schulz]

THX Giso.

I already looked into the .asoundrc Wiki.  I couldn't really make sense of
it.

I 'll checkout Jack. I just wanted to avoid another layer in the chain. I
also didn't want to mix things
on the PC side. I didn't expect difficulties to send three stereo streams
straight to the device mixer.

For now the easiset solution I figured out would be to play a multichannel
wav:

sox -M 1.wav 2.wav 3.wav -t wavpcm - |  aplay -D plughw:0,0 -f cd

Cheers


On Mon, Oct 26, 2009 at 3:23 PM, Giso Grimm <gg3137 at vegri.net> wrote:

> Hi Klaus,
>
> the ALSA hardware device is just a single 18 channel (or whatever number
> of channels you have) device. The ALSA plughw-device does some mapping,
> which allows playback of different channel count on your multichannel
> card. The signal routing can be controlled in the ALSA settings (see
> 'route_policy').
>
> To simultaneously access the single device with different applications
> you should define a 'dmix' software device. I am not an expert on dmix
> settings, it is described on
>
> http://www.alsa-project.org/main/index.php/Asoundrc
>
> However, I did not find a documentation on how to setup multiple stereo
> devices with different output channels.
>
> All this is no problem at all with jack, simply connect any client to
> the channels you want (or route from client to client). Most
> applications support jack, so it should not be a problem. No GUI is
> needed (for headless setups).
>
> --
> Giso
>
>
> Klaus Schulz wrote:
> > Hi folks.
> >
> > On my quest to get  more then two channels from Alsa out to the 9632
> > I stepped over this:
> >
> > I figured that there is just a  pcm0p  under /proc/asound/card0.
> >
> > Shouldn't there be pcm0p...pcm7p reflecting the 8 Alsa stereo channels
> > on the HDSP?
> >
> > What am I mixing up here?
>
>
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