[PlanetCCRMA] Re: El-cheapo: How to test 3 cards simultaneously?

[Mark Knecht]

Timo,
   I agree with Rui. Post this on Alsa-User or Alsa-Devel. I've tried
to get multi devices working and never been able to grasp the
language. Jaroslav will likely step in and see what's wrong pretty
quickly.

Good luck,
Mark


On Wed, 24 Nov 2004 13:36:18 -0000 (WET), Rui Nuno Capela
<rncbc@rncbc.org> wrote:
> Timo Sivula wrote:
> 
> 
> >
> > Rui Nuno Capela wrote:
> >
> >> Most probably, you'll have to change the driver interface name to the
> >> one you inscribed on your asoundrc file, instead of "hw:0", "hw:1" nor
> >> "hw:2", which referr to each individual card device.
> >>
> >> I'm only catching the topic this time, but I guess you had to do a
> >> special asoundrc configuration to gang your three cards, hadn't you?
> >
> > Yes, but it never worked, this is what I get:
> >
> > - clip clip -
> >
> > localhost:/etc$ jackstart -R -dalsa -dttable -r44100 -p128 -n3 -S back
> > from read, ret = 1 errno == Success
> > jackd 0.99.0
> > Copyright 2001-2003 Paul Davis and others.
> > jackd comes with ABSOLUTELY NO WARRANTY
> > This is free software, and you are welcome to redistribute it
> > under certain conditions; see the file COPYING for details
> >
> > loading driver ..
> > apparent rate = 44100
> > creating alsa driver ...
> > ttable|ttable|128|3|44100|0|0|nomon|swmeter|-|16bit
> > configuring for 44100Hz, period = 128 frames, buffer = 3 periods
> > You appear to be using the ALSA software "plug" layer, probably
> > a result of using the "default" ALSA device. This is less
> > efficient than it could be. Consider using a hardware device
> > instead rather than using the plug layer. Usually the name of the
> > hardware device that corresponds to the first soun
> > You appear to be using the ALSA software "plug" layer, probably
> > a result of using the "default" ALSA device. This is less
> > efficient than it could be. Consider using a hardware device
> > instead rather than using the plug layer. Usually the name of the
> > hardware device that corresponds to the first soun
> > ALSA lib pcm.c:1178:(snd_pcm_link) SNDRV_PCM_IOCTL_LINK failed:
> > Operation already in progress
> > jackstart: pcm.c:5957: snd_pcm_mmap_commit: Assertion `frames <=
> > snd_pcm_mmap_avail(pcm)' failed.
> >
> > - clipeticlip -
> >
> > My /etc/asound.conf looks like this:
> >
> > - clip clip -
> > pcm.multi {
> >         type plug
> >         slave.pcm {
> >                 type multi
> >                 slaves.a {
> >                         pcm "hw:0"
> >                         channels 2
> >                 }
> >                 slaves.b {
> >                         pcm "hw:1"
> >                         channels 2
> >                 }
> >                 slaves.c {
> >                         pcm "hw:2"
> >                         channels 2
> >                 }
> >                 bindings [
> >                         { slave a channel 0 }
> >                         { slave a channel 1 }
> >                         { slave b channel 0 }
> >                         { slave b channel 1 }
> >                         { slave c channel 0 }
> >                         { slave c channel 1 }
> >                 ]
> >         }
> > }
> > ctl.multi {
> >         type hw;
> >         card 0;
> > }
> > pcm.ttable {
> >         type route;
> >         slave.pcm "multi";
> >         ttable.0.0 1;
> >         ttable.1.1 1;
> >         ttable.2.2 1;
> >         ttable.3.3 1;
> >         ttable.4.4 1;
> >         ttable.5.5 1;
> > }
> >
> > ctl.ttable {
> >         type hw;
> >         card 0;
> > }
> >
> > - clipeti clip -
> >
> > As my cards use a common crystal they should be clocksynced. What could
> > be wrong?
> >
> 
> Certainly a question to post on the jackit-devel and alsa-user lists.
> Maybe someone out there may have some experience on this. I'm far from an
> asoundrc expert -- in fact, I try to stay away from it, at a far and
> secure distance ;)
> 
> Sorry.
> --
> 
> 
> rncbc aka Rui Nuno Capela
> rncbc@rncbc.org
> 
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