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

[Rui Nuno Capela]

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 at rncbc.org