Re: [linux-audio-user] Multiple Cards(sorry, i know it's an ancient topic)

paul santa clara wrote:

> Hi everyone,
> I am attempting to utilize my asound.conf to create a virtual
> interface out of two delta 410 cards. There are several examples of
> this online, but even after digesting them and plunging into the ALSA
> doxygen docs, i am still unable to make jackd happy. My
> understanding is that a route plug is inefficient but necessary for
> jack to lock down the memory(unless the MMAP_COMPLEX patch is
> applied). Using jack 0.99.0
>
> jackd -v -d alsa -P ttable_play results in the error...
> ALSA lib pcm_multi.c:970:(_snd_pcm_multi_open) Unknown field 10
> ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to
> capture-only mode.
>
> The playback portion of my asound.conf follows. Any help would be
> greatly appreciated. I actually thought I understood the
> configuration process until it failed to work. ;)
>
> thanks in advance,
> -paul
>
> pcm.multi_playback {
> type multi
> slaves.a.pcm hw:1 <---------------------- "hw:0"?
> slaves.a.pcm channels 10
> slaves.b.pcm hw:2 <---------------------- "hw:1"?
> slaves.b.pcm channels 10
> #note that ice1217 chip actually has 10 outs(8 analogue on 410)

I don't know much about .asoundrc configuration, but should the "hw"
index start at 0?

Rick

>
> #first 8 analogue channels of FIRST 410
> #bindings . virtual channel
> bindings.0.slave a
> bindings.0.channel 0
> bindings.1.slave a
> bindings.1.channel 1
> bindings.2.slave a
> bindings.2.channel 2
> bindings.3.slave a
> bindings.3.channel 3
> bindings.4.slave a
> bindings.4.channel 4
> bindings.5.slave a
> bindings.5.channel 5
> bindings.6.slave a
> bindings.6.channel 6
> bindings.7.slave a
> bindings.7.channel 7
>
> #first 8 analogue channels of SECOND 410
> bindings.8.slave b
> bindings.8.channel 0
> bindings.9.slave b
> bindings.9.channel 1
> bindings.10.slave b
> bindings.10.channel 2
> bindings.11.slave b
> bindings.11.channel 3
> bindings.12.slave b
> bindings.12.channel 4
> bindings.13.slave b
> bindings.13.channel 5
> bindings.14.slave b
> bindings.14.channel 6
> bindings.15.slave b
> bindings.15.channel 7
>
> #SPDIF 1st 410
> # bindings.16.slave a
> # bindings.16.channel 8
> # bindings.17.slave a
> # bindings.17.channel 9
>
> #SPDIF 2nd 410
> # bindings.18.slave b
> # bindings.18.channel 8
> # bindings.19.slave b
> # bindings.19.channel 9
>
> }
> #end pcm.multiplayback
>
> ctl.multi_playback {
> type hw
> card 0
> }
>
> #interleave playback channels
> #slow but required by JACK
> pcm.ttable_play {
> type route
> slave.pcm "multi_playback"
> ttable.0.0 1
> ttable.1.1 1
> ttable.2.2 1
> ttable.3.3 1
> ttable.4.4 1
> ttable.5.5 1
> ttable.6.6 1
> ttable.7.7 1
> ttable.8.8 1
> ttable.9.9 1
> ttable.10.10 1
> ttable.11.11 1
> ttable.12.12 1
> ttable.13.13 1
> ttable.14.14 1
> ttable.15.15 1
> #SPDIF playback
> # ttable.16.16 1
> # ttable.17.17 1
> }
> #END pcm.ttable_play
>
> ctl.ttable_play {
> type hw
> card 0
> }
>
>
>
>
>
Received on Wed May 24 16:15:02 2006