Re: Playback using multiple devices

Christopher Brown <cabrown149@xxxxxxxxx> · Thu, 24 Feb 2022 01:34:03 +0000

         Hi
Again,

So I guess I am
looking for some closure on this. Can someone explain what the situation
is? Does multi-card no longer work? It clearly did at some point given the
prevalence of sample rc files around the web, but is this not the case
anymore? I need a multi-card setup for my work, and the ffado firewire
drivers for jack are troublesome at best for me on Manjaro. Any insights,
even if it is that it just doesn't work, would be
appreciated. 

Thanks,
Chris

Christopher Brown
wrote:

                       Hi List,

I have an updated Manjaro system and two RME Fireface 800
8-output-channel devices, both of which work well. I would like to create a
16-channel virtual device for playback, but I am having quite a bit of
difficulty. I have tried many things, but the closest I have come to
success seems to be with the following .asoundrc, which allows me to use
either ff800_1 or ff800_2 to playback sound with portaudio, but ff800x2
(the intended 16-channel virtual device) does not show up and thus is not
accessible. This config file was adapted with minimal edits from post #19
at  https://bbs.archlinux.org/viewtopic.php?id9370 which claims to
be a working example (although as posted it duplicated 2 audio channels out
to 4 hardware channels across 2 devices).

Any insights into what I am doing
wrong are greatly appreciated. 

## Begin .asoundrc
pcm.!default
plug:ff800x2

ctl.!default
{
  type hw
  card
0
}

pcm.ff800x2 {
  type route;
  slave.pcm {

type multi;
      slaves.a.pcm
"ff800_1";
      slaves.b.pcm
"ff800_2";
      slaves.a.channels
8;
      slaves.b.channels 8;

      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;

      bindings.0.slave
b;
      bindings.0.channel
0;
      bindings.1.slave b;
      bindings.1.channel 1;
      bindings.2.slave b;
      bindings.2.channel 2;
      bindings.3.slave b;
      bindings.3.channel 3;
      bindings.4.slave b;
      bindings.4.channel 4;
      bindings.5.slave b;
      bindings.5.channel 5;
      bindings.6.slave b;
      bindings.6.channel 6;
      bindings.7.slave b;
      bindings.7.channel 7;

  }

  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;
}

ctl.ff800x2
{
  type hw;
  card
0;
}

pcm.ff800_1 {
   type
dmix
   ipc_key 1024
   slave {

 pcm "hw:0"

 period_time 0

 period_size 1024

 buffer_size 16384
#     
 buffer_time 0
#     
 periods 128
       rate
44100
       channels 8
    }
    bindings
{
       0 0
       1 1

     2 2
       3
3
       4 4
       5 5

     6 6
       7
7
    }
}

pcm.ff800_2 {
   type dmix
   ipc_key
2048
   slave {

     pcm "hw:1"

 period_time 0

 period_size 1024

 buffer_size 65536
#     
 buffer_time 0
#     
 periods 128
       rate
44100
       channels 8
    }
    bindings
{
       0 0
       1 1

     2 2
       3
3
       4 4
       5 5

     6 6
       7
7
    }
}

ctl.ff800_1 {
   type hw
   card
0
}

ctl.ff800_2 {
   type
hw
   card 1
}
## End
.asoundrc

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