On Sun, 14 Sep 2008, Lars Magne Ingebrigtsen wrote:
> I've been googling a bit for how to output the same sound on two sound
> cards, and have found some bits, but I just can't get it to work with my
> setup.
Not sure what you mean "to work" If by that you want the two sound sources
perfectly synchronized, that will probably be impossible. If noting else
the two chips on the two sound cards run at different speeds so even if you
start out synchronized you will fall out after a while. Plus there are
different latencies in the two cards, etc.
>
> I have two sound cards; one RME9652, and one built-in VIA thing. The
> RME is connected to the stereo via S/PDIF, and the VIA thing is
> connected to a wireless transmitter.
>
> This is the RME setup from .asoundrc:
>
> pcm.rme9652 {
> type plug
> slave {
> pcm hw:0;
> }
> route_policy copy
> ttable.0.16 1
> ttable.1.17 1
> }
>
> 16/17 are the S/PDIF outputs.
>
> The VIA setup is much simpler:
>
> pcm.via {
> type hw;
> card 1;
> }
>
> Both work perfectly when using mpg123 with -a rme9652 or via.
>
> So I tried with this multi setup:
>
> pcm.multi {
> type multi;
> slaves.a.pcm rme9652;
> slaves.a.channels 26;
> slaves.b.pcm via;
> slaves.b.channels 2;
> bindings.0.slave a;
> bindings.0.channel 0;
> bindings.1.slave a;
> bindings.1.channel 1;
> bindings.2.slave b;
> bindings.2.channel 0;
> bindings.3.slave b;
> bindings.3.channel 1;
> }
>
> pcm.ttable {
> type route;
> slave.pcm "multi";
> ttable.0.0 1;
> ttable.1.1 1;
> ttable.0.2 1;
> ttable.1.3 1;
> }
>
> That is, I create a multi device with four channels, and then I create a
> routing device that has two inputs that outputs to the four inputs from
> the multi device.
>
> When trying to play anything, I get this:
>
> ----------------
> [larsi@rocket-sam ~]$ /usr/local/src/mpg123-0.61/src/mpg123 -a ttable /music/repository/Arto\ Lindsay/Prize/01-Ondina.mp3
> High Performance MPEG 1.0/2.0/2.5 Audio Player for Layers 1, 2 and 3
> version 0.61; written and copyright by Michael Hipp and others
> free software (LGPL/GPL) without any warranty but with best wishes
>
> Directory: /music/repository/Arto Lindsay/Prize/
> Playing MPEG stream 1 of 1: 01-Ondina.mp3 ...
> MPEG 1.0 layer III, 256 kbits/s, 44100 Hz joint-stereo
> [audio.c:264] error: No supported rate found!
> ----------------
>
> I've tried other combinations of setups, and I'm able to create a multi
> device over the VIA device, and I'm able to create a multi device over
> the RME device, but then I don't get any sound output whatsoever.
>
> Am I misunderstanding how this is supposed to work?
>
>
--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/
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