> Replace "plughw:0" with "dmix:0". This will give you the two channels
> of the standard dmix device; if you want to output four channels, you
> also have to redefine the dmix device used by "default".
Hi,
I've rewritten my device definition as follows:
pcm.51to21 {
type route
slave {
pcm "dmix:0"
}
# Front and rear, at 33% of original signal strength
ttable.0.0 0.58
ttable.1.1 0.58
ttable.2.0 0.58
ttable.3.1 0.58
# Centre channel routing (routed to front-left and front-right),
# 6dB gaindrop (gain half of main channels) per channel
ttable.4.0 0.57
ttable.4.1 0.57
ttable.5.2 1
}
However, the dmix:0 device doesn't seem to be able to share the hardware either! I still have to wait about 5 seconds for the "default" device to release the hardware in order to avoid this error:
$ aplay -Dplug:51to21 receive.wav
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave
aplay: main:682: audio open error: Device or resource busy
Isn't the dmix device supposed to be sharable? Or am I misunderstanding what the dmix plugin is supposed to do? I was expecting the following to play the same WAV file twice, simultaneously:
$ aplay -Dplug:51to21 receive.wav & aplay receive.wav
However, it actually serialises them both instead.
Thanks for any advice here,
Cheers,
Chris
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