Hi there,
I'm trying to get a multi device working with dmix. Specifically, I'm trying to
do the following:
My laptop's soundcard (driver: SND_INTEL8X0, compiled into the kernel, version
2.6.17) has an analogue (hw:0,0) and a digital (hw:0,4) device that use the
same physical output jack. What I want now is, when I unplug the optical wire,
the built-in laptop speaker start to work. I successfully achieved this by
adding:
pcm.multi {
type multi
slaves.a.pcm "hw:0,0"
slaves.a.channels 2
slaves.b.pcm "hw:0,4"
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
}
to /etc/asound.conf file and then play a file by doing:
aplay -D plug:multi some_audio_file.wav
That way, as far as I understand this, it simply plays on both devices
simultaneously. The laptop mutes the built-in speakers, when something is
plugged into the audio out jack. Hence, everything works as it should work (
i.e. playing audio over the digital device as long as the optical wire is
connected and on unplugging, the built-in speakers are playing)
So now my question: I want to use the dmix plugin for this configuration, but I
can only make it work for a single device:
pcm.!default {
type plug
slave.pcm "dmixer"
}
pcm.dmixer {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
period_time 0
period_size 1024
buffer_size 4096
rate 44100
}
bindings {
0 0
1 1
}
}
ctl.dmixer {
type hw
card 0
}
Unfortunately, I cannot add somthing like: "plug:multi" in the slave section of
"pcm.dmixer". When trying to do this, I get:
ALSA lib pcm_dmix.c:867:(snd_pcm_dmix_open) dmix plugin can be only connected
to hw plugin
Thus, i does not seem to work, BUT: I read in a recent changelog for alsa-lib
(1.0.10->1.0.11):
- Support multi-card/device for direct plugins
- Support multi-card/device for dmix/dsnoop/dshare plugins
The unique ipc key is calculated based on card/device/sub index
- Clean up and share the code among all d* plugins
- Refer the defaults.pcm.* configuration
The base ipc_key number, ipc_gid and ipc_perm are referred.
I understand, that it is now possible to do this sort of thing I'm looking for,
is that right? And if so, how? I tried hours to make it work, but no success so
far. The documentation file for asound.rc shipped with alsa-lib is older than
one year...
Thanks in advance
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