Hello,
I've been playing around a bit with splitting up the outputs on a
motherboard I have to obtain separate stereo pairs. It is AC97-based,
with the STAC9758 codec. After searching around for a bit, I came
across an asoundrc (from the ALSA wiki) that worked (mostly), at the
bottom of the email.
A problem that I've come across is when I seek around with the player
I'm using (XMMS and a test player library), the sounds 'bunch up' on top
of each other. That is, when I configure XMMS for 'frontx' or 'rearx'.
When I configure it for hw:0,0 it does not behave this way, and drops
the samples in the buffer (snd_pcm_drop) before playing the new data.
I can see how dmix might not be able to drop samples, as it would need
to 'undo' the mixing of samples from a particular source (probably time
consuming). dshare looked like it might be more appropriate, but I
haven't been able to use it in my configuration correctly. I either get
playback devices that don't work from being configured incorrectly, or
devices that tie up all of the channels.
I am using Ubuntu Feisty Fawn. I'm going to play with Jack for a bit
too, to see if that changes the behavior.
Thanks in advance,
Ron
---
.asoundrc:
pcm.multi {
type dmix
ipc_key 15152
slave {
pcm "hw:0,0"
rate 48000
period_time 0
period_size 1024
buffer_size 8192
channels 4
}
bindings {
0 0
1 1
2 2
3 3
}
}
pcm.frontx {
type plug
slave.pcm "multi"
ttable.0.0 1
ttable.1.1 1
}
pcm.rearx {
type plug
slave.pcm "multi"
ttable.0.2 1
ttable.1.3 1
}
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