16 Oct
2003
16 Oct
'03
8:39 a.m.
Mark Knecht wrote:
What would be great, if it can be done, is to
create a sort of
'virtual OSS' device in .asoundrc that only drove specific Alsa playback
channels, so that Mozilla, for instance, talked to a specific entry in
.asoundrc and ended up only driving two specific playback channels, like
playback_22 and playback_23.
pcm_slave.hdsp {
pcm "hw:0" # or whatever number it is
channels 26
}
pcm.playback_22_23 {
type dshare
slave hdsp
ipc_key 314159265 # some unique number
ipc_key_add_uid yes # "no" to let multiple users share it
bindings {
0 22
1 23
}
}
Now you have a stereo device for channels 22+23, use it like
"aplay -Dplayback_22_23 something.wav". Define some other pcms to be
able to use the other channels at the same time.
To access this from OSS programs, define a pcm named "dsp0":
pcm.dsp0 {
type plug
slave.pcm playback_22_23
}
and start your OSS program with the aoss script from the alsa-oss
package.
HTH
Clemens