However once I started to explore the realm of 5.1 surround things got alot more confusing and less satisfactory.
So far i have determined that for this sound card, "hw:0,0" or pcm0p is the "primary" pcm device and seems to be two channels only. Playing a DVD in XINE using the default "surround51" device, I explored the hw_params of the various playback pcms listed and figured that "hw:0,1" or pcm1p is used for 5.1 surround.
Now, here's the problem. If the programs I want to use are just desktop type programs (GAIM, Mozilla, XMMS for 2 channel music), having dmix setup on hw:0,0 is perfectly sufficient - I can tell alsa-aware programs to use the dmix device, and the "aoss" wrapper seems to work well for everything else.
But I quickly discovered that if I'm doing any dmix-2-channel-stuff, I can't watch dvds in 5.1, and vice versa.
First question is - is that normal behavior? It seems that if surround51 uses "hw:0,1" and 2 channel stuff uses "hw:0,0", there shouldn't be any conflict REGARDLESS of dmix. What's the deal here?
And second question - I know that dmix only supports 2 channels. However, is there anyway to split the channels of surround51 into 3 sets of 2 channels, dmix each set of 2, then recombine the dmixed channels into one virtual 6-channel device?
I tried a few different ways of accomplishing #2, with no success. My current best effort is as follows - (/etc/asound.conf)
pcm.dmix01 {
type dmix
ipc_key 1024
slave {
pcm "hw:0,1"
period_time 0
period_size 1024
buffer_size 4096
rate 48000
}bindings.0 0 bindings.1 1 }
pcm.dmix23 {
type dmix
ipc_key 1024
slave {
pcm "hw:0,1"
period_time 0
period_size 1024
buffer_size 4096
rate 48000
}bindings.0 2 bindings.1 3 }
pcm.dmix45 {
type dmix
ipc_key 1024
slave {
pcm "hw:0,1"
period_time 0
period_size 1024
buffer_size 4096
rate 48000
}bindings.0 4 bindings.1 5 }
pcm.dmixs51 {
type multi
slaves.a.pcm "dmix01"
slaves.a.channels 2
slaves.b.pcm "dmix23"
slaves.b.channels 2
slaves.c.pcm "dmix45"
slaves.c.channels 2bindings.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 bindings.4.slave c bindings.4.channel 0 bindings.5.slave c bindings.5.channel 1
}
pcm.s51 {
type plug
slave {
pcm "dmixs51"
channels 6
rate 48000
}ttable.0.0 1 ttable.1.1 1 ttable.2.2 1 ttable.3.3 1 ttable.4.4 1 ttable.5.5 1 }
Any help or insight with this dilemma would be much appreciated - I'd much rather keep using my built-in sound than slap in an SBlive5.1. That would involve a shutdown and ruining my glorious uptime. ;)
tia
-Brady
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