assound.conf

pcm.!dmix {
type dmix
ipc_key 5678293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}
pcm.!dsnoop {
type dsnoop
ipc_key 5778293
ipc_key_add_uid yes
slave {
pcm "hw:0,0"
period_time 0
period_size 2048
buffer_size 16384
format S16_LE
rate 48000
}
}

pcm.asymed {
type asym
playback.pcm "dmix"
capture.pcm "dsnoop"
}

pcm.!default {
type plug
slave.pcm "asymed"
}

pcm.dsp0 {
type plug
slave.pcm "asymed"
}

ctl.mixer0 {
type hw
card 0
}

assound.conf

原文：http://www.cnblogs.com/cainiaoaixuexi/p/3949943.html