Hi
I have a SB Audigy Value card with 5.1 channel output. This is defined
in my asound.conf:
---------------------------
pcm.multi {
type multi
slaves {
a.pcm "dmixerrear"
a.channels 2
b.pcm "dmixerfront"
b.channels 2
c.pcm "dmixercenter"
c.channels 2
}
bindings {
0.slave a
0.channel 0
1.slave a
1.channel 1
2.slave b
2.channel 0
3.slave b
3.channel 1
4.slave c
4.channel 0
5.slave c
5.channel 1
}
}
pcm.dmixerfront {
type dmix
ipc_key 1024
slave {
pcm "hw:0,0"
channels 2
}
}
pcm.dmixerrear {
type dmix
ipc_key 1025
slave {
pcm "hw:0,1"
channels 2
}
}
pcm.dmixercenter {
type dmix
ipc_key 1026
slave {
pcm "hw:0,2"
channels 2
}
}
---------------------------
Playing a video with "mplayer -ao alsa:device=multi ..." works fine, I
can hear the 6-channel audio without any A/V sync issues. However,
this is on a uniprocessor system. On an SMP system, the A/V sync gets
out of sync from the start and drifts quite quickly.
I have narrowed it down to the pcm_multi component giving this
problem. On an SMP system, using just "mplayer -ao alsa ..." gives no
A/V sync issues (because it is not using multi) on the 6 channels.
Moreover, I have also tried "mplayer -ao alsa:device=dmixerfront ...",
"mplayer -ao alsa:device=dmixercenter ..." and "mplayer -ao
alsa:device=dmixerrear ...", all giving no A/V sync issues on the
individual devices.
Please advise how can I track down this problem in code, happy to make
changes and test.
PS: I need multi to work, so that I can add additional options like
softvol on top of it.
Regards
Keith
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