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