[MPlayer-users] 4-speaker support
steve at daviesfam.org
Mon Nov 19 16:26:51 CET 2001
Just saw this thread on >2 speaker analogue output.
I've just been looking at this right now.
"Stock" emu10k1 driver does as you say, Felix: sends the stereo pair to
both the front and read speaker outputs.
However - with the CVS OSS driver and the associated tools there's a
heap more "neat stuff" that can be done.
# password is cvsguest
cvs -z3 -d:pserver:cvsguest at opensource.creative.com:/usr/local/cvsroot login
cvs -z3 -d:pserver:cvsguest at opensource.creative.com:/usr/local/cvsroot co emu10k1
The functionality certainly includes at least mapping /dev/dsp1 to the
rear speakers. I presume the kernel driver will do this and you just need
the emu-dspmgr to make the mapping.
But since July, Eduard Hasenleithner implemented analogue multichannel
playback in the driver - which provides capability to drive all 6 analogue
output channels on the 5.1 card. At a cursory glance at the docs you call
SNDCTL_DSP_CHANNELS with (say) 6, and then you just write /dev/dsp with a
6 channel "interleaved" audio stream.
I'm certainly going to experiment with this - should enable ProLogic
decoding and 5.1 playback out of mplayer with no external kit, which would
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