On Tue, 24 Feb 2004, Jaroslav Kysela wrote:
> Here is the most optimized way to create three devices without mixing of
> all 10 channels which your hardware (ICE1712) has:
> pcm.dmixer12 {
> type dmix
> ipc_key 1024
> slave {
> pcm "hw:0,0"
> period_time 0
> period_size 1024
> buffer_size 6553
> rate 44100 # set to your source rate
> }
> bindings.0 0
> bindings.1 1
> }
>
> pcm.channel12 {
> type plug
> slave.pcm "dmixer12"
> }
>
> Explanation: The specified bindings also REDUCES the used channels (only
> destination channels are mixed). It's great speedup for your hardware.
>
> Also, note that if you don't want mix sources, you may replace 'plug dmix'
> with 'plug dshare'. It is also very good optimization.
Wow! This changed everything... here I have three MP3s playing to the
same output channel (for testing purposes). Not only does it sound
great and not skip like it was doing before, the CPU usage is next to
nothing:
30540 root 5 -20 2980 2980 2784 S < 3.5 0.7 0:04 mpg123
30566 root 4 -20 2480 2480 2284 S < 3.3 0.6 0:03 mpg123
30580 root 5 -20 2108 2108 1912 S < 3.1 0.5 0:02 mpg123
30567 root 12 0 1560 1300 1172 R 2.1 0.3 0:01 aplay
30541 root 11 0 1580 1320 1240 R 1.9 0.3 0:02 aplay
30581 root 13 0 1560 1300 1172 R 1.7 0.3 0:01 aplay
I tried everything I could do to get it to skip yet all three played to
completion without problems!
I'd like to understand a little about what you changed to make this work
so much better. Now each stereo output has its own mixer instead of
previously all outputs sharing a mixer? What does sharing a mixer do
for you?
And it seems that 'dshare' just allows the two channels to be used as a
pair and that is all? I can't play more than one stream to the same
output device using dshare, which I guess is why I use dmix! :)
I can't thank you enough! Here I was thinking I might have to buy a
dedicated computer just to play my MP3s!
--
Kirk Bauer <[EMAIL PROTECTED]>
http://linux.kaybee.org | www.autorpm.org | www.logwatch.org
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