On Tue, 24 Feb 2004, Jaroslav Kysela wrote:
> On Mon, 23 Feb 2004, Kirk Bauer wrote:
>
> > I have a M-Audio Delta 410 and I seem to have it working in 4xstereo
> > mode. Now I'm trying to refine my technique, as right now the only way
> > I know to send MP3s to a specific device (or channel) is:
> >
> > mpg123 -s test.mp3 | aplay --device=channel2 --channels=2 -f cd
> > --buffer-time=1000000 -
> >
> > But the problem is that aplay takes up a huge amount of CPU time. Here
> > is output from 'top' with two such processes running on different
> > channels:
> >
> > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> > 4229 root 15 0 1876 1616 1476 R 32.6 0.4 0:38 aplay
> > 4235 root 15 0 1876 1616 1476 R 30.6 0.4 0:38 aplay
> > 4228 root 0 -20 3500 3500 3304 S < 5.5 0.9 0:06 mpg123
> > 4234 root 0 -20 3436 3436 3240 S < 4.7 0.8 0:05 mpg123
> >
> > Note that each 'aplay' is taking over 30% of my CPU time while the
> > actual MP3 decoder is only taking around 5%.
>
> What's your config? Which plugins do you use?
Here is my config, which I am not at all attached to (found it on the
web), but it does seem to allow 4xstereo with multiple sources going
into the same output stream if I want to. I don't know what plugins but
I hope either the config file or the lsmod output (below) will answer
that for me!
pcm.dmixer {
type dmix
ipc_key 1024 # must be unique!
slave {
pcm "hw:0,0" # you cannot use a "plug" device here, darn.
period_time 0
period_size 1024 # must be power of 2
buffer_size 6553 # dito. It
#format "S32_LE"
#periods 128 # dito.
#rate 8000 # with rate 8000 you *will* hear,
# if ossmix is used
}
}
pcm.ice1712 {
type hw
card 0
device 0
}
ctl.ice1712 {
type hw
card 0
device 0
}
# adcdac 1&2
pcm.channel1 {
type plug
ttable.0.0 1
ttable.1.1 1
slave.pcm "dmixer"
}
# adcdac 3&4
pcm.channel2 {
type plug
ttable.0.2 1
ttable.1.3 1
slave.pcm "dmixer"
}
#adcdac 5&6
pcm.channel3 {
type plug
ttable.0.4 1
ttable.1.5 1
slave.pcm "dmixer"
}
# adcdac 7&8
pcm.channel4 {
type plug
ttable.0.6 1
ttable.1.7 1
slave.pcm "dmixer"
}
##############################################################################
#lsmod | grep snd
snd-pcm-oss 44676 0 (autoclean)
snd-mixer-oss 16560 0 (autoclean) [snd-pcm-oss]
snd-seq-midi 5280 0 (unused)
snd-seq-midi-event 6048 0 [snd-seq-midi]
snd-seq 47312 0 [snd-seq-midi snd-seq-midi-event]
snd-ice1712 50444 0
snd-cs8427 9288 0 [snd-ice1712]
snd-pcm 85824 0 [snd-pcm-oss snd-ice1712]
snd-timer 19812 0 [snd-seq snd-pcm]
snd-ac97-codec 58860 0 [snd-ice1712]
snd-mpu401-uart 5360 0 [snd-ice1712]
snd-rawmidi 18848 0 [snd-seq-midi snd-mpu401-uart]
snd-seq-device 6284 0 [snd-seq-midi snd-seq snd-rawmidi]
snd-ice17xx-ak4xxx 2744 0 [snd-ice1712]
snd-ak4xxx-adda 5664 0 [snd-ice1712 snd-ice17xx-ak4xxx]
snd-i2c 4644 0 [snd-ice1712 snd-cs8427]
snd 46180 0 [snd-pcm-oss snd-mixer-oss
snd-seq-midi snd-seq-midi-event snd-seq snd-ice1712 snd-cs8427 snd-pcm
snd-timer snd-ac97-codec snd-mpu401-uart snd-rawmidi snd-seq-device
snd-ak4xxx-adda snd-i2c]
snd-page-alloc 10196 0 [snd-pcm]
soundcore 6468 5 [snd bttv]
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