Hi,
I've been trying to set up alsa with dmix to play several streams at once s=
o I=20
don't have to close a sound application when I want to use another, f.e.
The problem is I get a dmix error all the time. I've been searching the als=
a=20
wiki and found a page where it's said that if you're getting this error and=
=20
have dmix set up good, that means some application is locking the /dev/dsp=
=20
device ( http://alsa.opensrc.org/FAQ056 ) . The problem is I couldn't manag=
e=20
to find out what this application could be, neither am I sure whether the d=
sp=20
is actually being used; but my guess is a no.
Below are some specifications and logs. Please don't hesitate to ask me for=
=20
any more information. Any light sed on this appreciated. Thanks in advance.
Regards,
oxi
=2D--
* Using Gentoo Linux
oxibox oxi # uname -a
Linux oxibox 2.6.19-gentoo-r5 #1 SMP Wed Jan 31 05:56:08 CET 2007 i686 AMD=
=20
Athlon(tm) 64 Processor 3200+ AuthenticAMD GNU/Linux
* Neither oss or alsa are compiled into the kernel.
Alsa packages versions:
media-libs/alsa-lib-1.0.14_rc1
media-libs/alsa-oss-1.0.12
media-sound/alsa-driver-1.0.14_rc1
media-sound/alsa-firmware-1.0.14_rc1
media-sound/alsa-headers-1.0.14_rc1
media-sound/alsa-tools-1.0.14_rc1
media-sound/alsa-utils-1.0.14_rc1
* Got an Echo Audio Layla24 sound interface as my primary device
=2D--
THIS IS MY /etc/asound.conf
# ~/.asoundrc
pcm.layla24 {
type dmix
ipc_key 1024
slave {
pcm "hw:0"
period_time 0
period_size 1024
buffer_size 4096
rate 44100
channels 8
}
bindings {
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
}
}
pcm.!default {
type plug
slave.pcm "layla24"
}
pcm.default {
type plug
slave.pcm "layla24"
}
#OSS
pcm.dsp {
type plug
slave.pcm "layla24"
}
pcm.dsp0 {
type plug
slave.pcm "layla24"
}
ctl.layla24 {
type hw
card 0
}
#JACK
pcm.jackplug {
type plug
slave.pcm "jack"
}
pcm.jack {
type jack
playback_ports {
0 alsa_pcm:playback_1
1 alsa_pcm:playback_2
}
capture_ports {
0 alsa_pcm:capture_1
1 alsa_pcm:capture_2
}
}
#JUEGOS DE CANALES
pcm.uno {
type plug
slave.pcm "layla24"
slave.channels 8
ttable.0.0 1
ttable.1.1 1
}
pcm.dos {
type plug
slave.pcm "layla24"
slave.channels 8
ttable.0.2 1
ttable.1.3 1
}
pcm.tres {
type plug
slave.pcm "layla24"
slave.channels 8
ttable.0.4 1
ttable.1.5 1
}
pcm.cuatro {
type plug
slave.pcm "layla24"
slave.channels 8
ttable.0.6 1
ttable.1.7 1
}
=2D--
TESTING DMIX
oxibox oxi # /etc/init.d/alsasound restart
* Storing ALSA Mixer Levels ... [ ok ]
* Unloading ALSA ... [ ok ]
* Unloading ALSA modules ... [ ok ]
* Loading ALSA modules ...
* Loading: snd-card-0 ... [ ok ]
* Loading: snd-card-1 ... [ ok ]
* Loading: snd-seq-oss ... [ ok ]
* Loading: snd-pcm-oss ... [ ok ]
* Loading: snd-seq-midi ... [ ok ]
* Restoring Mixer Levels ... [ ok ]
oxibox oxi # lsof /dev/dsp
oxibox oxi # lsof | grep dsp
oxibox oxi # LC_ALL=3D"C" aplay -D plug:dmix tm-2007-03-20T03\:32\:51.wav &
[1] 10287
oxibox oxi # Playing WAVE 'tm-2007-03-20T03:32:51.wav' : Signed 16 bit Litt=
le=20
Endian, Rate 44100 Hz, Stereo
oxibox oxi # LC_ALL=3D"C" aplay -D plug:dmix tm-2007-03-20T03\:32\:51.wav &
[2] 10288
oxibox oxi # ALSA lib pcm_dmix.c:914:(snd_pcm_dmix_open) unable to open sla=
ve
aplay: main:545: audio open error: Invalid argument
[2]+ Exit 1 LC_ALL=3D"C" aplay -D plug:dmix=20
tm-2007-03-20T03\:32\:51.wav
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