Hi, I've been trying to set up alsa with dmix to play several streams at once so I 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 alsa wiki and found a page where it's said that if you're getting this error and have dmix set up good, that means some application is locking the /dev/dsp device ( http://alsa.opensrc.org/FAQ056 ) . The problem is I couldn't manage to find out what this application could be, neither am I sure whether the dsp is actually being used; but my guess is a no. Below are some specifications and logs. Please don't hesitate to ask me for any more information. Any light sed on this appreciated. Thanks in advance. Regards, oxi --- * 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 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 --- 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 } --- 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="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 Little Endian, Rate 44100 Hz, Stereo oxibox oxi # LC_ALL="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 slave aplay: main:545: audio open error: Invalid argument [2]+ Exit 1 LC_ALL="C" aplay -D plug:dmix tm-2007-03-20T03\:32\:51.wav
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