[linux-audio-user] How to setup dmix with m-audio audiophile usb

From: Florian Ladstaedter <flad@email-addr-hidden>
Date: Fri Apr 21 2006 - 01:42:44 EEST


I am struggling with setting up the alsa dmixer with the M-Audio
Audiophile USB sound card. The card works well (even better now since
alsa 1.0.11rc4/linux 2.6.17rc1) but only one application can access it
at the same time. Internet search gives a lots of results for
asound.conf dmix configurations (and that it should work out of the box
with recent alsa versions) but the M-Audio seems to be special, as
always. So,

1. Is this a stupid question? (I am a newbie...)

2. What's the correct asound.conf? I tried the following (and many
similar to this):

[First soundcard is the onboard snd-intel8x0 card, the m-audio is the
hw:2,0. It's a debian sid system with kernel 2.6.17rc2]

pcm.!default {
         type plug
         slave.pcm "dmixer"

pcm.dmixer {
         type dmix
         ipc_key 1024 # This must be a unique IPC key (see ipcs output)
         ipc_key_add_uid 0
         ipc_perm 0660
         slave {
                 pcm "hw:2,0"
                 channels 2;
                 period_time 4096
                 period_size 4096 # Must be power of 2 for alsa-oss
                 buffer_size 8192 # ditto
                 buffer_time 340000;
                 rate 44100
         bindings {
                 0 0
                 1 1

# OSS via aoss should d(mix)stroyed:
pcm.dsp2 {
type plug
slave.pcm "dmixer"

ctl.mixer2 {
     type hw
     card 2

the card still works with this, but no sound mixing. Playing a song and
using another sound appl at the same time gives:

WARNING **: alsa_setup(): Failed to open pcm device (hw:2,0): Device or
resource busy

3. Can jackd and simple alsa apps use the soundcard at the same time
with dmix (theoretically, if it would work)?

thanks, any help appreciated

Received on Fri Apr 21 04:15:03 2006

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