Hi,
as suggested in linux-audio-user I repeat my question here:
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 not with USB) but the M-Audio seems to
be special, as always. As confirmed in linux-audio-user this is due to
the fact that it is a USB device and that it needs byteswapping. So,
1. 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; does not work with this option
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
2. Can jackd and simple alsa apps use the soundcard at the same time
with dmix (theoretically, if it would work)?
any hope?
thanks, any help appreciated
Florian
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