Hi!
I have a laptop and use an Aureon 5.1 USB card from Terratec at home,
and my internal sound card if I'm on the road. I am, of course, too lazy
to switch the default soundcard manually, so I wonder if there is a way
to either
i) make the USB soundcard the default, and automatically use the other
if the USB card isn't available
or
ii) use a multi device to dupe the audio stream to both cards that
doesn't fail if one card isn't available, but silently ignores that
and just plays on the other one.
Of course I could write a script that changes my ~/.asoundrc if the USB
card is available or not, if there is no sane way to do it with alsa.
At the moment, I have a setup like in ii), but currently it fails if the
USB card isn't plugged in. My ~/.asoundrc follows.
pcm.!default plug:both
ctl.!default {
type hw
card ICH6
}
# This creates a 2-channel interleaved pcm stream based on
# two 2-channel slave devices.
pcm.both {
type route;
slave.pcm {
# create a virtual 4-channel device from two sound devices
type multi;
slaves.a.pcm "intel8x0";
slaves.b.pcm "aureon";
slaves.a.channels 2;
slaves.b.channels 6;
bindings.0.slave a;
bindings.0.channel 0;
bindings.1.slave a;
bindings.1.channel 1;
bindings.2.slave b;
bindings.2.channel 0;
bindings.3.slave b;
bindings.3.channel 1;
bindings.4.slave b;
bindings.4.channel 2;
bindings.5.slave b;
bindings.5.channel 3;
bindings.6.slave b;
bindings.6.channel 4;
bindings.7.slave b;
bindings.7.channel 5;
}
# Map two channels of input to four channels of output
ttable.0.0 1;
ttable.1.1 1;
ttable.0.2 1;
ttable.1.3 1;
ttable.0.4 1;
ttable.1.5 1;
ttable.0.6 0.5;
ttable.1.6 0.5;
ttable.0.7 0.5;
ttable.1.7 0.5;
}
# Some programs will be unhappy if there is no mixer to talk to,
# so we set this to one of the cards.
ctl.both {
type hw;
card ICH6;
}
pcm.aureon {
type dmix
ipc_key 1024
slave {
pcm "hw:1"
period_time 0
period_size 2048
# buffer_size 8192
buffer_size 65536
buffer_time 0
periods 128
rate 48000
channels 6
}
bindings {
0 0
1 1
2 4
3 5
4 2
5 3
}
}
pcm.intel8x0 {
type dmix
ipc_key 2048
slave {
pcm "hw:0"
period_time 0
period_size 2048
# buffer_size 8192
buffer_size 65536
buffer_time 0
periods 128
rate 48000
channels 2
}
bindings {
0 0
1 1
}
}
ctl.aureon {
type hw
card "Audio"
}
ctl.intel8x0 {
type hw
card "ICH6"
}
Tobias
--
open STDOUT, "|-"
and print "uJa tsonrehtP lreahrekc"
or print pack "nN"x4, unpack "vV"x4, <STDIN>
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