Le Sun, 04 Jan 2009 12:02:44 +0100,Tobias Gödderz <goedderz@xxxxxxxxxxx> a écrit :
> 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.>
It must be also possible to use udev. I am no an expert, but I know that, ifudev load your usb sound card before alsasound, no matter what isin /etc/modprobe.conf, the usb sound card will be the first one, that imply thedefault card.
Most users do not want that and blacklist usb_snd_audioin /etc/modprobe,d/blacklist.
> 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>
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