I'd like to switch the default alsa card on-the-fly when an USB sound
device is plugged into the system.
I kown how to write a proper udev rule, but I can't write a satisfying
asoundrc file. I tryed and it works with some applications, it supports
software mixer too, but it doesn't work with VLC, or Mixxx, they claim
that the default device is already busy or don't find any.
I read the alsa.conf file, where I found many option in the form:
defaults.ctl.card 0
defaults.pcm.card 0
defaults.pcm.device 0
defaults.pcm.subdevice -1
defaults.pcm.nonblock 1
[...]
etc.
followed by parametrized function like
pcm.hw {
@args [ CARD DEV SUBDEV ]
[...]
}
I'd like to use environmental variables to swith the default card, but I
don't understand how.
Any clue?
Thanks in andvance.
--
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