Switching sound cards on the fly

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How difficult would it be to add to alsa-lib a mechanism where
applications can register an "ALSA config changed" callback that would
be invoked when an app like gnome-sound-properties changes the default
sound device by updating .asoundrc?  Changes to ALSA config files
could be detected via inotify.

I think this could allow for relatively seamless switching of the
audio output device.

Lee

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