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Device gone away notification?

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Device gone away notification?

Subject: Device gone away notification?
From: Ethan Funk <email@hidden>
Date: Sun, 6 Sep 2009 12:55:01 -0700

I noticed the following behavior in the HAL output unit:

The units device is set to a USB audio device, everything is set up and running with audio playing through the unit, then I pull the USB plug. Suddenly, the audio starts playing through the system sound device.

I have not tried this with a firewire interface, but I expect it would be the same.

OK, that's a nifty trick, but what I really need is some sort of notification so I can stop and tear down the audio unit. Is there such a mechanism? What would be really nice is if the rendering would stop until the device comes back, but that is a lot to ask.

Thanks,
Ethan...
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