So, the app gets an error. Which error?At Mon, 21 Jul 2003 00:40:32 +0100, James Courtier-Dutton wrote:
Hi,
Is there any way to tell if a USB sound card has been disconnected or not?
IIRC, this is not notified to the application.
the app simply would get an error at the further access.
it sounds not bad to notify the status change to the application by
some way.
perhaps we can add a new control element for this purpose.
and after disconnection, only this element survives to communicate
with the application...
How do I test to see if the error is due to a non-existant device, or just underrun/overrun etc.
I would be happy if there was a reliable way to tell.
This would only give us the "disconnect" event.
How would one know if the device was connected again?
Maybe a tidy way to do this would be a new alsa events device.
So, we open the "events" device, and it can then inform us of hardware changes. I know that USB is the only form of device that connects/disconnects via a user action at the moment, but I am sure others will come along. E.g. Bluetooth etc.
For USB, usbaudio.c definitely gets informed about usb device removal/addition, how can we get that message passed up to the application?
Cheers James
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