[Media_api] Device disconnected while playing

[Roger Dannenberg]

 > We are trying to get a notification when the current MIDI device gets 
disconnected.

This sounds like a function that should be added to PortMidi. My initial 
thought is that the read request (which the caller is practically 
required to poll) could return an error code indicating the port is 
disconnected.

I'm not sure what windows actually does when a device is disconnected. I 
can look into it, but if you're experimenting already, you might look in 
pmwinmm.c at winmm_in_callback -- there are some unhandled cases 
(MIM_CLOSE, MIM_ERROR, MIM_LONG_ERROR, default, ...) that might occur 
upon disconnect. Let me know if you find anything -- my experience and 
the origins of this code go back to pre-USB devices that you couldn't 
disconnect, so I haven't really though about this.

-Roger

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