[alsa-devel] Translating USB device names to ALSA client numbers

Hello,

I'm trying to write some udev wrappers to automatically connect USB MIDI devices to each other. My logic could be really robust if I had a way of mapping ALSA client numbers (e.g. from 'aconnect -l', such as '20:0') to physical USB devices (either by bus ID, /dev/ symlink name, /proc/asound/ files, etc.) My ultimate goal is so that when a udev rule executes upon hotplugging a MIDI device, I can reference that MIDI device by client number and then execute an aconnect command. Thus, I need some way to map USB device information to the ALSA client numbers that get reported by aconnect.

Is there any way to accomplish this? I tried to review the ALSA source code, but my eyes got jumbly after awhile.

Thanks, Dejay