[alsa-devel] Getting stable PCM device id

Hi,

I wonder how to get a PCM identifier that would be stable if you reboot or plug/unplug sound cards in a random order.

I want to be able to store a sound card configuration and be able to restore it without relying on the card index or the device name, because if you have two times the same sound card it is not going to be unique.

I'm not an expert in hardware ids, yet I imagine that we could use the hardware serial number or equivalent?

Thank you very much,