[LAD] Re: Pipewire

On Tue, 13 Aug 2024, Robin Gareus wrote:

> This is something where macOS' Coreaudio/MIDI shines. Unlike macOS Linux/ALSA 
> has no persistent unique IDs for soundcards or MIDI devices. ALSA supports 
> hotplug, and first come first server sequential numeric IDs. The best 
> you^Wpipewire can do is keep track of cards by name.
>
> So this is not something pipewire can reliably address, until ALSA get 
> support to identify cards by vendor and serial-number, and provide a UUID.

It would of course help if device venders actually added a serial number 
other than 0. I found the best I could do was manufacture:model and then 
find out which physical usb port the device was plugged into. The bus:port 
shown by ALSA changes just by unplugging and replugging using the same 
port. ALSA also does not list the serial number even if it is something 
other than 0. As with the physical port, one has to do a dance through the 
USB info to find that out.

Having said that, it makes me wonder how Coreaudio can distinguish between 
two USB mics if they don't have serial numbers. USB mics being 
particularily bad for not having serial nummbers while at the same time 
being something that gets used in twos and threes for pod casts. (yes, 
requiring SRC to work but both coreaudio and pipewire handle that part 
without saying anything)

Len

--
Len Ovens
www.ovenwerks.net
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