Hi Pierre,
On 5/7/2024 2:26 PM, Pierre-Louis Bossart wrote:
On 5/7/24 14:51, Wesley Cheng wrote:
Add SND kcontrol to SOC USB, which will allow for userpsace to determine which USB card number and PCM device to offload. This allows for userspace to potentially tag an alternate path for a specific USB SND card and PCM device. Previously, control was absent, and the offload path would be enabled on the last USB SND device which was connected. This logic will continue to be applicable if no mixer input is received for specific device selection.
An example to configure the offload device using tinymix: tinymix -D 0 set 'USB Offload Playback Route Select' 1 0
The above command will configure the offload path to utilize card#1 and PCM stream#0.
I don't know how this is usable in practice. Using card indices is really hard to do, it depends on the order in which devices are plugged-in...
How are the existing mechanisms handling USB audio devices, or what is the identifier being used?
Thanks Wesley Cheng