Messages in this thread | | | Date | Wed, 8 May 2024 17:10:27 -0700 | Subject | Re: [PATCH v21 27/39] ASoC: Introduce SND kcontrols to select sound card and PCM device | From | Wesley Cheng <> |
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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
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