rk3568_r:/storage/emulated/0 # cat /proc/asound/cards
0 [rockchiphdmi ]: rockchip_hdmi - rockchip,hdmi
rockchip,hdmi
1 [rockchiprk809co]: rockchip_rk809- - rockchip,rk809-codec
rockchip,rk809-codec
2 [UR22C ]: USB-Audio - Steinberg UR22C
Yamaha Corporation Steinberg UR22C at usb-xhci-hcd.5.auto-1, high speed
rk3568_r:/storage/emulated/0 # cat /proc/asound/devices
2: [ 0- 0]: digital audio playback
3: [ 0] : control
4: [ 1- 0]: digital audio playback
5: [ 1- 0]: digital audio capture
6: [ 1] : control
7: [ 2- 0]: digital audio playback
8: [ 2- 0]: digital audio capture
9: [ 2] : control
10: [ 2- 0]: raw midi
33: : timer
rk3568_r:/storage/emulated/0 # cat /proc/asound/pcm
00-00: fe400000.i2s-i2s-hifi i2s-hifi-0 : fe400000.i2s-i2s-hifi i2s-hifi-0 : playback 1
01-00: fe410000.i2s-rk817-hifi rk817-hifi-0 : fe410000.i2s-rk817-hifi rk817-hifi-0 : playback 1 : capture 1
02-00: USB Audio : USB Audio : playback 1 : capture 1