jetson ubuntu 设置 usb声卡为默认声卡

PulseAudio/Examples - ArchWiki

#输入设备

pacmd list-sources | grep -e 'index:' -e device.string -e 'name:'                                                       

index: 2
        name: 
                device.string = "2"
    index: 3
        name: 
                device.string = "front:2"
    index: 4
        name: 
                device.string = "1"
    index: 5
        name: 
                device.string = "0"
  * index: 6
        name: 
                device.string = "front:0"
#获取名称：alsa_input.usb-Solid_State_System_Co._Ltd._USB_PnP_Audio_Device_000000000000-00.analog-stereo

#输出设备
pacmd list-sinks | grep -e 'name:' -e 'index:'

pacmd list-sinks | grep -e 'name:' -e 'index:'
  * index: 0
        name: 
    index: 1
        name: 
    index: 2
        name: 


#输出设备名称：alsa_output.usb-Solid_State_System_Co._Ltd._USB_PnP_Audio_Device_000000000000-00.analog-stereo

修改文件

sudo vim /etc/pulse/default.pa

添加上一步获取的内容

set-default-sink alsa_output.usb-Solid_State_System_Co._Ltd._USB_PnP_Audio_Device_000000000000-00.analog-stereo
set-default-source alsa_input.usb-Solid_State_System_Co._Ltd._USB_PnP_Audio_Device_000000000000-00.analog-stereo