iMX Audio How To

CompuLab iMX Audio

Available audio devices

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: imxaudiohdmi [imx-audio-hdmi], device 0: imx8 hdmi i2s-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: imxspdif [imx-spdif], device 0: S/PDIF PCM snd-soc-dummy-dai-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 3: compulabimx8mq [compulab-imx8mq], device 0: 308b0000.sai-wm8731-hifi wm8731-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Unmute wm8731 and save the card settings

• wm8731 'Output Mixer HiFi Playback Switch' on

card=$(aplay -l | awk '(/compulab/)&&($0=$2)&&(gsub(/:/,""))')
amixer -c ${card} cset numid=13 1
alsactl store ${card}

Audio Test

• Left/Right Channel test

card=$(aplay -L | awk '/sysdefault.*compulab/')
speaker-test -D ${card} -c 2 -t syn -l 1

Switching between available audio sinks

• Configure the compulabimx8mq card as the default audio sink:

pactl set-default-sink $(pactl list sinks | awk '/wm8731-hifi/' RS="" | awk -F":" '(/Name/)&&($0=$NF)')
pactl info

• Configure the imx-audio-hdmi card as the default audio sink:

pactl set-default-sink $(pactl list sinks | awk '/imx-audio-hdmi/' RS="" | awk -F":" '(/Name/)&&($0=$NF)')
pactl info

• Interactive audio sink switch script

wget https://raw.githubusercontent.com/compulab-yokneam/Documentation/master/audio/sink-switch.sh

• Run is this way:

bash /path/to/sink-switch.sh