What to check if no sound

This document is draft and contains just list of notes.

In domD

Check presence of audio devices

ls -la /dev/pcm*

Check that devices are visible to ALSA

aplay -l

Check playback

cat /dev/urandom | aplay -f S24_LE -c 2

Also you can check ALSA playback without Pulse plugin, directly to hardware

systemctl stop pulseaudio
cat /dev/urandom | aplay -f S24_LE -c 2 -D hw:0,0

Check volume settings

amixer -c0 set "DVC Out" 1%

Pay attention that value higher than 3% results in audio distortions.

In domA

At first you need to provide some .wav file to domA

adb connect <...>
adb root && adb remount
adb push 48000_16_2ch.wav /data/
adb shell sync

After that you can use tinyplay to check playback without Android's audio stack. Login into domA and use

tinyplay /data/48000_16_2ch.wav