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Sound on Linux

Volume Control

The newer ubuntu desktop image pre-installed the Volume Control setting app, you can use it to switch the audio output from HDMI/SPDIF or to AVout.

Volume control playback.png Volume control output devices.png


To test audio on Radxa Rock, you can run the following command:

   root@radxa:~# speaker-test -t wav -c 2

the output is

   speaker-test 1.0.25
   Playback device is default
   Stream parameters are 48000Hz, S16_LE, 2 channels
   WAV file(s)
   Rate set to 48000Hz (requested 48000Hz)
   Buffer size range from 48 to 32768
   Period size range from 16 to 3072
   Using max buffer size 32768
   Periods = 4
   was set period_size = 2979
   was set buffer_size = 32768
   0 - Front Left
   1 - Front Right
   Time per period = 2.061311

And you can hear the audio from HDMI or with headphone from the AV out jact.


If you want to set the default audio out put from SPDIF Create the file /etc/asound.conf and add the following content:

   pcm.!default {
       type hw
       card 1
       device 0
  ctl.!default {
       type hw
       card 1

Squeezelite on rock with USB DAC

Working on getting squeezelite working with a USB DAC to play with Logitech Media Server. You need Logitech Media Server otherwise squeezelite is worthless without it. I have several instances of LMS around my house

Download Squeezelite AMRV6hf from here
   sudo mv ./squeezelite-armv6hf /usr/bin/squeezelite
   sudo chmod ug+x /usr/bin/squeezelite

Plug Dac into USB and type

   squeezelite -l

It lists all sound devices. I typically use the "front" device. Then type.

   squeezelite -o front:CARD=DAC,DEV=0 -n ANYNAMEYOUWANT -s YOUR . SERVER . ADDRESS -a ::16:


   squeezelite -o front:CARD=DAC,DEV=0 -n RadxaRock -s -a ::16:

Unfortunately I can't get it working in 24 bit so far. I'm close with a few pops and clicks and hopefully can get it. And anybody that has any ideas I'm all ears.