Setting up jukebox player

Jukebox might not always work out-of-the-box and may require some additional tweaking. If you get no sound output while trying to play via the Jukebox, you might need to tweak the audio device being picked up by Java sound.

Finding device name

You can run the folowing Java program to get a list of all the audio devices in your system:

import java.io.*;
import javax.sound.sampled.*;

public class audioDevList {
    public static void main(String args[]) {
        Mixer.Info[] mixerInfo =
            AudioSystem.getMixerInfo();
            System.out.println("Available mixers:");
            for(int cnt = 0; cnt < mixerInfo.length;cnt++) {
                System.out.println(mixerInfo[cnt].getName());
        }
    }
}

Sample output:

Available mixers:
Port HDMI [hw:0]
Port PCH [hw:1]
default [default]
HDMI [plughw:0,3]
HDMI [plughw:0,7]
HDMI [plughw:0,8]
HDMI [plughw:0,9]
HDMI [plughw:0,10]
PCH [plughw:1,0]

Using sound.properties

You can then generate a sound.properties file accordingly with your devicename:

javax.sound.sampled.Clip=#PCH [plughw:1,0]
javax.sound.sampled.Port=#Port PCH [hw:1]
javax.sound.sampled.SourceDataLine=#PCH [plughw:1,0]
javax.sound.sampled.TargetDataLine=#PCH [plughw:1,0]

Copy the sound.properties file to /usr/lib/jvm/java-1.8-openjdk/jre/lib/sound.properties. Change java-1.8-openjdk depending on your java installation.

Using Java parameters

You can pass the devicename as parameter into the launch script/service file:

-Djavax.sound.sampled.Clip=#PCH [plughw:1,0]
-Djavax.sound.sampled.Port=#Port PCH [hw:1]
-Djavax.sound.sampled.SourceDataLine=#PCH [plughw:1,0]
-Djavax.sound.sampled.TargetDataLine=#PCH [plughw:1,0]

Using Docker

• Ensure that the docker user (passed through --user in the docker run) command has access to the /dev/snd device. Typically this can be done on most distros by adding the user to the audio group. You can alternatively use the --group-add flag to add the audio group the the user.
• Pass the --device /dev/snd argument for docker run. See the docker documentation for more details.
• You can mount a copy of the previous sound.properties file to /usr/lib/jvm/java-1.8-openjdk/jre/lib/sound.properties inside the container.

All of the above might result in an invocation like the following:

docker run \
    -v /home/airsonic/music:/music \
    -v /home/airsonic/config:/config \
    -v /home/airsonic/podcasts:/podcasts \
    -v /home/airsonic/playlists:/playlists \
    --group-add audio \
    --device /dev/snd \
    -v /home/airsonic/sound.properties:/usr/lib/jvm/java-1.8-openjdk/jre/lib/sound.properties \
    -p 4040:4040 \
    airsonic/airsonic

Use Jukebox with Pulseaudio

The point of this configuration is to force pulseaudio to use mixed ALSA output alsa_output.dmix (if it’s available in your system). To check what sink is being used use pactl list sinks.

Configure java machine as stated above to get Jukebox working

Configure pulseaudio alsa module to use dmix device by default (remember to edit an apropriate *.pa file, /etc/pulse/default.pa if your pulseaudio instance is being autospawn by clients or /etc/pulse/system.pa if you run pulseaudio in system mode):

load-module module-alsa-sink device=dmix
load-module module-alsa-source device=snoop

Configure pulseaudio to use dmix output by default.

set-default-sink asla_output.dmix