Usage

apt install build-essential git libasound2-dev

npm i alsa-volume

Example:

const alsaVolume = require('alsa-volume');

console.log('before', alsaVolume.getVolume('default', 'Line'));  // Some value
                      alsaVolume.setVolume('default', 'Line', 42);

console.log('after',  alsaVolume.getVolume('default', 'Line'));  // 42

// Get min/max values for setVolume
const range = alsaVolume.getVolumeRange('default', 'Line');
console.log(range.min);
console.log(range.max);

// Mute
alsaVolume.setMute('default', 'Line', false);
alsaVolume.toggleMute('default', 'Line');
console.log(alsaVolume.getMute('default', 'Line'));  // true

Use alsamixer to identify mixer names. Usually Master, PCM, etc.

Combine with alsa-monitor to listen for volume changes:

const alsaMonitor = require('alsa-monitor');
const alsaVolume = require('alsa-volume');

alsaMonitor.volume.on('change', () => {
    console.log(alsaVolume.getVolume('default', 'Line'));  // 42
});

Usage Dev

apt install build-essential git libasound2-dev
git clone <this repo>
cd <this repo>
npm i
npm run-script build

In a seperate window, run alsamixer, then:

node test

To-Do list

• Implement snd_mixer_selem_get_playback_volume_range instead of trial, error and hardcoding. See 1, 2, 3.

Credits

• alsa-monitor-node
• alsa-volume
• node-native-boilerplate
• NodeJS Advanced — How to create a native add-on using C++, GitHub Project
• elamperti for implementing mute & volumeRange functions