The AudioChannelManager interface of the AudioChannels API includes features for managing your device's audio channels, including setting what channel's volume to affect when the volume buttons are pressed inside a particular app.


Note: Inherits methods from its parent, EventTarget


Note: Inherits properties from its parent, EventTarget

AudioChannelManager.headphones Read only
A boolean that indicates whether headphones are plugged into the device.
A boolean that allows you to set whether the "telephony" audio channel should be played out of the device's speakers.
A DOMString that allows you to set which audio channel should have its volume changed when you press the device's hardware volume controls.

Event handlers

Fired when the device's headphones are plugged in or unplugged.


In the following simple example, we use the navigator.mozAudioChannelManager property to access the app's AudioChannelManager object, first to do some rudimentary feature detection, and then to set value of the AudioChannelManager.volumeControlChannel property, based on a received variable.

var channelValue = 'content';

if (navigator.mozAudioChannelManager) {
  if(channelValue == 'normal') {
    navigator.mozAudioChannelManager.volumeControlChannel = 'normal';
  } else if(channelValue == 'content') {
    navigator.mozAudioChannelManager.volumeControlChannel = 'content';

Note: For a complete working example, see our audio-channels-demo. Try running this on your Firefox OS device as an installed app (install it using App Manager/WebIDE) and then see what happens when you play the music and then put the app in the background, with the channel set to normal, then content.


The AudioChannels API has no official spec at the moment; see for implementation details, WebIDL, etc.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
General support No support No support No support No support No support
Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
General support No support No support No support 1.0.1 No support No support No support

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Audio audio AudioChannelManager AudioChannels Firefox OS Interface Non-standard Reference