AudioChannelManager

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.

Methods

Properties

AudioChannelManager.headphones Read only

A boolean that indicates whether headphones are plugged into the device.

AudioChannelManager.telephonySpeaker

A boolean that allows you to set whether the "telephony" audio channel should be played out of the device's speakers.

AudioChannelManager.volumeControlChannel

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

AudioChannelManager.onheadphoneschange

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

Example

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';
  }
  console.log(navigator.mozAudioChannelManager.volumeControlChannel);
}

Specifications

The AudioChannels API has no official spec at the moment; see https://wiki.mozilla.org/WebAPI/AudioChannels for implementation details, WebIDL, etc.

Browser compatibility

See also

• App permissions for Firefox OS
• Using the AudioChannels API
• navigator.mozAudioChannelManager
• HTMLMediaElement