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Working with Audio

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The Ext.Audio class (xtype: audio) acts as a wrapper for the html5 <audio> tag.

The recommended file types/compression are:

  • Uncompressed WAV and AIF
  • MP3
  • AAC-LC
  • HE-AAC

You will typically set the following configuration properties:

Config Option Description
url

String. The URL of the audio file.

autoPause Pauses the media when the container is deactivated.
autoResume Starts playing the audio immediately when the container is activated.
enableControls Boolean. Set to false to turn off native controls. Defaults to false on Android.
muted Boolean. Determines if the media is muted. Sets the volume to 0. Defaults to false.
preload Boolean. Starts downloading the media immediately. Defaults to true.
volume Number. The volume of the playback in a range of 0.0 to 1.0

Consequently, a simple instantiation of the Ext.Img class resembles the following:

{
 xtype: 'audio',
 src: 'http://docs.sencha.com/touch/2-1/touch-build/examples/audio/crash.mp3',
 autoResume: true,
 autoPause: true,
 enableControls: true
}

Ext.Audio and Ext.Video also support the following methods:

Method Description
isPlaying()Returns the current play status as a boolean.
pause()Pauses playback.
play()Continues playback.
stop()Stops playback and returns to the beginning of the loop.
toggle()Toggles the playback state.

Unfortunately, Android devices do not support native audio controls, so to ensure cross-device compatibility, you might want to develop your own custom player, as illustrated by the following example:

Ext.define('MyApp.view.AudioPlayer', {
 extend: 'Ext.Container',
 alias: 'widget.audioplayer',

 config: {
  url: 'http://docs.sencha.com/touch/2-1/touch-build/examples/audio/crash.mp3',
  autoPause: true,
  autoResume: true,
  enableControls: false,
  preload: true,
  layout: {
    type: 'vbox'
  }
 },

 initialize: function() {
  
  this.add({
   xtype: 'audio',
   url: this.getUrl(),
   autoResume: this.getAutoResume(),
   preload: this.getPreload(),
   autoPause: this.getAutoPause(),
   enableControls: this.getEnableControls()
  });

  if (!this.getEnableControls() || Ext.os.is.Android) {
   this.add({
    xtype: 'button',
    text: 'Play',
    handler: function(b,e) {
     var audio = this.getParent().down('audio');
     if (audio.isPlaying()) {
       audio.pause();
       b.setText('Play audio');
      } else {
       audio.play();
       b.setText('Pause Audio');
      }
     }
   })
  }
  
  this.callParent(arguments);
 }
});
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