webglFramework/Thirdparty/three.js-master/src/audio/AudioAnalyser.js

   1 /**
   2  * @author mrdoob / http://mrdoob.com/
   3  */
   4
   5 function AudioAnalyser( audio, fftSize ) {
   6
   7         this.analyser = audio.context.createAnalyser();
   8         this.analyser.fftSize = fftSize !== undefined ? fftSize : 2048;
   9
  10         this.data = new Uint8Array( this.analyser.frequencyBinCount );
  11
  12         audio.getOutput().connect( this.analyser );
  13
  14 }
  15
  16 Object.assign( AudioAnalyser.prototype, {
  17
  18         getFrequencyData: function () {
  19
  20                 this.analyser.getByteFrequencyData( this.data );
  21
  22                 return this.data;
  23
  24         },
  25
  26         getAverageFrequency: function () {
  27
  28                 var value = 0, data = this.getFrequencyData();
  29
  30                 for ( var i = 0; i < data.length; i ++ ) {
  31
  32                         value += data[ i ];
  33
  34                 }
  35
  36                 return value / data.length;
  37
  38         }
  39
  40 } );
  41
  42 export { AudioAnalyser };