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    The buffer property of the AudioBufferSourceNode interface represents an AudioBuffer that defines the audio asset to be played.

    If the buffer property is set to the value NULL, it defines a single channel of silence.


    var source = audioCtx.createBufferSource();
    // from audioCtx.createBuffer, or audioCtx.decodeAudioData
    source.buffer = myBuffer; 


    An AudioBuffer.


    Note: For a full working example, see this code running live, or view the source.

    var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
    button.onclick = function() {
      // Fill the buffer with white noise;
      //just random values between -1.0 and 1.0
      for (var channel = 0; channel < channels; channel++) {
       // This gives us the actual ArrayBuffer that contains the data
       var nowBuffering = myArrayBuffer.getChannelData(channel);
       for (var i = 0; i < frameCount; i++) {
         // Math.random() is in [0; 1.0]
         // audio needs to be in [-1.0; 1.0]
         nowBuffering[i] = Math.random() * 2 - 1;
      // Get an AudioBufferSourceNode.
      // This is the AudioNode to use when we want to play an AudioBuffer
      var source = audioCtx.createBufferSource();
      // set the buffer in the AudioBufferSourceNode
      source.buffer = myArrayBuffer;

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 14 webkit 23.0 (23.0) Not supported 15 webkit
    6 webkit
    detune property (Yes) 40.0 (40.0) Not supported ? ?
    Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 28 webkit 25.0 (25.0) 1.2 Not supported Not supported webkit
    detune property Not supported (Yes) (Yes) (Yes) Not supported Not supported ?

    Chrome notes

    Removed in 44.0.


    Specification Status Comment
    Web Audio API
    The definition of 'buffer' in that specification.
    Working Draft  

    See also

    Document Tags and Contributors

    Contributors to this page: teoli, chrisdavidmills, kevincennis, padenotmoz, jpmedley
    Last updated by: jpmedley,