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    AudioBufferSourceNode.loopEnd

    The loopEnd property of the AudioBufferSourceNode interface is a double value indicating, in seconds, where in the AudioBuffer the restart of the play must end (and then loop again.)

    The loopEnd property's default value is 0.

    Syntax

    var source = audioCtx.createBufferSource();
    source.loopEnd = 3;
    

    Value

    A double.

    Example

    In this example, the AudioContext.decodeAudioData function is used to decode an audio track and put it into an AudioBufferSourceNode. Buttons are provided to play and stop the audio playback, and slider controls are used to change the playbackRate, loopStart and loopEnd properties on the fly.

    When the audio is played to the end, it loops, but you can control how long the loops last by altering loopStart and loopEnd. For example, if you set their values to 20 and 25, respectively, the audio will start to loop between 20 and 25 seconds into the track.

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

    function getData() {
      source = audioCtx.createBufferSource();
      request = new XMLHttpRequest();
    
      request.open('GET', 'viper.ogg', true);
    
      request.responseType = 'arraybuffer';
    
    
      request.onload = function() {
        var audioData = request.response;
    
        audioCtx.decodeAudioData(audioData, function(buffer) {
            myBuffer = buffer;
            songLength = buffer.duration;
            source.buffer = myBuffer;
            source.playbackRate.value = playbackControl.value;
            source.connect(audioCtx.destination);
            source.loop = true;
    
            loopstartControl.setAttribute('max', Math.floor(songLength));
            loopendControl.setAttribute('max', Math.floor(songLength));
          },
    
          function(e){"Error with decoding audio data" + e.err});
    
      }
    
      request.send();
    }
    
      ...
    
    loopstartControl.oninput = function() {
      source.loopStart = loopstartControl.value;
      loopstartValue.innerHTML = loopstartControl.value;
    }
    
    loopendControl.oninput = function() {
      source.loopEnd = loopendControl.value;
      loopendValue.innerHTML = loopendControl.value;
    }

    Specification

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

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 14 webkit 23 Not supported 15 webkit
    22 (unprefixed)
    6 webkit
    Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 28 webkit 25 1.2 Not supported Not supported webkit

    See also

    Document Tags and Contributors

    Contributors to this page: teoli, chrisdavidmills
    Last updated by: teoli,