最終更新:2013-03-08 (金) 00:05:13 (4065d)  

AudioBuffer
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https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioBuffer

The Web Audio API uses an AudioBuffer for short- to medium-length sounds. The basic approach is to use XMLHttpRequest for fetching sound files.

インターフェイス 

interface AudioBuffer {

    readonly attribute float sampleRate;
    readonly attribute long length;

    // in seconds 
    readonly attribute double duration;

    readonly attribute long numberOfChannels;

    Float32Array getChannelData(unsigned long channel);
};
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例 

var soundBuffer = null;
var context = new webkitAudioContext();

function loadDogSound(url) {
  var request = new XMLHttpRequest();
  request.open('GET', url, true);
  request.responseType = 'arraybuffer';

  // Decode asynchronously
  request.onload = function() {
    context.decodeAudioData(request.response, function(buffer) {
      soundBuffer = buffer;
    }, onError);
  }
  request.send();
}
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関連

  • The audio file data is binary (not text), so we set the XMLHttpRequest.responseType? of the request to 'arraybuffer'.
  • ArrayBuffer
  • Float32Array



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