Buffer load Media files

buffer-loader.js

function BufferLoader(context, urlList, callback) {
  this.context = context;
  this.urlList = urlList;
  this.onload = callback;
  this.bufferList = new Array();
  this.loadCount = 0;
}

BufferLoader.prototype.loadBuffer = function(url, index) {
  var request = new XMLHttpRequest();
  request.open('GET', url, true);
  request.responseType = 'arraybuffer';

  var loader = this;

  request.onload = function() {
    loader.context.decodeAudioData(
      request.response,
      function(buffer) {
        if (!buffer) {
          return;
        }
        loader.bufferList[index] = buffer;
        buffer.bufferSize = 2048;
        if (++loader.loadCount == loader.urlList.length) {
          loader.onload(loader.bufferList);
        }
      },
      function(error) {
        console.error('decodeAudioData error', error);
      }
    );
  }

  request.onerror = function() {
    console.error('BufferLoader: XHR error');
  }

  request.send();
};

BufferLoader.prototype.load = function() {
  for (var i = 0; i < this.urlList.length; i++) {
    this.loadBuffer(this.urlList[i], i);
  }
};