class WebAudioApiSound extends Sound {

 AudioBuffer _buffer;

 WebAudioApiSound() {
   if (SoundMixer.engine != "WebAudioApi") {
     throw new UnsupportedError("This browser does not support Web Audio API.");
   }
 }

 //-------------------------------------------------------------------------------------------------
 //-------------------------------------------------------------------------------------------------

 static Future<Sound> load(String url, [SoundLoadOptions soundLoadOptions = null]) {

   if (soundLoadOptions == null) soundLoadOptions = Sound.defaultLoadOptions;

   var sound = new WebAudioApiSound();
   var loadCompleter = new Completer<Sound>();
   var audioUrls = SoundMixer._getOptimalAudioUrls(url, soundLoadOptions);
   var audioContext = WebAudioApiMixer.audioContext;

   if (audioUrls.length == 0) {
     return MockSound.load(url, soundLoadOptions);
   }

   audioRequestFinished(request) {
     audioContext.decodeAudioData(request.response).then((AudioBuffer buffer) {
       sound._buffer = buffer;
       loadCompleter.complete(sound);
     }).catchError((error) {
       if (soundLoadOptions.ignoreErrors) {
         MockSound.load(url, soundLoadOptions).then((s) => loadCompleter.complete(s));
       } else {
         loadCompleter.completeError(new StateError("Failed to decode audio."));
       }
     });
   }

   audioRequestNext(error) {
     if (audioUrls.length > 0) {
       HttpRequest.request(audioUrls.removeAt(0), responseType: 'arraybuffer')
       .then(audioRequestFinished)
       .catchError(audioRequestNext);
     } else {
       if (soundLoadOptions.ignoreErrors) {
         MockSound.load(url, soundLoadOptions).then((s) => loadCompleter.complete(s));
       } else {
         loadCompleter.completeError(new StateError("Failed to load audio."));
       }
     }
   }

   audioRequestNext(null);

   return loadCompleter.future;
 }

 //-------------------------------------------------------------------------------------------------
 //-------------------------------------------------------------------------------------------------

 num get length {
   return _buffer.duration;
 }

 SoundChannel play([bool loop = false, SoundTransform soundTransform]) {
   if (soundTransform == null) soundTransform = new SoundTransform();
   return new WebAudioApiSoundChannel(this, loop, soundTransform);
 }

}