Using local file for Web Audio API in Javascript

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I had the same problem and I found this very simple solution.

audio_file.onchange = function(){
  var files = this.files;
  var file = URL.createObjectURL(files[0]); 
              audio_player.src = file; 
  audio_player.play();
};
<input id="audio_file" type="file" accept="audio/*" />
<audio id="audio_player" />

You can test here:
http://jsfiddle.net/Tv8Cm/

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