for_webrtc.html

<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/blitzer/jquery-ui.css" rel="stylesheet" type="text/css"/><!-- jquery UI のcss-->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.0/jquery.min.js"></script><!-- jquery　本体-->
<script type="text/javascript"  src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.12/jquery-ui.min.js"></script><!-- jquery-UI　本体-->

<video id="myVideo" width="400" height="300" autoplay></video>
<button>get</button>
<div class="aaa"></div>
<script type="text/javascript">
  console.log("start");
  var video = document.getElementById('myVideo');
  navigator.getMedia = ( navigator.getUserMedia ||
                          navigator.webkitGetUserMedia ||
                          navigator.mozGetUserMedia ||
                          navigator.msGetUserMedia );

  navigator.getMedia({audio:true, video:true}, success, error);

  function success(stream) {
    var context = new webkitAudioContext();
    var source = context.createMediaStreamSource(stream);
    var audioAnalyser = context.createAnalyser();
    var audioAnalyzedData = new Uint8Array(audioAnalyser.frequencyBinCount);

    source.connect(audioAnalyser);
    //source.connect(context.destination);

    data = audioAnalyser.getByteFrequencyData(audioAnalyzedData);
    console.log(audioAnalyzedData[500]);

    // ためし
    $("button").bind("click",function(){
      audioAnalyser.getByteFrequencyData(audioAnalyzedData);
      console.log(audioAnalyzedData);   
      // alert(audioAnalyzedData[500]);
      $(".aaa").text(audioAnalyzedData[500]); 
      start();
    });

    setInterval(function(){
      audioAnalyser.getByteFrequencyData(audioAnalyzedData);
      if (audioAnalyzedData[100] > 120){
        $(".aaa").text("ふいてる");
        console.log("ふいてる");    
      };
    },100);

    // video.src = window.webkitURL.createObjectURL(stream);
    
  }
  
  function error(err) {
    console.log(err);
  }


</script>