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HTML

              
                
              
            
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CSS

              
                
              
            
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JS

              
                !function(){return; // 本来不要な行

// あらかじめgetUserMediaのポリフィルが読み込まれています
// https://github.com/lig-dsktschy/ligfes20160426/blob/gh-pages/01/js/getusermedia-commented.js

'use strict';

var ctx, analyser, frequencies, getByteFrequencyDataAverage;

window.AudioContext = window.AudioContext || window.webkitAudioContext;
ctx = new AudioContext();

// AnalyserNodeオブジェクトを生成
analyser = context.createAnalyser();
// 解析対象の音声データを格納するための型付き配列を準備(Uint8Array:符号なし8bit整数の配列)
// 引数(配列の要素数)にはAnalyserNodeオブジェクトのfrequencyBinCountプロパティを設定する
frequencies = new Uint8Array(analyser.frequencyBinCount);

// 音量として、解析結果の全周波数の振幅の平均を取得する
getByteFrequencyDataAverage = function() {
    // 配列に周波数ごとの振幅を格納
    analyser.getByteFrequencyData(frequencies);
    // 解析結果の全周波数の振幅を、合計し、要素数で割ることで、平均を求める
    return frequencies.reduce(function(previous, current) {
        return previous + current;
    }) / analyser.frequencyBinCount;
};

navigator.mediaDevices.getUserMedia({audio: true})
    .then(function(stream) {
        window.hackForMozzila = stream;
        ctx.createMediaStreamSource(stream).connect(ctx.destination);
    })
    .catch(function(err) {
        alert(err.message);
    });

}(); // 本来不要な行
              
            
!
999px

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