Untitled

function createAudioFingerprint() {
    var audioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
    var context = new audioContext(1, 44100, 44100);

    var oscillator = context.createOscillator();
    oscillator.type = 'triangle';
    oscillator.frequency.value = 10000;

    var compressor = context.createDynamicsCompressor();
    ['threshold', 'knee', 'ratio', 'reduction', 'attack', 'release'].forEach(function(prop) {
        if (compressor[prop] instanceof AudioParam) {
            compressor[prop].value = Math.random();
        }
    });

    oscillator.connect(compressor);
    compressor.connect(context.destination);
    oscillator.start(0);
    context.startRendering();

    return new Promise(function(resolve, reject) {
        context.oncomplete = function(event) {
            var fingerprint = '';
            for (var i = 0; i < event.renderedBuffer.length; i++) {
                fingerprint += String.fromCharCode(event.renderedBuffer[i]);
            }
            resolve(btoa(fingerprint));
        };
    });
}

createAudioFingerprint().then(function(fingerprint) {
    console.log(fingerprint);
});