dspjs/test/beatdetect-test.js

DSP.js is a comprehensive digital signal processing library for javascript

load('audio-harness.js');
load('dsp.js');
load('beatdetektor.js');

var iterations = 1000;

var fft = fft = new FFT(frameBufferLength / channels, rate);
var bd = new BeatDetektor();
var kick_det = new BeatDetektor.modules.vis.BassKick();
var vu = new BeatDetektor.modules.vis.VU();

var m_BeatTimer = 0;
var m_BeatCounter = 0;
var ftimer = 0;

var calcBeat = function() {
  var fb     = getFramebuffer(),
      signal = DSP.getChannel(DSP.MIX, fb);

  fft.forward(signal);

  var timestamp = (new Date()).getTime();
  bd.process(timestamp, fft.spectrum);

  // Bass Kick detection
  kick_det.process(bd);
  vu.process(bd);
};

runTest(calcBeat, iterations);