gistfile1.js

function readTep(evt) {
  var three;
  taps.push((new Date()).getTime());
  taps = taps.slice(-3);
  if (taps.length === 3) {
    three = taps.reduce(function(p, c, i) {
      return p && Math.abs(c - (taps[i - 1] || c)) < 50;
    }, true);

    if (three) {
      callback();
      taps.length = 0;
    }
  }
}

player.on('tap', readTap);