File: test-analyser-scale.html

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Test AnalyserNode when the input is scaled</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script>
    var context = new AudioContext();

    var gain = context.createGain();
    var analyser = context.createAnalyser();
    var osc = context.createOscillator();

    osc.connect(gain);
    gain.connect(analyser);

    osc.start();

    var array = new Uint8Array(analyser.frequencyBinCount);

    function getAnalyserData() {
      gain.gain.setValueAtTime(currentGain, context.currentTime);
      analyser.getByteTimeDomainData(array);
      var inrange = true;
      var max = -1;
      for (var i = 0; i < array.length; i++) {
        if (array[i] > max) {
          max = Math.abs(array[i] - 128);
        }
      }
      if (max <= currentGain * 128) {
        assert_true(true, "Analyser got scaled data for " + currentGain);
        currentGain = tests.shift();
        if (currentGain == undefined) {
          done();
          return;
        }
      }
      requestAnimationFrame(getAnalyserData);
    }

    var tests = [1.0, 0.5, 0.0];
    var currentGain = tests.shift();
    requestAnimationFrame(getAnalyserData);
  </script>
</head>
</body>
</html>