test-analyser-minimum.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-analysernode-interface/test-analyser-minimum.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title>Test AnalyserNode when the input is silent</title>

  <meta name="timeout" content="long">

  <script src="/resources/testharness.js"></script>

  <script src="/resources/testharnessreport.js"></script>

  <script>

    setup({ single_test: true });

    var ac = new AudioContext();

    var analyser = ac.createAnalyser();

    var constant = ac.createConstantSource();

    var sp = ac.createScriptProcessor(2048, 1, 1);

    constant.offset.value = 0.0;

    constant.connect(analyser).connect(ac.destination);

    constant.connect(sp).connect(ac.destination);

    var buf = new Float32Array(analyser.frequencyBinCount);

    var iteration_count = 10;

    sp.onaudioprocess = function() {

      analyser.getFloatFrequencyData(buf);

      var correct = true;

      for (var i = 0; i < buf.length; i++) {

        correct &= buf[i] == -Infinity;

      assert_true(!!correct, "silent input process -Infinity in decibel bins");

      if (!iteration_count--) {

        sp.onaudioprocess = null;

        constant.stop();

        ac.close();

        done();

};

    constant.start();

  </script>

</head>

</body>

</html>