periodicWave.html | Explore in Territory

<!DOCTYPE html>
<html>
  <head>
    <title>
      Test Constructor: PeriodicWave
    </title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/webaudio/resources/audit-util.js"></script>
    <script src="/webaudio/resources/audit.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      // real and imag are used in separate PeriodicWaves to make their peak values
      // easy to determine.
      const realMax = 99;
      var real = new Float32Array(realMax + 1);
      real[1] = 2.0; // fundamental
      real[realMax] = 3.0;
      const realPeak = real[1] + real[realMax];
      const realFundamental = 19.0;
      var imag = new Float32Array(4);
      imag[0] = 6.0; // should be ignored.
      imag[3] = 0.5;
      const imagPeak = imag[3];
      const imagFundamental = 551.0;

      const testLength = 8192;
      let context = new AudioContext();

      let audit = Audit.createTaskRunner();

      // Create with the factory method

      audit.define('create with factory method', (task, should) => {
        should(() => {
          context.createPeriodicWave(new Float32Array(testLength), new Float32Array(testLength));
        }, 'context.createPeriodicWave(new Float32Array(' + testLength + '), ' +
        'new Float32Array(' + testLength + '))').notThrow();
        task.done();
      });

      audit.define('different length with factory method', (task, should) => {
        should(() => {
          context.createPeriodicWave(new Float32Array(512), new Float32Array(4));
        }, 'context.createPeriodicWave(new Float32Array(512), ' +
        'new Float32Array(4))').throw(DOMException, "IndexSizeError");
        task.done();
      });

      audit.define('too small with factory method', (task, should) => {
        should(() => {
          context.createPeriodicWave(new Float32Array(1), new Float32Array(1));
        }, 'context.createPeriodicWave(new Float32Array(1), ' +
        'new Float32Array(1))').throw(DOMException, "IndexSizeError");
        task.done();
      });

      // Create with the constructor

      audit.define('create with constructor', (task, should) => {
        should(() => {
          new PeriodicWave(context, { real: new Float32Array(testLength), imag: new Float32Array(testLength) });
        }, 'new PeriodicWave(context, { real : new Float32Array(' + testLength + '), ' +
        'imag : new Float32Array(' + testLength + ') })').notThrow();
        task.done();
      });

      audit.define('different length with constructor', (task, should) => {
        should(() => {
          new PeriodicWave(context, { real: new Float32Array(testLength), imag: new Float32Array(4) });
        }, 'new PeriodicWave(context, { real : new Float32Array(' + testLength + '), ' +
        'imag : new Float32Array(4) })').throw(DOMException, "IndexSizeError");
        task.done();
      });

      audit.define('too small with constructor', (task, should) => {
        should(() => {
          new PeriodicWave(context, { real: new Float32Array(1), imag: new Float32Array(1) });
        }, 'new PeriodicWave(context, { real : new Float32Array(1), ' +
        'imag : new Float32Array(1) })').throw(DOMException, "IndexSizeError");
        task.done();
      });

      audit.define('output test', (task, should) => {
        let context = new OfflineAudioContext(2, testLength, 44100);
        // Create the expected output buffer
        let expectations = context.createBuffer(2, testLength, context.sampleRate);
        for (var i = 0; i < expectations.length; ++i) {

          expectations.getChannelData(0)[i] = 1.0 / realPeak *
            (real[1] * Math.cos(2 * Math.PI * realFundamental * i /
                                context.sampleRate) +
             real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
                                context.sampleRate));

          expectations.getChannelData(1)[i] = 1.0 / imagPeak *
             imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i /
                                context.sampleRate);
        }

        // Create the real output buffer
        let merger = context.createChannelMerger();

        let osc1 = context.createOscillator();
        let osc2 = context.createOscillator();

        osc1.setPeriodicWave(context.createPeriodicWave(
                                real, new Float32Array(real.length)));
        osc2.setPeriodicWave(context.createPeriodicWave(
                                new Float32Array(imag.length), imag));
        osc1.frequency.value = realFundamental;
        osc2.frequency.value = imagFundamental;

        osc1.start();
        osc2.start();

        osc1.connect(merger, 0, 0);
        osc2.connect(merger, 0, 1);

        context.startRendering().then(reality => {
          should(reality, 'rendering PeriodicWave').beEqualToArray(expectations);
          task.done();
        });
      });

      audit.run();
    </script>
  </body>
</html>
chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-periodicwave-interface/periodicWave.html
