oscillator-basic.html | Explore in Territory

<!DOCTYPE html>
<!--
Create an oscillator of each type and verify that the type is set correctly.
-->
<html>
  <head>
    <title>
      oscillator-basic.html
    </title>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
    <script src="../resources/audit-util.js"></script>
    <script src="../resources/audit.js"></script>
    <script src="../resources/start-stop-exceptions.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      let sampleRate = 44100;
      let renderLengthSeconds = 0.25;

      let oscTypes = ['sine', 'square', 'sawtooth', 'triangle', 'custom'];

      let audit = Audit.createTaskRunner();

      audit.define('basic osc tests', (task, should) => {
        // Create offline audio context.
        let context = new OfflineAudioContext(
            2, sampleRate * renderLengthSeconds, sampleRate);
        let osc = context.createOscillator();

        // Set each possible oscillator type (except CUSTOM) and verify that the
        // type is correct.  Here we're setting the type using WebIDL enum
        // values which are strings.
        for (let k = 0; k < oscTypes.length - 1; ++k) {
          osc.type = oscTypes[k];
          should(osc.type, 'osc.type = \'' + oscTypes[k] + '\'')
              .beEqualTo(oscTypes[k]);
        }

        // Verify that setting a custom type directly does not set the custom
        // type. This test has to be done before using setPeriodicWave.

        should(function() {
          osc.type = 'custom';
        }, 'osc.type = \'custom\'').throw(DOMException, 'InvalidStateError');

        // Now set a custom oscillator
        let coeffA = new Float32Array([0, 1, 0.5]);
        let coeffB = new Float32Array([0, 0, 0]);
        let wave = context.createPeriodicWave(coeffA, coeffB);

        should(function() {
          osc.setPeriodicWave(wave);
        }, 'osc.setPeriodicWave(wave)').notThrow();
        should(osc.type, 'After setting periodicWave, osc.type')
            .beEqualTo('custom');

        // Check that numerical values are no longer supported
        let oldType = osc.type;
        osc.type = 0;
        should(osc.type, 'osc.type = 0').notBeEqualTo(0);
        should(osc.type, 'osc.type').beEqualTo(oldType);

        task.done();
      });

      audit.define('start/stop exceptions', (task, should) => {
        // We're not going to render anything, so make it simple
        let context = new OfflineAudioContext(1, 1, sampleRate);
        let node = new OscillatorNode(context);

        testStartStop(should, node);
        task.done();
      });

      audit.run();
    </script>
  </body>
</html>
chromium/third_party/blink/web_tests/webaudio/Oscillator/oscillator-basic.html
