audioworkletglobalscope-sample-rate.https.html

<!DOCTYPE html>
<html>
  <head>
    <title>
      Test sampleRate in AudioWorkletGlobalScope
    </title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/webaudio/resources/audit.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      let audit = Audit.createTaskRunner();

      setup(() => {
        let sampleRate = 48000;
        let renderLength = 512;
        let context = new OfflineAudioContext(1, renderLength, sampleRate);

        let filePath = 'processors/one-pole-processor.js';

        // Without rendering the context, attempt to access |sampleRate| in the
        // global scope as soon as it is created.
        audit.define(
            'Query |sampleRate| upon AudioWorkletGlobalScope construction',
            (task, should) => {
              let onePoleFilterNode =
                  new AudioWorkletNode(context, 'one-pole-filter');
              let frequencyParam = onePoleFilterNode.parameters.get('frequency');

              should(frequencyParam.maxValue,
                     'frequencyParam.maxValue')
                  .beEqualTo(0.5 * context.sampleRate);

              task.done();
            });

        context.audioWorklet.addModule(filePath).then(() => {
          audit.run();
        });
      });
    </script>
  </body>
</html>

chromium/third_party/blink/web_tests/external/wpt/webaudio/the-audio-api/the-audioworklet-interface/audioworkletglobalscope-sample-rate.https.html