panner-azimuth.html

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This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>Test Panner Azimuth Calculation</title>

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

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

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

  </head>

  <body>

    <script>

      const audit = Audit.createTaskRunner();

      // Fairly arbitrary sample rate

      const sampleRate = 16000;

      audit.define('Azimuth calculation', (task, should) => {

        // Two channels for the context so we can see each channel of the

        // panner node.

        let context = new OfflineAudioContext(2, sampleRate, sampleRate);

        let src = new ConstantSourceNode(context);

        let panner = new PannerNode(context);

        src.connect(panner).connect(context.destination);

        // The source is still pointed directly at the listener, but is now

        // directly above.  The audio should be the same in both the left and

        // right channels.

        panner.positionY.value = 1;

        src.start();

        context.startRendering()

            .then(audioBuffer => {

              // The left and right channels should contain the same signal.

              let c0 = audioBuffer.getChannelData(0);

              let c1 = audioBuffer.getChannelData(1);

              let expected = Math.fround(Math.SQRT1_2);

              should(c0, 'Left channel').beConstantValueOf(expected);

              should(c1, 'Righteft channel').beConstantValueOf(expected);

})

            .then(() => task.done());

});

      audit.run();

    </script>

  </body>

</html>