panner-rolloff-clamping.html

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

<!DOCTYPE html>

<html>

  <head>

    <title>

      Test Clamping of PannerNode rolloffFactor

    </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>

  </head>

  <body>

    <script id="layout-test-code">

      // Fairly arbitrary sample rate and render frames.

      let sampleRate = 16000;

      let renderFrames = 2048;

      let audit = Audit.createTaskRunner();

      audit.define(

            label: 'linear-clamp-high',

            description: 'rolloffFactor clamping for linear distance model'

},

          (task, should) => {

            runTest(should, {

              distanceModel: 'linear',

              // Fairly arbitrary value outside the nominal range

              rolloffFactor: 2,

              clampedRolloff: 1

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

});

      // Test clamping of the rolloffFactor.  The test is done by comparing the

      // output of a panner with the rolloffFactor set outside the nominal range

      // against the output of a panner with the rolloffFactor clamped to the

      // nominal range.  The outputs should be the same.

//

      // The |options| dictionary should contain the members

      //   distanceModel  - The distance model to use for the panners

      //   rolloffFactor  - The desired rolloffFactor.  Should be outside the

      //                    nominal range of the distance model.

      //   clampedRolloff - The rolloffFactor (above) clamped to the nominal

      //                    range for the given distance model.

      function runTest(should, options) {

        // Offline context with two channels.  The first channel is the panner

        // node under test.  The second channel is the reference panner node.

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

        // The source for the panner nodes.  This is fairly arbitrary.

        let src = new OscillatorNode(context, {type: 'sawtooth'});

        // Create the test panner with the specified rolloff factor.  The

        // position is fairly arbitrary, but something that is not the default

        // is good to show the distance model had some effect.

        let pannerTest = new PannerNode(context, {

          rolloffFactor: options.rolloffFactor,

          distanceModel: options.distanceModel,

          positionX: 5000

});

        // Create the reference panner with the rolloff factor clamped to the

        // appropriate limit.

        let pannerRef = new PannerNode(context, {

          rolloffFactor: options.clampedRolloff,

          distanceModel: options.distanceModel,

          positionX: 5000

});

        // Connect the source to the panners to the destination appropriately.

        let merger = new ChannelMergerNode(context, {numberOfInputs: 2});

        src.connect(pannerTest).connect(merger, 0, 0);

        src.connect(pannerRef).connect(merger, 0, 1);

        merger.connect(context.destination);

        src.start();

        return context.startRendering().then(function(resultBuffer) {

          // The two channels should be the same due to the clamping.  Verify

          // that they are the same.

          let actual = resultBuffer.getChannelData(0);

          let expected = resultBuffer.getChannelData(1);

          let message = 'Panner distanceModel: "' + options.distanceModel +

              '", rolloffFactor: ' + options.rolloffFactor;

          should(actual, message).beEqualToArray(expected);

});

      audit.run();

    </script>

  </body>

</html>