audioworkletnode-output-channel-count.https.html

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This test has a WPT meta file that expects 3 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-audioworklet-interface/audioworkletnode-output-channel-count.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      Test the construction of AudioWorkletNode with real-time context

    </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">

      const audit = Audit.createTaskRunner();

      const context = new AudioContext();

      setup(function () {

        context.audioWorklet.addModule(

          'processors/channel-count-processor.js').then(() => audit.run());

        // Test if the output channe count dynamically changes if the input

        // and output is 1.

        audit.define(

            {label: 'Dynamically change the channel count to if unspecified.'},

            (task, should) => {

              // Use arbitrary parameters for the test.

              const buffer = new AudioBuffer({

                numberOfChannels: 17,

                length: 1,

                sampleRate: context.sampleRate,

});

              const source = new AudioBufferSourceNode(context);

              source.buffer = buffer;

              const node = new AudioWorkletNode(context, 'channel-count', {

                numberOfInputs: 1,

                numberOfOutputs: 1,

});

              node.port.onmessage = (message) => {

                const expected = message.data;

                should(expected.outputChannel,

                       'The expected output channel count').beEqualTo(17);

                task.done();

};

              // We need to make an actual connection becasue the channel count

              // change happen when the rendering starts. It is to test if the

              // channel count adapts to the upstream node correctly.

              source.connect(node).connect(context.destination);

              source.start();

});

        // Test if outputChannelCount is honored as expected even if the input

        // and output is 1.

        audit.define(

            {label: 'Givien outputChannelCount must be honored.'},

            (task, should) => {

              const node = new AudioWorkletNode(

                  context, 'channel-count', {

                    numberOfInputs: 1,

                    numberOfOutputs: 1,

                    outputChannelCount: [2],

});

              node.port.onmessage = (message) => {

                const expected = message.data;

                should(expected.outputChannel,

                       'The expected output channel count').beEqualTo(2);

                task.done();

};

              // We need to make an actual connection becasue the channel count

              // change might happen when the rendering starts. It is to test

              // if the specified channel count is kept correctly.

              node.connect(context.destination);

});

});

    </script>

  </body>

</html>