audioworkletnode-output-channel-count.https.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 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>

  </head>

  <body>

    <script>

      const processorUrl = 'processors/channel-count-processor.js';

      const waitForMessageFromPort = (port) => {

        return new Promise(resolve => {

          port.onmessage = e => resolve(e.data);

});

};

      promise_test(async t => {

        const context = new AudioContext();

        await context.audioWorklet.addModule(processorUrl);

          const buffer = new AudioBuffer({

            numberOfChannels: 17,

            length: 1,

            sampleRate: context.sampleRate,

});

          const source = new AudioBufferSourceNode(context, { buffer });

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

            numberOfInputs: 1,

            numberOfOutputs: 1,

});

          const promiseMessage = waitForMessageFromPort(node.port);

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

          source.start();

          const { outputChannel } = await promiseMessage;

          assert_equals(

              outputChannel,

17,

              'Output channel count should follow upstream (17).');

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

            numberOfInputs: 1,

            numberOfOutputs: 1,

            outputChannelCount: [2],

});

          const promiseMessage = waitForMessageFromPort(node.port);

          node.connect(context.destination);

          const { outputChannel } = await promiseMessage;

          assert_equals(

              outputChannel,

2,

              'Explicit outputChannelCount [2] must be honored.');

      }, `AudioWorkletNode channel count: dynamic propagation and `+

          `honoring outputChannelCount (single serialized test).`);

    </script>

  </body>

</html>