audioworkletnode-disconnected-input.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-disconnected-input.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      Test AudioWorkletNode's Disconnected Input Array Length

    </title>

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

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

    <script src="/webaudio/resources/audit-util.js"></script>

  </head>

  <body>

    <script>

      // Arbitrary numbers used to align the test with render quantum boundary.

      // The sample rate is a power of two to eliminate roundoff in computing

      // the suspend time needed for the test.

      const sampleRate = 16384;

      const renderLength = 8 * RENDER_QUANTUM_FRAMES;

      const filePath = 'processors/input-length-processor.js';

      // Creates a 3-channel buffer and play with BufferSourceNode. The source

      // goes through a bypass AudioWorkletNode (gain value of 1).

      promise_test(async () => {

        const context = new OfflineAudioContext({

          numberOfChannels: 1,

          length: renderLength,

          sampleRate: sampleRate

});

        await context.audioWorklet.addModule(filePath);

        const sourceNode = new ConstantSourceNode(context);

        const workletNode =

            new AudioWorkletNode(context, 'input-length-processor');

        workletNode.connect(context.destination);

        // Connect the source after one render quantum.

        const connectFrame = RENDER_QUANTUM_FRAMES;

        context.suspend(connectFrame / sampleRate).then(() => {

          sourceNode.connect(workletNode);

          return context.resume();

});

        // Disconnect the source after three render quanta.

        const disconnectFrame = 3 * RENDER_QUANTUM_FRAMES;

        context.suspend(disconnectFrame / sampleRate).then(() => {

          sourceNode.disconnect(workletNode);

          return context.resume();

});

        sourceNode.start();

        const resultBuffer = await context.startRendering();

        const data = resultBuffer.getChannelData(0);

        // Before connecting the source: input array length should be 0.

        assert_array_equals(

            data.subarray(0, connectFrame),

            new Float32Array(connectFrame),

            'Before connecting the source: Input array length should be 0');

        // Find where the output is no longer 0.

        const nonZeroIndex = data.findIndex(x => x > 0);

        assert_equals(

            nonZeroIndex,

            connectFrame,

            'First non-zero output should occur exactly at connectFrame');

        // While source is connected: Input array length

        // should be RENDER_QUANTUM_FRAMES

          const expectedLength = disconnectFrame - connectFrame;

          const expected =

              new Float32Array(expectedLength).fill(RENDER_QUANTUM_FRAMES);

          assert_array_equals(

              data.subarray(connectFrame, disconnectFrame), expected,

              'While source is connected: Input array length');

        // After disconnecting the source: Input array length should be zero

          const expectedLength = data.length - disconnectFrame;

          const expected = new Float32Array(expectedLength);

          assert_array_equals(

              data.subarray(disconnectFrame), expected,

              'After disconnecting the source: Input array length');

      }, 'Input array length should be zero for disconnected input');

    </script>

  </body>

</html>