<!DOCTYPE html>
<html>
  <head>
    <title>
      Test AudioWorkletNode's automatic pull feature
    </title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/webaudio/resources/audit.js"></script>
    <script src="/webaudio/resources/audit-util.js"></script>
  </head>
  <body>
    <script id="layout-test-code">
      const audit = Audit.createTaskRunner();

      // Arbitrary sample rate. Anything should work.
      const sampleRate = 48000;
      const renderLength = RENDER_QUANTUM_FRAMES * 2;
      const channelCount = 1;
      const filePath = 'processors/zero-output-processor.js';

      const sourceOffset = 0.5;

      // Connect a constant source node to the zero-output AudioWorkletNode.
      // Then verify if it captures the data correctly.
      audit.define('setup-worklet', (task, should) => {
        const context =
            new OfflineAudioContext(channelCount, renderLength, sampleRate);

        context.audioWorklet.addModule(filePath).then(() => {
          let testSource =
              new ConstantSourceNode(context, { offset: sourceOffset });
          let zeroOutputWorkletNode =
              new AudioWorkletNode(context, 'zero-output-processor', {
                numberOfInputs: 1,
                numberOfOutputs: 0,
                processorOptions: {
                  bufferLength: renderLength,
                  channeCount: channelCount
                }
              });

          // Start the source and stop at the first render quantum.
          testSource.connect(zeroOutputWorkletNode);
          testSource.start();
          testSource.stop(RENDER_QUANTUM_FRAMES/sampleRate);

          zeroOutputWorkletNode.port.onmessage = (event) => {
            // The |capturedBuffer| can be multichannel. Iterate through it.
            for (let i = 0; i < event.data.capturedBuffer.length; ++i) {
              let buffer = event.data.capturedBuffer[i];
              // Split the captured buffer in half for the easier test.
              should(buffer.subarray(0, RENDER_QUANTUM_FRAMES),
                     'The first half of the captured buffer')
                  .beConstantValueOf(sourceOffset);
              should(buffer.subarray(RENDER_QUANTUM_FRAMES, renderLength),
                     'The second half of the captured buffer')
                  .beConstantValueOf(0);
            }
            task.done();
          };

          // Starts the rendering, but we don't need the rendered buffer from
          // the context.
          context.startRendering();
        });
      });

      audit.run();
    </script>
  </body>
</html>

