<!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>
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