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<!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.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
// 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.
let sampleRate = 16384;
let renderLength = 8 * RENDER_QUANTUM_FRAMES;
let context;
let filePath = 'processors/input-length-processor.js';
let testChannelValues = [1, 2, 3];
// Creates a 3-channel buffer and play with BufferSourceNode. The source
// goes through a bypass AudioWorkletNode (gain value of 1).
audit.define(
{
label: 'test',
description:
'Input array length should be zero for disconnected input'
},
(task, should) => {
context = new OfflineAudioContext({
numberOfChannels: 1,
length: renderLength,
sampleRate: sampleRate
});
context.audioWorklet.addModule(filePath).then(() => {
let sourceNode = new ConstantSourceNode(context);
let workletNode =
new AudioWorkletNode(context, 'input-length-processor');
workletNode.connect(context.destination);
// Connect the source now.
let connectFrame = RENDER_QUANTUM_FRAMES;
context.suspend(connectFrame / sampleRate)
.then(() => {
sourceNode.connect(workletNode);
})
.then(() => context.resume());
;
// Then disconnect the source after a few renders
let disconnectFrame = 3 * RENDER_QUANTUM_FRAMES;
context.suspend(disconnectFrame / sampleRate)
.then(() => {
sourceNode.disconnect(workletNode);
})
.then(() => context.resume());
sourceNode.start();
context.startRendering()
.then(resultBuffer => {
let data = resultBuffer.getChannelData(0);
should(
data.slice(0, connectFrame),
'Before connecting the source: Input array length')
.beConstantValueOf(0);
// Find where the output is no longer 0.
let nonZeroIndex = data.findIndex(x => x > 0);
should(nonZeroIndex, 'First non-zero output')
.beEqualTo(connectFrame);
should(
data.slice(
nonZeroIndex,
nonZeroIndex + (disconnectFrame - connectFrame)),
'While source is connected: Input array length')
.beConstantValueOf(RENDER_QUANTUM_FRAMES);
should(
data.slice(disconnectFrame),
'After disconnecting the source: Input array length')
.beConstantValueOf(0);
})
.then(() => task.done());
});
});
audit.run();
</script>
</body>
</html>
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