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<!doctype html>
<html>
<head>
<title>
Test Active Processing for ChannelMergerNode
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit.js"></script>
</head>
<body>
<script id="layout-test-code">
// AudioProcessor that sends a message to its AudioWorkletNode whenver the
// number of channels on its input changes.
let filePath =
'../the-audioworklet-interface/processors/active-processing.js';
const audit = Audit.createTaskRunner();
let context;
audit.define('initialize', (task, should) => {
// Create context and load the module
context = new AudioContext();
should(
context.audioWorklet.addModule(filePath),
'AudioWorklet module loading')
.beResolved()
.then(() => task.done());
});
audit.define('test', (task, should) => {
const src = new OscillatorNode(context);
// Number of inputs for the ChannelMergerNode. Pretty arbitrary, but
// should not be 1.
const numberOfInputs = 7;
const merger =
new ChannelMergerNode(context, {numberOfInputs: numberOfInputs});
const testerNode =
new AudioWorkletNode(context, 'active-processing-tester', {
// Use as short a duration as possible to keep the test from
// taking too much time.
processorOptions: {testDuration: .5},
});
// Expected number of output channels from the merger node. We should
// start with the number of inputs, because the source (oscillator) is
// actively processing. When the source stops, the number of channels
// should change to 0.
const expectedValues = [numberOfInputs, 0];
let index = 0;
testerNode.port.onmessage = event => {
let count = event.data.channelCount;
let finished = event.data.finished;
// If we're finished, end testing.
if (finished) {
// Verify that we got the expected number of changes.
should(index, 'Number of distinct values')
.beEqualTo(expectedValues.length);
task.done();
return;
}
if (index < expectedValues.length) {
// Verify that the number of channels matches the expected number of
// channels.
should(count, `Test ${index}: Number of convolver output channels`)
.beEqualTo(expectedValues[index]);
}
++index;
};
// Create the graph and go
src.connect(merger).connect(testerNode).connect(context.destination);
src.start();
// Stop the source after a short time so we can test that the channel
// merger changes to not actively processing and thus produces a single
// channel of silence.
src.stop(context.currentTime + .1);
});
audit.run();
</script>
</body>
</html>
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