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<!doctype html>
<html>
<head>
<title>Test k-rate AudioParams of OscillatorNode</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audit.js"></script>
</head>
<body>
<script>
let audit = Audit.createTaskRunner();
// Arbitrary sample rate and duration.
let sampleRate = 8000;
// Only new a few render quanta to verify things are working.
let testDuration = 4 * 128 / sampleRate;
[{name: 'detune', initial: 0, final: 1200}, {
name: 'frequency',
initial: 440,
final: sampleRate / 2
}].forEach(paramProperty => {
audit.define(
'Oscillator k-rate ' + paramProperty.name, (task, should) => {
let context = new OfflineAudioContext({
numberOfChannels: 3,
sampleRate: sampleRate,
length: testDuration * sampleRate
});
let merger = new ChannelMergerNode(
context, {numberOfInputs: context.destination.channelCount});
merger.connect(context.destination);
let inverter = new GainNode(context, {gain: -1});
inverter.connect(merger, 0, 2);
let kRateNode = new OscillatorNode(context);
let aRateNode = new OscillatorNode(context);
kRateNode.connect(merger, 0, 0);
aRateNode.connect(merger, 0, 1);
kRateNode.connect(merger, 0, 2);
aRateNode.connect(inverter);
// Set the rate
kRateNode[paramProperty.name].automationRate = 'k-rate';
// Automate the offset
kRateNode[paramProperty.name].setValueAtTime(
paramProperty.initial, 0);
kRateNode[paramProperty.name].linearRampToValueAtTime(
paramProperty.final, testDuration);
aRateNode[paramProperty.name].setValueAtTime(
paramProperty.initial, 0);
aRateNode[paramProperty.name].linearRampToValueAtTime(
paramProperty.final, testDuration);
kRateNode.start();
aRateNode.start();
context.startRendering()
.then(audioBuffer => {
let kRateOut = audioBuffer.getChannelData(0);
let aRateOut = audioBuffer.getChannelData(1);
let diff = audioBuffer.getChannelData(2);
// Verify that the outputs are different.
should(
diff,
'k-rate ' + paramProperty.name +
': Difference between a-rate and k-rate outputs')
.notBeConstantValueOf(0);
})
.then(() => task.done());
});
});
audit.run();
</script>
</body>
</html>
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