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<!DOCTYPE html>
<html>
<head>
<title>
Test AudioWorkletNode's basic AudioParam features
</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">
let audit = Audit.createTaskRunner();
let sampleRate = 48000;
let renderLength = 48000 * 0.6;
let context;
let filePath = 'processors/gain-processor.js';
// Sets up AudioWorklet and OfflineAudioContext.
audit.define('Initializing AudioWorklet and Context', (task, should) => {
context = new OfflineAudioContext(1, renderLength, sampleRate);
context.audioWorklet.addModule(filePath).then(() => {
task.done();
});
});
// Verifies the functionality of AudioParam in AudioWorkletNode by
// comparing (canceling out) values from GainNode and AudioWorkletNode
// with simple gain computation code by AudioParam.
audit.define(
'Verifying AudioParam in AudioWorkletNode',
(task, should) => {
let constantSourceNode = new ConstantSourceNode(context);
let gainNode = new GainNode(context);
let inverterNode = new GainNode(context, {gain: -1});
let gainWorkletNode = new AudioWorkletNode(context, 'gain');
let gainWorkletParam = gainWorkletNode.parameters.get('gain');
// Test default value and setter/getter functionality.
should(gainWorkletParam.value,
'Default gain value of gainWorkletNode')
.beEqualTo(Math.fround(0.707));
gainWorkletParam.value = 0.1;
should(gainWorkletParam.value,
'Value of gainWorkletParam after setter = 0.1')
.beEqualTo(Math.fround(0.1));
constantSourceNode.connect(gainNode)
.connect(inverterNode)
.connect(context.destination);
constantSourceNode.connect(gainWorkletNode)
.connect(context.destination);
// With arbitrary times and values, test all possible AudioParam
// automations.
[gainNode.gain, gainWorkletParam].forEach((param) => {
param.setValueAtTime(0, 0);
param.linearRampToValueAtTime(1, 0.1);
param.exponentialRampToValueAtTime(0.5, 0.2);
param.setValueCurveAtTime([0, 2, 0.3], 0.2, 0.1);
param.setTargetAtTime(0.01, 0.4, 0.5);
});
// Test if the setter works correctly in the middle of rendering.
context.suspend(0.5).then(() => {
gainNode.gain.value = 1.5;
gainWorkletParam.value = 1.5;
context.resume();
});
constantSourceNode.start();
context.startRendering().then((renderedBuffer) => {
should(renderedBuffer.getChannelData(0),
'The rendered buffer')
.beConstantValueOf(0);
task.done();
});
});
audit.run();
</script>
</body>
</html>
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