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<head>
<title>
Test setTargetAtTime with timeConstant=0
</title>
<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../resources/audit.js"></script>
</head>
<body>
<script id="layout-test-code">
// Fairly arbitrary sample rate and number of frames, so choose a low
// sample rate, and short rendering length.
let sampleRate = 8000;
let renderFrames = 128;
// Array specifying parameters for setTargetAtTime. |frame| is the frame
// (not necessarily an integer) at which setTargetAtTime starts, and
// |value| is the target value. Non-integral values for |frame| tests
// that we started the setTargetAtTime at the right time.
let targetValueInfo = [
{frame: 10.1, value: 0}, {frame: 20.3, value: 0.5},
{frame: 100.5, value: 1}
];
let audit = Audit.createTaskRunner();
audit.define('timeconstant-0', (task, should) => {
let context = new OfflineAudioContext(1, renderFrames, sampleRate);
// Simple constant source for testing.
let src = new ConstantSourceNode(context);
// We're going to automate the gain node to test setTargetAtTime.
let gain = new GainNode(context, {gain: 1});
src.connect(gain).connect(context.destination);
for (let k = 0; k < targetValueInfo.length; ++k) {
gain.gain.setTargetAtTime(
targetValueInfo[k].value,
targetValueInfo[k].frame / context.sampleRate, 0);
}
src.start();
context.startRendering()
.then(function(resultBuffer) {
let result = resultBuffer.getChannelData(0);
let success = true;
// Because the time constant is 0, the automation should instantly
// jump to the target value at the start time. Verify that the
// output has the expected value.
for (let k = 0; k < targetValueInfo.length; ++k) {
let startFrame = Math.ceil(targetValueInfo[k].frame);
let endFrame = k < targetValueInfo.length - 1 ?
Math.ceil(targetValueInfo[k + 1].frame) :
renderFrames;
let value = targetValueInfo[k].value;
should(
result.slice(startFrame, endFrame),
'Output for frame [' + startFrame + ', ' + endFrame + ')')
.beConstantValueOf(value);
}
})
.then(() => task.done());
});
audit.run();
</script>
</body>
</html>