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<!DOCTYPE html>
<html>
<head>
<title>
Test setValueCurveAtTime with Huge Duration
</title>
<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../resources/audit-util.js"></script>
<script src="../resources/audit.js"></script>
<script src="../resources/audioparam-testing.js"></script>
</head>
<body>
<script id="layout-test-code">
let sampleRate = 48000;
let renderFrames = 1000;
let audit = Audit.createTaskRunner();
audit.define('long duration', (task, should) => {
// We only need to generate a small number of frames for this test.
let context = new OfflineAudioContext(1, renderFrames, sampleRate);
let src = context.createBufferSource();
// Constant source of amplitude 1, looping.
src.buffer = createConstantBuffer(context, 1, 1);
src.loop = true;
// Automate the gain with a setValueCurve with a very long duration.
// The duration should produce a frame number greater than 2^64 (larger
// than the largest size_t value).
let gain = context.createGain();
let duration = Math.pow(2, 64);
let curve = Float32Array.from([0, 1]);
gain.gain.setValueCurveAtTime(curve, 0, duration);
// Create the graph and go!
src.connect(gain);
gain.connect(context.destination);
src.start();
context.startRendering()
.then(function(result) {
// Find the maximum value of the buffer.
let max = Math.max.apply(null, result.getChannelData(0));
// The automation does linear interpolation between 0 and 1 from
// time 0 to duration. Hence the max value of the interpolation
// occurs at the end of the rendering. Compute this value.
let expectedMax = (renderFrames / sampleRate) * (1 / duration);
let message =
'setValueCurve([' + curve + '], 0, ' + duration + ')';
should(max, 'Max amplitude of ' + message)
.beLessThanOrEqualTo(expectedMax);
})
.then(() => task.done());
});
audit.run();
</script>
</body>
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