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<!DOCTYPE HTML>
<html>
<head>
<title>Test AudioParam.exponentialRampToValue</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="webaudio.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
var V0 = 0.1;
var V1 = 0.9;
var T0 = 0;
var gTest = {
length: 2048,
numberOfChannels: 1,
createGraph(context) {
var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
sourceBuffer.getChannelData(0)[i] = 1;
}
var source = context.createBufferSource();
source.buffer = sourceBuffer;
var gain = context.createGain();
gain.gain.setValueAtTime(V0, 0);
gain.gain.exponentialRampToValueAtTime(V1, 2048/context.sampleRate);
source.connect(gain);
source.start(0);
return gain;
},
createExpectedBuffers(context) {
var T1 = 2048 / context.sampleRate;
var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
var t = i / context.sampleRate;
expectedBuffer.getChannelData(0)[i] = V0 * Math.pow(V1 / V0, (t - T0) / (T1 - T0));
}
return expectedBuffer;
},
};
SimpleTest.waitForExplicitFinish();
// Comparing different AudioContexts may result in different timing reated information being reported
// when we jitter time, as they are on different Relative Timelines.
SpecialPowers.pushPrefEnv({"set": [["privacy.resistFingerprinting.reduceTimerPrecision.jitter", false]]}, runTest);
</script>
</pre>
</body>
</html>
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