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<!DOCTYPE HTML>
<html>
<head>
<title>Test AudioParam.linearRampToValue</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 T0 = 0;
var gTest = {
length: 2048,
numberOfChannels: 1,
createGraph(context) {
var source = context.createConstantSource();
var gain = context.createGain();
gain.gain.setValueCurveAtTime(this.curve, T0, this.duration);
source.connect(gain);
source.start(0);
return gain;
},
createExpectedBuffers(context) {
this.duration = 1024 / context.sampleRate;
this.curve = new Float32Array([1.0, 0.5, 0.75, 0.25]);
var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
var data = expectedBuffer.getChannelData(0);
var step = 1024 / 3;
for (var i = 0; i < 2048; ++i) {
if (i < step) {
data[i] = 1.0 - 0.5*i/step;
} else if (i < 2*step) {
data[i] = 0.5 + 0.25*(i - step)/step;
} else if (i < 3*step) {
data[i] = 0.75 - 0.5*(i - 2*step)/step;
} else {
data[i] = 0.25;
}
}
return expectedBuffer;
},
};
runTest();
</script>
</pre>
</body>
</html>
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