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<!DOCTYPE HTML>
<html>
<head>
<title>Test AudioParam.setValueCurveAtTime twice</title>
<script type="text/javascript" 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">
function linearInterpolate(t0, v0, t1, v1, t)
{
return v0 + (v1 - v0) * ((t - t0) / (t1 - t0));
}
var T0 = 0;
var gTest = {
length: 2048,
numberOfChannels: 1,
createGraph: function(context) {
var curve2 = new Float32Array(100);
for (var i = 0; i < 100; ++i) {
curve2[i] = Math.sin(220 * 6 * Math.PI * i / context.sampleRate);
}
var source = context.createConstantSource();
var gain = context.createGain();
gain.gain.setValueCurveAtTime(curve2, T0, this.duration/2);
//Set a different curve from the first one
gain.gain.setValueCurveAtTime(this.curve, T0, this.duration);
source.connect(gain);
source.start(0);
return gain;
},
createExpectedBuffers: function(context) {
this.duration = 1024 / context.sampleRate;
this.curve = new Float32Array(100);
for (var i = 0; i < 100; ++i) {
this.curve[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
}
var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
for (var i = 0; i < 2048; ++i) {
step = 1024.0/99.0;
var current = Math.floor(i / step);
var next = current + 1;
if (next < this.curve.length) {
expectedBuffer.getChannelData(0)[i] = linearInterpolate(current*step, this.curve[current], next*step, this.curve[next], i);
} else {
expectedBuffer.getChannelData(0)[i] = this.curve[99];
}
}
return expectedBuffer;
},
};
runTest();
</script>
</pre>
</body>
</html>
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