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<!DOCTYPE HTML>
<html>
<head>
<title>Test the PeriodicWave interface</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">
SimpleTest.waitForExplicitFinish();
// real and imag are used in separate PeriodicWaves to make their peak values
// easy to determine.
const realMax = 99;
var real = new Float32Array(realMax + 1);
real[1] = 2.0; // fundamental
real[realMax] = 3.0;
const realPeak = real[1] + real[realMax];
const realFundamental = 19.0;
var imag = new Float32Array(4);
imag[0] = 6.0; // should be ignored.
imag[3] = 0.5;
const imagPeak = imag[3];
const imagFundamental = 551.0;
const testLength = 4096;
addLoadEvent(function() {
var ac = new AudioContext();
ac.createPeriodicWave(new Float32Array(4096), new Float32Array(4096));
expectException(function() {
ac.createPeriodicWave(new Float32Array(512), imag);
}, DOMException.NOT_SUPPORTED_ERR);
expectException(function() {
ac.createPeriodicWave(new Float32Array(0), new Float32Array(0));
}, DOMException.NOT_SUPPORTED_ERR);
expectNoException(function() {
ac.createPeriodicWave(new Float32Array(4097), new Float32Array(4097));
});
runTest();
});
var gTest = {
createGraph: function(context) {
var merger = context.createChannelMerger();
var osc0 = context.createOscillator();
var osc1 = context.createOscillator();
osc0.setPeriodicWave(context.
createPeriodicWave(real,
new Float32Array(real.length)));
osc1.setPeriodicWave(context.
createPeriodicWave(new Float32Array(imag.length),
imag));
osc0.frequency.value = realFundamental;
osc1.frequency.value = imagFundamental;
osc0.start();
osc1.start();
osc0.connect(merger, 0, 0);
osc1.connect(merger, 0, 1);
return merger;
},
createExpectedBuffers: function(context) {
var buffer = context.createBuffer(2, testLength, context.sampleRate);
for (var i = 0; i < buffer.length; ++i) {
buffer.getChannelData(0)[i] = 1.0 / realPeak *
(real[1] * Math.cos(2 * Math.PI * realFundamental * i /
context.sampleRate) +
real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
context.sampleRate));
buffer.getChannelData(1)[i] = 1.0 / imagPeak *
imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i /
context.sampleRate);
}
return buffer;
},
};
</script>
</pre>
</body>
</html>
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