1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_periodicWave.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,94 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test the PeriodicWave interface</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="webaudio.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +SimpleTest.waitForExplicitFinish();
1.17 +
1.18 +// real and imag are used in separate PeriodicWaves to make their peak values
1.19 +// easy to determine.
1.20 +const realMax = 99;
1.21 +var real = new Float32Array(realMax + 1);
1.22 +real[1] = 2.0; // fundamental
1.23 +real[realMax] = 3.0;
1.24 +const realPeak = real[1] + real[realMax];
1.25 +const realFundamental = 19.0;
1.26 +var imag = new Float32Array(4);
1.27 +imag[0] = 6.0; // should be ignored.
1.28 +imag[3] = 0.5;
1.29 +const imagPeak = imag[3];
1.30 +const imagFundamental = 551.0;
1.31 +
1.32 +const testLength = 4096;
1.33 +
1.34 +addLoadEvent(function() {
1.35 + var ac = new AudioContext();
1.36 + ac.createPeriodicWave(new Float32Array(4096), new Float32Array(4096));
1.37 + expectException(function() {
1.38 + ac.createPeriodicWave(new Float32Array(512), imag);
1.39 + }, DOMException.NOT_SUPPORTED_ERR);
1.40 + expectException(function() {
1.41 + ac.createPeriodicWave(new Float32Array(0), new Float32Array(0));
1.42 + }, DOMException.NOT_SUPPORTED_ERR);
1.43 + expectException(function() {
1.44 + ac.createPeriodicWave(new Float32Array(4097), new Float32Array(4097));
1.45 + }, DOMException.NOT_SUPPORTED_ERR);
1.46 +
1.47 + runTest();
1.48 +});
1.49 +
1.50 +var gTest = {
1.51 + createGraph: function(context) {
1.52 + var merger = context.createChannelMerger();
1.53 +
1.54 + var osc0 = context.createOscillator();
1.55 + var osc1 = context.createOscillator();
1.56 +
1.57 + osc0.setPeriodicWave(context.
1.58 + createPeriodicWave(real,
1.59 + new Float32Array(real.length)));
1.60 + osc1.setPeriodicWave(context.
1.61 + createPeriodicWave(new Float32Array(imag.length),
1.62 + imag));
1.63 +
1.64 + osc0.frequency.value = realFundamental;
1.65 + osc1.frequency.value = imagFundamental;
1.66 +
1.67 + osc0.start();
1.68 + osc1.start();
1.69 +
1.70 + osc0.connect(merger, 0, 0);
1.71 + osc1.connect(merger, 0, 1);
1.72 +
1.73 + return merger;
1.74 + },
1.75 + createExpectedBuffers: function(context) {
1.76 + var buffer = context.createBuffer(2, testLength, context.sampleRate);
1.77 +
1.78 + for (var i = 0; i < buffer.length; ++i) {
1.79 +
1.80 + buffer.getChannelData(0)[i] = 1.0 / realPeak *
1.81 + (real[1] * Math.cos(2 * Math.PI * realFundamental * i /
1.82 + context.sampleRate) +
1.83 + real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
1.84 + context.sampleRate));
1.85 +
1.86 + buffer.getChannelData(1)[i] = 1.0 / imagPeak *
1.87 + imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i /
1.88 + context.sampleRate);
1.89 + }
1.90 + return buffer;
1.91 + },
1.92 +};
1.93 +
1.94 +</script>
1.95 +</pre>
1.96 +</body>
1.97 +</html>
