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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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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>