1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_audioParamSetTargetAtTime.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test AudioParam.setTargetAtTime</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 +var V0 = 0.9;
1.17 +var V1 = 0.1;
1.18 +var T0 = 0;
1.19 +var TimeConstant = 10;
1.20 +
1.21 +var gTest = {
1.22 + length: 2048,
1.23 + numberOfChannels: 1,
1.24 + createGraph: function(context) {
1.25 + var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate);
1.26 + for (var i = 0; i < 2048; ++i) {
1.27 + sourceBuffer.getChannelData(0)[i] = 1;
1.28 + }
1.29 +
1.30 + var source = context.createBufferSource();
1.31 + source.buffer = sourceBuffer;
1.32 +
1.33 + var gain = context.createGain();
1.34 + gain.gain.value = V0;
1.35 + gain.gain.setTargetAtTime(V1, T0, TimeConstant);
1.36 +
1.37 + source.connect(gain);
1.38 +
1.39 + source.start(0);
1.40 + return gain;
1.41 + },
1.42 + createExpectedBuffers: function(context) {
1.43 + var T1 = 2048 / context.sampleRate;
1.44 + var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
1.45 + for (var i = 0; i < 2048; ++i) {
1.46 + var t = i / context.sampleRate;
1.47 + expectedBuffer.getChannelData(0)[i] = V1 + (V0 - V1) * Math.exp(-(t - T0) / TimeConstant);
1.48 + }
1.49 + return expectedBuffer;
1.50 + },
1.51 +};
1.52 +
1.53 +runTest();
1.54 +
1.55 +</script>
1.56 +</pre>
1.57 +</body>
1.58 +</html>
