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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test AudioParam.linearRampToValue</title>
+ <script 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">
+
+var T0 = 0;
+
+var gTest = {
+ length: 2048,
+ numberOfChannels: 1,
+ createGraph(context) {
+ var source = context.createConstantSource();
+
+ var gain = context.createGain();
+ gain.gain.setValueCurveAtTime(this.curve, T0, this.duration);
+ source.connect(gain);
+
+ source.start(0);
+ return gain;
+ },
+ createExpectedBuffers(context) {
+ this.duration = 1024 / context.sampleRate;
+ this.curve = new Float32Array([1.0, 0.5, 0.75, 0.25]);
+ var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
+ var data = expectedBuffer.getChannelData(0);
+ var step = 1024 / 3;
+ for (var i = 0; i < 2048; ++i) {
+ if (i < step) {
+ data[i] = 1.0 - 0.5*i/step;
+ } else if (i < 2*step) {
+ data[i] = 0.5 + 0.25*(i - step)/step;
+ } else if (i < 3*step) {
+ data[i] = 0.75 - 0.5*(i - 2*step)/step;
+ } else {
+ data[i] = 0.25;
+ }
+ }
+ return expectedBuffer;
+ },
+};
+
+runTest();
+
+</script>
+</pre>
+</body>
+</html>