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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test GainNode</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 gTest = {
+ length: 2048,
+ numberOfChannels: 1,
+ createGraph(context) {
+
+ var gain = new GainNode(context);
+ ok(gain.gain, "The audioparam member must exist");
+ is(gain.gain.value, 1.0, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+ gain.gain.value = 0.5;
+ is(gain.gain.value, 0.5, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+
+ gain = new GainNode(context, { gain: 0.5 });
+ ok(gain.gain, "The audioparam member must exist");
+ is(gain.gain.value, 0.5, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+ gain.gain.value = 0.5;
+ is(gain.gain.value, 0.5, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+
+ var buffer = context.createBuffer(1, 2048, context.sampleRate);
+ for (var i = 0; i < 2048; ++i) {
+ buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
+ }
+
+ var source = context.createBufferSource();
+ source.buffer = buffer;
+
+ gain = context.createGain();
+ source.connect(gain);
+
+ ok(gain.gain, "The audioparam member must exist");
+ is(gain.gain.value, 1.0, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+ gain.gain.value = 0.5;
+ is(gain.gain.value, 0.5, "Correct initial value");
+ is(gain.gain.defaultValue, 1.0, "Correct default value");
+ is(gain.channelCount, 2, "gain node has 2 input channels by default");
+ is(gain.channelCountMode, "max", "Correct channelCountMode for the gain node");
+ is(gain.channelInterpretation, "speakers", "Correct channelCountInterpretation for the gain node");
+
+ source.start(0);
+ return gain;
+ },
+ createExpectedBuffers(context) {
+ var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
+ for (var i = 0; i < 2048; ++i) {
+ expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate) / 2;
+ }
+ return expectedBuffer;
+ },
+};
+
+runTest();
+
+</script>
+</pre>
+</body>
+</html>