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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>