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<!DOCTYPE HTML>
<html>
<head>
<title>Test DelayNode with a GainNode</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script src="webaudio.js" type="text/javascript"></script>
<script class="testbody" type="text/javascript">
var gTest = {
length: 4096,
numberOfChannels: 1,
createGraph(context) {
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();
var delay = context.createDelay();
source.buffer = buffer;
var gain = context.createGain();
gain.gain.value = 0.5;
source.connect(gain);
gain.connect(delay);
// Delay the source stream by 2048 frames
delay.delayTime.value = 2048 / context.sampleRate;
source.start(0);
return delay;
},
createExpectedBuffers(context) {
var expectedBuffer = context.createBuffer(1, 2048 * 2, context.sampleRate);
for (var i = 2048; i < 2048 * 2; ++i) {
expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * (i - 2048) / context.sampleRate) / 2;
}
return expectedBuffer;
},
};
runTest();
</script>
</pre>
</body>
</html>
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