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<!DOCTYPE HTML>
<html>
<head>
<title>Test DelayNode</title>
<script type="text/javascript" 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: function(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;
source.connect(delay);
ok(delay.delayTime, "The audioparam member must exist");
is(delay.delayTime.value, 0, "Correct initial value");
is(delay.delayTime.defaultValue, 0, "Correct default value");
delay.delayTime.value = 0.5;
is(delay.delayTime.value, 0.5, "Correct initial value");
is(delay.delayTime.defaultValue, 0, "Correct default value");
is(delay.channelCount, 2, "delay node has 2 input channels by default");
is(delay.channelCountMode, "max", "Correct channelCountMode for the delay node");
is(delay.channelInterpretation, "speakers", "Correct channelCountInterpretation for the delay node");
expectException(function() {
context.createDelay(0);
}, DOMException.NOT_SUPPORTED_ERR);
expectException(function() {
context.createDelay(180);
}, DOMException.NOT_SUPPORTED_ERR);
expectTypeError(function() {
context.createDelay(NaN);
}, DOMException.NOT_SUPPORTED_ERR);
expectException(function() {
context.createDelay(-1);
}, DOMException.NOT_SUPPORTED_ERR);
context.createDelay(1); // should not throw
// Delay the source stream by 2048 frames
delay.delayTime.value = 2048 / context.sampleRate;
source.start(0);
return delay;
},
createExpectedBuffers: function(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);
}
return expectedBuffer;
},
};
runTest();
</script>
</pre>
</body>
</html>
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