зеркало из https://github.com/mozilla/gecko-dev.git
55 строки
1.4 KiB
HTML
55 строки
1.4 KiB
HTML
<!DOCTYPE HTML>
|
|
<html>
|
|
<head>
|
|
<title>Test AudioParam.setTargetAtTime where the target time is the same as the time of a previous event</title>
|
|
<script type="text/javascript" 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 V0 = 0.9;
|
|
var V1 = 0.1;
|
|
var T0 = 0;
|
|
var TimeConstant = 0.1;
|
|
|
|
var gTest = {
|
|
length: 2048,
|
|
numberOfChannels: 1,
|
|
createGraph: function(context) {
|
|
var sourceBuffer = context.createBuffer(1, 2048, context.sampleRate);
|
|
for (var i = 0; i < 2048; ++i) {
|
|
sourceBuffer.getChannelData(0)[i] = 1;
|
|
}
|
|
|
|
var source = context.createBufferSource();
|
|
source.buffer = sourceBuffer;
|
|
|
|
var gain = context.createGain();
|
|
gain.gain.setValueAtTime(V0, T0);
|
|
gain.gain.setTargetAtTime(V1, T0, TimeConstant);
|
|
|
|
source.connect(gain);
|
|
|
|
source.start(0);
|
|
return gain;
|
|
},
|
|
createExpectedBuffers: function(context) {
|
|
var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
|
|
for (var i = 0; i < 2048; ++i) {
|
|
var t = i / context.sampleRate;
|
|
expectedBuffer.getChannelData(0)[i] = V1 + (V0 - V1) * Math.exp(-(t - T0) / TimeConstant);
|
|
}
|
|
return expectedBuffer;
|
|
},
|
|
};
|
|
|
|
runTest();
|
|
|
|
</script>
|
|
</pre>
|
|
</body>
|
|
</html>
|