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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test AudioParam with pre-gain </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">
+
+SimpleTest.waitForExplicitFinish();
+
+var ctx = new AudioContext();
+var source = ctx.createOscillator();
+var lfo = ctx.createOscillator();
+var lfoIntensity = ctx.createGain();
+var effect = ctx.createGain();
+var sp = ctx.createScriptProcessor(2048, 1);
+
+source.frequency.value = 440;
+lfo.frequency.value = 2;
+// Very low gain, so the LFO should have very little influence
+// on the source, its RMS value should be close to the nominal value
+// for a sine wave.
+lfoIntensity.gain.value = 0.0001;
+
+lfo.connect(lfoIntensity);
+lfoIntensity.connect(effect.gain);
+source.connect(effect);
+effect.connect(sp);
+
+sp.onaudioprocess = function(e) {
+ var buffer = e.inputBuffer.getChannelData(0);
+ var rms = 0;
+ for (var i = 0; i < buffer.length; i++) {
+ rms += buffer[i] * buffer[i];
+ }
+
+ rms /= buffer.length;
+ rms = Math.sqrt(rms);
+
+ // 1 / Math.sqrt(2) is the theoretical RMS value for a sine wave.
+ ok(fuzzyCompare(rms, 1 / Math.sqrt(2)),
+ "Gain correctly applied to the AudioParam.");
+
+ ctx = null;
+ sp.onaudioprocess = null;
+ lfo.stop(0);
+ source.stop(0);
+
+ SimpleTest.finish();
+}
+
+lfo.start(0);
+source.start(0);
+
+</script>
+</pre>
+</body>