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<!DOCTYPE HTML>
<html>
<head>
<title>Test OscillatorNode type change after it has started and triangle phase</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">
SimpleTest.waitForExplicitFinish();
const bufferSize = 1024;
function startTest() {
var ctx = new AudioContext();
var oscillator1 = ctx.createOscillator();
oscillator1.connect(ctx.destination);
oscillator1.start(0);
// Assuming the above Web Audio operations have already scheduled an event
// to run in stable state and start the graph thread, schedule a subsequent
// event to change the type of oscillator1.
SimpleTest.executeSoon(function() {
oscillator1.type = "triangle";
// Another triangle wave with -1 gain should cancel the first. This is
// starting at the same time as the type change, assuming that the phase
// is reset on type change. A negative frequency should achieve the same
// as the -1 gain but for bug 916285.
var oscillator2 = ctx.createOscillator();
oscillator2.type = "triangle";
oscillator2.start(0);
var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
oscillator1.connect(processor);
var gain = ctx.createGain();
gain.gain.value = -1;
gain.connect(processor);
oscillator2.connect(gain);
processor.onaudioprocess = function(e) {
compareChannels(e.inputBuffer.getChannelData(0),
new Float32Array(bufferSize));
e.target.onaudioprocess = null;
SimpleTest.finish();
}
});
};
startTest();
</script>
</pre>
</body>
</html>
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