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<!DOCTYPE html>
<html>
<head>
<title>Test Panner Azimuth Calculation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/audit.js"></script>
</head>
<body>
<script>
const audit = Audit.createTaskRunner();
// Fairly arbitrary sample rate
const sampleRate = 16000;
audit.define('Azimuth calculation', (task, should) => {
// Two channels for the context so we can see each channel of the
// panner node.
let context = new OfflineAudioContext(2, sampleRate, sampleRate);
let src = new ConstantSourceNode(context);
let panner = new PannerNode(context);
src.connect(panner).connect(context.destination);
// The source is still pointed directly at the listener, but is now
// directly above. The audio should be the same in both the left and
// right channels.
panner.positionY.value = 1;
src.start();
context.startRendering()
.then(audioBuffer => {
// The left and right channels should contain the same signal.
let c0 = audioBuffer.getChannelData(0);
let c1 = audioBuffer.getChannelData(1);
let expected = Math.fround(Math.SQRT1_2);
should(c0, 'Left channel').beConstantValueOf(expected);
should(c1, 'Righteft channel').beConstantValueOf(expected);
})
.then(() => task.done());
});
audit.run();
</script>
</body>
</html>
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