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<!DOCTYPE html>
<html>
<head>
<title>
panner-equalpower.html
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../resources/audit-util.js"></script>
<script src="../../resources/panner-model-testing.js"></script>
</head>
<body>
<script>
// To test the panner, we create a number of panner nodes
// equally spaced on a semicircle at unit distance. The
// semicircle covers the azimuth range from -90 to 90 deg,
// covering full left to full right. Each source is an impulse
// turning at a different time and we check that the rendered
// impulse has the expected gain.
promise_test(async () => {
const context = new OfflineAudioContext(
2, sampleRate * renderLengthSeconds, sampleRate);
await createTestAndRun_W3CTH(
context, nodesToCreate, 1,
(panner, x, y, z) => panner.setPosition(x, y, z));
}, 'Equal-power panner model of AudioPannerNode');
// Test that a mono source plays out on both the left and right channels
// when the source and listener positions are the same.
promise_test(async () => {
const context =
new OfflineAudioContext(2, 0.25 * sampleRate, sampleRate);
// Arbitrary position for source and listener. Just so we don't use
// defaults positions.
const x = 1;
const y = 2;
const z = 3;
context.listener.setPosition(x, y, z);
const source = new OscillatorNode(context);
const panner = new PannerNode(context, {
panningModel: 'equalpower',
positionX: x,
positionY: y,
positionZ: z,
});
source.connect(panner).connect(context.destination);
source.start();
const renderedBuffer = await context.startRendering();
// The rendered left and right channels should be identical.
const left = renderedBuffer.getChannelData(0);
const right = renderedBuffer.getChannelData(1);
assert_array_equals(
left, right,
'Mono: left and right channels should contain identical samples.');
}, 'Mono source and listener at the same position');
// Test that a stereo source plays out on both the left and right channels
// when the source and listener positions are the same.
promise_test(async () => {
const context =
new OfflineAudioContext(2, 0.25 * sampleRate, sampleRate);
// Arbitrary position for source and listener. Just so we don't use
// defaults positions.
const x = 1;
const y = 2;
const z = 3;
context.listener.setPosition(x, y, z);
const source = new OscillatorNode(context);
const merger = new ChannelMergerNode(context, {numberOfInputs: 2});
const panner = new PannerNode(context, {
panningModel: 'equalpower',
positionX: x,
positionY: y,
positionZ: z,
});
// Make the oscillator a stereo signal (identical signals on each
// channel).
source.connect(merger, 0, 0);
source.connect(merger, 0, 1);
merger.connect(panner).connect(context.destination);
source.start();
const renderedBuffer = await context.startRendering();
// The rendered left and right channels should be identical.
const left = renderedBuffer.getChannelData(0);
const right = renderedBuffer.getChannelData(1);
assert_array_equals(
left, right,
'Stereo: left and right channels should contain identical ' +
'samples.');
}, 'Stereo source and listener at the same position');
</script>
</body>
</html>
|
