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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/audit.js"></script>
<script src="../../resources/panner-model-testing.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
// 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.
audit.define(
{
label: 'test',
description: 'Equal-power panner model of AudioPannerNode',
},
(task, should) => {
// Create offline audio context.
context = new OfflineAudioContext(
2, sampleRate * renderLengthSeconds, sampleRate);
createTestAndRun(
context, should, nodesToCreate, 1,
function(panner, x, y, z) {
panner.setPosition(x, y, z);
})
.then(() => task.done());
;
});
// Test that a mono source plays out on both the left and right channels
// when the source and listener positions are the same.
audit.define(
{
label: 'mono source=listener',
description: 'Source and listener at the same position'
},
(task, should) => {
// Must be stereo to verify output and only need a short duration
let context =
new OfflineAudioContext(2, 0.25 * sampleRate, sampleRate);
// Arbitrary position for source and listener. Just so we don't use
// defaults positions.
let x = 1;
let y = 2;
let z = 3;
context.listener.setPosition(x, y, z);
let src = new OscillatorNode(context);
let panner = new PannerNode(context, {
panningModel: 'equalpower',
positionX: x,
positionY: y,
positionZ: z
});
src.connect(panner).connect(context.destination);
src.start();
context.startRendering()
.then(renderedBuffer => {
// Verify that both channels have the same data because they
// should when the source and listener are at the same
// position
let c0 = renderedBuffer.getChannelData(0);
let c1 = renderedBuffer.getChannelData(1);
should(c0, 'Mono: Left and right channels').beEqualToArray(c1);
})
.then(() => task.done());
});
// Test that a stereo source plays out on both the left and right channels
// when the source and listener positions are the same.
audit.define(
{
label: 'stereo source=listener',
description: 'Source and listener at the same position'
},
(task, should) => {
// Must be stereo to verify output and only need a short duration.
let context =
new OfflineAudioContext(2, 0.25 * sampleRate, sampleRate);
// Arbitrary position for source and listener. Just so we don't use
// defaults positions.
let x = 1;
let y = 2;
let z = 3;
context.listener.setPosition(x, y, z);
let src = new OscillatorNode(context);
let merger = new ChannelMergerNode(context, {numberOfInputs: 2});
let panner = new PannerNode(context, {
panningModel: 'equalpower',
positionX: x,
positionY: y,
positionZ: z
});
// Make the oscillator a stereo signal (with identical signals on
// each channel).
src.connect(merger, 0, 0);
src.connect(merger, 0, 1);
merger.connect(panner).connect(context.destination);
src.start();
context.startRendering()
.then(renderedBuffer => {
// Verify that both channels have the same data because they
// should when the source and listener are at the same
// position.
let c0 = renderedBuffer.getChannelData(0);
let c1 = renderedBuffer.getChannelData(1);
should(c0, 'Stereo: Left and right channels').beEqualToArray(c1);
})
.then(() => task.done());
});
audit.run();
</script>
</body>
</html>
|
