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<!DOCTYPE HTML>
<html>
<head>
<title>Test PannerNode produces output even when the even when the distance is from the listener is zero</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">
const BUF_SIZE = 1024;
const sampleRate = 44100;
var types = [
"equalpower",
"HRTF"
]
async function testMono(panningModel) {
var ac = new OfflineAudioContext(2, BUF_SIZE, sampleRate);
// A sine to be used to fill the buffers
function sine(t) {
return Math.sin(440 * 2 * Math.PI * t / ac.sampleRate);
}
var monoBuffer = ac.createBuffer(1, BUF_SIZE, ac.sampleRate);
for (var i = 0; i < BUF_SIZE; ++i) {
monoBuffer.getChannelData(0)[i] = sine(i);
}
var monoSource = ac.createBufferSource();
monoSource.buffer = monoBuffer;
monoSource.start(0);
var panner = new PannerNode(ac, {
panningModel,
distanceModel: "linear",
});
monoSource.connect(panner);
var panner2 = new PannerNode(ac, {
panningModel,
distanceModel: "inverse",
});
panner.connect(panner2);
var panner3 = new PannerNode(ac, {
panningModel,
distanceModel: "exponential"
});
panner2.connect(panner3);
panner3.connect(ac.destination);
const buffer = await ac.startRendering();
if (panningModel == "equalpower") {
// Use the input buffer to compare the output. According to the spec,
// mono input at zero distance will apply gain = cos(0.5 * Math.PI / 2)
// https://webaudio.github.io/web-audio-api/#Spatialzation-equal-power-panning
const gain = Math.cos(0.5 * Math.PI / 2);
for (var i = 0; i < BUF_SIZE; ++i) {
monoBuffer.getChannelData(0)[i] = gain * monoBuffer.getChannelData(0)[i];
}
compareChannels(buffer.getChannelData(0), monoBuffer.getChannelData(0));
} else {
ok(!isChannelSilent(buffer.getChannelData(0)),
"mono panning: expect non-zero left channel");
}
// Check symmetry
compareChannels(buffer.getChannelData(0), buffer.getChannelData(1));
}
async function testStereo(panningModel) {
var ac = new OfflineAudioContext(2, BUF_SIZE, sampleRate);
// A sine to be used to fill the buffers
function sine(t) {
return Math.sin(440 * 2 * Math.PI * t / ac.sampleRate);
}
var stereoBuffer = ac.createBuffer(2, BUF_SIZE, ac.sampleRate);
for (var i = 0; i < BUF_SIZE; ++i) {
stereoBuffer.getChannelData(0)[i] = sine(i);
stereoBuffer.getChannelData(1)[i] = sine(i);
}
var stereoSource = ac.createBufferSource();
stereoSource.buffer = stereoBuffer;
stereoSource.start(0);
var panner = new PannerNode(ac, {
panningModel,
distanceModel: "linear",
});
stereoSource.connect(panner);
var panner2 = new PannerNode(ac, {
panningModel,
distanceModel: "inverse",
});
panner.connect(panner2);
var panner3 = new PannerNode(ac, {
panningModel,
distanceModel: "exponential",
});
panner2.connect(panner3);
panner3.connect(ac.destination);
const buffer = await ac.startRendering();
if (panningModel == "equalpower") {
compareBuffers(buffer, stereoBuffer);
} else {
ok(!isChannelSilent(buffer.getChannelData(0)),
"stereo panning: expect non-zero left channel");
// Check symmetry
compareChannels(buffer.getChannelData(0), buffer.getChannelData(1));
}
}
async function test(type) {
await promiseHRTFReady(sampleRate);
await testMono(type)
await testStereo(type);
}
add_task(async function() {
for (const panningModel of types) {
await test(panningModel);
}
});
</script>
</pre>
</body>
</html>
|
