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<head>
<title>Test StereoPannerNode</title>
<script type="text/javascript" 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" />
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<pre id="test">
<script class="testbody" type="text/javascript">
var SR = 44100;
var BUF_SIZE = 128;
var PANNING = 0.1;
var GAIN = 0.5;
// Cheap reimplementation of some bits of the spec
function gainForPanningMonoToStereo(panning) {
panning += 1;
panning /= 2;
return [ Math.cos(0.5 * Math.PI * panning),
Math.sin(0.5 * Math.PI * panning) ];
}
function gainForPanningStereoToStereo(panning) {
if (panning <= 0) {
panning += 1.;
}
return [ Math.cos(0.5 * Math.PI * panning),
Math.sin(0.5 * Math.PI * panning) ];
}
function applyStereoToStereoPanning(l, r, panningValues, panning) {
var outL, outR;
if (panning <= 0) {
outL = l + r * panningValues[0];
outR = r * panningValues[1];
} else {
outL = l * panningValues[0];
outR = r + l * panningValues[1];
}
return [outL,outR];
}
function applyMonoToStereoPanning(c, panning) {
return [c * panning[0], c * panning[1]];
}
// Test the DOM interface
var context = new OfflineAudioContext(1, 1, SR);
var stereoPanner = context.createStereoPanner();
ok(stereoPanner.pan, "The AudioParam member must exist");
is(stereoPanner.pan.value, 0.0, "Correct initial value");
is(stereoPanner.pan.defaultValue, 0.0, "Correct default value");
is(stereoPanner.channelCount, 2, "StereoPannerNode node has 2 input channels by default");
is(stereoPanner.channelCountMode, "clamped-max", "Correct channelCountMode for the StereoPannerNode");
is(stereoPanner.channelInterpretation, "speakers", "Correct channelCountInterpretation for the StereoPannerNode");
expectException(function() {
stereoPanner.channelCount = 3;
}, DOMException.NOT_SUPPORTED_ERR);
expectException(function() {
stereoPanner.channelCountMode = "max";
}, DOMException.NOT_SUPPORTED_ERR);
// A sine to be used to fill the buffers
function sine(t) {
return Math.sin(440 * 2 * Math.PI * t / context.sampleRate);
}
// A couple mono and stereo buffers: the StereoPannerNode equation is different
// if the input is mono or stereo
var stereoBuffer = context.createBuffer(2, BUF_SIZE, context.sampleRate);
var monoBuffer = context.createBuffer(1, BUF_SIZE, context.sampleRate);
for (var i = 0; i < BUF_SIZE; ++i) {
monoBuffer.getChannelData(0)[i] =
stereoBuffer.getChannelData(0)[i] =
stereoBuffer.getChannelData(1)[i] = sine(i);
}
// Expected test vectors
function expectedBufferNoop(gain) {
gain = gain || 1.0;
var expectedBuffer = context.createBuffer(2, BUF_SIZE, SR);
for (var i = 0; i < BUF_SIZE; i++) {
expectedBuffer.getChannelData(0)[i] = gain * sine(i);
expectedBuffer.getChannelData(1)[i] = gain * sine(i);
}
return expectedBuffer;
}
function expectedBufferForStereo(gain) {
gain = gain || 1.0;
var expectedBuffer = context.createBuffer(2, BUF_SIZE, SR);
var gainPanning = gainForPanningStereoToStereo(PANNING);
gainPanning[0] *= gain;
gainPanning[1] *= gain;
for (var i = 0; i < BUF_SIZE; i++) {
var values = [ sine(i), sine(i) ];
var processed = applyStereoToStereoPanning(values[0], values[1], gainPanning, PANNING);
expectedBuffer.getChannelData(0)[i] = processed[0];
expectedBuffer.getChannelData(1)[i] = processed[1];
}
return expectedBuffer;
}
function expectedBufferForMono(gain) {
gain = gain || 1.0;
var expectedBuffer = context.createBuffer(2, BUF_SIZE, SR);
var gainPanning = gainForPanningMonoToStereo(PANNING);
gainPanning[0] *= gain;
gainPanning[1] *= gain;
for (var i = 0; i < BUF_SIZE; i++) {
var value = sine(i);
var processed = applyMonoToStereoPanning(value, gainPanning);
expectedBuffer.getChannelData(0)[i] = processed[0];
expectedBuffer.getChannelData(1)[i] = processed[1];
}
return expectedBuffer;
}
// Actual test cases
var tests = [
function monoPanningNoop(ctx, panner) {
var monoSource = ctx.createBufferSource();
monoSource.connect(panner);
monoSource.buffer = monoBuffer;
monoSource.start(0);
return expectedBufferNoop();
},
function stereoPanningNoop(ctx, panner) {
var stereoSource = ctx.createBufferSource();
stereoSource.connect(panner);
stereoSource.buffer = stereoBuffer;
stereoSource.start(0);
return expectedBufferNoop();
},
function monoPanningNoopWithGain(ctx, panner) {
var monoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
monoSource.connect(gain);
gain.connect(panner);
monoSource.buffer = monoBuffer;
monoSource.start(0);
return expectedBufferNoop(GAIN);
},
function stereoPanningNoopWithGain(ctx, panner) {
var stereoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
stereoSource.connect(gain);
gain.connect(panner);
stereoSource.buffer = stereoBuffer;
stereoSource.start(0);
return expectedBufferNoop(GAIN);
},
function stereoPanningAutomation(ctx, panner) {
var stereoSource = ctx.createBufferSource();
stereoSource.connect(panner);
stereoSource.buffer = stereoBuffer;
panner.pan.setValueAtTime(0.1, 0.0);
stereoSource.start(0);
return expectedBufferForStereo();
},
function stereoPanning(ctx, panner) {
var stereoSource = ctx.createBufferSource();
stereoSource.buffer = stereoBuffer;
stereoSource.connect(panner);
panner.pan.value = 0.1;
stereoSource.start(0);
return expectedBufferForStereo();
},
function monoPanningAutomation(ctx, panner) {
var monoSource = ctx.createBufferSource();
monoSource.connect(panner);
monoSource.buffer = monoBuffer;
panner.pan.setValueAtTime(PANNING, 0.0);
monoSource.start(0);
return expectedBufferForMono();
},
function monoPanning(ctx, panner) {
var monoSource = ctx.createBufferSource();
monoSource.connect(panner);
monoSource.buffer = monoBuffer;
panner.pan.value = 0.1;
monoSource.start(0);
return expectedBufferForMono();
},
function monoPanningWithGain(ctx, panner) {
var monoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
monoSource.connect(gain);
gain.connect(panner);
monoSource.buffer = monoBuffer;
panner.pan.value = 0.1;
monoSource.start(0);
return expectedBufferForMono(GAIN);
},
function stereoPanningWithGain(ctx, panner) {
var stereoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
stereoSource.connect(gain);
gain.connect(panner);
stereoSource.buffer = stereoBuffer;
panner.pan.value = 0.1;
stereoSource.start(0);
return expectedBufferForStereo(GAIN);
},
function monoPanningWithGainAndAutomation(ctx, panner) {
var monoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
monoSource.connect(gain);
gain.connect(panner);
monoSource.buffer = monoBuffer;
panner.pan.setValueAtTime(PANNING, 0);
monoSource.start(0);
return expectedBufferForMono(GAIN);
},
function stereoPanningWithGainAndAutomation(ctx, panner) {
var stereoSource = ctx.createBufferSource();
var gain = ctx.createGain();
gain.gain.value = GAIN;
stereoSource.connect(gain);
gain.connect(panner);
stereoSource.buffer = stereoBuffer;
panner.pan.setValueAtTime(PANNING, 0);
stereoSource.start(0);
return expectedBufferForStereo(GAIN);
}
];
var finished = 0;
function finish() {
if (++finished == tests.length) {
SimpleTest.finish();
}
}
tests.forEach(function(f) {
var ac = new OfflineAudioContext(2, BUF_SIZE, SR);
var panner = ac.createStereoPanner();
panner.connect(ac.destination);
var expected = f(ac, panner);
ac.oncomplete = function(e) {
info(f.name);
compareBuffers(e.renderedBuffer, expected);
finish();
};
ac.startRendering()
});
SimpleTest.waitForExplicitFinish();
</script>
</pre>
<pre id=dump>
</pre>
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