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105 lines
3.1 KiB
HTML
105 lines
3.1 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test left/right symmetry and block-offset invariance of HRTF panner</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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const blockSize = 128;
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const bufferSize = 4096; // > HRTF panner latency
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var ctx = new AudioContext();
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function isChannelSilent(channel) {
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for (var i = 0; i < channel.length; ++i) {
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if (channel[i] != 0.0) {
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return false;
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}
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}
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return true;
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}
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function startTest() {
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var leftPanner = ctx.createPanner();
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var rightPanner = ctx.createPanner();
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leftPanner.setPosition(-1,0,0);
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rightPanner.setPosition(1,0,0);
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// Test that PannerNode processes the signal consistently irrespective of
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// the offset in the processing block. This is done by inserting a delay of
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// less than a block size before one panner.
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const delayTime = 0.7 * blockSize / ctx.sampleRate;
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var leftDelay = ctx.createDelay(delayTime);
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leftDelay.delayTime.value = delayTime;
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leftDelay.connect(leftPanner);
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// and compensating for the delay after the other.
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var rightDelay = ctx.createDelay(delayTime);
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rightDelay.delayTime.value = delayTime;
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rightPanner.connect(rightDelay);
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// Feed the panners with a signal having some harmonics to fill the spectrum.
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var oscillator = ctx.createOscillator();
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oscillator.frequency.value = 110;
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oscillator.type = "sawtooth";
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oscillator.connect(leftDelay);
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oscillator.connect(rightPanner);
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oscillator.start(0);
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// Switch the channels on one panner output, and it should match the other.
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var splitter = ctx.createChannelSplitter();
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leftPanner.connect(splitter);
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var merger = ctx.createChannelMerger();
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splitter.connect(merger, 0, 1);
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splitter.connect(merger, 1, 0);
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// Invert one signal so that mixing with the other will find the difference.
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var gain = ctx.createGain();
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gain.gain.value = -1.0;
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merger.connect(gain);
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var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
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gain.connect(processor);
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rightDelay.connect(processor);
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processor.onaudioprocess =
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function(e) {
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compareBuffers(e.inputBuffer,
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ctx.createBuffer(2, bufferSize, ctx.sampleRate));
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e.target.onaudioprocess = null;
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SimpleTest.finish();
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}
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}
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function prepareTest() {
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// A PannerNode will produce no output until it has loaded its HRIR
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// database. Wait for this to load before starting the test.
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var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
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var panner = ctx.createPanner();
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panner.connect(processor);
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var oscillator = ctx.createOscillator();
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oscillator.connect(panner);
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oscillator.start(0);
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processor.onaudioprocess =
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function(e) {
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if (isChannelSilent(e.inputBuffer.getChannelData(0)))
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return;
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oscillator.stop(0);
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panner.disconnect();
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e.target.onaudioprocess = null;
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startTest();
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};
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}
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prepareTest();
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</script>
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</pre>
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</body>
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</html>
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