43 lines
1.2 KiB
HTML
43 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Test AnalyserNode when the input is silent</title>
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<meta name="timeout" content="long">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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setup({ single_test: true });
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var ac = new AudioContext();
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var analyser = ac.createAnalyser();
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var constant = ac.createConstantSource();
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var sp = ac.createScriptProcessor(2048, 1, 1);
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constant.offset.value = 0.0;
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constant.connect(analyser).connect(ac.destination);
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constant.connect(sp).connect(ac.destination);
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var buf = new Float32Array(analyser.frequencyBinCount);
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var iteration_count = 10;
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sp.onaudioprocess = function() {
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analyser.getFloatFrequencyData(buf);
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var correct = true;
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for (var i = 0; i < buf.length; i++) {
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correct &= buf[i] == -Infinity;
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}
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assert_true(!!correct, "silent input process -Infinity in decibel bins");
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if (!iteration_count--) {
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sp.onaudioprocess = null;
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constant.stop();
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ac.close();
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done();
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}
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};
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constant.start();
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</script>
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</head>
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</body>
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</html>
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