Arthur Edelstein
48b3c753da
* make sure audio farbling helper is always initialized before use * adjust for new passing result
51 lines
1.1 KiB
HTML
51 lines
1.1 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>Web Audio farbling test</title>
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</head>
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<body>
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<script type="module">
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// Testing code adapted from PoC in https://hackerone.com/reports/2846851
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const sumArray = (arr) => arr.reduce((sum, val) => sum + val, 0);
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async function analyzeAudio() {
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const context = new OfflineAudioContext(1, 44100, 44100);
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const osc = context.createOscillator();
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const gain = context.createGain();
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osc.type = 'sawtooth';
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osc.frequency.value = 440;
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gain.gain.value = 0.5;
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const analyser = context.createAnalyser();
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analyser.fftSize = 256;
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osc.connect(gain);
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gain.connect(analyser);
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analyser.connect(context.destination);
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osc.start();
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await context.startRendering();
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const floatFreq = new Float32Array(analyser.frequencyBinCount);
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analyser.getFloatFrequencyData(floatFreq);
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// Round off enough that we don't fail due to differences in arithmetic
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// implementation:
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return Math.round(sumArray(floatFreq) / 10);
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}
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async function runTest() {
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const result = await analyzeAudio();
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document.title = result;
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}
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await runTest();
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</script>
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</body>
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</html>
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