Brian R. Bondy
720533d115
The test was checking document.title before the async WebAudio operations completed. Changed it to await the promise resolution instead of an immediate title check.
52 lines
1.1 KiB
HTML
52 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>
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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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return result;
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}
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window.webAudioAnalysisPromise = runTest();
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</script>
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</body>
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</html>
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