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Tighten MPEG classification and reduce false positives

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Alex
2026-04-19 15:25:59 +03:00
parent 4210e5aa8b
commit 9de845cc1c
1 changed files with 6 additions and 2 deletions
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8
src/AudioAnalyzer.cpp
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@@ -529,9 +529,12 @@ AudioAnalysisReport AudioAnalyzer::analyzeFile(const QString &path) const {
const double genuineRatio = static_cast<double>(report.genuineWindows) / report.informativeWindows;
const bool hasStrongCdBoundary = report.cutoffKhz > 20.5 && report.rolloffKhz > 18.5 &&
report.spectralFlatness > 0.09 && report.suspectRatio <= 0.20;
report.spectralFlatness > 0.06 && report.suspectRatio <= 0.20;
const bool hasCdTopBand = report.veryHighBandRatio > 0.0000005 && report.spectralFlatness > 0.09;
const bool hasLossyFlatness = report.spectralFlatness < 0.075;
const bool hasLossyBoundary = report.cutoffKhz < 19.5 || report.rolloffKhz < 17.5;
const bool hasStrongLowpassSignature = hasLossyFlatness && hasLossyBoundary;
const bool hasSuspectEvidence = report.suspectWindows >= 2 && report.suspectRatio >= 0.45;
const bool hasAacLikeLowpass = report.veryHighBandRatio <= 0.0000005 && report.spectralFlatness < 0.19 &&
report.suspectRatio >= 0.55 && report.suspectWindows >= 2;
@@ -549,7 +552,8 @@ AudioAnalysisReport AudioAnalyzer::analyzeFile(const QString &path) const {
report.conclusion = QString("CDDA %1").arg(QString::number(confidence) + "%");
report.accuracy = QString::number(confidence) + "%";
report.confidence = confidence;
} else if (hasLossyFlatness || hasAacLikeLowpass || (report.suspectRatio >= 0.72 && report.suspectWindows >= 4)) {
} else if (hasAacLikeLowpass || hasStrongLowpassSignature ||
(hasSuspectEvidence && (hasLossyFlatness || hasLossyBoundary || report.suspectRatio >= 0.72))) {
const int confidence = std::clamp(static_cast<int>(std::round(55.0 + report.suspectRatio * 45.0)), 55, 100);
report.conclusion = QString("MPEG %1").arg(QString::number(confidence) + "%");
report.accuracy = QString::number(confidence) + "%";