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fix dashes
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1 changed files with 31 additions and 31 deletions
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index.html
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index.html
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@ -3,7 +3,7 @@
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>tcd — Audio Transcode Detector</title>
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<title>tcd - Audio Transcode Detector</title>
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<link rel="stylesheet" href="style.css">
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</head>
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<body>
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@ -44,11 +44,11 @@
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<div class="metrics-grid" style="margin-top:10px">
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<div class="metric-card">
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<div class="metric-label">Live Peak</div>
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<div class="metric-value" id="livePeak">—</div>
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<div class="metric-value" id="livePeak">-</div>
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</div>
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<div class="metric-card">
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<div class="metric-label">Live Cutoff</div>
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<div class="metric-value" id="liveCutoff">—</div>
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<div class="metric-value" id="liveCutoff">-</div>
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</div>
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</div>
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</section>
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@ -56,14 +56,14 @@
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<section id="fileInfo">
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<h2>File Information</h2>
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<div class="info-grid">
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<div class="info-item fullwidth"><span class="info-label">Filename</span><span id="fileName" class="info-value">—</span></div>
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<div class="info-item"><span class="info-label">Format</span><span id="fileFormat" class="info-value">—</span></div>
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<div class="info-item"><span class="info-label">Sample Rate</span><span id="fileSampleRate" class="info-value">—</span></div>
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<div class="info-item"><span class="info-label">Channels</span><span class="info-value"><span id="fileChannels">—</span> <span id="fileStereoMode" class="info-value-tag"></span></span></div>
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<div class="info-item"><span class="info-label">Duration</span><span id="fileDuration" class="info-value">—</span></div>
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<div class="info-item"><span class="info-label">Bitrate</span><span class="info-value"><span id="fileBitrate">—</span> <span id="fileBitrateMode" class="info-value-tag"></span></span></div>
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<div class="info-item"><span class="info-label">File Size</span><span id="fileSize" class="info-value">—</span></div>
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<div class="info-item"><span class="info-label">BPM</span><span class="info-value bpm-value"><span id="fileBPM">—</span><span class="bpm-buttons"><button class="bpm-btn" id="bpmHalf" title="Halve">÷2</button><button class="bpm-btn" id="bpmDouble" title="Double">×2</button></span></span></div>
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<div class="info-item fullwidth"><span class="info-label">Filename</span><span id="fileName" class="info-value">-</span></div>
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<div class="info-item"><span class="info-label">Format</span><span id="fileFormat" class="info-value">-</span></div>
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<div class="info-item"><span class="info-label">Sample Rate</span><span id="fileSampleRate" class="info-value">-</span></div>
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<div class="info-item"><span class="info-label">Channels</span><span class="info-value"><span id="fileChannels">-</span> <span id="fileStereoMode" class="info-value-tag"></span></span></div>
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<div class="info-item"><span class="info-label">Duration</span><span id="fileDuration" class="info-value">-</span></div>
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<div class="info-item"><span class="info-label">Bitrate</span><span class="info-value"><span id="fileBitrate">-</span> <span id="fileBitrateMode" class="info-value-tag"></span></span></div>
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<div class="info-item"><span class="info-label">File Size</span><span id="fileSize" class="info-value">-</span></div>
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<div class="info-item"><span class="info-label">BPM</span><span class="info-value bpm-value"><span id="fileBPM">-</span><span class="bpm-buttons"><button class="bpm-btn" id="bpmHalf" title="Halve">÷2</button><button class="bpm-btn" id="bpmDouble" title="Double">×2</button></span></span></div>
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</div>
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</section>
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@ -83,50 +83,50 @@
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<section id="metricsSection">
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<h2>Key Metrics</h2>
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<div class="metrics-grid">
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<div class="metric-card" title="Peak Magnitude — highest spectral amplitude in dBFS (0 dBFS = full scale). How to read: • > -1 dBFS: Heavily limited/mastered, extremely loud • -6 to -1 dBFS: Typical modern mastering • -12 to -6 dBFS: Conservative, good headroom • < -12 dBFS: Quiet or attenuated Significance: Combined with noise floor, indicates the effective dynamic range of the audio.">
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<div class="metric-card" title="Peak Magnitude - highest spectral amplitude in dBFS (0 dBFS = full scale). How to read: • > -1 dBFS: Heavily limited/mastered, extremely loud • -6 to -1 dBFS: Typical modern mastering • -12 to -6 dBFS: Conservative, good headroom • < -12 dBFS: Quiet or attenuated Significance: Combined with noise floor, indicates the effective dynamic range of the audio.">
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<div class="metric-label">Peak</div>
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<div class="metric-value" id="mPeak">—</div>
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<div class="metric-value" id="mPeak">-</div>
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</div>
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<div class="metric-card" title="Spectral Cutoff — highest frequency bin with significant energy above floor, as Hz and % of Nyquist (sample rate / 2). How to read: • ≥ 20 kHz (≥ 90%): Full bandwidth — lossless or high-bitrate lossy (320k MP3, 256k AAC) • 16-19 kHz (70-85%): ~192k MP3 / ~128k AAC • 14-16 kHz (60-70%): ~128k MP3 • 10-14 kHz (45-60%): ~64-96k lossy • < 10 kHz (< 45%): Very low bitrate (< 64k) Significance: The single strongest indicator of lossy compression. Lower cutoff = more aggressive compression.">
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<div class="metric-card" title="Spectral Cutoff - highest frequency bin with significant energy above floor, as Hz and % of Nyquist (sample rate / 2). How to read: • ≥ 20 kHz (≥ 90%): Full bandwidth - lossless or high-bitrate lossy (320k MP3, 256k AAC) • 16-19 kHz (70-85%): ~192k MP3 / ~128k AAC • 14-16 kHz (60-70%): ~128k MP3 • 10-14 kHz (45-60%): ~64-96k lossy • < 10 kHz (< 45%): Very low bitrate (< 64k) Significance: The single strongest indicator of lossy compression. Lower cutoff = more aggressive compression.">
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<div class="metric-label">Cutoff</div>
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<div class="metric-value" id="mCutoff">—</div>
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<div class="metric-value" id="mCutoff">-</div>
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</div>
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<div class="metric-card" title="Transition Bandwidth (Steepness) — frequency gap between the -20 dBFS and -60 dBFS points. Measures how abruptly high-frequencies drop off. How to read: • < 500 Hz: Brick-wall cutoff — transcode or low-bitrate lossy • 500-1500 Hz: Moderately sharp — suspicious, may be higher-bitrate lossy • 1500-3000 Hz: Gradual rolloff — typical of genuine lossless • > 3000 Hz: Very gradual — natural rolloff from analog sources Significance: The strongest differentiator between genuine lossless and transcodes. Lossy encoders produce artificially steep lowpass filters.">
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<div class="metric-card" title="Transition Bandwidth (Steepness) - frequency gap between the -20 dBFS and -60 dBFS points. Measures how abruptly high-frequencies drop off. How to read: • < 500 Hz: Brick-wall cutoff - transcode or low-bitrate lossy • 500-1500 Hz: Moderately sharp - suspicious, may be higher-bitrate lossy • 1500-3000 Hz: Gradual rolloff - typical of genuine lossless • > 3000 Hz: Very gradual - natural rolloff from analog sources Significance: The strongest differentiator between genuine lossless and transcodes. Lossy encoders produce artificially steep lowpass filters.">
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<div class="metric-label">Steepness</div>
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<div class="metric-value" id="mSteepness">—</div>
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<div class="metric-value" id="mSteepness">-</div>
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</div>
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<div class="metric-card" title="Noise Floor — average magnitude in the top quarter of the spectrum (> 3/4 Nyquist), in dB relative to peak. How to read: • < -90 dB: Excellent — extremely clean, high dynamic range • -80 to -90 dB: Very good — typical of quality lossless • -70 to -80 dB: Moderate — some quantization noise present • -60 to -70 dB: Elevated — suggests lossy compression or analog hiss • > -60 dB: High — almost certainly lossy compressed Significance: Lossy codecs raise the noise floor through quantization. High noise floor + sharp cutoff = strong transcode indicator.">
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<div class="metric-card" title="Noise Floor - average magnitude in the top quarter of the spectrum (> 3/4 Nyquist), in dB relative to peak. How to read: • < -90 dB: Excellent - extremely clean, high dynamic range • -80 to -90 dB: Very good - typical of quality lossless • -70 to -80 dB: Moderate - some quantization noise present • -60 to -70 dB: Elevated - suggests lossy compression or analog hiss • > -60 dB: High - almost certainly lossy compressed Significance: Lossy codecs raise the noise floor through quantization. High noise floor + sharp cutoff = strong transcode indicator.">
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<div class="metric-label">Noise Floor</div>
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<div class="metric-value" id="mNoise">—</div>
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<div class="metric-value" id="mNoise">-</div>
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</div>
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<div class="metric-card" title="Spectral Roughness (CoV) — coefficient of variation (σ/μ) of spectral magnitudes in the 60-95% region below cutoff. Measures how uneven/scalloped the spectrum is. How to read: • > 0.40: Strong spectral scalloping — clear lossy encoding signature • 0.30-0.40: Moderate scalloping — suspicious, may be high-bitrate lossy • 0.15-0.30: Mild unevenness — needs band-ratio correlation • < 0.15: Smooth spectrum — typical of genuine lossless Significance: Lossy codecs create a comb-filter pattern via frequency-bin quantization. High roughness = high probability of lossy encoding.">
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<div class="metric-card" title="Spectral Roughness (CoV) - coefficient of variation (σ/μ) of spectral magnitudes in the 60-95% region below cutoff. Measures how uneven/scalloped the spectrum is. How to read: • > 0.40: Strong spectral scalloping - clear lossy encoding signature • 0.30-0.40: Moderate scalloping - suspicious, may be high-bitrate lossy • 0.15-0.30: Mild unevenness - needs band-ratio correlation • < 0.15: Smooth spectrum - typical of genuine lossless Significance: Lossy codecs create a comb-filter pattern via frequency-bin quantization. High roughness = high probability of lossy encoding.">
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<div class="metric-label">Roughness</div>
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<div class="metric-value" id="mRoughness">—</div>
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<div class="metric-value" id="mRoughness">-</div>
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</div>
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<div class="metric-card" title="Band Ratio — ratio of average spectral energy in 16-20 kHz band to 12-16 kHz band. Detects unnatural high-frequency tilt. How to read: • < 0.5: Normal natural rolloff in top octave • 0.5-0.9: Typical for most recordings • 0.9-1.0: Flat HF — possible spectral reshaping from lossy encoding • > 1.0: Inverted tilt (more energy at 16-20 kHz than below) — strong transcode signature Significance: Used as secondary criterion when cutoff is high but roughness is ambiguous. Transcodes often show unnatural energy distribution in the top octaves.">
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<div class="metric-card" title="Band Ratio - ratio of average spectral energy in 16-20 kHz band to 12-16 kHz band. Detects unnatural high-frequency tilt. How to read: • < 0.5: Normal natural rolloff in top octave • 0.5-0.9: Typical for most recordings • 0.9-1.0: Flat HF - possible spectral reshaping from lossy encoding • > 1.0: Inverted tilt (more energy at 16-20 kHz than below) - strong transcode signature Significance: Used as secondary criterion when cutoff is high but roughness is ambiguous. Transcodes often show unnatural energy distribution in the top octaves.">
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<div class="metric-label">Band Ratio</div>
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<div class="metric-value" id="mBandRatio">—</div>
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<div class="metric-value" id="mBandRatio">-</div>
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</div>
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</div>
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<div class="analysis-info">
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<span><strong>Windows:</strong> <span id="windowsCount">—</span></span>
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<span><strong>FFT:</strong> <span id="fftSize">—</span></span>
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<span><strong>Windows:</strong> <span id="windowsCount">-</span></span>
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<span><strong>FFT:</strong> <span id="fftSize">-</span></span>
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</div>
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</section>
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<section id="decisionSection" title="Verdict — the overall classification of the audio file based on spectral analysis. NATIVE: File matches its declared lossy format at a consistent bitrate (single encode). UPSCALED: Lossy file re-encoded to a higher bitrate than the original source. GENUINE: File appears to be native lossless (no transcode artifacts detected). TRANSCODE: Lossy source re-encoded to a lossless format (e.g. 128k MP3 → FLAC). The verdict is decided by: cutoff ratio, transition bandwidth (steepness), roughness (CoV), and band-ratio analysis against adaptive thresholds.">
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<section id="decisionSection" title="Verdict - the overall classification of the audio file based on spectral analysis. NATIVE: File matches its declared lossy format at a consistent bitrate (single encode). UPSCALED: Lossy file re-encoded to a higher bitrate than the original source. GENUINE: File appears to be native lossless (no transcode artifacts detected). TRANSCODE: Lossy source re-encoded to a lossless format (e.g. 128k MP3 → FLAC). The verdict is decided by: cutoff ratio, transition bandwidth (steepness), roughness (CoV), and band-ratio analysis against adaptive thresholds.">
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<h2>Decision</h2>
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<div id="decision" class="decision-text">—</div>
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<div class="confidence-container" title="Validity Confidence — how strongly the evidence supports the verdict, from 0% (random chance) to 100% (certain). 85-100%: Very strong evidence — multiple criteria agree decisively. 70-84%: Strong evidence — most criteria support the verdict. 50-69%: Moderate evidence — some criteria triggered but not all. 30-49%: Weak evidence — marginal, borderline detection. 0-29%: Inconclusive — possible false positive, or audio is ambiguous. For lossy files: confidence is based on how far below the expected cutoff ratio the file sits. For lossless candidates: confidence blends cutoff ratio margin, steepness margin, and (above 80% Nyquist) secondary roughness + band-ratio criteria.">
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<div id="decision" class="decision-text">-</div>
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<div class="confidence-container" title="Validity Confidence - how strongly the evidence supports the verdict, from 0% (random chance) to 100% (certain). 85-100%: Very strong evidence - multiple criteria agree decisively. 70-84%: Strong evidence - most criteria support the verdict. 50-69%: Moderate evidence - some criteria triggered but not all. 30-49%: Weak evidence - marginal, borderline detection. 0-29%: Inconclusive - possible false positive, or audio is ambiguous. For lossy files: confidence is based on how far below the expected cutoff ratio the file sits. For lossless candidates: confidence blends cutoff ratio margin, steepness margin, and (above 80% Nyquist) secondary roughness + band-ratio criteria.">
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<div class="confidence-label">Validity Confidence</div>
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<div class="confidence-bar-bg">
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<div id="confidenceBar" class="confidence-bar-fill" style="width:0%">0%</div>
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</div>
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<div id="confidenceLabel" class="confidence-label-small">—</div>
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<div id="confidenceLabel" class="confidence-label-small">-</div>
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</div>
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</section>
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<section id="factors" title="Factor Analysis — step-by-step breakdown of the detection criteria used to reach the verdict. ① PRIMARY criteria (applied to ALL files): Compares transition bandwidth (steepness) to an adaptive threshold based on cutoff ratio. If steepness is BELOW the threshold, the spectrum has an artificially sharp cutoff → transcode flagged. Files with cutoff_ratio ≥ 0.99 (full spectrum) bypass this check. ② SECONDARY criteria (applied when cutoff_ratio > 0.80): Checks spectral roughness (CoV) and band ratio for additional transcode signatures. High roughness (> 0.40) alone is sufficient to confirm. Moderate roughness needs band-ratio corroboration. Lossy files: checked only for cutoff ratio vs expected range for the bitrate. ✓ = criterion met (supports transcode/upscaled), ✗ = criterion not met (supports genuine/native).">
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<section id="factors" title="Factor Analysis - step-by-step breakdown of the detection criteria used to reach the verdict. ① PRIMARY criteria (applied to ALL files): Compares transition bandwidth (steepness) to an adaptive threshold based on cutoff ratio. If steepness is BELOW the threshold, the spectrum has an artificially sharp cutoff → transcode flagged. Files with cutoff_ratio ≥ 0.99 (full spectrum) bypass this check. ② SECONDARY criteria (applied when cutoff_ratio > 0.80): Checks spectral roughness (CoV) and band ratio for additional transcode signatures. High roughness (> 0.40) alone is sufficient to confirm. Moderate roughness needs band-ratio corroboration. Lossy files: checked only for cutoff ratio vs expected range for the bitrate. ✓ = criterion met (supports transcode/upscaled), ✗ = criterion not met (supports genuine/native).">
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<section id="dataSection">
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<h2>Analysis Data</h2>
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</div>
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<footer>
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<p>Based on <a href="https://codeberg.org/armin/tcd" target="_blank">tcd</a> — Psychoacoustic audio authenticity analysis</p>
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<p>Based on <a href="https://codeberg.org/armin/tcd" target="_blank">tcd</a> - Psychoacoustic audio authenticity analysis</p>
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</footer>
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</div>
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