Add FLAC analysis scripts for click detection

- detect_clicks.sh: Batch analysis of all cached FLAC files
- analyze_flac.sh: Detailed analysis of a single FLAC file

These tools help verify audio quality and detect encoding issues
like clicks caused by buffer underruns.

analyze_flac.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Affiche toutes les stats d'un fichier FLAC
+
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <fichier.flac>"
+    exit 1
+fi
+
+FILE="$1"
+
+if [ ! -f "$FILE" ]; then
+    echo "Error: File not found: $FILE"
+    exit 1
+fi
+
+echo "=== Analyzing: $(basename "$FILE") ==="
+echo ""
+echo "--- SoX Statistics ---"
+sox "$FILE" -n stat 2>&1
+
+echo ""
+echo "--- File Info ---"
+file "$FILE"
+
+echo ""
+echo "--- FLAC Metadata ---"
+metaflac --list "$FILE" 2>/dev/null || echo "metaflac not installed"
+
+echo ""
+echo "--- Audio Integrity Check ---"
+flac -t "$FILE" 2>&1 || echo "flac not installed"

detect_clicks.sh

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+#!/bin/bash
+# Script pour détecter les clics dans les fichiers FLAC du cache
+
+CACHE_DIR="${1:-/tmp/pmomusic_test/audio_cache}"
+
+if [ ! -d "$CACHE_DIR" ]; then
+    echo "Error: Cache directory not found: $CACHE_DIR"
+    exit 1
+fi
+
+echo "=== FLAC Click Detection Tool ==="
+echo "Scanning: $CACHE_DIR"
+echo ""
+
+# Vérifier que sox est installé
+if ! command -v sox &> /dev/null; then
+    echo "Error: sox is not installed. Install it with: sudo apt install sox"
+    exit 1
+fi
+
+count=0
+suspicious=0
+
+for file in "$CACHE_DIR"/*.orig.flac; do
+    if [ ! -f "$file" ]; then
+        echo "No FLAC files found in $CACHE_DIR"
+        exit 0
+    fi
+
+    filename=$(basename "$file")
+    echo "Analyzing: $filename"
+
+    # Obtenir toutes les stats
+    stats=$(sox "$file" -n stat 2>&1)
+
+    # Extraire les valeurs importantes
+    pk_lev=$(echo "$stats" | grep "Pk lev dB" | awk '{print $4}')
+    rms_lev=$(echo "$stats" | grep "RMS lev dB" | awk '{print $4}')
+    crest=$(echo "$stats" | grep "Crest factor" | awk '{print $3}')
+
+    echo "  Peak level: ${pk_lev:-N/A} dB"
+    echo "  RMS level: ${rms_lev:-N/A} dB"
+    echo "  Crest factor: ${crest:-N/A} dB"
+
+    # Analyser la variance d'amplitude (détection de clics)
+    # On compte le nombre de pics au-dessus d'un seuil
+    peaks=$(sox "$file" -n stats 2>&1 | grep "Maximum amplitude" | awk '{print $3}')
+
+    if [ -n "$peaks" ]; then
+        # Si le peak est proche de 1.0 (clipping), c'est suspect
+        is_clipping=$(echo "$peaks > 0.95" | bc -l 2>/dev/null)
+        if [ "$is_clipping" = "1" ]; then
+            echo "  ⚠️  WARNING: Possible clipping detected!"
+            suspicious=$((suspicious + 1))
+        else
+            echo "  ✓  OK"
+        fi
+    else
+        echo "  ✓  OK"
+    fi
+
+    echo ""
+    count=$((count + 1))
+done
+
+echo "=== Summary ==="
+echo "Files scanned: $count"
+echo "Suspicious files: $suspicious"
+
+if [ $suspicious -gt 0 ]; then
+    echo ""
+    echo "⚠️  Some files may have issues. Listen to them carefully."
+    exit 1
+fi
+
+exit 0