v2.8.0 - Auto-Extract Embedded Cover Art (2025-01-XX)

🎨 New Features

Auto-Extract Embedded Cover Art from Audio Files

Implements Issue #5: Audiobook Forge now automatically extracts embedded cover art from MP3/M4A files when no standalone cover file exists.

What's New:

• 🖼️ Automatic Fallback: If no cover.jpg or cover.png is found, the tool extracts cover art embedded in the first audio file
• 🎛️ Configurable: New metadata.auto_extract_cover config option (defaults to true)
• 📦 Format Support: Works with MP3 (ID3 APIC frames) and M4A/M4B (mp4ameta artwork)
• 🧹 Clean: Automatically cleans up temporary extracted covers after processing
• ✅ Smart Priority: Standalone cover files still take precedence (preserves existing behavior)

How It Works:

1. Scanner checks for standalone cover files (cover.jpg, folder.jpg, etc.)
2. If none found, extracts embedded cover from first MP3/M4A file
3. Uses extracted cover for final M4B metadata
4. Cleans up temporary .extracted_cover.jpg after processing

Configuration:

metadata:
  auto_extract_cover: true  # Default: enabled

Benefits:

• ✨ Audiobooks from Audible/iTunes with embedded covers "just work"
• 🚫 No need to manually extract and save cover.jpg
• 🔄 Fully backward compatible
• ⚙️ Can be disabled via config if needed

📝 Implementation Details

• Added 3 new cover extraction functions in src/audio/metadata.rs
• Updated Scanner to extract covers during directory scanning phase
• Uses existing id3 and mp4ameta dependencies
• Extracts to temporary file, cleaned after AtomicParsley embeds into M4B

🔗 Links

• Resolves: #5
• Commit: fae6e05

Full Changelog: v2.7.0...v2.8.0