Add support for audio CD ripping

[mapitman]

Overview

Add support for ripping audio CDs alongside existing DVD/Blu-ray/UHD disc support.

Audio Ripping Tools/Libraries

Command-Line Utilities

• abcde (A Better CD Encoder) - Popular all-in-one CD ripper/encoder
  • Supports multiple formats and backends
  • Scriptable and highly configurable
• cdparanoia - Robust CD ripper with error correction
  • Industry standard for audio extraction
  • Can be used as backend for other tools
• whipper - Modern CD ripper focusing on accuracy
  • Uses AccurateRip/MusicBrainz
  • Python-based, well-maintained
• morituri - Accurate CD ripper (predecessor to whipper)
• cd-discid - For disc identification

Libraries

• libcdio - CD access library (C)
• python-cdio - Python bindings for libcdio
• ruby-cdparanoia - Ruby bindings

Audio Format Support

The feature should support encoding to:

• MP3 (using lame or ffmpeg)
• FLAC (lossless, using flac encoder)
• AAC/M4A (using fdkaac or ffmpeg)
• Opus (modern, efficient)
• Vorbis/OGG (open format)
• WAV (uncompressed, for archival)

Metadata/Disc Identification APIs

• MusicBrainz API (recommended, free, open)
  • Disc ID lookup
  • Track metadata (artist, album, year, genre)
  • Cover art via Cover Art Archive
• CDDB/freedb (legacy, but still supported)
• AccurateRip (for verification of rip accuracy)
• Discogs API (alternative metadata source)

Implementation Considerations

Disc Detection Updates

The existing IDiscTypeDetector and DiscScanner will need to:

1. Detect if inserted disc is audio CD vs data disc (DVD/BD/UHD)
2. Return appropriate disc type enum value (add Audio type)
3. Route to appropriate ripping service based on disc type

Architecture Changes

• Create IAudioDiscRipper interface
• Implement AudioDiscRipper service
• Add IAudioEncoder for format conversion
• Create IAudioMetadataProvider for MusicBrainz/CDDB lookups
• Update RipOptions to support audio-specific options:
  • --format (mp3, flac, etc.)
  • --bitrate (for lossy formats)
  • --quality (compression level)
  • --paranoia-mode (error correction level)

File Naming

Audio files should follow standard naming conventions:

• Single disc: {Artist} - {Album} ({Year})/{TrackNumber:D2} - {Title}.{ext}
• Multi-disc: {Artist} - {Album} ({Year})/Disc {DiscNumber}/{TrackNumber:D2} - {Title}.{ext}

Metadata Embedding

• ID3v2 tags for MP3
• Vorbis comments for FLAC/Opus/OGG
• MP4 atoms for AAC/M4A
• Include: artist, album, title, track number, year, genre, cover art

User Experience

The tool should automatically:

1. Detect audio CD insertion
2. Query MusicBrainz for disc ID and metadata
3. Display track listing with artist/album info
4. Rip tracks with error correction
5. Encode to selected format(s)
6. Embed metadata and cover art
7. Organize files in output directory

Example Usage

# Rip to FLAC (lossless)
dotnet run -- --output ~/Music --format flac

# Rip to MP3 V0 (high quality VBR)
dotnet run -- --output ~/Music --format mp3 --quality v0

# Rip to multiple formats
dotnet run -- --output ~/Music --format flac,mp3 --bitrate 320

Related Issues

This feature complements existing video disc ripping functionality and uses similar architecture patterns.