MP3 Tag Reader & Editor is a command-line application developed in C that allows users to view and modify metadata stored inside MP3 files. The application works with ID3 tags and provides functionality to read and update information such as song title, artist name, album name, genre, year, and comments.

🎯 Built as a systems programming project to explore file handling, binary processing, and metadata manipulation in C.

• 🔍 View MP3 Metadata — Display all ID3 tag fields at a glance
• ✏️ Edit MP3 Metadata — Modify any tag field directly from the terminal
• 🎵 Read ID3 Tags — Parse and extract embedded song information
• 🏷️ Modify Song Title — Update the track name
• 👤 Modify Artist Name — Change the artist/performer field
• 💿 Modify Album Name — Edit the album title
• 📅 Modify Year — Update the release year
• 🎸 Modify Genre — Change the music genre
• 💬 Modify Comments — Add or edit inline comments
• ✅ MP3 File Validation — Ensure the file is a valid MP3 before processing
• 🖥️ Clean CLI Interface — Simple and intuitive command-line experience

mp3-tag-editor/
│
├── 📄 main.c         # Entry point; argument parsing and flow control
├── 📄 view.c         # Metadata display logic
├── 📄 view.h         # Header for view module
├── 📄 edit.c         # Tag editing and file write-back logic
├── 📄 help.c         # Help menu display
├── 📄 types.h        # Shared type definitions and structs
└── 📄 README.md      # Project documentation

Make sure you have GCC installed, then compile all source files with:

gcc *.c -o mp3_editor

./mp3_editor -v song.mp3

./mp3_editor -h

----------------------------------
  MP3 TAG READER AND EDITOR
----------------------------------
Title   : Example Song
Artist  : Example Artist
Album   : Example Album
Year    : 2025
Genre   : Pop
----------------------------------

File validation successful
Valid tag found
Tag updated successfully

1. 📂  Validate MP3 file format
        ↓
2. 🔍  Read ID3 metadata frames from binary
        ↓
3. 📤  Extract required tag information
        ↓
4. 🖥️  Display tag data to the user
        ↓
5. 🖊️  Modify selected tag (if -e flag used)
        ↓
6. 💾  Write updated metadata back to MP3 file

Through this project, hands-on experience was gained in:

• 📂 File Handling in C — Using fopen, fread, fwrite, fseek
• 🔢 Binary File Processing — Reading raw bytes and interpreting structured data
• 🏷️ Metadata Parsing — Understanding ID3v2 tag structure and frame layout
• 🔤 String Manipulation — Safe copying, formatting, and bounds checking
• 🖥️ Command Line Argument Processing — argc/argv parsing with getopt
• 🧩 Modular Programming — Splitting logic across .c/.h files
• 🐛 Debugging and Testing — Using gdb and systematic test cases

• 🆕 Support for ID3v2.4 tags
• 📦 Batch editing of multiple MP3 files at once
• 🎶 Playlist management support
• 🖼️ Album artwork extraction and embedding
• 🖱️ GUI version using GTK or Qt