Spektrum - Audio Visualizer

A real-time audio spectrum visualizer for Windows with a sleek, minimalist design. Displays audio frequencies as animated vertical bars that respond to system audio or microphone input.

Features

• Real-time Audio Visualization - 60 frequency bars dancing to your music
• Dual Input Modes
  • Speaker mode (system audio/loopback)
  • Microphone mode (live input)
• Ultra-low Latency - Instant response with high-priority audio capture
• Minimalist Design - Clean black and white aesthetic
• Smooth Animations - 60 FPS with fluid transitions
• Lightweight - Native Windows app, minimal resource usage
• No Dependencies - Single executable, no installation required

Controls

• 1 - Switch to Speaker mode (system audio)
• 2 - Switch to Microphone mode (microphone input)

Requirements

• Windows 7 or later
• Audio device (speakers/headphones for Speaker mode, microphone for Mic mode)
• No additional libraries or runtime dependencies

Building from Source

Prerequisites

• MinGW-w64 or MSVC compiler
• Windows SDK

Compile Instructions

# Compile resource file
windres icon.rc -o icon.o

# Compile and link
g++ main.cpp icon.o -o spektrum.exe -lole32 -mwindows -O2

Alternative with MSVC

rc icon.rc
cl main.cpp icon.res ole32.lib /Fe:spektrum.exe /link /SUBSYSTEM:WINDOWS

Technical Details

• Language: C++
• Framework: Win32 API
• Audio API: WASAPI (Windows Audio Session API)
• Rendering: GDI with double buffering
• Architecture: Multi-threaded (separate capture and render threads)

Performance Optimizations

• High-priority audio capture thread (THREAD_PRIORITY_TIME_CRITICAL)
• 100ms audio buffer for minimal latency
• Timer-based rendering to prevent freezing during window operations
• Smooth interpolation for fluid animations

Project Structure

Spektrum/
├── main.cpp          # Main application code
├── icon.rc           # Resource file (icon + version info)
├── icon.ico          # Application icon
├── .gitignore        # Git ignore rules
└── README.md         # This file

Customization

You can modify the following constants in main.cpp:

const int WINDOW_WIDTH = 1200;   // Window width
const int WINDOW_HEIGHT = 700;   // Window height
const int NUM_BARS = 60;         // Number of frequency bars

License

Copyright © 2026 Batuhan Eroğlu. All rights reserved.

Author

Batuhan Eroğlu

Acknowledgments

• Inspired by classic audio spectrum analyzers
• Built with Windows WASAPI for professional-grade audio capture
• Optimized for real-time performance and low latency

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