Audio Visualizer

Classic Windows Media Player–style circular visualizer in Rust. The bars react to system/playback audio and animate in real time.

Quick Start

cargo run --release

On macOS, the release build links to Swift (ScreenCaptureKit). If you see Library not loaded: libswift_Concurrency.dylib, run instead:

./run-release.sh

Or use a debug run (no Swift path needed): cargo run.

• Windows: Captures default playback device (system audio) via WASAPI loopback.
• macOS: Uses ScreenCaptureKit (SCK) for system audio. Requires Screen Recording permission—see macOS (ScreenCaptureKit) for details.
• Linux: Prefers monitor/loopback (system output) via PulseAudio/PipeWire when available; falls back to default input. Uses CPAL.

Controls

• SPACE – Toggle FPS display
• S – Rotate
• ↑/↓ – Speed
• A – Accel/Decel
• D – Distance/Time
• F11 – Fullscreen

Dependencies

• macroquad – 2D rendering
• rustfft – FFT
• cpal – Audio (Linux)
• wasapi – Windows loopback
• screencapturekit (macOS) – display + system audio capture

macOS (ScreenCaptureKit)

On macOS the app uses ScreenCaptureKit (SCK) to capture system audio. A minimal display stream (64×64) is created so SCK delivers audio; only the audio is used for the visualizer. No BlackHole or other third-party audio drivers.

Permissions: You must grant the following in System Settings → Privacy & Security when prompted (or before running):

• Screen Recording – Required for SCK to capture display and system audio. Enable for Terminal (or your IDE) if you run via cargo/./run-release.sh, or for the audio-visualizer binary if you run the built executable directly.

After granting access, the visualizer shows dancing bars that react to whatever is playing through the system output.