SystemsSWEFeb 2025 – Jun 2026
Audia & audia-tap
Co-Creator & Software Engineer
A macOS menu-bar app for real-time, per-app audio routing, plus an OSS CLI that pipes raw PCM straight into local AI models.
My contribution
Co-developed with Arjav Lamsal, with particular focus on real-time audio safety, crossfade behavior, per-app EQ state and blending, and release/distribution infrastructure.
- Crossfaded
- Device switching
- Dual taps ramp between output devices while the new pipeline warms up.Details
Inside Audia
How it works
Per-app audio
Spotify, Zoom, any process
Core Audio HAL tap
Process-level intercept, no driver
SPSC ring buffer
Lock-free sample transfer
SIMD DSP
10-band EQ, volume ramps
Routed output
Physical outputs, dual-tap crossfades
Highlights
- Co-built and shipped Audia, a macOS audio app with per-app volume control, device routing, equalization, and recording, then extracted its capture core into audia-tap, an OSS CLI for piping raw PCM audio directly into local AI models (Whisper, MLX).
- Co-developed driver-free routing with Core Audio process taps and private stacked aggregate devices bound to physical outputs. The system-audio capture permission path avoids exposing a public microphone device.
- Worked on real-time audio safety, SIMD-accelerated DSP (Apple Accelerate), 10-band EQ, and dual-tap device crossfades, keeping blocking work out of the render callback.
- Automated the end-to-end CI/CD release pipeline with GitHub Actions: signed DMG releases, Homebrew updates, and Sparkle OTA auto-updates. Also coordinated with a co-creator on the shared codebase via PR review for critical changes.
Stack
SwiftCore AudioHALC++SIMDShellGitHub Actions