TemperPlayer

Problem

I wanted signal analysis to be part of listening. That meant useful meters, a compact menu-bar player, and pitch control that preserved transients and stereo placement.

Approach

SwiftUI handles the application and AVFoundation handles playback. A small C ABI connects the app to Zig code for the decoding, analysis, and pitch-processing work where I wanted direct control.

What I built

I built the SwiftUI application, SQLite-backed library, queue and playlist flows, menu-bar player, waveform, spectrogram, and multiband goniometer. In Zig, I implemented FLAC and WAV decoding, mastering measurements, and an identity-phase-locked phase vocoder with transient resets and Kaiser-windowed sinc resampling.

Engineering focus

The engineering work includes the Swift and Zig C ABI, real-time analysis, bounded visual queues, sample-rate handling, track-switch lifecycle, stereo phase correlation, and native macOS packaging.

I'll finish hardening the current library and playback changes, test on more Macs and audio devices, and add formats after their playback paths are measured and reliable.