$ show obsproject/obs-studio
OBS Studio is a cross-platform live streaming and recording application. Its architecture is modular: a core library (`libobs`) provides the runtime for sources, encoders, outputs, services, and filters, all registered via a plugin system. The frontend is a Qt-based desktop GUI (`frontend/`) that manages scenes, sources, audio mixing, and output controls. Graphics rendering is abstracted across Direct3D 11, Metal, and OpenGL backends. The system ingests video/audio from capture sources (screen, window, game, camera, hardware I/O like DeckLink), processes them through filters and encoders (x264, NVENC, QSV, AMF, FFmpeg), and outputs to streaming protocols (RTMP, WHIP, SRT) or local files (FLV, MP4, MOV). External dependencies include FFmpeg, Qt, libcurl, and various hardware SDKs. The codebase demonstrates strong engineering with reusable utility libraries (dynamic arrays, strings, config files, profilers) and a well-defined plugin API, though platform-specific code and bundled third-party SDKs introduce some technical drift.
The LLM identified 5 files worth highlighting for reuse:
A lightweight dynamic string implementation with inline functions for allocation, concatenation, formatting, and manipulation. It depends only on standard C headers and `bmem.h` (which provides aligned memory allocation). The design is clean and could be extracted into any C project needing a performant, mutable string type.
A header-only macro-based dynamic array implementation that generates type-safe arrays for any struct. It provides push, pop, insert, erase, resize, and sort operations. The macro pattern is non-obvious and demonstrates advanced C preprocessor usage. It is self-contained and reusable in any C project.
A generic data stack for passing named parameters between signal handlers and procedures. It supports integers, floats, strings, pointers, and blobs. The implementation uses a dynamic array and a hash table for name lookup. It is a reusable pattern for any event/callback system that needs flexible parameter passing.
A configuration file parser supporting sections, key-value pairs, and default values. It provides atomic write (temp file + rename) and type-safe getters/setters. The implementation is self-contained (depends only on `dstr` and platform file I/O) and could be reused in any C/C++ project needing a simple config file format.
A custom Qt flow layout that arranges child widgets in rows, wrapping to the next row when the horizontal space is exhausted. It reimplements `QLayout` virtual methods and handles size hints, minimum sizes, and height-for-width. This is a reusable Qt widget pattern for any application needing a wrapping layout.