SRS (Simple Realtime Server) is a high-performance, multi-protocol media streaming server primarily written in C++ with a newer Go-based proxy component (SRSX). It ingests, processes, and delivers live audio/video streams via RTMP, WebRTC (WHIP/WHEP), HLS, HTTP-FLV, SRT, and GB28181. The core C++ engine uses a coroutine model built on state-threads, implements stream forwarding, transcoding via FFmpeg, and provides a full HTTP API for management. The Go proxy component (cmd/proxy, internal/) adds load balancing, Redis integration, and protocol proxying for RTMP/HTTP/WebRTC, designed to scale origin/edge deployments. The repository also includes extensive research code, blackbox integration tests, and vendored third-party libraries (FFmpeg 4, OpenSSL 1.1, gperftools, SRT, libsrtp) that have been customized with a '-fit' suffix. This hybrid architecture is actively developed with multiple CI workflows and a large test suite, though some vendored dependencies are older and may require security updates.