SmolRTSP is a C99 library implementing an RTSP 1.0 server stack with RTP media transport, designed for embedded devices like IP cameras. The code is the ground truth: it provides protocol parsing (request/response, SDP, RTCP), a pluggable transport layer (TCP interleaved, UDP), and codec-specific RTP packetizers for H.264, H.265, H.266 (VVC), AV1, JPEG XS, and JPEG. The architecture is layered: Writer → Transport → RtpTransport → codec packetizer, with Interface99-based vtables for extensibility. All dynamic memory during parsing is avoided (fixed-capacity header maps, zero-copy slices). The library is not a standalone executable; it is consumed by a separate event-loop integration (e.g., OpenIPC/smolrtsp-libevent). It includes a comprehensive test suite and example server demonstrating streaming of sample media files. While the code is functionally solid and well-tested for its domain, it relies heavily on macro metaprogramming (Datatype99, Metalang99, etc.) which can be a maintenance challenge and reduces debuggability. There are portability caveats (endianness, use of alloca in some paths) and security assumptions (weak SSRC randomness) documented in the code. Overall, it effectively solves the problem of RTSP/RTP serving on resource-constrained systems.