This Rust crate provides a tiny and very specific wrapper for the VP6 decoder in FFmpeg.
The primary purpose of it is to serve as an optional component of the Ruffle Flash Player emulator.
This wrapper can utilize FFmpeg in two ways.
At build time, pkg-config is used to look for suitable versions of
libavutil, libavcodec, and libswscale installed on the system.
If they are all found, the "Dynamically Linked" scenario takes effect,
otherwise, the "Statically Linked" one - if allowed.
Works only on desktop, and loads system libraries at runtime. Only builds a tiny piece of C code as glue.
The license can be MIT.
The built library is completely standalone, with the necessary source files compiled in.
It also includes a tiny stub in place of a real libc - just enough to make the decoder compile and work on wasm32-unknown-unknown (without Emscripten and the like).
It comes with its own hand-tailored config.h to reduce its reliance on any external functions as much as possible.
The license must be LGPL, so this case is only available if the allow-lgpl
feature is enabled.