# FFmpeg wrapper

This is a minimal FFmpeg 5.0+ wrapper for use with the virtio-video device, allowing to run a
virtual video device backed by software decoding or encoding. This is useful for development and
testing in situations where no supported video acceleration is available on the host.

Although several FFmpeg binding crates exist, most of them are not able to link against the system
FFmpeg, and [the only one that does](https://crates.io/crates/ffmpeg-sys) is released under a
software license that makes our lawyers nervous.

So taking this in consideration, as well as the extra work that it is to depend on external Rust
crates in ChromeOS, it is preferable to add our own simple bindings here that cover just the parts
of FFmpeg that we need.

This crate has minimal dependencies ; on the FFmpeg side, it just uses `libavcodec`, `libavutil` and
`libswscale`.

A few elements that bindgen cannot generate because they are behind C macros are re-defined in
`avutil.rs` and `error.rs`, as well as tests to ensure their correctness.

And that's about it.