aa4c70e3da
Update the ffmpeg bindings and build script to use 5.0 and update our code to match the API changes since 4.4. BUG=None TEST=cargo test -p ffmpeg TEST=cargo test --features "video-decoder,ffmpeg" -p devices video TEST=v4l2r example from the crosvm book passses. Change-Id: If7820a4dd270d715e89c60d55f89b9730f40e864 Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3835501 Reviewed-by: Tatsuyuki Ishi <ishitatsuyuki@google.com> Tested-by: Alexandre Courbot <acourbot@chromium.org> Reviewed-by: Dennis Kempin <denniskempin@google.com> Commit-Queue: Alexandre Courbot <acourbot@chromium.org> Reviewed-by: Takaya Saeki <takayas@chromium.org> Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
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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 is released under a software license that makes our lawyers nervous. Also they all run bindgen at build time, which is not possible to do under the Chrome OS build system and would require to patch the crate with fully generated bindings.
So taking this in consideration, as well as the extra work that it is to depend on external Rust crates in Chrome OS, 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.
The bindings can be updated using the bindgen.sh script. 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.