Modules
Everything related to libavcodec.
Everything related to libavfilter.
Everything related to libavformat.
Everything related to libavutil.
Errors of the rsmpeg.
Raw and unsafe FFmpeg functions, structs and contants,
Everything related to libswresample.
Everything related to libswscale.
Traits
This is a convenient trait we cannot find in the rust std library. Accessing
member of a ffi struct mutably is not always safe(consider directly changing
the capacity of a Vec). But for some members, accessing them is a need. So
UnsafeDerefMut is come to rescue. You can use foo.deref_mut().member = bar in a unsafe block if type of foo implements this trait.