this adds an IsVideoFrame trait that makes it easier to provide all the
shared methods between VideoFrame, VideoFrameRef, GLVideoFrame and
GLVideoFrameRef. Now only a single method, `as_non_null_ptr()` has to be
implemented and the rest of the shared methods will be provided by the
`VideoFrameExt` trait.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1312>
Currently only covers what is needed to keep code compiling, plus
everything caps/structure/tags related.
This avoids unnecessary heap allocations for adding the NUL-terminator
of C strings, and especially makes caps/structure handling as efficient
as in C.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1190>
These assertions can only trigger because of bugs in the bindings
implementation or in the C code and not because of bugs in calling code,
so using debug assertions is perfectly fine for them and reduces the
number of assertions inlined everywhere in release builds.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1188>
