* commit '7e2561fa8313982aa21f7657953eedeeb33b210d':
lavfi: Use ff_get_video_buffer in all filters using hwframes
vf_hwupload_cuda: Fix build error
Merged-by: Matthieu Bouron <matthieu.bouron@gmail.com>
Implements support for height/width expressions in vf_scale_vaapi,
by refactoring common code into a new libavfilter/scale.c
Signed-off-by: Mark Thompson <sw@jkqxz.net>
Also adds a new flag to mark filters which are aware of hwframes and
will perform this task themselves, and marks all appropriate filters
with this flag.
This is required to allow software-mapped hardware frames to work,
because we need to have the frames context available for any later
mapping operation in the filter graph.
The output from the filter graph should only propagate further to an
encoder if the hardware format actually matches the visible format
(mapped frames are valid here and have an hw_frames_ctx, but this
should not be given to the encoder as its hardware context).
If the input has been decoded from a stream which uses edge cropping
then the whole surface need not be valid. This defines an input
region for the scaler so we only use the active area of the frame.
Matthieu Bouron
Clément Bœsch
Mark Thompson
Aman Gupta
Michael Niedermayer
Derek Buitenhuis