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Enable zero-copy support for gstreamer video decoders



Implements the interface to provide the VLC pictures

from vout mapped to GstBuffers, along with per video

plane stride/offsets info, to the upstream gstreamer

video decoder. If the stride/offsets info of the vlc

pictures (created by vout) matches the video decoder's

expectations, the decoder will directly decode into

the vout allocated pictures, enabling zero-copy. Else

it will continue to use it's own bufferpool



Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

