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video-hdr: add HDR10+ structures

Stéphane Cerveau requested to merge dabrain34/gst-plugins-base:dab_h265parse_support_hdr10plus into master

This MR is releated to #700 (moved)

The current design relies on a structure to describe the Color Volume Transformation as defined in ST2094-40:2016 and a HDR10+/ST2094-40 structure which contains Color Volume Transformation by window.

The metadata will be exchanged through GstVideoMeta to make it dynamic and related to the following video buffers.

By example, when parsing h265 SEI message containing a ST2094-40 metadata, the metadata found will be parsed and attached to the current GstBuffer to be used downstream by the converter or the sink.

Edited by Stéphane Cerveau

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