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vapostproc: Process HDR caps fields

Víctor Manuel Jáquez Leal requested to merge vjaquez/gstreamer:va-postproc-hdr into main

This patch adds a new parameter: hdr-tone-mapping (same as vaapipostproc). If HDR filter available in driver the parameter is expose, but it's disabled by default.

If hdr-tone-mapping is enabled then HDR fields in sink caps are filtered in frames, from HDR to SDR, removing those hdr fields in source pad caps too.

hdr-tone-mapping is not enabled if a color conversion is also requested, since it fails to process in the iHD driver, so far.

Cc: @He_Junyan

Edited by Víctor Manuel Jáquez Leal

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