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video-converter: Add support for dynamic range conversion between SDR/PQ/HLG

Seungha Yang requested to merge seungha.yang/gstreamer:hdr-conversion into main

Initial support for SDR/HDR conversion. In this version, dynamic range conversion between SDR and HDR is implemented without HDR10 metadata, and sophisticated tone-mapping algorithm is not implemented.

  • SDR <-> HLG: Simplified and approximated dynamic range conversion method described in BT.2390-3-2017 is applied
  • PQ -> HLG: PQ signal will be down-converted to [0, 1000] cd/m^2 range and then HLG inverse EOTF is applied
  • HLG -> PQ: HLG EOTF and PQ inverse EOTF are applied

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