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