DXVA_NominalRange - NtDoc
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// dxva.h
typedef enum _DXVA_NominalRange {
DXVA_NominalRangeShift,
DXVA_NominalRangeMask,
DXVA_NominalRange_Unknown,
DXVA_NominalRange_Normal,
DXVA_NominalRange_Wide,
DXVA_NominalRange_0_255,
DXVA_NominalRange_16_235,
DXVA_NominalRange_48_208
} DXVA_NominalRange;
View the official Windows Driver Kit DDI referenceNo description available.
The DXVA_NominalRange enumeration type contains enumerators that identify whether sample data includes headroom (values beyond 1.0 white) and toeroom (superblacks below the reference 0.0 black).
DXVA_NominalRangeShiftSpecifies to shift bits by 12 positions (DXVA_ExtColorData_ShiftBase + 4, or 8 + 4).
DXVA_NominalRangeMaskSpecifies the nominal range mask. 3 (0x00007000) bits of a DWORD can be used to specify nominal range.
DXVA_NominalRange_UnknownSpecifies that the nominal range is not specified.
DXVA_NominalRange_NormalSpecifies that normalized chroma [0..1] maps to [0..255] for 8-bit or [0..1023] for 10-bit.
DXVA_NominalRange_WideSpecifies that normalized chroma [0..1] maps to [16..235] for 8-bit or [64..940] for 10-bit.
DXVA_NominalRange_0_255Specifies that normalized chroma [0..1] maps to [0..255] for 8-bit or [0..1023] for 10-bit.
DXVA_NominalRange_16_235Specifies that normalized chroma [0..1] maps to [16..235] for 8-bit or [64..940] for 10-bit.
DXVA_NominalRange_48_208Specifies that normalized chroma [0..1] maps to [48..208] for 8-bit or [192..832] for 10-bit.
One of the enumerators of DXVA_NominalRange can be specified in the NominalRange member of the DXVA_ExtendedFormat structure.
Wide gamut R'G'B' (that is, blackpoint at 16,16,16 and whitepoint at 235,235,235) must be differentiated from normal sRGB.