DXVA_VideoTransferFunction - NtDoc
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// dxva.h
typedef enum _DXVA_VideoTransferFunction {
DXVA_VideoTransFuncShift,
DXVA_VideoTransFuncMask,
DXVA_VideoTransFunc_Unknown,
DXVA_VideoTransFunc_10,
DXVA_VideoTransFunc_18,
DXVA_VideoTransFunc_20,
DXVA_VideoTransFunc_22,
DXVA_VideoTransFunc_22_709,
DXVA_VideoTransFunc_22_240M,
DXVA_VideoTransFunc_22_8bit_sRGB,
DXVA_VideoTransFunc_28
} DXVA_VideoTransferFunction;
View the official Windows Driver Kit DDI referenceNo description available.
The DXVA_VideoTransferFunction enumeration type contains enumerators that identify the conversion function from R'G'B' to RGB.
DXVA_VideoTransFuncShiftSpecifies to shift bits by 27 positions (DXVA_ExtColorData_ShiftBase + 19, or 8 + 19).
DXVA_VideoTransFuncMaskSpecifies the video transfer function mask. 5 (0xF8000000) bits of a DWORD can be used to specify the video transfer function.
DXVA_VideoTransFunc_UnknownSpecifies that the video transfer function is not specified. The default is 22_8bit_sRGB if required for a computation.
DXVA_VideoTransFunc_10Specifies linear RGB conversion (corresponds to gamma = 1.0).
DXVA_VideoTransFunc_18Specifies true 1.8 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.
DXVA_VideoTransFunc_20Specifies true 2.0 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.
DXVA_VideoTransFunc_22DXVA_VideoTransFunc_22_709DXVA_VideoTransFunc_22_240MDXVA_VideoTransFunc_22_8bit_sRGBSpecifies gamma 2.4 curve with a linear range in the low range, which makes it match an accurate 2.2 gamma 8 bit curve.
DXVA_VideoTransFunc_28Specifies true 2.8 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.
One of the enumerators of DXVA_VideoTransferFunction can be specified in the VideoTransferFunction member of the DXVA_ExtendedFormat structure.
DXVA_VideoTransferFunction corresponds to the gamma function of the data. Some transfer functions have corrections to account for 8 bit integer quantization effects.