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DXVA_VideoTransferFunction enumeration (dxva.h)

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The DXVA_VideoTransferFunction enumeration type contains enumerators that identify the conversion function from R'G'B' to RGB.

Syntax

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;

Constants

 
DXVA_VideoTransFuncShift
Specifies to shift bits by 27 positions (DXVA_ExtColorData_ShiftBase + 19, or 8 + 19).
DXVA_VideoTransFuncMask
Specifies the video transfer function mask. 5 (0xF8000000) bits of a DWORD can be used to specify the video transfer function.
DXVA_VideoTransFunc_Unknown
Specifies that the video transfer function is not specified. The default is 22_8bit_sRGB if required for a computation.
DXVA_VideoTransFunc_10
Specifies linear RGB conversion (corresponds to gamma = 1.0).
DXVA_VideoTransFunc_18
Specifies true 1.8 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.
DXVA_VideoTransFunc_20
Specifies true 2.0 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.
DXVA_VideoTransFunc_22
DXVA_VideoTransFunc_22_709
DXVA_VideoTransFunc_22_240M
DXVA_VideoTransFunc_22_8bit_sRGB
Specifies 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_28
Specifies true 2.8 gamma. That is, L' = pow(L, 1/gamma) for L=0..1.

Remarks

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.

Requirements

Requirement Value
Minimum supported client This enumeration type applies only to Windows Server 2003 with SP1 and later, and Windows XP with SP2 and later.
Header dxva.h (include Dxva.h)

See also

DXVA_ExtendedFormat