Bewerken

Delen via

DXVA_PicEntry_AV1 structure (dxva.h)

  • Artikel

The DXVA_PicEntry_AV1 structure specifies a reference to an uncompressed surface, with the additional metadata necessary for referencing that surface.

Syntax

typedef struct _DXVA_PicEntry_AV1 {
  UINT   width;
  UINT   height;
  INT    wmmat[6];
  union {
    struct {
      UCHAR wminvalid : 1;
      UCHAR wmtype : 2;
      UCHAR Reserved : 5;
    };
    UCHAR GlobalMotionFlags;
  } DUMMYUNIONNAME;
  UCHAR  Index;
  UINT16 Reserved16Bits;
} DXVA_PicEntry_AV1, *LPDXVA_PicEntry_AV1;

Members

width

Specifies the coded width of the referred frame. This field corresponds to the frame_width_minus_1 syntax element. See Remarks.

height

Specifies the coded height of the referred frame. This field corresponds to the frame_height_minus_1 syntax element. See Remarks.

wmmat[6]

The affine transformation matrix that applies globally to motion vectors referring to this frame.

DUMMYUNIONNAME

DUMMYUNIONNAME.wminvalid

Specifies whether the given global motion parameters are valid. If 0 then the parameters should be assumed to be invalid and not read.

DUMMYUNIONNAME.wmtype

Specifies the global motion type of this referred frame. This value matches the reference software’s TransformationType enum:

typedef enum {
  IDENTITY = 0,
  TRANSLATION = 1,
  ROTZOOM = 2,
  AFFINE = 3,
  TRANS_TYPES,
} TransformationType;

This attribute is informational, to help validate the contents of wmmat.

DUMMYUNIONNAME.Reserved

Reserved; do not use.

DUMMYUNIONNAME.GlobalMotionFlags

Global motion parameters.

Index

Identifies the index into ref_frame_map_texture_index[] to identify the frame used as a reference for this picture. When Index does not contain an index to a valid reference, the value shall be set to 255, to indicate that the index is invalid.

Reserved16Bits

Reserved; do not use.

Remarks

If width and height are derived for the frame (for example via the frame_size_override_flag), the host decoder will derive the appropriate values and store the result in these fields. Each AV1 frame may be coded at a different resolution than the previous frame(s).

See the Direct X Video Acceleration Specification for AV1 Video Coding for detailed information, including how to use this structure.

Requirements

Requirement Value
Minimum supported server Windows Server 2022
Header dxva.h