D3D12DDI_VIDEO_ENCODER_PICTURE_CONTROL_CODEC_DATA_H264_REFERENCE_PICTURE_LIST_MODIFICATION_OPERATION_0082_0 structure (d3d12umddi.h)

The D3D12DDI_VIDEO_ENCODER_PICTURE_CONTROL_CODEC_DATA_H264_REFERENCE_PICTURE_LIST_MODIFICATION_OPERATION_0082_0 structure represents a picture list modification operation for H.264 video encoding.

Syntax

typedef struct D3D12DDI_VIDEO_ENCODER_PICTURE_CONTROL_CODEC_DATA_H264_REFERENCE_PICTURE_LIST_MODIFICATION_OPERATION_0082_0 {
  UCHAR modification_of_pic_nums_idc;
  UINT  abs_diff_pic_num_minus1;
  UINT  long_term_pic_num;
} D3D12DDI_VIDEO_ENCODER_PICTURE_CONTROL_CODEC_DATA_H264_REFERENCE_PICTURE_LIST_MODIFICATION_OPERATION_0082_0;

Members

modification_of_pic_nums_idc

Together with abs_diff_pic_num_minus1 or long_term_pic_num, specifies which of the reference pictures are re-mapped. The values of modification_of_pic_nums_idc are specified in Table 7-7 of the H.264 specification. The first modification_of_pic_nums_idc that follows immediately after ref_pic_list_modification_flag_l0 or ref_pic_list_modification_flag_l1 shall not be equal to 3.

abs_diff_pic_num_minus1

Plus 1 specifies the absolute difference between the picture number of the picture being moved to the current index in the list and the picture number prediction value. abs_diff_pic_num_minus1 shall be in the range of 0 to MaxPicNum − 1. The allowed values of abs_diff_pic_num_minus1 are further restricted as specified in clause 8.2.4.3.1 of the H.264 specification.

long_term_pic_num

Specifies the long-term picture number of the picture being moved to the current index in the list. When decoding a coded frame, long_term_pic_num shall be equal to a LongTermPicNum assigned to one of the reference frames or complementary reference field pairs marked as "used for long-term reference". When decoding a coded field, long_term_pic_num shall be equal to a LongTermPicNum assigned to one of the reference fields marked as "used for long-term reference".

Remarks

For modification details, refer to the H.264 specification, section 7.4.3.1 "Reference picture list modification semantics".

See D3D12 video encoding for general information.

Requirements

See also

D3D12DDI_VIDEO_ENCODER_PICTURE_CONTROL_CODEC_DATA_H264_0082_0