# VkVideoEncodeH265NaluSliceSegmentInfoKHR(3) Manual Page

## Name

VkVideoEncodeH265NaluSliceSegmentInfoKHR - Structure specifies H.265 encode slice segment NALU parameters

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## C Specification

The VkVideoEncodeH265NaluSliceSegmentInfoKHR structure is defined as:

    // Provided by VK_KHR_video_encode_h265
    typedef struct VkVideoEncodeH265NaluSliceSegmentInfoKHR {
        VkStructureType                                sType;
        const void*                                    pNext;
        int32_t                                        constantQp;
        const StdVideoEncodeH265SliceSegmentHeader*    pStdSliceSegmentHeader;
    } VkVideoEncodeH265NaluSliceSegmentInfoKHR;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `constantQp` is the QP to use for the slice segment if the current rate control mode configured for the video session is `VK_VIDEO_ENCODE_RATE_CONTROL_MODE_DISABLED_BIT_KHR`.

- `pStdSliceSegmentHeader` is a pointer to a `StdVideoEncodeH265SliceSegmentHeader` structure specifying H.265 slice segment header parameters for the slice segment.

## Description

Std Slice Segment Header Parameters

  The members of the `StdVideoEncodeH265SliceSegmentHeader` structure pointed to by `pStdSliceSegmentHeader` are interpreted as follows:

  - `flags.reserved` and `reserved1` are used only for padding purposes and are otherwise ignored;

  - if `pWeightTable` is not `NULL`, then it is a pointer to a `StdVideoEncodeH265WeightTable` that is interpreted as follows:

    - `flags.luma_weight_l0_flag`, `flags.chroma_weight_l0_flag`, `flags.luma_weight_l1_flag`, and `flags.chroma_weight_l1_flag` are bitmasks where bit index i corresponds to `luma_weight_l0_flag[i]`, `chroma_weight_l0_flag[i]`, `luma_weight_l1_flag[i]`, and `chroma_weight_l1_flag[i]`, respectively, as defined in section 7.4.7.3 of the ITU-T H.265 Specification;

    - all other members of `StdVideoEncodeH265WeightTable` are interpreted as defined in section 7.4.7.3 of the ITU-T H.265 Specification;

  - all other members are interpreted as defined in section 7.4.7.1 of the ITU-T H.265 Specification.

Valid Usage (Implicit)

- VUID-VkVideoEncodeH265NaluSliceSegmentInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_NALU_SLICE_SEGMENT_INFO_KHR`

- VUID-VkVideoEncodeH265NaluSliceSegmentInfoKHR-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkVideoEncodeH265NaluSliceSegmentInfoKHR-pStdSliceSegmentHeader-parameter
  `pStdSliceSegmentHeader` must be a valid pointer to a valid `StdVideoEncodeH265SliceSegmentHeader` value

## See Also

VK_KHR_video_encode_h265, VkStructureType, VkVideoEncodeH265PictureInfoKHR

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0