# VkVideoDecodeH265DpbSlotInfoKHR(3) Manual Page

## Name

VkVideoDecodeH265DpbSlotInfoKHR - Structure specifies H.265 DPB information when decoding a frame

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## C Specification

The `VkVideoDecodeH265DpbSlotInfoKHR` structure is defined as:

    // Provided by VK_KHR_video_decode_h265
    typedef struct VkVideoDecodeH265DpbSlotInfoKHR {
        VkStructureType                           sType;
        const void*                               pNext;
        const StdVideoDecodeH265ReferenceInfo*    pStdReferenceInfo;
    } VkVideoDecodeH265DpbSlotInfoKHR;

## Members

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

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

- `pStdReferenceInfo` is a pointer to a `StdVideoDecodeH265ReferenceInfo` structure specifying reference picture information described in section 8.3 of the ITU-T H.265 Specification.

## Description

This structure is specified in the `pNext` chain of VkVideoDecodeInfoKHR::`pSetupReferenceSlot`, if not `NULL`, and the `pNext` chain of the elements of VkVideoDecodeInfoKHR::`pReferenceSlots` to specify the codec-specific reference picture information for an H.265 decode operation.

Active Reference Picture Information

  When this structure is specified in the `pNext` chain of the elements of VkVideoDecodeInfoKHR::`pReferenceSlots`, one element is added to the list of active reference pictures used by the video decode operation for each element of VkVideoDecodeInfoKHR::`pReferenceSlots` as follows:

  - The image subregion used is determined according to the H.265 Decode Picture Data Access section.

  - The reference picture is associated with the DPB slot index specified in the `slotIndex` member of the corresponding element of VkVideoDecodeInfoKHR::`pReferenceSlots`.

  - The reference picture is associated with the H.265 reference information provided in `pStdReferenceInfo`.

Reconstructed Picture Information

  When this structure is specified in the `pNext` chain of VkVideoDecodeInfoKHR::`pSetupReferenceSlot`, the information related to the reconstructed picture is defined as follows:

  - The image subregion used is determined according to the H.265 Decode Picture Data Access section.

  - If reference picture setup is requested, then the reconstructed picture is used to activate the DPB slot with the index specified in VkVideoDecodeInfoKHR::`pSetupReferenceSlot->slotIndex`.

  - The reconstructed picture is associated with the H.265 reference information provided in `pStdReferenceInfo`.

Std Reference Information

  The members of the `StdVideoDecodeH265ReferenceInfo` structure pointed to by `pStdReferenceInfo` are interpreted as follows:

  - `flags.used_for_long_term_reference` is used to indicate whether the picture is marked as “used for long-term reference” as defined in section 8.3.2 of the ITU-T H.265 Specification;

  - `flags.unused_for_reference` is used to indicate whether the picture is marked as “unused for reference” as defined in section 8.3.2 of the ITU-T H.265 Specification;

  - all other members are interpreted as defined in section 8.3 of the ITU-T H.265 Specification.

Valid Usage (Implicit)

- VUID-VkVideoDecodeH265DpbSlotInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_DECODE_H265_DPB_SLOT_INFO_KHR`

- VUID-VkVideoDecodeH265DpbSlotInfoKHR-pStdReferenceInfo-parameter
  `pStdReferenceInfo` must be a valid pointer to a valid `StdVideoDecodeH265ReferenceInfo` value

## See Also

VK_KHR_video_decode_h265, VkStructureType

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0