# VkVideoEncodeAV1DpbSlotInfoKHR(3) Manual Page

## Name

VkVideoEncodeAV1DpbSlotInfoKHR - Structure specifies AV1 encode DPB picture information

Loading… please wait.

## C Specification

The VkVideoEncodeAV1DpbSlotInfoKHR structure is defined as:

    // Provided by VK_KHR_video_encode_av1
    typedef struct VkVideoEncodeAV1DpbSlotInfoKHR {
        VkStructureType                          sType;
        const void*                              pNext;
        const StdVideoEncodeAV1ReferenceInfo*    pStdReferenceInfo;
    } VkVideoEncodeAV1DpbSlotInfoKHR;

## 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 `StdVideoEncodeAV1ReferenceInfo` structure specifying AV1 reference information.

## Description

This structure is specified in the `pNext` chain of VkVideoEncodeInfoKHR::`pSetupReferenceSlot`, if not `NULL`, and the `pNext` chain of the elements of VkVideoEncodeInfoKHR::`pReferenceSlots` to specify the codec-specific reference picture information for an AV1 encode operation.

Active Reference Picture Information

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

  - The image subregion used is determined according to the AV1 Encode Picture Data Access section.

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

  - The reference picture is associated with the AV1 reference information provided in `pStdReferenceInfo`.

Reconstructed Picture Information

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

  - The image subregion used is determined according to the AV1 Encode 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 VkVideoEncodeInfoKHR::`pSetupReferenceSlot->slotIndex`.

  - The reconstructed picture is associated with the AV1 reference information provided in `pStdReferenceInfo`.

Std Reference Information

  The members of the `StdVideoEncodeAV1ReferenceInfo` structure pointed to by `pStdReferenceInfo` are interpreted as follows:

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

  - `flags.disable_frame_end_update_cdf` is interpreted as defined in section 6.8.2 of the AV1 Specification;

  - `flags.segmentation_enabled` is interpreted as defined in section 6.8.13 of the AV1 Specification;

  - `RefFrameId` is interpreted as the element of the `RefFrameId` array defined in section 6.8.2 of the AV1 Specification corresponding to the reference frame;

  - `frame_type` is interpreted as defined in section 6.8.2 of the AV1 Specification;

  - `OrderHint` is interpreted as defined in section 6.8.2 of the AV1 Specification;

  - `pExtensionHeader` is `NULL` or a pointer to a `StdVideoEncodeAV1ExtensionHeader` structure whose `temporal_id` and `spatial_id` members specify the temporal and spatial layer ID of the reference frame, respectively.

Valid Usage (Implicit)

- VUID-VkVideoEncodeAV1DpbSlotInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_ENCODE_AV1_DPB_SLOT_INFO_KHR`

- VUID-VkVideoEncodeAV1DpbSlotInfoKHR-pStdReferenceInfo-parameter
  `pStdReferenceInfo` must be a valid pointer to a valid `StdVideoEncodeAV1ReferenceInfo` value

## See Also

VK_KHR_video_encode_av1, 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