# VkVideoDecodeVP9PictureInfoKHR(3) Manual Page

## Name

VkVideoDecodeVP9PictureInfoKHR - Structure specifies VP9 picture information when decoding a frame

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## C Specification

The `VkVideoDecodeVP9PictureInfoKHR` structure is defined as:

    // Provided by VK_KHR_video_decode_vp9
    typedef struct VkVideoDecodeVP9PictureInfoKHR {
        VkStructureType                        sType;
        const void*                            pNext;
        const StdVideoDecodeVP9PictureInfo*    pStdPictureInfo;
        int32_t                                referenceNameSlotIndices[VK_MAX_VIDEO_VP9_REFERENCES_PER_FRAME_KHR];
        uint32_t                               uncompressedHeaderOffset;
        uint32_t                               compressedHeaderOffset;
        uint32_t                               tilesOffset;
    } VkVideoDecodeVP9PictureInfoKHR;

## Members

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

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

- `pStdPictureInfo` is a pointer to a `StdVideoDecodeVP9PictureInfo` structure specifying VP9 picture information.

- `referenceNameSlotIndices` is an array of three (`VK_MAX_VIDEO_VP9_REFERENCES_PER_FRAME_KHR`, which is equal to the Video Std definition `STD_VIDEO_VP9_REFS_PER_FRAME`) signed integer values specifying the index of the DPB slot or a negative integer value for each VP9 reference name used for inter coding. In particular, the DPB slot index for the VP9 reference name `frame` is specified in `referenceNameSlotIndices`[`frame` - `STD_VIDEO_VP9_REFERENCE_NAME_LAST_FRAME`].

- `uncompressedHeaderOffset` is the byte offset of the uncompressed frame header, as defined in section 6.2 of the VP9 Specification.

- `compressedHeaderOffset` is the byte offset of the compressed frame header, as defined in section 6.3 of the VP9 Specification.

- `tilesOffset` is the byte offset of the frame tile data, as defined in section 6.4 of the VP9 Specification.

## Description

This structure is specified in the `pNext` chain of the VkVideoDecodeInfoKHR structure passed to vkCmdDecodeVideoKHR to specify the codec-specific picture information for an VP9 decode operation.

Decode Output Picture Information

  When this structure is specified in the `pNext` chain of the VkVideoDecodeInfoKHR structure passed to vkCmdDecodeVideoKHR, the information related to the decode output picture is defined as follows:

  - The image subregion used is determined according to the VP9 Decode Picture Data Access section.

  - The decode output picture is associated with the VP9 picture information provided in `pStdPictureInfo`.

Std Picture Information

  The members of the `StdVideoDecodeVP9PictureInfo` structure pointed to by `pStdPictureInfo` are interpreted as follows:

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

  - `ref_frame_sign_bias_mask` is a bitmask where bit index i corresponds to `ref_frame_sign_bias[i]` as defined in section 7.2 of the VP9 Specification;

  - the `StdVideoVP9ColorConfig` structure pointed to by `pColorConfig` is interpreted as follows:

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

    - all other members of `StdVideoVP9ColorConfig` are interpreted as defined in sections 6.2, 6.2.2, and 7.2.2 of the VP9 Specification;

  - the `StdVideoVP9LoopFilter` structure pointed to by `pLoopFilter` is interpreted as follows:

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

    - `update_ref_delta` is a bitmask where bit index i is interpreted as the value of `update_ref_delta` corresponding to element i of `loop_filter_ref_deltas` as defined in section 7.2.8 of the VP9 Specification;

    - `update_mode_delta` is a bitmask where bit index i is interpreted as the value of `update_mode_delta` corresponding to element i of `loop_filter_mode_deltas` as defined in section 7.2.8 of the VP9 Specification;

    - all other members of `StdVideoVP9LoopFilter` are interpreted as defined in section 7.2.8 of the VP9 Specification;

      Note | If the syntax elements corresponding to `loop_filter_ref_deltas` and `loop_filter_mode_deltas` are not present, the application should specify the previous values, as defined in section 7.2.8 of the VP9 Specification.

  - if `flags.segmentation_enabled` is set, then the `StdVideoVP9Segmentation` structure pointed to by `pSegmentation` is interpreted as follows:

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

    - the elements of `FeatureEnabled` are bitmasks where bit index j of element i corresponds to `FeatureEnabled[i][j]` as defined in section 6.2.11 of the VP9 Specification;

    - `FeatureData` is interpreted as defined in section 6.2.11 of the VP9 Specification;

    - all other members of `StdVideoVP9Segmentation` are interpreted as defined in section 7.2.10 of the VP9 Specification;

  - all other members are interpreted as defined in section 7.2 of the VP9 Specification.

Reference picture setup is controlled by the value of `StdVideoDecodeVP9PictureInfo`::`refresh_frame_flags`. If it is not zero and a reconstructed picture is specified, then the latter is used as the target of picture reconstruction to activate the DPB slot specified in `pDecodeInfo->pSetupReferenceSlot->slotIndex`. If `StdVideoDecodeVP9PictureInfo`::`refresh_frame_flags` is zero, but a reconstructed picture is specified, then the corresponding picture reference associated with the DPB slot is invalidated, as described in the DPB Slot States section.

Valid Usage (Implicit)

- VUID-VkVideoDecodeVP9PictureInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_DECODE_VP9_PICTURE_INFO_KHR`

- VUID-VkVideoDecodeVP9PictureInfoKHR-pStdPictureInfo-parameter
  `pStdPictureInfo` must be a valid pointer to a valid `StdVideoDecodeVP9PictureInfo` value

## See Also

VK_KHR_video_decode_vp9, 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