# VkVideoCapabilitiesKHR(3) Manual Page

## Name

VkVideoCapabilitiesKHR - Structure describing general video capabilities for a video profile

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## C Specification

The `VkVideoCapabilitiesKHR` structure is defined as:

    // Provided by VK_KHR_video_queue
    typedef struct VkVideoCapabilitiesKHR {
        VkStructureType              sType;
        void*                        pNext;
        VkVideoCapabilityFlagsKHR    flags;
        VkDeviceSize                 minBitstreamBufferOffsetAlignment;
        VkDeviceSize                 minBitstreamBufferSizeAlignment;
        VkExtent2D                   pictureAccessGranularity;
        VkExtent2D                   minCodedExtent;
        VkExtent2D                   maxCodedExtent;
        uint32_t                     maxDpbSlots;
        uint32_t                     maxActiveReferencePictures;
        VkExtensionProperties        stdHeaderVersion;
    } VkVideoCapabilitiesKHR;

## Members

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

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

- `flags` is a bitmask of VkVideoCapabilityFlagBitsKHR specifying capability flags.

- `minBitstreamBufferOffsetAlignment` is the minimum alignment for bitstream buffer offsets.

- `minBitstreamBufferSizeAlignment` is the minimum alignment for bitstream buffer range sizes.

- `pictureAccessGranularity` is the granularity at which image access to video picture resources happen.

- `minCodedExtent` is the minimum width and height of the coded frames.

- `maxCodedExtent` is the maximum width and height of the coded frames.

- `maxDpbSlots` is the maximum number of DPB slots supported by a single video session.

- `maxActiveReferencePictures` is the maximum number of active reference pictures a single video coding operation can use.

- `stdHeaderVersion` is a VkExtensionProperties structure reporting the Video Std header name and version supported for the video profile.

## Description

Note | It is common for video compression standards to allow using all reference pictures associated with active DPB slots as active reference pictures, hence for video decode profiles the values returned in `maxDpbSlots` and `maxActiveReferencePictures` are often equal. Similarly, in case of video decode profiles supporting field pictures the value of `maxActiveReferencePictures` often equals `maxDpbSlots` × 2.

Valid Usage (Implicit)

- VUID-VkVideoCapabilitiesKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_CAPABILITIES_KHR`

- VUID-VkVideoCapabilitiesKHR-pNext-pNext
  Each `pNext` member of any structure (including this one) in the `pNext` chain must be either `NULL` or a pointer to a valid instance of VkVideoDecodeAV1CapabilitiesKHR, VkVideoDecodeCapabilitiesKHR, VkVideoDecodeH264CapabilitiesKHR, VkVideoDecodeH265CapabilitiesKHR, VkVideoEncodeAV1CapabilitiesKHR, VkVideoEncodeAV1QuantizationMapCapabilitiesKHR, VkVideoEncodeCapabilitiesKHR, VkVideoEncodeH264CapabilitiesKHR, VkVideoEncodeH264QuantizationMapCapabilitiesKHR, VkVideoEncodeH265CapabilitiesKHR, VkVideoEncodeH265QuantizationMapCapabilitiesKHR, or VkVideoEncodeQuantizationMapCapabilitiesKHR

- VUID-VkVideoCapabilitiesKHR-sType-unique
  The `sType` value of each struct in the `pNext` chain must be unique

## See Also

VK_KHR_video_queue, VkDeviceSize, VkExtensionProperties, VkExtent2D, VkStructureType, VkVideoCapabilityFlagsKHR, vkGetPhysicalDeviceVideoCapabilitiesKHR

## 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