# VkVideoFormatAV1QuantizationMapPropertiesKHR(3) Manual Page

## Name

VkVideoFormatAV1QuantizationMapPropertiesKHR - Structure describing AV1 quantization map properties

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## C Specification

When calling vkGetPhysicalDeviceVideoFormatPropertiesKHR, the `VkVideoFormatAV1QuantizationMapPropertiesKHR` structure can be included in the `pNext` chain of the VkVideoFormatPropertiesKHR structure to retrieve video format properties specific to video encode quantization maps used with an AV1 encode profile.

The `VkVideoFormatAV1QuantizationMapPropertiesKHR` structure is defined as:

    // Provided by VK_KHR_video_encode_av1 with VK_KHR_video_encode_quantization_map
    typedef struct VkVideoFormatAV1QuantizationMapPropertiesKHR {
        VkStructureType                           sType;
        void*                                     pNext;
        VkVideoEncodeAV1SuperblockSizeFlagsKHR    compatibleSuperblockSizes;
    } VkVideoFormatAV1QuantizationMapPropertiesKHR;

## Members

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

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

- `compatibleSuperblockSizes` is a bitmask of VkVideoEncodeAV1SuperblockSizeFlagBitsKHR indicating the AV1 superblock sizes that quantization maps using this video format are compatible with.

  Note | The value of `compatibleSuperblockSizes` does not limit the use of the specific quantization map format, but does limit the implementation in being able to encode pictures with superblock sizes not included in `compatibleSuperblockSizes` but otherwise supported by the used video profile, as indicated by VkVideoEncodeAV1CapabilitiesKHR::`superblockSizes`. In particular, using smaller quantization map texel sizes may prevent implementations from encoding with larger superblock sizes which may have a negative impact on the efficiency of the encoder.

## Description

The values returned in this structure are only defined if the allowed image usage flags returned in VkVideoFormatPropertiesKHR::`imageUsageFlags` for this video format include `VK_IMAGE_USAGE_VIDEO_ENCODE_QUANTIZATION_DELTA_MAP_BIT_KHR` or `VK_IMAGE_USAGE_VIDEO_ENCODE_EMPHASIS_MAP_BIT_KHR`.

Valid Usage (Implicit)

- VUID-VkVideoFormatAV1QuantizationMapPropertiesKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_VIDEO_FORMAT_AV1_QUANTIZATION_MAP_PROPERTIES_KHR`

## See Also

VK_KHR_video_encode_av1, VK_KHR_video_encode_quantization_map, VkStructureType, VkVideoEncodeAV1SuperblockSizeFlagsKHR

## 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