# VkVideoChromaSubsamplingFlagBitsKHR(3) Manual Page

## Name

VkVideoChromaSubsamplingFlagBitsKHR - Video format chroma subsampling bits

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## C Specification

The video format chroma subsampling is defined with the following enums:

    // Provided by VK_KHR_video_queue
    typedef enum VkVideoChromaSubsamplingFlagBitsKHR {
        VK_VIDEO_CHROMA_SUBSAMPLING_INVALID_KHR = 0,
        VK_VIDEO_CHROMA_SUBSAMPLING_MONOCHROME_BIT_KHR = 0x00000001,
        VK_VIDEO_CHROMA_SUBSAMPLING_420_BIT_KHR = 0x00000002,
        VK_VIDEO_CHROMA_SUBSAMPLING_422_BIT_KHR = 0x00000004,
        VK_VIDEO_CHROMA_SUBSAMPLING_444_BIT_KHR = 0x00000008,
    } VkVideoChromaSubsamplingFlagBitsKHR;

## Description

- `VK_VIDEO_CHROMA_SUBSAMPLING_MONOCHROME_BIT_KHR` specifies that the format is monochrome.

- `VK_VIDEO_CHROMA_SUBSAMPLING_420_BIT_KHR` specified that the format is 4:2:0 chroma subsampled, i.e. the two chroma components are sampled horizontally and vertically at half the sample rate of the luma component.

- `VK_VIDEO_CHROMA_SUBSAMPLING_422_BIT_KHR` - the format is 4:2:2 chroma subsampled, i.e. the two chroma components are sampled horizontally at half the sample rate of luma component.

- `VK_VIDEO_CHROMA_SUBSAMPLING_444_BIT_KHR` - the format is 4:4:4 chroma sampled, i.e. all three components of the Y′CBCR format are sampled at the same rate, thus there is no chroma subsampling.

## See Also

VK_KHR_video_queue, VkVideoChromaSubsamplingFlagsKHR

## 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