C Specification

The range-compressed values are converted between color models, according to the color model conversion specified in the rgbModel member of the VkVideoEncodeSessionRgbConversionCreateInfoVALVE structure.

VkVideoEncodeRgbModelConversionFlagBitsVALVE defines the conversion from the encode input picture's color model to the encode color model.

// Provided by VK_VALVE_video_encode_rgb_conversion
typedef enum VkVideoEncodeRgbModelConversionFlagBitsVALVE {
    VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_RGB_IDENTITY_BIT_VALVE = 0x00000001,
    VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_IDENTITY_BIT_VALVE = 0x00000002,
    VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_709_BIT_VALVE = 0x00000004,
    VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_601_BIT_VALVE = 0x00000008,
    VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_2020_BIT_VALVE = 0x00000010,
} VkVideoEncodeRgbModelConversionFlagBitsVALVE;

Description

  • VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_RGB_IDENTITY_BIT_VALVE specifies the color components are not modified by the color model conversion since they are assumed to represent the desired color model for video coding; R′G′B′ range compression is applied to the components.

  • VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_IDENTITY_BIT_VALVE specifies the color components are not modified by the color model conversion are assumed to be treated as though in Y′CBCR form; video encode R′G′B′ range compression and video encode R′G′B′ chroma subsampling is also ignored.

  • VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_709_BIT_VALVE specifies the color components are transformed from an R′G′B′ representation to a Y′CBCR representation as described in the “BT.709 Y′CBCR conversion” section of the Khronos Data Format Specification.

  • VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_601_BIT_VALVE specifies the color components are transformed from an R′G′B′ representation to a Y′CBCR representation as described in the “BT.601 Y′CBCR conversion” section of the Khronos Data Format Specification.

  • VK_VIDEO_ENCODE_RGB_MODEL_CONVERSION_YCBCR_2020_BIT_VALVE specifies the color components are transformed from an R′G′B′ representation to a Y′CBCR representation as described in the “BT.2020 Y′CBCR conversion” section of the Khronos Data Format Specification.

Note

Video encode R′G′B′ model conversion transformations have the inverse definition of sampler Y′CBCR model conversion transformations.
Note

The video encode R′G′B′ model conversion step does not apply any transfer function, only converting from R′G′B′ to Y′CBCR using the primaries of the specified rgbModel color model.

See Also

VK_VALVE_video_encode_rgb_conversion, VkVideoEncodeRgbModelConversionFlagsVALVE, VkVideoEncodeSessionRgbConversionCreateInfoVALVE

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