C Specification
When calling vkGetPhysicalDeviceVideoFormatPropertiesKHR, the
VkVideoFormatH265QuantizationMapPropertiesKHR
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 H.265 encode profile.
The VkVideoFormatH265QuantizationMapPropertiesKHR
structure is defined
as:
// Provided by VK_KHR_video_encode_h265 with VK_KHR_video_encode_quantization_map
typedef struct VkVideoFormatH265QuantizationMapPropertiesKHR {
VkStructureType sType;
void* pNext;
VkVideoEncodeH265CtbSizeFlagsKHR compatibleCtbSizes;
} VkVideoFormatH265QuantizationMapPropertiesKHR;
Members
-
sType
is a VkStructureType value identifying this structure. -
pNext
isNULL
or a pointer to a structure extending this structure. -
compatibleCtbSizes
is a bitmask of VkVideoEncodeH265CtbSizeFlagBitsKHR indicating the CTB sizes that quantization maps using this video format are compatible with.NoteThe value of
compatibleCtbSizes
does not limit the use of the specific quantization map format, but does limit the implementation in being able to encode pictures with CTB sizes not included incompatibleCtbSizes
but otherwise supported by the used video profile, as indicated by VkVideoEncodeH265CapabilitiesKHR::ctbSizes
. In particular, using smaller quantization map texel sizes may prevent implementations from encoding with larger CTB 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
.
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.