C Specification
When calling vkGetPhysicalDeviceVideoEncodeQualityLevelPropertiesKHR
with pVideoProfile->videoCodecOperation
specified as
VK_VIDEO_CODEC_OPERATION_ENCODE_H264_BIT_EXT
, the
VkVideoEncodeH264QualityLevelPropertiesEXT structure can be included
in the pNext
chain of the VkVideoEncodeQualityLevelPropertiesKHR
structure to retrieve additional video encode quality level properties
specific to H.264 encoding.
The VkVideoEncodeH264QualityLevelPropertiesEXT structure is defined as:
// Provided by VK_EXT_video_encode_h264
typedef struct VkVideoEncodeH264QualityLevelPropertiesEXT {
VkStructureType sType;
void* pNext;
VkVideoEncodeH264RateControlFlagsEXT preferredRateControlFlags;
uint32_t preferredGopFrameCount;
uint32_t preferredIdrPeriod;
uint32_t preferredConsecutiveBFrameCount;
uint32_t preferredTemporalLayerCount;
VkVideoEncodeH264QpEXT preferredConstantQp;
uint32_t preferredMaxL0ReferenceCount;
uint32_t preferredMaxL1ReferenceCount;
VkBool32 preferredStdEntropyCodingModeFlag;
} VkVideoEncodeH264QualityLevelPropertiesEXT;
Members
-
sType
is the type of this structure. -
pNext
isNULL
or a pointer to a structure extending this structure. -
preferredRateControlFlags
is a bitmask of VkVideoEncodeH264RateControlFlagBitsEXT values indicating the preferred flags to use for VkVideoEncodeH264RateControlInfoEXT::flags
. -
preferredGopFrameCount
indicates the preferred value to use for VkVideoEncodeH264RateControlInfoEXT::gopFrameCount
. -
preferredIdrPeriod
indicates the preferred value to use for VkVideoEncodeH264RateControlInfoEXT::idrPeriod
. -
preferredConsecutiveBFrameCount
indicates the preferred value to use for VkVideoEncodeH264RateControlInfoEXT::consecutiveBFrameCount
. -
preferredTemporalLayerCount
indicates the preferred value to use for VkVideoEncodeH264RateControlInfoEXT::temporalLayerCount
. -
preferredConstantQp
indicates the preferred values to use for VkVideoEncodeH264NaluSliceInfoEXT::constantQp
for each picture type when using rate control modeVK_VIDEO_ENCODE_RATE_CONTROL_MODE_DISABLED_BIT_KHR
. -
preferredMaxL0ReferenceCount
indicates the preferred maximum number of reference pictures to use in the reference list L0. -
preferredMaxL1ReferenceCount
indicates the preferred maximum number of reference pictures to use in the reference list L1. -
preferredStdEntropyCodingModeFlag
indicates the preferred value to use forentropy_coding_mode_flag
inStdVideoH264PpsFlags
.
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.