VkVideoEncodeH264QualityLevelPropertiesKHR

When calling vkGetPhysicalDeviceVideoEncodeQualityLevelPropertiesKHR with pVideoProfile→videoCodecOperation specified as VK_VIDEO_CODEC_OPERATION_ENCODE_H264_BIT_KHR, the VkVideoEncodeH264QualityLevelPropertiesKHR structure must be included in the pNext chain of the VkVideoEncodeQualityLevelPropertiesKHR structure to retrieve additional video encode quality level properties specific to H.264 encoding.

The VkVideoEncodeH264QualityLevelPropertiesKHR structure is defined as:

typedef struct VkVideoEncodeH264QualityLevelPropertiesKHR {
    VkStructureType sType;
    void* pNext;
    VkVideoEncodeH264RateControlFlagsKHR preferredRateControlFlags;
    uint32_t preferredGopFrameCount;
    uint32_t preferredIdrPeriod;
    uint32_t preferredConsecutiveBFrameCount;
    uint32_t preferredTemporalLayerCount;
    VkVideoEncodeH264QpKHR preferredConstantQp;
    uint32_t preferredMaxL0ReferenceCount;
    uint32_t preferredMaxL1ReferenceCount;
    VkBool32 preferredStdEntropyCodingModeFlag;
} VkVideoEncodeH264QualityLevelPropertiesKHR;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• preferredRateControlFlags is a bitmask of VkVideoEncodeH264RateControlFlagBitsKHR values indicating the preferred flags to use for VkVideoEncodeH264RateControlInfoKHR::flags.
• preferredGopFrameCount indicates the preferred value to use for VkVideoEncodeH264RateControlInfoKHR::gopFrameCount.
• preferredIdrPeriod indicates the preferred value to use for VkVideoEncodeH264RateControlInfoKHR::idrPeriod.
• preferredConsecutiveBFrameCount indicates the preferred value to use for VkVideoEncodeH264RateControlInfoKHR::consecutiveBFrameCount.
• preferredTemporalLayerCount indicates the preferred value to use for VkVideoEncodeH264RateControlInfoKHR::temporalLayerCount.
• preferredConstantQp indicates the preferred values to use for VkVideoEncodeH264NaluSliceInfoKHR::constantQp for each picture type when using rate control mode
  VK_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 for entropy_coding_mode_flag in StdVideoH264PpsFlags.