VkVideoEncodeAV1QualityLevelPropertiesKHR

When calling vkGetPhysicalDeviceVideoEncodeQualityLevelPropertiesKHR with pVideoProfile→videoCodecOperation specified as VK_VIDEO_CODEC_OPERATION_ENCODE_AV1_BIT_KHR, the VkVideoEncodeAV1QualityLevelPropertiesKHR structure must be included in the pNext chain of the VkVideoEncodeQualityLevelPropertiesKHR structure to retrieve additional video encode quality level properties specific to AV1 encoding.

The VkVideoEncodeAV1QualityLevelPropertiesKHR structure is defined as:

typedef struct VkVideoEncodeAV1QualityLevelPropertiesKHR {
    VkStructureType sType;
    void* pNext;
    VkVideoEncodeAV1RateControlFlagsKHR preferredRateControlFlags;
    uint32_t preferredGopFrameCount;
    uint32_t preferredKeyFramePeriod;
    uint32_t preferredConsecutiveBipredictiveFrameCount;
    uint32_t preferredTemporalLayerCount;
    VkVideoEncodeAV1QIndexKHR preferredConstantQIndex;
    uint32_t preferredMaxSingleReferenceCount;
    uint32_t preferredSingleReferenceNameMask;
    uint32_t preferredMaxUnidirectionalCompoundReferenceCount;
    uint32_t preferredMaxUnidirectionalCompoundGroup1ReferenceCount;
    uint32_t preferredUnidirectionalCompoundReferenceNameMask;
    uint32_t preferredMaxBidirectionalCompoundReferenceCount;
    uint32_t preferredMaxBidirectionalCompoundGroup1ReferenceCount;
    uint32_t preferredMaxBidirectionalCompoundGroup2ReferenceCount;
    uint32_t preferredBidirectionalCompoundReferenceNameMask;
} VkVideoEncodeAV1QualityLevelPropertiesKHR;

• 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 VkVideoEncodeAV1RateControlFlagBitsKHR values indicating the preferred flags to use for VkVideoEncodeAV1RateControlInfoKHR::flags.
• preferredGopFrameCount indicates the preferred value to use for VkVideoEncodeAV1RateControlInfoKHR::gopFrameCount.
• preferredKeyFramePeriod indicates the preferred value to use for VkVideoEncodeAV1RateControlInfoKHR::keyFramePeriod.
• preferredConsecutiveBipredictiveFrameCount indicates the preferred value to use for VkVideoEncodeAV1RateControlInfoKHR::consecutiveBipredictiveFrameCount.
• preferredTemporalLayerCount indicates the preferred value to use for VkVideoEncodeAV1RateControlInfoKHR::temporalLayerCount.
• preferredConstantQIndex indicates the preferred value to use for VkVideoEncodeAV1PictureInfoKHR::constantQIndex when using rate control mode
  VK_VIDEO_ENCODE_RATE_CONTROL_MODE_DISABLED_BIT_KHR.
• preferredMaxSingleReferenceCount indicates the preferred maximum number of reference pictures to use with single reference prediction mode.
• preferredSingleReferenceNameMask is a bitmask of preferred AV1 reference names when using single reference prediction mode.
• preferredMaxUnidirectionalCompoundReferenceCount indicates the preferred maximum number of reference pictures to use with unidirectional compound prediction mode.
• preferredMaxUnidirectionalCompoundGroup1ReferenceCount indicates the preferred maximum number of reference pictures to use with unidirectional compound prediction mode from reference frame group 1, as defined in section 6.10.24 of the AV1 Specification.
• preferredUnidirectionalCompoundReferenceNameMask is a bitmask of preferred AV1 reference names when using unidirectional compound prediction mode.
• preferredMaxBidirectionalCompoundReferenceCount indicates the preferred maximum number of reference pictures to use with bidirectional compound prediction mode.
• preferredMaxBidirectionalCompoundGroup1ReferenceCount indicates the preferred maximum number of reference pictures to use with bidirectional compound prediction mode from reference frame group 1, as defined in section 6.10.24 of the AV1 Specification.
• preferredMaxBidirectionalCompoundGroup2ReferenceCount indicates the preferred maximum number of reference pictures to use with bidirectional compound prediction mode from reference frame group 2, as defined in section 6.10.24 of the AV1 Specification.
• preferredBidirectionalCompoundReferenceNameMask is a bitmask of preferred AV1 reference names when using bidirectional compound prediction mode.

preferredSingleReferenceNameMask, preferredUnidirectionalCompoundReferenceNameMask, and preferredBidirectionalCompoundReferenceNameMask are encoded such that when bit index i is set, it indicates preference for using the AV1 reference name

STD_VIDEO_AV1_REFERENCE_NAME_LAST_FRAME + i.