VkVideoEncodeAV1RateControlInfoKHR

The VkVideoEncodeAV1RateControlInfoKHR structure is defined as:

typedef struct VkVideoEncodeAV1RateControlInfoKHR {
    VkStructureType sType;
    const void* pNext;
    VkVideoEncodeAV1RateControlFlagsKHR flags;
    uint32_t gopFrameCount;
    uint32_t keyFramePeriod;
    uint32_t consecutiveBipredictiveFrameCount;
    uint32_t temporalLayerCount;
} VkVideoEncodeAV1RateControlInfoKHR;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• flags is a bitmask of VkVideoEncodeAV1RateControlFlagBitsKHR specifying AV1 rate control flags.
• gopFrameCount is the number of frames within a group of pictures (GOP) intended to be used by the application. If it is set to 0, the rate control algorithm may assume an implementation-dependent GOP length. If it is set to UINT32_MAX, the GOP length is treated as infinite.
• keyFramePeriod is the interval, in terms of number of frames, between two frames with the AV1 frame type STD_VIDEO_AV1_FRAME_TYPE_KEY (see key frame period). If it is set to 0, the rate control algorithm may assume an implementation-dependent key frame period. If it is set to UINT32_MAX, the key frame period is treated as infinite.
• consecutiveBipredictiveFrameCount is the number of consecutive frames encoded with VK_VIDEO_ENCODE_AV1_RATE_CONTROL_GROUP_BIPREDICTIVE_KHR between frames encoded with other rate control groups within the GOP.
• temporalLayerCount specifies the number of AV1 temporal layers that the application intends to use.

When an instance of this structure is included in the pNext chain of the VkVideoCodingControlInfoKHR structure passed to the vkCmdControlVideoCodingKHR command, and VkVideoCodingControlInfoKHR::flags includes VK_VIDEO_CODING_CONTROL_ENCODE_RATE_CONTROL_BIT_KHR, the parameters in this structure are used as guidance for the implementation’s rate control algorithm (see Video Coding Control).