VkVideoEncodeH264DpbSlotInfoKHR

The VkVideoEncodeH264DpbSlotInfoKHR structure is defined as:

typedef struct VkVideoEncodeH264DpbSlotInfoKHR {
    VkStructureType sType;
    const void* pNext;
    const StdVideoEncodeH264ReferenceInfo* pStdReferenceInfo;
} VkVideoEncodeH264DpbSlotInfoKHR;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• pStdReferenceInfo is a pointer to a StdVideoEncodeH264ReferenceInfo structure specifying H.264 reference information.

This structure is specified in the pNext chain of VkVideoEncodeInfoKHR::pSetupReferenceSlot, if not NULL, and the pNext chain of the elements of VkVideoEncodeInfoKHR::pReferenceSlots to specify the codec-specific reference picture information for an H.264 encode operation.

Active Reference Picture Information

When this structure is specified in the pNext chain of the elements of VkVideoEncodeInfoKHR::pReferenceSlots, one element is added to the list of active reference pictures used by the video encode operation for each element of VkVideoEncodeInfoKHR::pReferenceSlots as follows:

• The image subregion used is determined according to the H.264 Encode Picture Data Access section.
• The reference picture is associated with the DPB slot index specified in the slotIndex member of the corresponding element of VkVideoEncodeInfoKHR::pReferenceSlots.
• The reference picture is associated with the H.264 reference information provided in pStdReferenceInfo.

Reconstructed Picture Information

When this structure is specified in the pNext chain of VkVideoEncodeInfoKHR::pSetupReferenceSlot, the information related to the reconstructed picture is defined as follows:

• The image subregion used is determined according to the H.264 Encode Picture Data Access section.
• If reference picture setup is requested, then the reconstructed picture is used to activate the DPB slot with the index specified in VkVideoEncodeInfoKHR::pSetupReferenceSlot→slotIndex.
• The reconstructed picture is associated with the H.264 reference information provided in pStdReferenceInfo.

Std Reference Information

The members of the StdVideoEncodeH264ReferenceInfo structure pointed to by pStdReferenceInfo are interpreted as follows:

• flags.reserved is used only for padding purposes and is otherwise ignored;
• flags.used_for_long_term_reference is used to indicate whether the picture is marked as used for long-term reference as defined in section 8.2.5.1 of the ITU-T H.264 Specification;
• primary_pic_type as defined in section 7.4.2 of the ITU-T H.264 Specification;
• long_term_pic_num and long_term_frame_idx as defined in section 7.4.3 of the ITU-T H.264 Specification;
• temporal_id as defined in section G.7.4.1.1 of the ITU-T H.264 Specification;
• all other members are interpreted as defined in section 8.2 of the ITU-T H.264 Specification.