VK_KHR_video_encode_h265

typedef struct VkVideoEncodeH265ProfileInfoKHR {
    VkStructureType                              sType;
    const void*                                  pNext;
    StdVideoH265ProfileIdc                       stdProfileIdc;
} VkVideoEncodeH265ProfileInfoKHR;

typedef struct VkVideoEncodeH265CapabilitiesKHR {
    VkStructureType                                sType;
    void*                                          pNext;
    VkVideoEncodeH265CapabilityFlagsKHR            flags;
    StdVideoH265LevelIdc                           maxLevelIdc;
    uint32_t                                       maxSliceSegmentCount;
    VkExtent2D                                     maxTiles;
    VkVideoEncodeH265CtbSizeFlagsKHR               ctbSizes;
    VkVideoEncodeH265TransformBlockSizeFlagsKHR    transformBlockSizes;
    uint32_t                                       maxPPictureL0ReferenceCount;
    uint32_t                                       maxBPictureL0ReferenceCount;
    uint32_t                                       maxL1ReferenceCount;
    uint32_t                                       maxSubLayerCount;
    VkBool32                                       expectDyadicTemporalSubLayerPattern;
    int32_t                                        minQp;
    int32_t                                        maxQp;
    VkBool32                                       prefersGopRemainingFrames;
    VkBool32                                       requiresGopRemainingFrames;
    VkVideoEncodeH265StdFlagsKHR                   stdSyntaxFlags;
} VkVideoEncodeH265CapabilitiesKHR;

typedef struct VkVideoEncodeH265SessionParametersCreateInfoKHR {
    VkStructureType                                        sType;
    const void*                                            pNext;
    uint32_t                                               maxStdVPSCount;
    uint32_t                                               maxStdSPSCount;
    uint32_t                                               maxStdPPSCount;
    const VkVideoEncodeH265SessionParametersAddInfoKHR*    pParametersAddInfo;
} VkVideoEncodeH265SessionParametersCreateInfoKHR;

typedef struct VkVideoEncodeH265SessionParametersAddInfoKHR {
    VkStructureType                            sType;
    const void*                                pNext;
    uint32_t                                   stdVPSCount;
    const StdVideoH265VideoParameterSet*       pStdVPSs;
    uint32_t                                   stdSPSCount;
    const StdVideoH265SequenceParameterSet*    pStdSPSs;
    uint32_t                                   stdPPSCount;
    const StdVideoH265PictureParameterSet*     pStdPPSs;
} VkVideoEncodeH265SessionParametersAddInfoKHR;

typedef struct VkVideoEncodeH265SessionParametersGetInfoKHR {
    VkStructureType    sType;
    const void*        pNext;
    VkBool32           writeStdVPS;
    VkBool32           writeStdSPS;
    VkBool32           writeStdPPS;
    uint32_t           stdVPSId;
    uint32_t           stdSPSId;
    uint32_t           stdPPSId;
} VkVideoEncodeH265SessionParametersGetInfoKHR;

typedef struct VkVideoEncodeH265SessionParametersFeedbackInfoKHR {
    VkStructureType    sType;
    void*              pNext;
    VkBool32           hasStdVPSOverrides;
    VkBool32           hasStdSPSOverrides;
    VkBool32           hasStdPPSOverrides;
} VkVideoEncodeH265SessionParametersFeedbackInfoKHR;

typedef struct VkVideoEncodeH265PictureInfoKHR {
    VkStructureType                                    sType;
    const void*                                        pNext;
    uint32_t                                           naluSliceSegmentEntryCount;
    const VkVideoEncodeH265NaluSliceSegmentInfoKHR*    pNaluSliceSegmentEntries;
    const StdVideoEncodeH265PictureInfo*               pStdPictureInfo;
} VkVideoEncodeH265PictureInfoKHR;

typedef struct VkVideoEncodeH265NaluSliceSegmentInfoKHR {
    VkStructureType                                sType;
    const void*                                    pNext;
    int32_t                                        constantQp;
    const StdVideoEncodeH265SliceSegmentHeader*    pStdSliceSegmentHeader;
} VkVideoEncodeH265NaluSliceSegmentInfoKHR;

typedef struct VkVideoEncodeH265DpbSlotInfoKHR {
    VkStructureType                           sType;
    const void*                               pNext;
    const StdVideoEncodeH265ReferenceInfo*    pStdReferenceInfo;
} VkVideoEncodeH265DpbSlotInfoKHR;

typedef struct VkVideoEncodeH265RateControlInfoKHR {
    VkStructureType                         sType;
    const void*                             pNext;
    VkVideoEncodeH265RateControlFlagsKHR    flags;
    uint32_t                                gopFrameCount;
    uint32_t                                idrPeriod;
    uint32_t                                consecutiveBFrameCount;
    uint32_t                                subLayerCount;
} VkVideoEncodeH265RateControlInfoKHR;

typedef struct VkVideoEncodeH265RateControlLayerInfoKHR {
    VkStructureType                  sType;
    const void*                      pNext;
    VkBool32                         useMinQp;
    VkVideoEncodeH265QpKHR           minQp;
    VkBool32                         useMaxQp;
    VkVideoEncodeH265QpKHR           maxQp;
    VkBool32                         useMaxFrameSize;
    VkVideoEncodeH265FrameSizeKHR    maxFrameSize;
} VkVideoEncodeH265RateControlLayerInfoKHR;

typedef struct VkVideoEncodeH265GopRemainingFrameInfoKHR {
    VkStructureType    sType;
    const void*        pNext;
    VkBool32           useGopRemainingFrames;
    uint32_t           gopRemainingI;
    uint32_t           gopRemainingP;
    uint32_t           gopRemainingB;
} VkVideoEncodeH265GopRemainingFrameInfoKHR;

uint32_t queueFamilyIndex;
uint32_t queueFamilyCount;

vkGetPhysicalDeviceQueueFamilyProperties2(physicalDevice, &queueFamilyCount, NULL);

VkQueueFamilyProperties2* props = calloc(queueFamilyCount,
    sizeof(VkQueueFamilyProperties2));
VkQueueFamilyVideoPropertiesKHR* videoProps = calloc(queueFamilyCount,
    sizeof(VkQueueFamilyVideoPropertiesKHR));

for (queueFamilyIndex = 0; queueFamilyIndex < queueFamilyCount; ++queueFamilyIndex) {
    props[queueFamilyIndex].sType = VK_STRUCTURE_TYPE_QUEUE_FAMILY_PROPERTIES_2;
    props[queueFamilyIndex].pNext = &videoProps[queueFamilyIndex];

    videoProps[queueFamilyIndex].sType = VK_STRUCTURE_TYPE_QUEUE_FAMILY_VIDEO_PROPERTIES_KHR;
}

vkGetPhysicalDeviceQueueFamilyProperties2(physicalDevice, &queueFamilyCount, props);

for (queueFamilyIndex = 0; queueFamilyIndex < queueFamilyCount; ++queueFamilyIndex) {
    if ((props[queueFamilyIndex].queueFamilyProperties.queueFlags & VK_QUEUE_VIDEO_ENCODE_BIT_KHR) != 0 &&
        (videoProps[queueFamilyIndex].videoCodecOperations & VK_VIDEO_CODEC_OPERATION_ENCODE_H265_BIT_KHR) != 0) {
        break;
    }
}

if (queueFamilyIndex < queueFamilyCount) {
    // Found appropriate queue family
    ...
} else {
    // Did not find a queue family with the needed capabilities
    ...
}

VkResult result;

VkVideoEncodeH265ProfileInfoKHR encodeH265ProfileInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_PROFILE_INFO_KHR,
    .pNext = NULL,
    .stdProfileIdc = STD_VIDEO_H265_PROFILE_IDC_MAIN
};

VkVideoProfileInfoKHR profileInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_PROFILE_INFO_KHR,
    .pNext = &encodeH265ProfileInfo,
    .videoCodecOperation = VK_VIDEO_CODEC_OPERATION_ENCODE_H265_BIT_KHR,
    .chromaSubsampling = VK_VIDEO_CHROMA_SUBSAMPLING_420_BIT_KHR,
    .lumaBitDepth = VK_VIDEO_COMPONENT_BIT_DEPTH_8_BIT_KHR,
    .chromaBitDepth = VK_VIDEO_COMPONENT_BIT_DEPTH_8_BIT_KHR
};

VkVideoEncodeH265CapabilitiesKHR encodeH265Capabilities = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_CAPABILITIES_KHR,
    .pNext = NULL,
};

VkVideoEncodeCapabilitiesKHR encodeCapabilities = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_CAPABILITIES_KHR,
    .pNext = &encodeH265Capabilities
}

VkVideoCapabilitiesKHR capabilities = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_CAPABILITIES_KHR,
    .pNext = &encodeCapabilities
};

result = vkGetPhysicalDeviceVideoCapabilitiesKHR(physicalDevice, &profileInfo, &capabilities);

if (result == VK_SUCCESS) {
    // Profile is supported, check additional capabilities
    ...
} else {
    // Profile is not supported, result provides additional information about why
    ...
}

VkVideoSessionParametersKHR videoSessionParams = VK_NULL_HANDLE;

VkVideoEncodeH265SessionParametersCreateInfoKHR encodeH265CreateInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_SESSION_PARAMETERS_CREATE_INFO_KHR,
    .pNext = NULL,
    .maxStdVPSCount = ... // VPS capacity
    .maxStdSPSCount = ... // SPS capacity
    .maxStdPPSCount = ... // PPS capacity
    .pParametersAddInfo = ... // parameters to add at creation time or NULL
};

VkVideoSessionParametersCreateInfoKHR createInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_SESSION_PARAMETERS_CREATE_INFO_KHR,
    .pNext = &encodeH265CreateInfo,
    .flags = 0,
    .videoSessionParametersTemplate = ... // template to use or VK_NULL_HANDLE
    .videoSession = videoSession
};

vkCreateVideoSessionParametersKHR(device, &createInfo, NULL, &videoSessionParams);

...

StdVideoH265VideoParameterSet vps = {};
// parse and populate VPS parameters
...

StdVideoH265SequenceParameterSet sps = {};
// parse and populate SPS parameters
...

StdVideoH265PictureParameterSet pps = {};
// parse and populate PPS parameters
...

VkVideoEncodeH265SessionParametersAddInfoKHR encodeH265AddInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_SESSION_PARAMETERS_ADD_INFO_KHR,
    .pNext = NULL,
    .stdVPSCount = 1,
    .pStdVPSs = &vps,
    .stdSPSCount = 1,
    .pStdSPSs = &sps,
    .stdPPSCount = 1,
    .pStdPPSs = &pps
};

VkVideoSessionParametersUpdateInfoKHR updateInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_SESSION_PARAMETERS_UPDATE_INFO_KHR,
    .pNext = &encodeH265AddInfo,
    .updateSequenceCount = 1 // incremented for each subsequent update
};

vkUpdateVideoSessionParametersKHR(device, &videoSessionParams, &updateInfo);

// Bound reference resource list provided has to include reconstructed picture resource
vkCmdBeginVideoCodingKHR(commandBuffer, ...);

StdVideoEncodeH265ReferenceInfo stdReferenceInfo = {};
// Populate H.265 reference picture info for the reconstructed picture
stdReferenceInfo.pic_type = STD_VIDEO_H265_PICTURE_TYPE_I;
...

VkVideoEncodeH265DpbSlotInfoKHR encodeH265DpbSlotInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_DPB_SLOT_INFO_KHR,
    .pNext = NULL,
    .pStdReferenceInfo = &stdReferenceInfo
};

VkVideoReferenceSlotInfoKHR setupSlotInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_REFERENCE_SLOT_INFO_KHR,
    .pNext = &encodeH265DpbSlotInfo
    ...
};

StdVideoEncodeH265ReferenceListsInfo stdRefListInfo = {};
// No references are used so just initialize the RefPicLists
for (uint32_t i = 0; i < STD_VIDEO_H265_MAX_NUM_LIST_REF; ++i) {
    stdRefListInfo.RefPicList0[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
    stdRefListInfo.RefPicList1[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
}
// Populate other H.265 reference list parameters
...

StdVideoEncodeH265PictureInfo stdPictureInfo = {};
// Populate H.265 picture info for the encode input picture
...
// Make sure that the reconstructed picture is requested to be set up as reference
stdPictureInfo.flags.is_reference = 1;
...
stdPictureInfo.pic_type = STD_VIDEO_H265_PICTURE_TYPE_I;
...
stdPictureInfo.pRefLists = &stdRefListInfo;
...

VkVideoEncodeH265PictureInfoKHR encodeH265PictureInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_PICTURE_INFO_KHR,
    .pNext = NULL,
    .naluSliceSegmentEntryCount = ... // number of slice segments to encode
    .pNaluSliceSegmentEntries = ... // pointer to the array of slice segment parameters
    .pStdPictureInfo = &stdPictureInfo
};

VkVideoEncodeInfoKHR encodeInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_INFO_KHR,
    .pNext = &encodeH265PictureInfo,
    ...
    .pSetupReferenceSlot = &setupSlotInfo,
    ...
};

vkCmdEncodeVideoKHR(commandBuffer, &encodeInfo);

vkCmdEndVideoCodingKHR(commandBuffer, ...);

// Bound reference resource list provided has to include the used reference picture resource
vkCmdBeginVideoCodingKHR(commandBuffer, ...);

StdVideoEncodeH265ReferenceInfo stdBackwardReferenceInfo = {};
// Populate H.265 reference picture info for the backward referenced picture
...

VkVideoEncodeH265DpbSlotInfoKHR encodeH265DpbSlotInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_DPB_SLOT_INFO_KHR,
    .pNext = NULL,
    .pStdReferenceInfo = &stdBackwardReferenceInfo
};

VkVideoReferenceSlotInfoKHR referenceSlotInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_REFERENCE_SLOT_INFO_KHR,
    .pNext = &encodeH265DpbSlotInfo,
    .slotIndex = ... // DPB slot index of the backward reference picture
    ...
};

StdVideoEncodeH265ReferenceListsInfo stdRefListInfo = {};
// Initialize the RefPicLists and add the backward reference to the L0 list
for (uint32_t i = 0; i < STD_VIDEO_H265_MAX_NUM_LIST_REF; ++i) {
    stdRefListInfo.RefPicList0[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
    stdRefListInfo.RefPicList1[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
}
stdRefListInfo.RefPicList0[0] = ... // DPB slot index of the backward reference picture
// Populate other H.265 reference list parameters
...

StdVideoEncodeH265PictureInfo stdPictureInfo = {};
// Populate H.265 picture info for the encode input picture
...
stdPictureInfo.pic_type = STD_VIDEO_H265_PICTURE_TYPE_P;
...
stdPictureInfo.pRefLists = &stdRefListInfo;
...

VkVideoEncodeH265PictureInfoKHR encodeH265PictureInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_PICTURE_INFO_KHR,
    .pNext = NULL,
    .naluSliceSegmentEntryCount = ... // number of slice segments to encode
    .pNaluSliceSegmentEntries = ... // pointer to the array of slice segment parameters
    .pStdPictureInfo = &stdPictureInfo
};

VkVideoEncodeInfoKHR encodeInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_INFO_KHR,
    .pNext = &encodeH265PictureInfo,
    ...
    .referenceSlotCount = 1,
    .pReferenceSlots = &referenceSlotInfo
};

vkCmdEncodeVideoKHR(commandBuffer, &encodeInfo);

vkCmdEndVideoCodingKHR(commandBuffer, ...);

// Bound reference resource list provided has to include the used reference picture resources
vkCmdBeginVideoCodingKHR(commandBuffer, ...);

StdVideoEncodeH265ReferenceInfo stdBackwardReferenceInfo = {};
// Populate H.265 reference picture info for the backward referenced picture
...

StdVideoEncodeH265ReferenceInfo stdForwardReferenceInfo = {};
// Populate H.265 reference picture info for the forward referenced picture
...

VkVideoEncodeH265DpbSlotInfoKHR encodeH265DpbSlotInfo[] = {
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_DPB_SLOT_INFO_KHR,
        .pNext = NULL,
        .pStdReferenceInfo = &stdBackwardReferenceInfo
    },
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_DPB_SLOT_INFO_KHR,
        .pNext = NULL,
        .pStdReferenceInfo = &stdForwardReferenceInfo
    }
};

VkVideoReferenceSlotInfoKHR referenceSlotInfo[] = {
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_REFERENCE_SLOT_INFO_KHR,
        .pNext = &encodeH265DpbSlotInfo[0],
        .slotIndex = ... // DPB slot index of the backward reference picture
        ...
    },
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_REFERENCE_SLOT_INFO_KHR,
        .pNext = &encodeH265DpbSlotInfo[1],
        .slotIndex = ... // DPB slot index of the forward reference picture
        ...
    }
};

StdVideoEncodeH265ReferenceListsInfo stdRefListInfo = {};
// Initialize the RefPicLists, add the backward reference to the L0 list,
// and add the forward reference to the L1 list
for (uint32_t i = 0; i < STD_VIDEO_H265_MAX_NUM_LIST_REF; ++i) {
    stdRefListInfo.RefPicList0[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
    stdRefListInfo.RefPicList1[i] = STD_VIDEO_H265_NO_REFERENCE_PICTURE;
}
stdRefListInfo.RefPicList0[0] = ... // DPB slot index of the backward reference picture
stdRefListInfo.RefPicList1[0] = ... // DPB slot index of the forward reference picture
// Populate other H.265 reference list parameters
...

StdVideoEncodeH265PictureInfo stdPictureInfo = {};
// Populate H.265 picture info for the encode input picture
...
stdPictureInfo.pic_type = STD_VIDEO_H265_PICTURE_TYPE_B;
...
stdPictureInfo.pRefLists = &stdRefListInfo;
...

VkVideoEncodeH265PictureInfoKHR encodeH265PictureInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_PICTURE_INFO_KHR,
    .pNext = NULL,
    .naluSliceSegmentEntryCount = ... // number of slice segments to encode
    .pNaluSliceSegmentEntries = ... // pointer to the array of slice segment parameters
    .pStdPictureInfo = &stdPictureInfo
};

VkVideoEncodeInfoKHR encodeInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_INFO_KHR,
    .pNext = &encodeH265PictureInfo,
    ...
    .referenceSlotCount = sizeof(referenceSlotInfo) / sizeof(referenceSlotInfo[0]),
    .pReferenceSlots = &referenceSlotInfo[0]
};

vkCmdEncodeVideoKHR(commandBuffer, &encodeInfo);

vkCmdEndVideoCodingKHR(commandBuffer, ...);

vkCmdBeginVideoCodingKHR(commandBuffer, ...);

// Include the optional H.265 rate control layer information
// In this example we restrict the QP range to be used by the implementation
VkVideoEncodeH265RateControlLayerInfoKHR rateControlLayersH265[] = {
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_RATE_CONTROL_LAYER_INFO_KHR,
        .pNext = NULL,
        .useMinQp = VK_TRUE,
        .minQp = { /* min I frame QP */, /* min P frame QP */, /* min B frame QP */ },
        .useMaxQp = VK_TRUE,
        .minQp = { /* max I frame QP */, /* max P frame QP */, /* max B frame QP */ },
        .useMaxFrameSize = VK_FALSE,
        .maxFrameSize = { 0, 0, 0 }
    },
    ...
};

VkVideoEncodeRateControlLayerInfoKHR rateControlLayers[] = {
    {
        .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_RATE_CONTROL_LAYER_INFO_KHR,
        .pNext = &rateControlLayersH265[0],
        ...
    },
    ...
};

// Include the optional H.265 global rate control information
VkVideoEncodeH265RateControlInfoKHR rateControlInfoH265 = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_H265_RATE_CONTROL_INFO_KHR,
    .pNext = NULL,
    .flags = VK_VIDEO_ENCODE_H265_RATE_CONTROL_REGULAR_GOP_BIT_KHR // Indicate the use of a regular GOP structure...
           | VK_VIDEO_ENCODE_H265_RATE_CONTROL_TEMPORAL_SUB_LAYER_PATTERN_DYADIC_BIT_KHR, // ... and a dyadic temporal sub-layer pattern
    // Indicate a GOP structure of the form IBBBPBBBPBBBI with an IDR frame at the beginning of every 10th GOP
    .gopFrameCount = 12,
    .idrPeriod = 120,
    .consecutiveBFrameCount = 3,
    // This example uses multiple temporal sub-layers with per layer rate control
    .subLayerCount = sizeof(rateControlLayers) / sizeof(rateControlLayers[0])
};

VkVideoEncodeRateControlInfoKHR rateControlInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_ENCODE_RATE_CONTROL_INFO_KHR,
    .pNext = &rateControlInfoH265,
    ...
    .layerCount = sizeof(rateControlLayers) / sizeof(rateControlLayers[0]),
    .pLayers = rateControlLayers,
    ...
};

// Change the rate control configuration for the video session
VkVideoCodingControlInfoKHR controlInfo = {
    .sType = VK_STRUCTURE_TYPE_VIDEO_CODING_CONTROL_INFO_KHR,
    .pNext = &rateControlInfo,
    .flags = VK_VIDEO_CODING_CONTROL_ENCODE_RATE_CONTROL_BIT_KHR
};

vkCmdControlVideoCodingKHR(commandBuffer, &controlInfo);

...

vkCmdEndVideoCodingKHR(commandBuffer, ...);