// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "precomp.hpp"

#if defined(HAVE_NVCUVENC)
#include "NvEncoder.h"

namespace cv { namespace cudacodec {

NvEncoder::NvEncoder(NV_ENC_DEVICE_TYPE eDeviceType, void* pDevice, uint32_t nWidth, uint32_t nHeight, NV_ENC_BUFFER_FORMAT eBufferFormat,
    uint32_t nExtraOutputDelay) :
    m_hEncoder(nullptr),
    m_pDevice(pDevice),
    m_eDeviceType(eDeviceType),
    m_nWidth(nWidth),
    m_nHeight(nHeight),
    m_nMaxEncodeWidth(nWidth),
    m_nMaxEncodeHeight(nHeight),
    m_eBufferFormat(eBufferFormat),
    m_nExtraOutputDelay(nExtraOutputDelay)
{
    LoadNvEncApi();

    if (!m_nvenc.nvEncOpenEncodeSession)
    {
        m_nEncoderBuffer = 0;
        NVENC_THROW_ERROR("EncodeAPI not found", NV_ENC_ERR_NO_ENCODE_DEVICE);
    }

    NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS encodeSessionExParams = {};
    encodeSessionExParams.version = NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER;
    encodeSessionExParams.device = m_pDevice;
    encodeSessionExParams.deviceType = m_eDeviceType;
    encodeSessionExParams.apiVersion = NVENCAPI_VERSION;
    void* hEncoder = NULL;
    NVENC_API_CALL(m_nvenc.nvEncOpenEncodeSessionEx(&encodeSessionExParams, &hEncoder));
    m_hEncoder = hEncoder;
}

void NvEncoder::LoadNvEncApi()
{

    uint32_t version = 0;
    uint32_t currentVersion = (NVENCAPI_MAJOR_VERSION << 4) | NVENCAPI_MINOR_VERSION;
    NVENC_API_CALL(NvEncodeAPIGetMaxSupportedVersion(&version));
    if (currentVersion > version)
    {
        NVENC_THROW_ERROR("Current Driver Version does not support this NvEncodeAPI version, please upgrade driver", NV_ENC_ERR_INVALID_VERSION);
    }

    m_nvenc = {};
    m_nvenc.version = NV_ENCODE_API_FUNCTION_LIST_VER;
    NVENC_API_CALL(NvEncodeAPICreateInstance(&m_nvenc));
}

NvEncoder::~NvEncoder()
{
    DestroyHWEncoder();
}

void NvEncoder::CreateDefaultEncoderParams(NV_ENC_INITIALIZE_PARAMS* pIntializeParams, GUID codecGuid, GUID presetGuid, NV_ENC_TUNING_INFO tuningInfo)
{
    if (!m_hEncoder)
    {
        NVENC_THROW_ERROR("Encoder Initialization failed", NV_ENC_ERR_NO_ENCODE_DEVICE);
        return;
    }

    if (pIntializeParams == nullptr || pIntializeParams->encodeConfig == nullptr)
    {
        NVENC_THROW_ERROR("pInitializeParams and pInitializeParams->encodeConfig can't be NULL", NV_ENC_ERR_INVALID_PTR);
    }

    memset(pIntializeParams->encodeConfig, 0, sizeof(NV_ENC_CONFIG));
    auto pEncodeConfig = pIntializeParams->encodeConfig;
    memset(pIntializeParams, 0, sizeof(NV_ENC_INITIALIZE_PARAMS));
    pIntializeParams->encodeConfig = pEncodeConfig;


    pIntializeParams->encodeConfig->version = NV_ENC_CONFIG_VER;
    pIntializeParams->version = NV_ENC_INITIALIZE_PARAMS_VER;

    pIntializeParams->encodeGUID = codecGuid;
    pIntializeParams->presetGUID = presetGuid;
    pIntializeParams->encodeWidth = m_nWidth;
    pIntializeParams->encodeHeight = m_nHeight;
    pIntializeParams->darWidth = m_nWidth;
    pIntializeParams->darHeight = m_nHeight;
    pIntializeParams->frameRateNum = 30;
    pIntializeParams->frameRateDen = 1;
    pIntializeParams->enablePTD = 1;
    pIntializeParams->reportSliceOffsets = 0;
    pIntializeParams->enableSubFrameWrite = 0;
    pIntializeParams->maxEncodeWidth = m_nWidth;
    pIntializeParams->maxEncodeHeight = m_nHeight;
    pIntializeParams->enableMEOnlyMode = false;
    pIntializeParams->enableOutputInVidmem = false;
#if defined(_WIN32)
    pIntializeParams->enableEncodeAsync = GetCapabilityValue(codecGuid, NV_ENC_CAPS_ASYNC_ENCODE_SUPPORT);
#endif
    pIntializeParams->tuningInfo = tuningInfo;
    pIntializeParams->encodeConfig->rcParams.rateControlMode = NV_ENC_PARAMS_RC_CONSTQP;
#if ((NVENCAPI_MAJOR_VERSION == 12 && NVENCAPI_MINOR_VERSION >= 2) || NVENCAPI_MAJOR_VERSION > 12)
    NV_ENC_PRESET_CONFIG presetConfig = { NV_ENC_PRESET_CONFIG_VER, 0, { NV_ENC_CONFIG_VER } };
#else
    NV_ENC_PRESET_CONFIG presetConfig = { NV_ENC_PRESET_CONFIG_VER, { NV_ENC_CONFIG_VER } };
#endif
    m_nvenc.nvEncGetEncodePresetConfigEx(m_hEncoder, codecGuid, presetGuid, tuningInfo, &presetConfig);
    memcpy(pIntializeParams->encodeConfig, &presetConfig.presetCfg, sizeof(NV_ENC_CONFIG));

    if (pIntializeParams->encodeGUID == NV_ENC_CODEC_H264_GUID)
    {
        if (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444 || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT)
        {
            pIntializeParams->encodeConfig->encodeCodecConfig.h264Config.chromaFormatIDC = 3;
        }
        pIntializeParams->encodeConfig->encodeCodecConfig.h264Config.idrPeriod = pIntializeParams->encodeConfig->gopLength;
    }
    else if (pIntializeParams->encodeGUID == NV_ENC_CODEC_HEVC_GUID)
    {
#if ((NVENCAPI_MAJOR_VERSION == 12 && NVENCAPI_MINOR_VERSION >= 2) || NVENCAPI_MAJOR_VERSION > 12)
        pIntializeParams->encodeConfig->encodeCodecConfig.hevcConfig.inputBitDepth = pIntializeParams->encodeConfig->encodeCodecConfig.hevcConfig.outputBitDepth =
            (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV420_10BIT || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT) ? NV_ENC_BIT_DEPTH_10 : NV_ENC_BIT_DEPTH_8;
#else
        pIntializeParams->encodeConfig->encodeCodecConfig.hevcConfig.pixelBitDepthMinus8 =
            (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV420_10BIT || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT) ? 2 : 0;
#endif
        if (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444 || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT)
        {
            pIntializeParams->encodeConfig->encodeCodecConfig.hevcConfig.chromaFormatIDC = 3;
        }
        pIntializeParams->encodeConfig->encodeCodecConfig.hevcConfig.idrPeriod = pIntializeParams->encodeConfig->gopLength;
    }

    return;
}

void NvEncoder::CreateEncoder(const NV_ENC_INITIALIZE_PARAMS* pEncoderParams)
{
    if (!m_hEncoder)
    {
        NVENC_THROW_ERROR("Encoder Initialization failed", NV_ENC_ERR_NO_ENCODE_DEVICE);
    }

    if (!pEncoderParams)
    {
        NVENC_THROW_ERROR("Invalid NV_ENC_INITIALIZE_PARAMS ptr", NV_ENC_ERR_INVALID_PTR);
    }

    if (pEncoderParams->encodeWidth == 0 || pEncoderParams->encodeHeight == 0)
    {
        NVENC_THROW_ERROR("Invalid encoder width and height", NV_ENC_ERR_INVALID_PARAM);
    }

    if (pEncoderParams->encodeGUID != NV_ENC_CODEC_H264_GUID && pEncoderParams->encodeGUID != NV_ENC_CODEC_HEVC_GUID)
    {
        NVENC_THROW_ERROR("Invalid codec guid", NV_ENC_ERR_INVALID_PARAM);
    }

    if (pEncoderParams->encodeGUID == NV_ENC_CODEC_H264_GUID)
    {
        if (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV420_10BIT || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT)
        {
            NVENC_THROW_ERROR("10-bit format isn't supported by H264 encoder", NV_ENC_ERR_INVALID_PARAM);
        }
    }

    // set other necessary params if not set yet
    if (pEncoderParams->encodeGUID == NV_ENC_CODEC_H264_GUID)
    {
        if ((m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444) &&
            (pEncoderParams->encodeConfig->encodeCodecConfig.h264Config.chromaFormatIDC != 3))
        {
            NVENC_THROW_ERROR("Invalid ChromaFormatIDC", NV_ENC_ERR_INVALID_PARAM);
        }
    }

    if (pEncoderParams->encodeGUID == NV_ENC_CODEC_HEVC_GUID)
    {
        bool yuv10BitFormat = (m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV420_10BIT || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT) ? true : false;
#if ((NVENCAPI_MAJOR_VERSION == 12 && NVENCAPI_MINOR_VERSION >= 2) || NVENCAPI_MAJOR_VERSION > 12)
        if (yuv10BitFormat && pEncoderParams->encodeConfig->encodeCodecConfig.hevcConfig.inputBitDepth != NV_ENC_BIT_DEPTH_10)
#else
        if (yuv10BitFormat && pEncoderParams->encodeConfig->encodeCodecConfig.hevcConfig.pixelBitDepthMinus8 != 2)
#endif
        {
            NVENC_THROW_ERROR("Invalid PixelBitdepth", NV_ENC_ERR_INVALID_PARAM);
        }

        if ((m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444 || m_eBufferFormat == NV_ENC_BUFFER_FORMAT_YUV444_10BIT) &&
            (pEncoderParams->encodeConfig->encodeCodecConfig.hevcConfig.chromaFormatIDC != 3))
        {
            NVENC_THROW_ERROR("Invalid ChromaFormatIDC", NV_ENC_ERR_INVALID_PARAM);
        }
    }

    memcpy(&m_initializeParams, pEncoderParams, sizeof(m_initializeParams));
    m_initializeParams.version = NV_ENC_INITIALIZE_PARAMS_VER;

    if (pEncoderParams->encodeConfig)
    {
        memcpy(&m_encodeConfig, pEncoderParams->encodeConfig, sizeof(m_encodeConfig));
        m_encodeConfig.version = NV_ENC_CONFIG_VER;
    }
    else
    {
#if ((NVENCAPI_MAJOR_VERSION == 12 && NVENCAPI_MINOR_VERSION >= 2) || NVENCAPI_MAJOR_VERSION > 12)
        NV_ENC_PRESET_CONFIG presetConfig = { NV_ENC_PRESET_CONFIG_VER, 0, { NV_ENC_CONFIG_VER } };
#else
        NV_ENC_PRESET_CONFIG presetConfig = { NV_ENC_PRESET_CONFIG_VER, { NV_ENC_CONFIG_VER } };
#endif
        m_nvenc.nvEncGetEncodePresetConfigEx(m_hEncoder, pEncoderParams->encodeGUID, pEncoderParams->presetGUID, pEncoderParams->tuningInfo, &presetConfig);
        memcpy(&m_encodeConfig, &presetConfig.presetCfg, sizeof(NV_ENC_CONFIG));
    }

    if (((uint32_t)m_encodeConfig.frameIntervalP) > m_encodeConfig.gopLength)
    {
        m_encodeConfig.frameIntervalP = m_encodeConfig.gopLength;
    }

    m_initializeParams.encodeConfig = &m_encodeConfig;
    NVENC_API_CALL(m_nvenc.nvEncInitializeEncoder(m_hEncoder, &m_initializeParams));
    m_bEncoderInitialized = true;
    m_nWidth = m_initializeParams.encodeWidth;
    m_nHeight = m_initializeParams.encodeHeight;
    m_nMaxEncodeWidth = m_initializeParams.maxEncodeWidth;
    m_nMaxEncodeHeight = m_initializeParams.maxEncodeHeight;

    m_nEncoderBuffer = m_encodeConfig.frameIntervalP + m_encodeConfig.rcParams.lookaheadDepth + m_nExtraOutputDelay;
    m_nOutputDelay = m_nEncoderBuffer - 1;

    m_vpCompletionEvent.resize(m_nEncoderBuffer, nullptr);

#if defined(_WIN32)
    for (uint32_t i = 0; i < m_vpCompletionEvent.size(); i++)
    {
        m_vpCompletionEvent[i] = CreateEvent(NULL, FALSE, FALSE, NULL);
        NV_ENC_EVENT_PARAMS eventParams = { NV_ENC_EVENT_PARAMS_VER };
        eventParams.completionEvent = m_vpCompletionEvent[i];
        m_nvenc.nvEncRegisterAsyncEvent(m_hEncoder, &eventParams);
    }
#endif

    m_vMappedInputBuffers.resize(m_nEncoderBuffer, nullptr);
    m_vBitstreamOutputBuffer.resize(m_nEncoderBuffer, nullptr);
    InitializeBitstreamBuffer();
    AllocateInputBuffers(m_nEncoderBuffer);
}

void NvEncoder::DestroyEncoder()
{
    if (!m_hEncoder)
    {
        return;
    }

    ReleaseInputBuffers();

    DestroyHWEncoder();
}

void NvEncoder::DestroyHWEncoder()
{
    if (!m_hEncoder)
    {
        return;
    }

#if defined(_WIN32)
    for (uint32_t i = 0; i < m_vpCompletionEvent.size(); i++)
    {
        if (m_vpCompletionEvent[i])
        {
            NV_ENC_EVENT_PARAMS eventParams = { NV_ENC_EVENT_PARAMS_VER };
            eventParams.completionEvent = m_vpCompletionEvent[i];
            m_nvenc.nvEncUnregisterAsyncEvent(m_hEncoder, &eventParams);
            CloseHandle(m_vpCompletionEvent[i]);
        }
    }
    m_vpCompletionEvent.clear();
#endif

    DestroyBitstreamBuffer();

    m_nvenc.nvEncDestroyEncoder(m_hEncoder);

    m_hEncoder = nullptr;

    m_bEncoderInitialized = false;
}

const NvEncInputFrame* NvEncoder::GetNextInputFrame()
{
    int i = m_iToSend % m_nEncoderBuffer;
    return &m_vInputFrames[i];
}

void NvEncoder::MapResources(uint32_t bfrIdx)
{
    NV_ENC_MAP_INPUT_RESOURCE mapInputResource = {};
    mapInputResource.version = NV_ENC_MAP_INPUT_RESOURCE_VER;
    mapInputResource.registeredResource = m_vRegisteredResources[bfrIdx];
    NVENC_API_CALL(m_nvenc.nvEncMapInputResource(m_hEncoder, &mapInputResource));
    m_vMappedInputBuffers[bfrIdx] = mapInputResource.mappedResource;
}

void NvEncoder::EncodeFrame(std::vector<std::vector<uint8_t>>& vPacket, std::vector<uint64_t>& outputTimeStamps, NV_ENC_PIC_PARAMS* pPicParams)
{
    vPacket.clear();
    outputTimeStamps.clear();
    if (!IsHWEncoderInitialized())
    {
        NVENC_THROW_ERROR("Encoder device not found", NV_ENC_ERR_NO_ENCODE_DEVICE);
    }

    int bfrIdx = m_iToSend % m_nEncoderBuffer;

    MapResources(bfrIdx);

    NVENCSTATUS nvStatus = DoEncode(m_vMappedInputBuffers[bfrIdx], m_vBitstreamOutputBuffer[bfrIdx], pPicParams);

    if (nvStatus == NV_ENC_SUCCESS || nvStatus == NV_ENC_ERR_NEED_MORE_INPUT)
    {
        m_iToSend++;
        GetEncodedPacket(m_vBitstreamOutputBuffer, vPacket, outputTimeStamps, true);
    }
    else
    {
        NVENC_THROW_ERROR("nvEncEncodePicture API failed", nvStatus);
    }
}

void NvEncoder::GetSequenceParams(std::vector<uint8_t>& seqParams)
{
    uint8_t spsppsData[1024]; // Assume maximum spspps data is 1KB or less
    memset(spsppsData, 0, sizeof(spsppsData));
    NV_ENC_SEQUENCE_PARAM_PAYLOAD payload = {};
    payload.version = NV_ENC_SEQUENCE_PARAM_PAYLOAD_VER;
    uint32_t spsppsSize = 0;

    payload.spsppsBuffer = spsppsData;
    payload.inBufferSize = sizeof(spsppsData);
    payload.outSPSPPSPayloadSize = &spsppsSize;
    NVENC_API_CALL(m_nvenc.nvEncGetSequenceParams(m_hEncoder, &payload));
    seqParams.clear();
    seqParams.insert(seqParams.end(), &spsppsData[0], &spsppsData[spsppsSize]);
}

NVENCSTATUS NvEncoder::DoEncode(NV_ENC_INPUT_PTR inputBuffer, NV_ENC_OUTPUT_PTR outputBuffer, NV_ENC_PIC_PARAMS* pPicParams)
{
    NV_ENC_PIC_PARAMS picParams = {};
    if (pPicParams)
    {
        picParams = *pPicParams;
    }
    picParams.inputTimeStamp = m_iInputFrame++;
    picParams.version = NV_ENC_PIC_PARAMS_VER;
    picParams.pictureStruct = NV_ENC_PIC_STRUCT_FRAME;
    picParams.inputBuffer = inputBuffer;
    picParams.bufferFmt = GetPixelFormat();
    picParams.inputWidth = GetEncodeWidth();
    picParams.inputHeight = GetEncodeHeight();
    picParams.outputBitstream = outputBuffer;
    picParams.completionEvent = GetCompletionEvent(m_iToSend % m_nEncoderBuffer);
    NVENCSTATUS nvStatus = m_nvenc.nvEncEncodePicture(m_hEncoder, &picParams);

    return nvStatus;
}

void NvEncoder::SendEOS()
{
    NV_ENC_PIC_PARAMS picParams = {};
    picParams.version = NV_ENC_PIC_PARAMS_VER;

    picParams.encodePicFlags = NV_ENC_PIC_FLAG_EOS;
    picParams.completionEvent = GetCompletionEvent(m_iToSend % m_nEncoderBuffer);
    NVENC_API_CALL(m_nvenc.nvEncEncodePicture(m_hEncoder, &picParams));
}

void NvEncoder::EndEncode(std::vector<std::vector<uint8_t>>& vPacket, std::vector<uint64_t>& outputTimeStamps)
{
    vPacket.clear();
    if (!IsHWEncoderInitialized())
    {
        NVENC_THROW_ERROR("Encoder device not initialized", NV_ENC_ERR_ENCODER_NOT_INITIALIZED);
    }

    SendEOS();

    GetEncodedPacket(m_vBitstreamOutputBuffer, vPacket, outputTimeStamps, false);
}

void NvEncoder::GetEncodedPacket(std::vector<NV_ENC_OUTPUT_PTR>& vOutputBuffer, std::vector<std::vector<uint8_t>>& vPacket, std::vector<uint64_t>& outputTimeStamps, bool bOutputDelay)
{
    unsigned i = 0;
    int iEnd = bOutputDelay ? m_iToSend - m_nOutputDelay : m_iToSend;
    for (; m_iGot < iEnd; m_iGot++)
    {
        WaitForCompletionEvent(m_iGot % m_nEncoderBuffer);
        NV_ENC_LOCK_BITSTREAM lockBitstreamData = {};
        lockBitstreamData.version = NV_ENC_LOCK_BITSTREAM_VER;
        lockBitstreamData.outputBitstream = vOutputBuffer[m_iGot % m_nEncoderBuffer];
        lockBitstreamData.doNotWait = false;
        NVENC_API_CALL(m_nvenc.nvEncLockBitstream(m_hEncoder, &lockBitstreamData));

        outputTimeStamps.push_back(lockBitstreamData.outputTimeStamp);
        uint8_t* pData = (uint8_t*)lockBitstreamData.bitstreamBufferPtr;
        if (vPacket.size() < i + 1)
        {
            vPacket.push_back(std::vector<uint8_t>());
        }
        vPacket[i].clear();
        vPacket[i].insert(vPacket[i].end(), &pData[0], &pData[lockBitstreamData.bitstreamSizeInBytes]);
        i++;

        NVENC_API_CALL(m_nvenc.nvEncUnlockBitstream(m_hEncoder, lockBitstreamData.outputBitstream));

        if (m_vMappedInputBuffers[m_iGot % m_nEncoderBuffer])
        {
            NVENC_API_CALL(m_nvenc.nvEncUnmapInputResource(m_hEncoder, m_vMappedInputBuffers[m_iGot % m_nEncoderBuffer]));
            m_vMappedInputBuffers[m_iGot % m_nEncoderBuffer] = nullptr;
        }
    }
}

bool NvEncoder::Reconfigure(const NV_ENC_RECONFIGURE_PARAMS* pReconfigureParams)
{
    NVENC_API_CALL(m_nvenc.nvEncReconfigureEncoder(m_hEncoder, const_cast<NV_ENC_RECONFIGURE_PARAMS*>(pReconfigureParams)));

    memcpy(&m_initializeParams, &(pReconfigureParams->reInitEncodeParams), sizeof(m_initializeParams));
    if (pReconfigureParams->reInitEncodeParams.encodeConfig)
    {
        memcpy(&m_encodeConfig, pReconfigureParams->reInitEncodeParams.encodeConfig, sizeof(m_encodeConfig));
    }

    m_nWidth = m_initializeParams.encodeWidth;
    m_nHeight = m_initializeParams.encodeHeight;
    m_nMaxEncodeWidth = m_initializeParams.maxEncodeWidth;
    m_nMaxEncodeHeight = m_initializeParams.maxEncodeHeight;

    return true;
}

NV_ENC_REGISTERED_PTR NvEncoder::RegisterResource(void* pBuffer, NV_ENC_INPUT_RESOURCE_TYPE eResourceType,
    int width, int height, int pitch, NV_ENC_BUFFER_FORMAT bufferFormat, NV_ENC_BUFFER_USAGE bufferUsage,
    NV_ENC_FENCE_POINT_D3D12* pInputFencePoint)
{
    NV_ENC_REGISTER_RESOURCE registerResource = {};
    registerResource.version = NV_ENC_REGISTER_RESOURCE_VER;
    registerResource.resourceType = eResourceType;
    registerResource.resourceToRegister = pBuffer;
    registerResource.width = width;
    registerResource.height = height;
    registerResource.pitch = pitch;
    registerResource.bufferFormat = bufferFormat;
    registerResource.bufferUsage = bufferUsage;
    registerResource.pInputFencePoint = pInputFencePoint;
    NVENC_API_CALL(m_nvenc.nvEncRegisterResource(m_hEncoder, &registerResource));

    return registerResource.registeredResource;
}

void NvEncoder::RegisterInputResources(std::vector<void*> inputframes, NV_ENC_INPUT_RESOURCE_TYPE eResourceType,
    int width, int height, int pitch, NV_ENC_BUFFER_FORMAT bufferFormat, bool bReferenceFrame)
{
    for (uint32_t i = 0; i < inputframes.size(); ++i)
    {
        NV_ENC_REGISTERED_PTR registeredPtr = RegisterResource(inputframes[i], eResourceType, width, height, pitch, bufferFormat, NV_ENC_INPUT_IMAGE);

        std::vector<uint32_t> _chromaOffsets;
        NvEncoder::GetChromaSubPlaneOffsets(bufferFormat, pitch, height, _chromaOffsets);
        NvEncInputFrame inputframe = {};
        inputframe.inputPtr = (void*)inputframes[i];
        inputframe.chromaOffsets[0] = 0;
        inputframe.chromaOffsets[1] = 0;
        for (uint32_t ch = 0; ch < _chromaOffsets.size(); ch++)
        {
            inputframe.chromaOffsets[ch] = _chromaOffsets[ch];
        }
        inputframe.numChromaPlanes = NvEncoder::GetNumChromaPlanes(bufferFormat);
        inputframe.pitch = pitch;
        inputframe.chromaPitch = NvEncoder::GetChromaPitch(bufferFormat, pitch);
        inputframe.bufferFormat = bufferFormat;
        inputframe.resourceType = eResourceType;

        if (bReferenceFrame)
        {
            m_vRegisteredResourcesForReference.push_back(registeredPtr);
            m_vReferenceFrames.push_back(inputframe);
        }
        else
        {
            m_vRegisteredResources.push_back(registeredPtr);
            m_vInputFrames.push_back(inputframe);
        }
    }
}

void NvEncoder::FlushEncoder()
{
    try
    {
        std::vector<std::vector<uint8_t>> vPacket;
        std::vector<uint64_t> outputTimeStamps;
        EndEncode(vPacket, outputTimeStamps);
    }
    catch (...)
    {

    }
}

void NvEncoder::UnregisterInputResources()
{
    FlushEncoder();

    m_vMappedRefBuffers.clear();

    for (uint32_t i = 0; i < m_vMappedInputBuffers.size(); ++i)
    {
        if (m_vMappedInputBuffers[i])
        {
            m_nvenc.nvEncUnmapInputResource(m_hEncoder, m_vMappedInputBuffers[i]);
        }
    }
    m_vMappedInputBuffers.clear();

    for (uint32_t i = 0; i < m_vRegisteredResources.size(); ++i)
    {
        if (m_vRegisteredResources[i])
        {
            m_nvenc.nvEncUnregisterResource(m_hEncoder, m_vRegisteredResources[i]);
        }
    }
    m_vRegisteredResources.clear();


    for (uint32_t i = 0; i < m_vRegisteredResourcesForReference.size(); ++i)
    {
        if (m_vRegisteredResourcesForReference[i])
        {
            m_nvenc.nvEncUnregisterResource(m_hEncoder, m_vRegisteredResourcesForReference[i]);
        }
    }
    m_vRegisteredResourcesForReference.clear();

}


void NvEncoder::WaitForCompletionEvent(int iEvent)
{
#if defined(_WIN32)
    // Check if we are in async mode. If not, don't wait for event;
    NV_ENC_CONFIG sEncodeConfig = { 0 };
    NV_ENC_INITIALIZE_PARAMS sInitializeParams = { 0 };
    sInitializeParams.encodeConfig = &sEncodeConfig;
    GetInitializeParams(&sInitializeParams);

    if (0U == sInitializeParams.enableEncodeAsync)
    {
        return;
    }
#ifdef DEBUG
    WaitForSingleObject(m_vpCompletionEvent[iEvent], INFINITE);
#else
    // wait for 20s which is infinite on terms of gpu time
    if (WaitForSingleObject(m_vpCompletionEvent[iEvent], 20000) == WAIT_FAILED)
    {
        NVENC_THROW_ERROR("Failed to encode frame", NV_ENC_ERR_GENERIC);
    }
#endif
#endif
}

uint32_t NvEncoder::GetWidthInBytes(const NV_ENC_BUFFER_FORMAT bufferFormat, const uint32_t width)
{
    switch (bufferFormat) {
    case NV_ENC_BUFFER_FORMAT_NV12:
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
    case NV_ENC_BUFFER_FORMAT_YUV444:
        return width;
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return width * 2;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return width * 4;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

uint32_t NvEncoder::GetNumChromaPlanes(const NV_ENC_BUFFER_FORMAT bufferFormat)
{
    switch (bufferFormat)
    {
    case NV_ENC_BUFFER_FORMAT_NV12:
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
        return 1;
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
    case NV_ENC_BUFFER_FORMAT_YUV444:
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return 2;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return 0;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

uint32_t NvEncoder::GetChromaPitch(const NV_ENC_BUFFER_FORMAT bufferFormat, const uint32_t lumaPitch)
{
    switch (bufferFormat)
    {
    case NV_ENC_BUFFER_FORMAT_NV12:
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
    case NV_ENC_BUFFER_FORMAT_YUV444:
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return lumaPitch;
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
        return (lumaPitch + 1) / 2;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return 0;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

void NvEncoder::GetChromaSubPlaneOffsets(const NV_ENC_BUFFER_FORMAT bufferFormat, const uint32_t pitch, const uint32_t height, std::vector<uint32_t>& chromaOffsets)
{
    chromaOffsets.clear();
    switch (bufferFormat)
    {
    case NV_ENC_BUFFER_FORMAT_NV12:
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
        chromaOffsets.push_back(pitch * height);
        return;
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
        chromaOffsets.push_back(pitch * height);
        chromaOffsets.push_back(chromaOffsets[0] + (NvEncoder::GetChromaPitch(bufferFormat, pitch) * GetChromaHeight(bufferFormat, height)));
        return;
    case NV_ENC_BUFFER_FORMAT_YUV444:
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        chromaOffsets.push_back(pitch * height);
        chromaOffsets.push_back(chromaOffsets[0] + (pitch * height));
        return;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

uint32_t NvEncoder::GetChromaHeight(const NV_ENC_BUFFER_FORMAT bufferFormat, const uint32_t lumaHeight)
{
    switch (bufferFormat)
    {
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
    case NV_ENC_BUFFER_FORMAT_NV12:
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
        return (lumaHeight + 1) / 2;
    case NV_ENC_BUFFER_FORMAT_YUV444:
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return lumaHeight;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return 0;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

uint32_t NvEncoder::GetChromaWidthInBytes(const NV_ENC_BUFFER_FORMAT bufferFormat, const uint32_t lumaWidth)
{
    switch (bufferFormat)
    {
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
        return (lumaWidth + 1) / 2;
    case NV_ENC_BUFFER_FORMAT_NV12:
        return lumaWidth;
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
        return 2 * lumaWidth;
    case NV_ENC_BUFFER_FORMAT_YUV444:
        return lumaWidth;
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return 2 * lumaWidth;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return 0;
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}


int NvEncoder::GetCapabilityValue(GUID guidCodec, NV_ENC_CAPS capsToQuery)
{
    if (!m_hEncoder)
    {
        return 0;
    }
    NV_ENC_CAPS_PARAM capsParam = {};
    capsParam.version = NV_ENC_CAPS_PARAM_VER;
    capsParam.capsToQuery = capsToQuery;
    int v;
    m_nvenc.nvEncGetEncodeCaps(m_hEncoder, guidCodec, &capsParam, &v);
    return v;
}

int NvEncoder::GetFrameSize() const
{
    switch (GetPixelFormat())
    {
    case NV_ENC_BUFFER_FORMAT_YV12:
    case NV_ENC_BUFFER_FORMAT_IYUV:
    case NV_ENC_BUFFER_FORMAT_NV12:
        return GetEncodeWidth() * (GetEncodeHeight() + (GetEncodeHeight() + 1) / 2);
    case NV_ENC_BUFFER_FORMAT_YUV420_10BIT:
        return 2 * GetEncodeWidth() * (GetEncodeHeight() + (GetEncodeHeight() + 1) / 2);
    case NV_ENC_BUFFER_FORMAT_YUV444:
        return GetEncodeWidth() * GetEncodeHeight() * 3;
    case NV_ENC_BUFFER_FORMAT_YUV444_10BIT:
        return 2 * GetEncodeWidth() * GetEncodeHeight() * 3;
    case NV_ENC_BUFFER_FORMAT_ARGB:
    case NV_ENC_BUFFER_FORMAT_ARGB10:
    case NV_ENC_BUFFER_FORMAT_AYUV:
    case NV_ENC_BUFFER_FORMAT_ABGR:
    case NV_ENC_BUFFER_FORMAT_ABGR10:
        return 4 * GetEncodeWidth() * GetEncodeHeight();
    default:
        NVENC_THROW_ERROR("Invalid Buffer format", NV_ENC_ERR_INVALID_PARAM);
    }
}

void NvEncoder::GetInitializeParams(NV_ENC_INITIALIZE_PARAMS* pInitializeParams)
{
    if (!pInitializeParams || !pInitializeParams->encodeConfig)
    {
        NVENC_THROW_ERROR("Both pInitializeParams and pInitializeParams->encodeConfig can't be NULL", NV_ENC_ERR_INVALID_PTR);
    }
    NV_ENC_CONFIG* pEncodeConfig = pInitializeParams->encodeConfig;
    *pEncodeConfig = m_encodeConfig;
    *pInitializeParams = m_initializeParams;
    pInitializeParams->encodeConfig = pEncodeConfig;
}

void NvEncoder::InitializeBitstreamBuffer()
{
    for (int i = 0; i < m_nEncoderBuffer; i++)
    {
        NV_ENC_CREATE_BITSTREAM_BUFFER createBitstreamBuffer = {};
        createBitstreamBuffer.version = NV_ENC_CREATE_BITSTREAM_BUFFER_VER;
        NVENC_API_CALL(m_nvenc.nvEncCreateBitstreamBuffer(m_hEncoder, &createBitstreamBuffer));
        m_vBitstreamOutputBuffer[i] = createBitstreamBuffer.bitstreamBuffer;
    }
}

void NvEncoder::DestroyBitstreamBuffer()
{
    for (uint32_t i = 0; i < m_vBitstreamOutputBuffer.size(); i++)
    {
        if (m_vBitstreamOutputBuffer[i])
        {
            m_nvenc.nvEncDestroyBitstreamBuffer(m_hEncoder, m_vBitstreamOutputBuffer[i]);
        }
    }

    m_vBitstreamOutputBuffer.clear();
}
}}
#endif