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#include "test_precomp.hpp"
namespace opencv_test {
    namespace {

#if defined(HAVE_NVCUVID) || defined(HAVE_NVCUVENC)
PARAM_TEST_CASE(CheckSet, cv::cuda::DeviceInfo, std::string)
{
};

typedef tuple<std::string, int> check_extra_data_params_t;
PARAM_TEST_CASE(CheckExtraData, cv::cuda::DeviceInfo, check_extra_data_params_t)
{
};

PARAM_TEST_CASE(Scaling, cv::cuda::DeviceInfo, std::string, Size2f, Rect2f, Rect2f)
{
};

struct DisplayResolution : testing::TestWithParam<cv::cuda::DeviceInfo>
{
};

PARAM_TEST_CASE(Video, cv::cuda::DeviceInfo, std::string)
{
};

typedef tuple<std::string, bool> color_conversion_params_t;
PARAM_TEST_CASE(ColorConversion, cv::cuda::DeviceInfo, cv::cudacodec::ColorFormat, color_conversion_params_t)
{
};

PARAM_TEST_CASE(VideoReadRaw, cv::cuda::DeviceInfo, std::string)
{
};

PARAM_TEST_CASE(CheckKeyFrame, cv::cuda::DeviceInfo, std::string)
{
};

PARAM_TEST_CASE(CheckDecodeSurfaces, cv::cuda::DeviceInfo, std::string)
{
};

PARAM_TEST_CASE(CheckInitParams, cv::cuda::DeviceInfo, std::string, bool, bool, bool)
{
};

struct CheckParams : testing::TestWithParam<cv::cuda::DeviceInfo>
{
    cv::cuda::DeviceInfo devInfo;

    virtual void SetUp()
    {
        devInfo = GetParam();

        cv::cuda::setDevice(devInfo.deviceID());
    }
};

#if defined(HAVE_NVCUVID)
//////////////////////////////////////////////////////
// VideoReader

//==========================================================================

CUDA_TEST_P(CheckSet, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());

    if (!videoio_registry::hasBackend(CAP_FFMPEG))
        throw SkipTestException("FFmpeg backend was not found");

    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + +"../" + GET_PARAM(1);
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
    double unsupportedVal = -1;
    ASSERT_FALSE(reader->get(cv::cudacodec::VideoReaderProps::PROP_NOT_SUPPORTED, unsupportedVal));
    double rawModeVal = -1;
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_RAW_MODE, rawModeVal));
    ASSERT_FALSE(rawModeVal);
    ASSERT_TRUE(reader->set(cv::cudacodec::VideoReaderProps::PROP_RAW_MODE,true));
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_RAW_MODE, rawModeVal));
    ASSERT_TRUE(rawModeVal);
    bool rawPacketsAvailable = false;
    while (reader->grab()) {
        double nRawPackages = -1;
        ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_NUMBER_OF_RAW_PACKAGES_SINCE_LAST_GRAB, nRawPackages));
        if (nRawPackages > 0) {
            rawPacketsAvailable = true;
            break;
        }
    }
    ASSERT_TRUE(rawPacketsAvailable);
}

CUDA_TEST_P(CheckExtraData, Reader)
{
    // RTSP streaming is only supported by the FFmpeg back end
    if (!videoio_registry::hasBackend(CAP_FFMPEG))
        throw SkipTestException("FFmpeg backend not found");

    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    const string path = get<0>(GET_PARAM(1));
    const int sz = get<1>(GET_PARAM(1));
    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + path;
    cv::cudacodec::VideoReaderInitParams params;
    params.rawMode = true;
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
    double extraDataIdx = -1;
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_EXTRA_DATA_INDEX, extraDataIdx));
    ASSERT_EQ(extraDataIdx, 1 );
    ASSERT_TRUE(reader->grab());
    cv::Mat extraData;
    const bool newData = reader->retrieve(extraData, static_cast<size_t>(extraDataIdx));
    ASSERT_TRUE((newData && sz) || (!newData && !sz));
    ASSERT_EQ(extraData.total(), sz);
}

CUDA_TEST_P(CheckKeyFrame, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());

    // RTSP streaming is only supported by the FFmpeg back end
    if (!videoio_registry::hasBackend(CAP_FFMPEG))
        throw SkipTestException("FFmpeg backend not found");

    const string path = GET_PARAM(1);
    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + path;
    cv::cudacodec::VideoReaderInitParams params;
    params.rawMode = true;
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
    double rawIdxBase = -1;
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_RAW_PACKAGES_BASE_INDEX, rawIdxBase));
    ASSERT_EQ(rawIdxBase, 2);
    constexpr int maxNPackagesToCheck = 2;
    int nPackages = 0;
    while (nPackages < maxNPackagesToCheck) {
        ASSERT_TRUE(reader->grab());
        double N = -1;
        ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_NUMBER_OF_RAW_PACKAGES_SINCE_LAST_GRAB,N));
        for (int i = static_cast<int>(rawIdxBase); i < static_cast<int>(N + rawIdxBase); i++) {
            nPackages++;
            double containsKeyFrame = i;
            ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_LRF_HAS_KEY_FRAME, containsKeyFrame));
            ASSERT_TRUE((nPackages == 1 && containsKeyFrame) || (nPackages == 2 && !containsKeyFrame)) << "nPackage: " << i;
            if (nPackages >= maxNPackagesToCheck)
                break;
        }
    }
}

CUDA_TEST_P(Scaling, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + GET_PARAM(1);
    const Size2f targetSzIn = GET_PARAM(2);
    const Rect2f srcRoiIn = GET_PARAM(3);
    const Rect2f targetRoiIn = GET_PARAM(4);

    GpuMat frameOr;
    {
        cv::Ptr<cv::cudacodec::VideoReader> readerGs = cv::cudacodec::createVideoReader(inputFile);
        ASSERT_TRUE(readerGs->set(cudacodec::ColorFormat::GRAY));
        ASSERT_TRUE(readerGs->nextFrame(frameOr));
    }

    cudacodec::VideoReaderInitParams params;
    params.targetSz = Size(static_cast<int>(frameOr.cols * targetSzIn.width), static_cast<int>(frameOr.rows * targetSzIn.height));
    params.srcRoi = Rect(static_cast<int>(frameOr.cols * srcRoiIn.x), static_cast<int>(frameOr.rows * srcRoiIn.y), static_cast<int>(frameOr.cols * srcRoiIn.width),
        static_cast<int>(frameOr.rows * srcRoiIn.height));
    params.targetRoi = Rect(static_cast<int>(params.targetSz.width * targetRoiIn.x), static_cast<int>(params.targetSz.height * targetRoiIn.y),
        static_cast<int>(params.targetSz.width * targetRoiIn.width), static_cast<int>(params.targetSz.height * targetRoiIn.height));
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
    ASSERT_TRUE(reader->set(cudacodec::ColorFormat::GRAY));
    GpuMat frame;
    ASSERT_TRUE(reader->nextFrame(frame));
    const cudacodec::FormatInfo format = reader->format();
    Size targetSzOut;
    targetSzOut.width = params.targetSz.width - params.targetSz.width % 2; targetSzOut.height = params.targetSz.height - params.targetSz.height % 2;
    Rect srcRoiOut, targetRoiOut;
    srcRoiOut.x = params.srcRoi.x - params.srcRoi.x % 4; srcRoiOut.width = params.srcRoi.width - params.srcRoi.width % 4;
    srcRoiOut.y = params.srcRoi.y - params.srcRoi.y % 2; srcRoiOut.height = params.srcRoi.height - params.srcRoi.height % 2;
    targetRoiOut.x = params.targetRoi.x - params.targetRoi.x % 4; targetRoiOut.width = params.targetRoi.width - params.targetRoi.width % 4;
    targetRoiOut.y = params.targetRoi.y - params.targetRoi.y % 2; targetRoiOut.height = params.targetRoi.height - params.targetRoi.height % 2;
    ASSERT_TRUE(format.valid && format.targetSz == targetSzOut && format.srcRoi == srcRoiOut && format.targetRoi == targetRoiOut);
    ASSERT_TRUE(frame.size() == targetSzOut);
    GpuMat frameGs;
    cv::cuda::resize(frameOr(srcRoiOut), frameGs, targetRoiOut.size(), 0, 0, INTER_AREA);
    // assert on mean absolute error due to different resize algorithms
    const double mae = cv::cuda::norm(frameGs, frame(targetRoiOut), NORM_L1)/frameGs.size().area();
    ASSERT_LT(mae, 2.75);
}

CUDA_TEST_P(DisplayResolution, Reader)
{
    cv::cuda::setDevice(GetParam().deviceID());
    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../cv/video/1920x1080.avi";
    const Rect displayArea(0, 0, 1920, 1080);
    GpuMat frame;

    {
        // verify the output frame is the diplay size (1920x1080) and not the coded size (1920x1088)
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
        reader->set(cudacodec::ColorFormat::GRAY);
        ASSERT_TRUE(reader->nextFrame(frame));
        const cudacodec::FormatInfo format = reader->format();
        ASSERT_TRUE(format.displayArea == displayArea);
        ASSERT_TRUE(frame.size() == displayArea.size() && frame.size() == format.targetSz);
    }

    {
        // extra check to verify display frame has not been post-processed and is just a cropped version of the coded sized frame
        cudacodec::VideoReaderInitParams params;
        params.srcRoi = Rect(0, 0, 1920, 1088);
        cv::Ptr<cv::cudacodec::VideoReader> readerCodedSz = cv::cudacodec::createVideoReader(inputFile, {}, params);
        readerCodedSz->set(cudacodec::ColorFormat::GRAY);
        GpuMat frameCodedSz;
        ASSERT_TRUE(readerCodedSz->nextFrame(frameCodedSz));
        const cudacodec::FormatInfo formatCodedSz = readerCodedSz->format();
        const double err = cv::cuda::norm(frame, frameCodedSz(displayArea), NORM_INF);
        ASSERT_TRUE(err == 0);
    }
}

CUDA_TEST_P(Video, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());

    // CUDA demuxer has to fall back to ffmpeg to process "cv/video/768x576.avi"
    if (GET_PARAM(1) == "cv/video/768x576.avi" && !videoio_registry::hasBackend(CAP_FFMPEG))
        throw SkipTestException("FFmpeg backend not found");

#ifdef _WIN32  // handle old FFmpeg backend
    if (GET_PARAM(1) == "/cv/tracking/faceocc2/data/faceocc2.webm")
        throw SkipTestException("Feature not yet supported by Windows FFmpeg shared library!");
#endif

    const std::vector<std::pair< cudacodec::ColorFormat, int>> formatsToChannels = {
        {cudacodec::ColorFormat::GRAY,1},
        {cudacodec::ColorFormat::BGR,3},
        {cudacodec::ColorFormat::BGRA,4},
        {cudacodec::ColorFormat::NV_NV12,1}
    };

    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + GET_PARAM(1);
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
    ASSERT_FALSE(reader->set(cudacodec::ColorFormat::RGB));
    cv::cudacodec::FormatInfo fmt = reader->format();
    cv::cuda::GpuMat frame;
    for (int i = 0; i < 10; i++)
    {
        // request a different colour format for each frame
        const std::pair< cudacodec::ColorFormat, int>& formatToChannels = formatsToChannels[i % formatsToChannels.size()];
        ASSERT_TRUE(reader->set(formatToChannels.first));
        double colorFormat;
        ASSERT_TRUE(reader->get(cudacodec::VideoReaderProps::PROP_COLOR_FORMAT, colorFormat) && static_cast<cudacodec::ColorFormat>(colorFormat) == formatToChannels.first);
        ASSERT_TRUE(reader->nextFrame(frame));
        if(!fmt.valid)
            fmt = reader->format();
        const int height = formatToChannels.first == cudacodec::ColorFormat::NV_NV12 ? static_cast<int>(1.5 * fmt.height) : fmt.height;
        ASSERT_TRUE(frame.cols == fmt.width && frame.rows == height);
        ASSERT_FALSE(frame.empty());
        ASSERT_TRUE(frame.channels() == formatToChannels.second);
    }
}

CUDA_TEST_P(ColorConversion, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    const cv::cudacodec::ColorFormat colorFormat = GET_PARAM(1);
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + get<0>(GET_PARAM(2));
    const bool videoFullRangeFlag = get<1>(GET_PARAM(2));
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
    reader->set(colorFormat);
    cv::VideoCapture cap(inputFile);

    cv::cuda::GpuMat frame;
    Mat frameHost, frameHostGs, frameFromDevice;
    for (int i = 0; i < 10; i++)
    {
        reader->nextFrame(frame);
        frame.download(frameFromDevice);
        cap.read(frameHost);
        const cv::cudacodec::FormatInfo fmt = reader->format();
        ASSERT_TRUE(fmt.valid && fmt.videoFullRangeFlag == videoFullRangeFlag);
        if (colorFormat == cv::cudacodec::ColorFormat::BGRA)
            cv::cvtColor(frameHost, frameHostGs, COLOR_BGR2BGRA);
        else
            frameHostGs = frameHost;
        EXPECT_MAT_NEAR(frameHostGs, frameFromDevice, 2.0);
    }
}

CUDA_TEST_P(VideoReadRaw, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());

    // RTSP streaming is only supported by the FFmpeg back end
    if (!videoio_registry::hasBackend(CAP_FFMPEG))
        throw SkipTestException("FFmpeg backend not found");

    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + GET_PARAM(1);
    const string fileNameOut = tempfile("test_container_stream");
    {
        std::ofstream file(fileNameOut, std::ios::binary);
        ASSERT_TRUE(file.is_open());
        cv::cudacodec::VideoReaderInitParams params;
        params.rawMode = true;
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
        double rawIdxBase = -1;
        ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_RAW_PACKAGES_BASE_INDEX, rawIdxBase));
        ASSERT_EQ(rawIdxBase, 2);
        cv::cuda::GpuMat frame;
        for (int i = 0; i < 100; i++)
        {
            ASSERT_TRUE(reader->grab());
            ASSERT_TRUE(reader->retrieve(frame));
            ASSERT_FALSE(frame.empty());
            double N = -1;
            ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_NUMBER_OF_RAW_PACKAGES_SINCE_LAST_GRAB,N));
            ASSERT_TRUE(N >= 0) << N << " < 0";
            for (int j = static_cast<int>(rawIdxBase); j <= static_cast<int>(N + rawIdxBase); j++) {
                Mat rawPackets;
                reader->retrieve(rawPackets, j);
                file.write((char*)rawPackets.data, rawPackets.total());
            }
        }
    }

    std::cout << "Checking written video stream: " << fileNameOut << std::endl;

    {
        cv::Ptr<cv::cudacodec::VideoReader> readerReference = cv::cudacodec::createVideoReader(inputFile);
        cv::cudacodec::VideoReaderInitParams params;
        params.rawMode = true;
        cv::Ptr<cv::cudacodec::VideoReader> readerActual = cv::cudacodec::createVideoReader(fileNameOut, {}, params);
        double decodedFrameIdx = -1;
        ASSERT_TRUE(readerActual->get(cv::cudacodec::VideoReaderProps::PROP_DECODED_FRAME_IDX, decodedFrameIdx));
        ASSERT_EQ(decodedFrameIdx, 0);
        cv::cuda::GpuMat reference, actual;
        cv::Mat referenceHost, actualHost;
        for (int i = 0; i < 100; i++)
        {
            ASSERT_TRUE(readerReference->nextFrame(reference));
            ASSERT_TRUE(readerActual->grab());
            ASSERT_TRUE(readerActual->retrieve(actual, static_cast<size_t>(decodedFrameIdx)));
            actual.download(actualHost);
            reference.download(referenceHost);
            ASSERT_TRUE(cvtest::norm(actualHost, referenceHost, NORM_INF) == 0);
        }
    }

    ASSERT_EQ(0, remove(fileNameOut.c_str()));
}

CUDA_TEST_P(CheckParams, Reader)
{
    std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../highgui/video/big_buck_bunny.mp4";
    {
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
        double msActual = -1;
        ASSERT_FALSE(reader->get(cv::VideoCaptureProperties::CAP_PROP_OPEN_TIMEOUT_MSEC, msActual));
    }

    {
        constexpr int msReference = 3333;
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {
            cv::VideoCaptureProperties::CAP_PROP_OPEN_TIMEOUT_MSEC, msReference });
        double msActual = -1;
        ASSERT_TRUE(reader->get(cv::VideoCaptureProperties::CAP_PROP_OPEN_TIMEOUT_MSEC, msActual));
        ASSERT_EQ(msActual, msReference);
    }

    {
        std::vector<bool> exceptionsThrown = { false,true };
        std::vector<int> capPropFormats = { -1,0 };
        for (int i = 0; i < capPropFormats.size(); i++) {
            bool exceptionThrown = false;
            try {
                cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {
                    cv::VideoCaptureProperties::CAP_PROP_FORMAT, capPropFormats.at(i) });
            }
            catch (cv::Exception &ex) {
                if (ex.code == Error::StsUnsupportedFormat)
                    exceptionThrown = true;
            }
            ASSERT_EQ(exceptionThrown, exceptionsThrown.at(i));
        }
    }
}

CUDA_TEST_P(CheckDecodeSurfaces, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + GET_PARAM(1);
    int ulNumDecodeSurfaces = 0;
    {
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
        cv::cudacodec::FormatInfo fmt = reader->format();
        if (!fmt.valid) {
            reader->grab();
            fmt = reader->format();
            ASSERT_TRUE(fmt.valid);
        }
        ulNumDecodeSurfaces = fmt.ulNumDecodeSurfaces;
    }

    {
        cv::cudacodec::VideoReaderInitParams params;
        params.minNumDecodeSurfaces = ulNumDecodeSurfaces - 1;
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
        cv::cudacodec::FormatInfo fmt = reader->format();
        if (!fmt.valid) {
            reader->grab();
            fmt = reader->format();
            ASSERT_TRUE(fmt.valid);
        }
        ASSERT_TRUE(fmt.ulNumDecodeSurfaces == ulNumDecodeSurfaces);
        for (int i = 0; i < 100; i++) ASSERT_TRUE(reader->grab());
    }

    {
        cv::cudacodec::VideoReaderInitParams params;
        params.minNumDecodeSurfaces = ulNumDecodeSurfaces + 1;
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
        cv::cudacodec::FormatInfo fmt = reader->format();
        if (!fmt.valid) {
            reader->grab();
            fmt = reader->format();
            ASSERT_TRUE(fmt.valid);
        }
        ASSERT_TRUE(fmt.ulNumDecodeSurfaces == ulNumDecodeSurfaces + 1);
        for (int i = 0; i < 100; i++) ASSERT_TRUE(reader->grab());
    }
}

CUDA_TEST_P(CheckInitParams, Reader)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../" + GET_PARAM(1);
    cv::cudacodec::VideoReaderInitParams params;
    params.udpSource = GET_PARAM(2);
    params.allowFrameDrop = GET_PARAM(3);
    params.rawMode = GET_PARAM(4);
    double udpSource = 0, allowFrameDrop = 0, rawMode = 0;
    cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile, {}, params);
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_UDP_SOURCE, udpSource) && static_cast<bool>(udpSource) == params.udpSource);
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_ALLOW_FRAME_DROP, allowFrameDrop) && static_cast<bool>(allowFrameDrop) == params.allowFrameDrop);
    ASSERT_TRUE(reader->get(cv::cudacodec::VideoReaderProps::PROP_RAW_MODE, rawMode) && static_cast<bool>(rawMode) == params.rawMode);
}

#endif // HAVE_NVCUVID

#if defined(HAVE_NVCUVID) && defined(HAVE_NVCUVENC)
struct TransCode : testing::TestWithParam<cv::cuda::DeviceInfo>
{
    cv::cuda::DeviceInfo devInfo;
    virtual void SetUp()
    {
        devInfo = GetParam();
        cv::cuda::setDevice(devInfo.deviceID());
    }
};


CUDA_TEST_P(TransCode, H264ToH265)
{
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../highgui/video/big_buck_bunny.h264";
    constexpr cv::cudacodec::ColorFormat colorFormat = cv::cudacodec::ColorFormat::NV_NV12;
    constexpr double fps = 25;
    const cudacodec::Codec codec = cudacodec::Codec::HEVC;
    const std::string ext = ".h265";
    const std::string outputFile = cv::tempfile(ext.c_str());
    constexpr int nFrames = 5;
    Size frameSz;
    {
        cv::Ptr<cv::cudacodec::VideoReader> reader = cv::cudacodec::createVideoReader(inputFile);
        cv::cudacodec::FormatInfo fmt = reader->format();
        reader->set(cudacodec::ColorFormat::NV_NV12);
        cv::Ptr<cv::cudacodec::VideoWriter> writer;
        cv::cuda::GpuMat frame;
        cv::cuda::Stream stream;
        for (int i = 0; i < nFrames; ++i) {
            ASSERT_TRUE(reader->nextFrame(frame, stream));
            if (!fmt.valid) {
                fmt = reader->format();
                ASSERT_TRUE(fmt.valid);
            }
            ASSERT_FALSE(frame.empty());
            Mat tst; frame.download(tst);
            if (writer.empty()) {
                frameSz = Size(fmt.width, fmt.height);
                writer = cv::cudacodec::createVideoWriter(outputFile, frameSz, codec, fps, colorFormat, 0, stream);
            }
            writer->write(frame);
        }
    }

    {
        cv::VideoCapture cap(outputFile);
        ASSERT_TRUE(cap.isOpened());
        const int width = static_cast<int>(cap.get(CAP_PROP_FRAME_WIDTH));
        const int height = static_cast<int>(cap.get(CAP_PROP_FRAME_HEIGHT));
        ASSERT_EQ(frameSz, Size(width, height));
        ASSERT_EQ(fps, cap.get(CAP_PROP_FPS));
        Mat frame;
        for (int i = 0; i < nFrames; ++i) {
            cap >> frame;
            ASSERT_FALSE(frame.empty());
        }
    }
    ASSERT_EQ(0, remove(outputFile.c_str()));
}

INSTANTIATE_TEST_CASE_P(CUDA_Codec, TransCode, ALL_DEVICES);
#endif

#if defined(HAVE_NVCUVENC)

//////////////////////////////////////////////////////
// VideoWriter

//==========================================================================

void CvtColor(const Mat& in, Mat& out, const cudacodec::ColorFormat surfaceFormatCv) {
    switch (surfaceFormatCv) {
    case(cudacodec::ColorFormat::RGB):
        return cv::cvtColor(in, out, COLOR_BGR2RGB);
    case(cudacodec::ColorFormat::BGRA):
        return cv::cvtColor(in, out, COLOR_BGR2BGRA);
    case(cudacodec::ColorFormat::RGBA):
        return cv::cvtColor(in, out, COLOR_BGR2RGBA);
    case(cudacodec::ColorFormat::GRAY):
        return cv::cvtColor(in, out, COLOR_BGR2GRAY);
    default:
        in.copyTo(out);
    }
}

PARAM_TEST_CASE(Write, cv::cuda::DeviceInfo, bool, cv::cudacodec::Codec, double, cv::cudacodec::ColorFormat)
{
};

CUDA_TEST_P(Write, Writer)
{
    cv::cuda::setDevice(GET_PARAM(0).deviceID());
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../highgui/video/big_buck_bunny.mp4";
    const bool deviceSrc = GET_PARAM(1);
    const cudacodec::Codec codec = GET_PARAM(2);
    const double fps = GET_PARAM(3);
    const cv::cudacodec::ColorFormat colorFormat = GET_PARAM(4);
    const std::string ext = codec == cudacodec::Codec::H264 ? ".h264" : ".hevc";
    const std::string outputFile = cv::tempfile(ext.c_str());
    constexpr int nFrames = 5;
    Size frameSz;
    {
        cv::VideoCapture cap(inputFile);
        ASSERT_TRUE(cap.isOpened());
        cv::Ptr<cv::cudacodec::VideoWriter> writer;
        cv::Mat frame, frameNewSf;
        cv::cuda::GpuMat dFrame;
        cv::cuda::Stream stream;
        for (int i = 0; i < nFrames; ++i) {
            cap >> frame;
            ASSERT_FALSE(frame.empty());
            if (writer.empty()) {
                frameSz = frame.size();
                writer = cv::cudacodec::createVideoWriter(outputFile, frameSz, codec, fps, colorFormat, 0, stream);
            }
            CvtColor(frame, frameNewSf, colorFormat);
            if (deviceSrc) {
                dFrame.upload(frameNewSf);
                writer->write(dFrame);
            }
            else
                writer->write(frameNewSf);
        }
    }

    {
        cv::VideoCapture cap(outputFile);
        ASSERT_TRUE(cap.isOpened());
        const int width = static_cast<int>(cap.get(CAP_PROP_FRAME_WIDTH));
        const int height = static_cast<int>(cap.get(CAP_PROP_FRAME_HEIGHT));
        ASSERT_EQ(frameSz, Size(width, height));
        ASSERT_TRUE(abs(fps - cap.get(CAP_PROP_FPS)) < 0.5);
        Mat frame;
        for (int i = 0; i < nFrames; ++i) {
            cap >> frame;
            ASSERT_FALSE(frame.empty());
        }
    }
    ASSERT_EQ(0, remove(outputFile.c_str()));
}

#define DEVICE_SRC true, false
#define FPS 10, 29.7
#define CODEC cv::cudacodec::Codec::H264, cv::cudacodec::Codec::HEVC
#define COLOR_FORMAT cv::cudacodec::ColorFormat::BGR, cv::cudacodec::ColorFormat::RGB, cv::cudacodec::ColorFormat::BGRA, \
cv::cudacodec::ColorFormat::RGBA, cv::cudacodec::ColorFormat::GRAY
INSTANTIATE_TEST_CASE_P(CUDA_Codec, Write, testing::Combine(ALL_DEVICES, testing::Values(DEVICE_SRC), testing::Values(CODEC), testing::Values(FPS),
    testing::Values(COLOR_FORMAT)));


struct EncoderParams : testing::TestWithParam<cv::cuda::DeviceInfo>
{
    cv::cuda::DeviceInfo devInfo;
    cv::cudacodec::EncoderParams params;
    virtual void SetUp()
    {
        devInfo = GetParam();
        cv::cuda::setDevice(devInfo.deviceID());
        // Fixed params for CBR test
        params.nvPreset = cv::cudacodec::EncodePreset::ENC_PRESET_P7;
        params.tuningInfo = cv::cudacodec::EncodeTuningInfo::ENC_TUNING_INFO_HIGH_QUALITY;
        params.encodingProfile = cv::cudacodec::EncodeProfile::ENC_H264_PROFILE_MAIN;
        params.rateControlMode = cv::cudacodec::EncodeParamsRcMode::ENC_PARAMS_RC_CBR;
        params.multiPassEncoding = cv::cudacodec::EncodeMultiPass::ENC_TWO_PASS_FULL_RESOLUTION;
        params.averageBitRate = 1000000;
        params.maxBitRate = 0;
        params.targetQuality = 0;
        params.gopLength = 5;
    }
};


CUDA_TEST_P(EncoderParams, Writer)
{
    const std::string inputFile = std::string(cvtest::TS::ptr()->get_data_path()) + "../highgui/video/big_buck_bunny.mp4";
    constexpr double fps = 25.0;
    constexpr cudacodec::Codec codec = cudacodec::Codec::H264;
    const std::string ext = ".h264";
    const std::string outputFile = cv::tempfile(ext.c_str());
    Size frameSz;
    constexpr int nFrames = 5;
    {
        cv::VideoCapture reader(inputFile);
        ASSERT_TRUE(reader.isOpened());
        const cv::cudacodec::ColorFormat colorFormat = cv::cudacodec::ColorFormat::BGR;
        cv::Ptr<cv::cudacodec::VideoWriter> writer;
        cv::Mat frame;
        cv::cuda::GpuMat dFrame;
        cv::cuda::Stream stream;
        for (int i = 0; i < nFrames; ++i) {
            reader >> frame;
            ASSERT_FALSE(frame.empty());
            dFrame.upload(frame);
            if (writer.empty()) {
                frameSz = frame.size();
                writer = cv::cudacodec::createVideoWriter(outputFile, frameSz, codec, fps, colorFormat, params, 0, stream);
                cv::cudacodec::EncoderParams paramsOut = writer->getEncoderParams();
                ASSERT_EQ(params, paramsOut);
            }
            writer->write(dFrame);
        }
    }

    {
        cv::VideoCapture cap(outputFile);
        ASSERT_TRUE(cap.isOpened());
        const int width = static_cast<int>(cap.get(CAP_PROP_FRAME_WIDTH));
        const int height = static_cast<int>(cap.get(CAP_PROP_FRAME_HEIGHT));
        ASSERT_EQ(frameSz, Size(width, height));
        ASSERT_EQ(fps, cap.get(CAP_PROP_FPS));
        const bool checkGop = videoio_registry::hasBackend(CAP_FFMPEG);
        Mat frame;
        for (int i = 0; i < nFrames; ++i) {
            cap >> frame;
            ASSERT_FALSE(frame.empty());
            if (checkGop && (cap.get(CAP_PROP_FRAME_TYPE) == 73)) {
                ASSERT_TRUE(i % params.gopLength == 0);
            }
        }
    }
    ASSERT_EQ(0, remove(outputFile.c_str()));
}

INSTANTIATE_TEST_CASE_P(CUDA_Codec, EncoderParams, ALL_DEVICES);

#endif // HAVE_NVCUVENC

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckSet, testing::Combine(
    ALL_DEVICES,
    testing::Values("highgui/video/big_buck_bunny.mp4")));

#define VIDEO_SRC_SCALING "highgui/video/big_buck_bunny.mp4"
#define TARGET_SZ Size2f(1,1), Size2f(0.8f,0.9f), Size2f(2.3f,1.8f)
#define SRC_ROI Rect2f(0,0,1,1), Rect2f(0.25f,0.25f,0.5f,0.5f)
#define TARGET_ROI Rect2f(0,0,1,1), Rect2f(0.2f,0.3f,0.6f,0.7f)
INSTANTIATE_TEST_CASE_P(CUDA_Codec, Scaling, testing::Combine(
    ALL_DEVICES, testing::Values(VIDEO_SRC_SCALING), testing::Values(TARGET_SZ), testing::Values(SRC_ROI), testing::Values(TARGET_ROI)));

INSTANTIATE_TEST_CASE_P(CUDA_Codec, DisplayResolution, ALL_DEVICES);

#define VIDEO_SRC_R "highgui/video/big_buck_bunny.mp4", "cv/video/768x576.avi", "cv/video/1920x1080.avi", "highgui/video/big_buck_bunny.avi", \
    "highgui/video/big_buck_bunny.h264", "highgui/video/big_buck_bunny.h265", "highgui/video/big_buck_bunny.mpg", \
    "highgui/video/sample_322x242_15frames.yuv420p.libvpx-vp9.mp4", "highgui/video/sample_322x242_15frames.yuv420p.libaom-av1.mp4", \
    "cv/tracking/faceocc2/data/faceocc2.webm"
INSTANTIATE_TEST_CASE_P(CUDA_Codec, Video, testing::Combine(
    ALL_DEVICES,
    testing::Values(VIDEO_SRC_R)));

const color_conversion_params_t color_conversion_params[] =
{
    color_conversion_params_t("highgui/video/big_buck_bunny.h264", false),
    color_conversion_params_t("highgui/video/big_buck_bunny_full_color_range.h264", true),
};

#define VIDEO_COLOR_OUTPUTS cv::cudacodec::ColorFormat::BGRA, cv::cudacodec::ColorFormat::BGRA
INSTANTIATE_TEST_CASE_P(CUDA_Codec, ColorConversion, testing::Combine(
    ALL_DEVICES,
    testing::Values(VIDEO_COLOR_OUTPUTS),
    testing::ValuesIn(color_conversion_params)));

#define VIDEO_SRC_RW "highgui/video/big_buck_bunny.h264", "highgui/video/big_buck_bunny.h265"
INSTANTIATE_TEST_CASE_P(CUDA_Codec, VideoReadRaw, testing::Combine(
    ALL_DEVICES,
    testing::Values(VIDEO_SRC_RW)));

const check_extra_data_params_t check_extra_data_params[] =
{
    check_extra_data_params_t("highgui/video/big_buck_bunny.mp4", 45),
    check_extra_data_params_t("highgui/video/big_buck_bunny.mov", 45),
    check_extra_data_params_t("highgui/video/big_buck_bunny.mjpg.avi", 0)
};

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckExtraData, testing::Combine(
    ALL_DEVICES,
    testing::ValuesIn(check_extra_data_params)));

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckKeyFrame, testing::Combine(
    ALL_DEVICES,
    testing::Values(VIDEO_SRC_R)));

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckParams, ALL_DEVICES);

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckDecodeSurfaces, testing::Combine(
    ALL_DEVICES,
    testing::Values("highgui/video/big_buck_bunny.mp4")));

INSTANTIATE_TEST_CASE_P(CUDA_Codec, CheckInitParams, testing::Combine(
    ALL_DEVICES,
    testing::Values("highgui/video/big_buck_bunny.mp4"),
    testing::Values(true,false), testing::Values(true,false), testing::Values(true,false)));

#endif // HAVE_NVCUVID || HAVE_NVCUVENC
}} // namespace