/*M///////////////////////////////////////////////////////////////////////////////////////
//
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//
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//  If you do not agree to this license, do not download, install,
//  copy or use the software.
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//
//                        Intel License Agreement
//                For Open Source Computer Vision Library
//
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// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
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//M*/

#include "precomp.hpp"

#if !defined(HAVE_FFMPEG)
#error "Build configuration error"
#endif

#include <string>

#include "cap_ffmpeg_impl.hpp"

// TODO drop legacy code
//#define icvCreateFileCapture_FFMPEG_p cvCreateFileCapture_FFMPEG
#define icvReleaseCapture_FFMPEG_p cvReleaseCapture_FFMPEG
#define icvGrabFrame_FFMPEG_p cvGrabFrame_FFMPEG
#define icvRetrieveFrame_FFMPEG_p cvRetrieveFrame_FFMPEG
#define icvRetrieveFrame2_FFMPEG_p cvRetrieveFrame2_FFMPEG
#define icvSetCaptureProperty_FFMPEG_p cvSetCaptureProperty_FFMPEG
#define icvGetCaptureProperty_FFMPEG_p cvGetCaptureProperty_FFMPEG
#define icvCreateVideoWriter_FFMPEG_p cvCreateVideoWriter_FFMPEG
#define icvReleaseVideoWriter_FFMPEG_p cvReleaseVideoWriter_FFMPEG
#define icvWriteFrame_FFMPEG_p cvWriteFrame_FFMPEG


namespace cv {
namespace {

class CvCapture_FFMPEG_proxy CV_FINAL : public cv::VideoCaptureBase
{
public:
    CvCapture_FFMPEG_proxy() { ffmpegCapture = 0; }
    CvCapture_FFMPEG_proxy(const cv::String& filename, const cv::VideoCaptureParameters& params)
        : ffmpegCapture(NULL)
    {
        open(filename, params);
    }
    CvCapture_FFMPEG_proxy(const Ptr<IStreamReader>& stream, const cv::VideoCaptureParameters& params)
        : ffmpegCapture(NULL)
    {
        open(stream, params);
    }
    virtual ~CvCapture_FFMPEG_proxy() { close(); }

    virtual double getProperty_(int propId) const CV_OVERRIDE
    {
        return ffmpegCapture ? icvGetCaptureProperty_FFMPEG_p(ffmpegCapture, propId) : 0;
    }
    virtual bool setProperty_(int propId, double value) CV_OVERRIDE
    {
        return ffmpegCapture ? icvSetCaptureProperty_FFMPEG_p(ffmpegCapture, propId, value)!=0 : false;
    }
    virtual bool grabFrame() CV_OVERRIDE
    {
        return ffmpegCapture ? icvGrabFrame_FFMPEG_p(ffmpegCapture)!=0 : false;
    }
    virtual bool retrieveFrame_(int flag, cv::OutputArray frame) CV_OVERRIDE
    {
        unsigned char* data = 0;
        int step=0, width=0, height=0, cn=0, depth=0;

        if (!ffmpegCapture)
            return false;

        // if UMat, try GPU to GPU copy using OpenCL extensions
        if (frame.isUMat()) {
            if (ffmpegCapture->retrieveHWFrame(frame)) {
                return true;
            }
        }

        if (flag == 0) {
            if (!icvRetrieveFrame2_FFMPEG_p(ffmpegCapture, &data, &step, &width, &height, &cn, &depth))
                return false;
        }
        else {
            if (!ffmpegCapture->retrieveFrame(flag, &data, &step, &width, &height, &cn, &depth))
                return false;
        }

        cv::Mat(height, width, CV_MAKETYPE(depth, cn), data, step).copyTo(frame);
        return true;
    }
    bool open(const cv::String& filename, const cv::VideoCaptureParameters& params)
    {
        close();

        ffmpegCapture = cvCreateFileCaptureWithParams_FFMPEG(filename.c_str(), params);
        return ffmpegCapture != 0;
    }
    bool open(const Ptr<IStreamReader>& stream, const cv::VideoCaptureParameters& params)
    {
        close();

        readStream = stream;  // Increase counter
        ffmpegCapture = cvCreateStreamCaptureWithParams_FFMPEG(stream, params);
        return ffmpegCapture != 0;
    }
    void close()
    {
        if (ffmpegCapture)
            icvReleaseCapture_FFMPEG_p( &ffmpegCapture );
        CV_Assert(ffmpegCapture == 0);
        ffmpegCapture = 0;
    }

    virtual bool isOpened() const CV_OVERRIDE { return ffmpegCapture != 0; }
    virtual int getCaptureDomain() CV_OVERRIDE { return cv::CAP_FFMPEG; }

protected:
    CvCapture_FFMPEG* ffmpegCapture;
    Ptr<IStreamReader> readStream;
};

} // namespace

cv::Ptr<cv::IVideoCapture> cvCreateFileCapture_FFMPEG_proxy(const std::string &filename, const cv::VideoCaptureParameters& params)
{
    cv::Ptr<CvCapture_FFMPEG_proxy> capture = cv::makePtr<CvCapture_FFMPEG_proxy>(filename, params);
    if (capture && capture->isOpened())
        return capture;
    return cv::Ptr<cv::IVideoCapture>();
}

cv::Ptr<cv::IVideoCapture> cvCreateStreamCapture_FFMPEG_proxy(const Ptr<IStreamReader>& stream, const cv::VideoCaptureParameters& params)
{
    cv::Ptr<CvCapture_FFMPEG_proxy> capture = std::make_shared<CvCapture_FFMPEG_proxy>(stream, params);
    if (capture && capture->isOpened())
        return capture;
    return cv::Ptr<cv::IVideoCapture>();
}

namespace {

class CvVideoWriter_FFMPEG_proxy CV_FINAL :
    public cv::IVideoWriter
{
public:
    CvVideoWriter_FFMPEG_proxy() { ffmpegWriter = 0; }
    CvVideoWriter_FFMPEG_proxy(const cv::String& filename, int fourcc, double fps, cv::Size frameSize, const VideoWriterParameters& params) { ffmpegWriter = 0; open(filename, fourcc, fps, frameSize, params); }
    virtual ~CvVideoWriter_FFMPEG_proxy() { close(); }

    int getCaptureDomain() const CV_OVERRIDE { return cv::CAP_FFMPEG; }

    virtual void write(cv::InputArray image ) CV_OVERRIDE
    {
        if(!ffmpegWriter)
            return;
        CV_Assert(image.depth() == CV_8U || image.depth() == CV_16U);

        // if UMat, try GPU to GPU copy using OpenCL extensions
        if (image.isUMat()) {
            if (ffmpegWriter->writeHWFrame(image)) {
                return;
            }
        }

        if (!icvWriteFrame_FFMPEG_p(ffmpegWriter, (const uchar*)image.getMat().ptr(), (int)image.step(), image.cols(), image.rows(), image.channels(), 0))
            CV_LOG_WARNING(NULL, "FFmpeg: Failed to write frame");
    }
    virtual bool open( const cv::String& filename, int fourcc, double fps, cv::Size frameSize, const VideoWriterParameters& params )
    {
        close();
        ffmpegWriter = cvCreateVideoWriterWithParams_FFMPEG( filename.c_str(), fourcc, fps, frameSize.width, frameSize.height, params );
        return ffmpegWriter != 0;
    }

    virtual void close()
    {
        if (ffmpegWriter)
            icvReleaseVideoWriter_FFMPEG_p( &ffmpegWriter );
        CV_Assert(ffmpegWriter == 0);
        ffmpegWriter = 0;
    }

    virtual double getProperty(int propId) const CV_OVERRIDE {
        if(!ffmpegWriter)
            return 0;
        return ffmpegWriter->getProperty(propId);
    }

    virtual bool setProperty(int propId, double value) CV_OVERRIDE {
        if (!ffmpegWriter)
            return 0;
        return ffmpegWriter->setProperty(propId, value);
    }
    virtual bool isOpened() const CV_OVERRIDE { return ffmpegWriter != 0; }

protected:
    CvVideoWriter_FFMPEG* ffmpegWriter;
};

} // namespace

cv::Ptr<cv::IVideoWriter> cvCreateVideoWriter_FFMPEG_proxy(const std::string& filename, int fourcc,
                                                           double fps, const cv::Size& frameSize,
                                                           const VideoWriterParameters& params)
{
    cv::Ptr<CvVideoWriter_FFMPEG_proxy> writer = cv::makePtr<CvVideoWriter_FFMPEG_proxy>(filename, fourcc, fps, frameSize, params);
    if (writer && writer->isOpened())
        return writer;
    return cv::Ptr<cv::IVideoWriter>();
}

} // namespace



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

#if defined(BUILD_PLUGIN)

#define NEW_PLUGIN

#ifndef NEW_PLUGIN
#define ABI_VERSION 0
#define API_VERSION 0
#include "plugin_api.hpp"
#else
#define CAPTURE_ABI_VERSION 1
#define CAPTURE_API_VERSION 2
#include "plugin_capture_api.hpp"
#define WRITER_ABI_VERSION 1
#define WRITER_API_VERSION 1
#include "plugin_writer_api.hpp"
#endif

namespace cv {

static
CvResult CV_API_CALL cv_capture_open(const char* filename, int camera_index, CV_OUT CvPluginCapture* handle)
{
    if (!handle)
        return CV_ERROR_FAIL;
    *handle = NULL;
    if (!filename)
        return CV_ERROR_FAIL;
    CV_UNUSED(camera_index);
    CvCapture_FFMPEG_proxy *cap = 0;
    try
    {
        cap = new CvCapture_FFMPEG_proxy(String(filename), cv::VideoCaptureParameters());
        if (cap->isOpened())
        {
            *handle = (CvPluginCapture)cap;
            return CV_ERROR_OK;
        }
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
    }
    if (cap)
        delete cap;
    return CV_ERROR_FAIL;
}

static
CvResult CV_API_CALL cv_capture_open_with_params(
        const char* filename, int camera_index,
        int* params, unsigned n_params,
        CV_OUT CvPluginCapture* handle
)
{
    if (!handle)
        return CV_ERROR_FAIL;
    *handle = NULL;
    if (!filename)
        return CV_ERROR_FAIL;
    CV_UNUSED(camera_index);
    CvCapture_FFMPEG_proxy *cap = 0;
    try
    {
        cv::VideoCaptureParameters parameters(params, n_params);
        cap = new CvCapture_FFMPEG_proxy(String(filename), parameters);
        if (cap->isOpened())
        {
            *handle = (CvPluginCapture)cap;
            return CV_ERROR_OK;
        }
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
    }
    if (cap)
        delete cap;
    return CV_ERROR_FAIL;
}

static
CvResult CV_API_CALL cv_capture_open_buffer(
        void* opaque,
        long long(*read)(void* opaque, char* buffer, long long size),
        long long(*seek)(void* opaque, long long offset, int way),
        int* params, unsigned n_params,
        CV_OUT CvPluginCapture* handle
)
{
    if (!handle)
        return CV_ERROR_FAIL;
    *handle = NULL;
    CvCapture_FFMPEG_proxy *cap = 0;
    try
    {
        cv::VideoCaptureParameters parameters(params, n_params);
        cap = new CvCapture_FFMPEG_proxy(makePtr<PluginStreamReader>(opaque, read, seek), parameters);
        if (cap->isOpened())
        {
            *handle = (CvPluginCapture)cap;
            return CV_ERROR_OK;
        }
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
    }
    if (cap)
        delete cap;
    return CV_ERROR_FAIL;
}

static
CvResult CV_API_CALL cv_capture_release(CvPluginCapture handle)
{
    if (!handle)
        return CV_ERROR_FAIL;
    CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
    delete instance;
    return CV_ERROR_OK;
}


static
CvResult CV_API_CALL cv_capture_get_prop(CvPluginCapture handle, int prop, CV_OUT double* val)
{
    if (!handle)
        return CV_ERROR_FAIL;
    if (!val)
        return CV_ERROR_FAIL;
    try
    {
        CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
        *val = instance->getProperty(prop);
        return CV_ERROR_OK;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}

static
CvResult CV_API_CALL cv_capture_set_prop(CvPluginCapture handle, int prop, double val)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
        return instance->setProperty(prop, val) ? CV_ERROR_OK : CV_ERROR_FAIL;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}

static
CvResult CV_API_CALL cv_capture_grab(CvPluginCapture handle)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
        return instance->grabFrame() ? CV_ERROR_OK : CV_ERROR_FAIL;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}

#ifndef NEW_PLUGIN
static
CvResult CV_API_CALL cv_capture_retrieve(CvPluginCapture handle, int stream_idx, cv_videoio_retrieve_cb_t callback, void* userdata)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
        Mat img;
        // TODO: avoid unnecessary copying
        if (instance->retrieveFrame(stream_idx, img))
            return callback(stream_idx, img.data, (int)img.step, img.cols, img.rows, img.channels(), userdata);
        return CV_ERROR_FAIL;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}
#else
static
CvResult CV_API_CALL cv_capture_retrieve(CvPluginCapture handle, int stream_idx, cv_videoio_capture_retrieve_cb_t callback, void* userdata)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvCapture_FFMPEG_proxy* instance = (CvCapture_FFMPEG_proxy*)handle;
        Mat img;
        // TODO: avoid unnecessary copying
        if (instance->retrieveFrame(stream_idx, img))
            return callback(stream_idx, img.data, (int)img.step, img.cols, img.rows, img.type(), userdata);
        return CV_ERROR_FAIL;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}
#endif

static
CvResult CV_API_CALL cv_writer_open_with_params(
        const char* filename, int fourcc, double fps, int width, int height,
        int* params, unsigned n_params,
        CV_OUT CvPluginWriter* handle)
{
    Size sz(width, height);
    CvVideoWriter_FFMPEG_proxy* wrt = 0;
    try
    {
        VideoWriterParameters parameters(params, n_params);
        wrt = new CvVideoWriter_FFMPEG_proxy(filename, fourcc, fps, sz, parameters);
        if(wrt && wrt->isOpened())
        {
            *handle = (CvPluginWriter)wrt;
            return CV_ERROR_OK;
        }
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
    }
    if (wrt)
        delete wrt;
    return CV_ERROR_FAIL;
}

static
CvResult CV_API_CALL cv_writer_open(const char* filename, int fourcc, double fps, int width, int height, int isColor,
    CV_OUT CvPluginWriter* handle)
{
    int params[2] = { VIDEOWRITER_PROP_IS_COLOR, isColor };
    return cv_writer_open_with_params(filename, fourcc, fps, width, height, params, 1, handle);
}

static
CvResult CV_API_CALL cv_writer_release(CvPluginWriter handle)
{
    if (!handle)
        return CV_ERROR_FAIL;
    CvVideoWriter_FFMPEG_proxy* instance = (CvVideoWriter_FFMPEG_proxy*)handle;
    delete instance;
    return CV_ERROR_OK;
}

static
CvResult CV_API_CALL cv_writer_get_prop(CvPluginWriter handle, int prop, CV_OUT double* val)
{
    if (!handle)
        return CV_ERROR_FAIL;
    if (!val)
        return CV_ERROR_FAIL;
    try
    {
        CvVideoWriter_FFMPEG_proxy* instance = (CvVideoWriter_FFMPEG_proxy*)handle;
        *val = instance->getProperty(prop);
        return CV_ERROR_OK;
    }
    catch (...)
    {
        return CV_ERROR_FAIL;
    }
}

static
CvResult CV_API_CALL cv_writer_set_prop(CvPluginWriter handle, int prop, double val)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvVideoWriter_FFMPEG_proxy* instance = (CvVideoWriter_FFMPEG_proxy*)handle;
        return (instance->setProperty(prop, val) ? CV_ERROR_OK : CV_ERROR_FAIL);
    }
    catch (...)
    {
        return CV_ERROR_FAIL;
    }
    return CV_ERROR_FAIL;
}

static
CvResult CV_API_CALL cv_writer_write(CvPluginWriter handle, const unsigned char *data, int step, int width, int height, int cn)
{
    if (!handle)
        return CV_ERROR_FAIL;
    try
    {
        CvVideoWriter_FFMPEG_proxy* instance = (CvVideoWriter_FFMPEG_proxy*)handle;
        Mat img(Size(width, height), CV_MAKETYPE(CV_8U, cn), const_cast<uchar*>(data), step);
        instance->write(img);
        return CV_ERROR_OK;
    }
    catch (const std::exception& e)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Exception is raised: " << e.what());
        return CV_ERROR_FAIL;
    }
    catch (...)
    {
        CV_LOG_WARNING(NULL, "FFmpeg: Unknown C++ exception is raised");
        return CV_ERROR_FAIL;
    }
}

} // namespace

#ifndef NEW_PLUGIN

static const OpenCV_VideoIO_Plugin_API_preview plugin_api =
{
    {
        sizeof(OpenCV_VideoIO_Plugin_API_preview), ABI_VERSION, API_VERSION,
        CV_VERSION_MAJOR, CV_VERSION_MINOR, CV_VERSION_REVISION, CV_VERSION_STATUS,
        "FFmpeg OpenCV Video I/O plugin"
    },
    {
        /*  1*/CAP_FFMPEG,
        /*  2*/cv_capture_open,
        /*  3*/cv_capture_release,
        /*  4*/cv_capture_get_prop,
        /*  5*/cv_capture_set_prop,
        /*  6*/cv_capture_grab,
        /*  7*/cv_capture_retrieve,
        /*  8*/cv_writer_open,
        /*  9*/cv_writer_release,
        /* 10*/cv_writer_get_prop,
        /* 11*/cv_writer_set_prop,
        /* 12*/cv_writer_write
    }
};

const OpenCV_VideoIO_Plugin_API_preview* opencv_videoio_plugin_init_v0(int requested_abi_version, int requested_api_version, void* /*reserved=NULL*/) CV_NOEXCEPT
{
    if (requested_abi_version == ABI_VERSION && requested_api_version <= API_VERSION)
        return &plugin_api;
    return NULL;
}

#else  // NEW_PLUGIN

static const OpenCV_VideoIO_Capture_Plugin_API capture_plugin_api =
{
    {
        sizeof(OpenCV_VideoIO_Capture_Plugin_API), CAPTURE_ABI_VERSION, CAPTURE_API_VERSION,
        CV_VERSION_MAJOR, CV_VERSION_MINOR, CV_VERSION_REVISION, CV_VERSION_STATUS,
        "FFmpeg OpenCV Video I/O Capture plugin"
    },
    {
        /*  1*/CAP_FFMPEG,
        /*  2*/cv_capture_open,
        /*  3*/cv_capture_release,
        /*  4*/cv_capture_get_prop,
        /*  5*/cv_capture_set_prop,
        /*  6*/cv_capture_grab,
        /*  7*/cv_capture_retrieve,
    },
    {
        /*  8*/cv_capture_open_with_params,
    },
    {
        /*  9*/cv_capture_open_buffer,
    }
};

const OpenCV_VideoIO_Capture_Plugin_API* opencv_videoio_capture_plugin_init_v1(int requested_abi_version, int requested_api_version, void* /*reserved=NULL*/) CV_NOEXCEPT
{
    if (requested_abi_version == CAPTURE_ABI_VERSION && requested_api_version <= CAPTURE_API_VERSION)
        return &capture_plugin_api;
    return NULL;
}

static const OpenCV_VideoIO_Writer_Plugin_API writer_plugin_api =
{
    {
        sizeof(OpenCV_VideoIO_Writer_Plugin_API), WRITER_ABI_VERSION, WRITER_API_VERSION,
        CV_VERSION_MAJOR, CV_VERSION_MINOR, CV_VERSION_REVISION, CV_VERSION_STATUS,
        "FFmpeg OpenCV Video I/O Writer plugin"
    },
    {
        /*  1*/CAP_FFMPEG,
        /*  2*/cv_writer_open,
        /*  3*/cv_writer_release,
        /*  4*/cv_writer_get_prop,
        /*  5*/cv_writer_set_prop,
        /*  6*/cv_writer_write
    },
    {
        /*  7*/cv_writer_open_with_params
    }
};

const OpenCV_VideoIO_Writer_Plugin_API* opencv_videoio_writer_plugin_init_v1(int requested_abi_version, int requested_api_version, void* /*reserved=NULL*/) CV_NOEXCEPT
{
    if (requested_abi_version == WRITER_ABI_VERSION && requested_api_version <= WRITER_API_VERSION)
        return &writer_plugin_api;
    return NULL;
}

#endif  // NEW_PLUGIN

#endif // BUILD_PLUGIN