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#ifndef OPENCV_CUDACODEC_HPP
#define OPENCV_CUDACODEC_HPP

#ifndef __cplusplus
#  error cudacodec.hpp header must be compiled as C++
#endif

#include "opencv2/core/cuda.hpp"

/**
  @addtogroup cuda
  @{
    @defgroup cudacodec Video Encoding/Decoding
  @}
 */

namespace cv { namespace cudacodec {

using namespace cuda;  // Stream

//! @addtogroup cudacodec
//! @{

////////////////////////////////// Video Encoding //////////////////////////////////

// Works only under Windows.
// Supports only H264 video codec and AVI files.

enum SurfaceFormat
{
    SF_UYVY = 0,
    SF_YUY2,
    SF_YV12,
    SF_NV12,
    SF_IYUV,
    SF_BGR,
    SF_GRAY = SF_BGR
};

/** @brief Different parameters for CUDA video encoder.
 */
struct CV_EXPORTS_W EncoderParams
{
    int P_Interval;      //!< NVVE_P_INTERVAL,
    int IDR_Period;      //!< NVVE_IDR_PERIOD,
    int DynamicGOP;      //!< NVVE_DYNAMIC_GOP,
    int RCType;          //!< NVVE_RC_TYPE,
    int AvgBitrate;      //!< NVVE_AVG_BITRATE,
    int PeakBitrate;     //!< NVVE_PEAK_BITRATE,
    int QP_Level_Intra;  //!< NVVE_QP_LEVEL_INTRA,
    int QP_Level_InterP; //!< NVVE_QP_LEVEL_INTER_P,
    int QP_Level_InterB; //!< NVVE_QP_LEVEL_INTER_B,
    int DeblockMode;     //!< NVVE_DEBLOCK_MODE,
    int ProfileLevel;    //!< NVVE_PROFILE_LEVEL,
    int ForceIntra;      //!< NVVE_FORCE_INTRA,
    int ForceIDR;        //!< NVVE_FORCE_IDR,
    int ClearStat;       //!< NVVE_CLEAR_STAT,
    int DIMode;          //!< NVVE_SET_DEINTERLACE,
    int Presets;         //!< NVVE_PRESETS,
    int DisableCabac;    //!< NVVE_DISABLE_CABAC,
    int NaluFramingType; //!< NVVE_CONFIGURE_NALU_FRAMING_TYPE
    int DisableSPSPPS;   //!< NVVE_DISABLE_SPS_PPS

    EncoderParams();
    /** @brief Constructors.

    @param configFile Config file name.

    Creates default parameters or reads parameters from config file.
     */
    explicit EncoderParams(const String& configFile);

    /** @brief Reads parameters from config file.

    @param configFile Config file name.
     */
    void load(const String& configFile);
    /** @brief Saves parameters to config file.

    @param configFile Config file name.
     */
    void save(const String& configFile) const;
};

/** @brief Callbacks for CUDA video encoder.
 */
class CV_EXPORTS_W EncoderCallBack
{
public:
    enum PicType
    {
        IFRAME = 1,
        PFRAME = 2,
        BFRAME = 3
    };

    virtual ~EncoderCallBack() {}

    /** @brief Callback function to signal the start of bitstream that is to be encoded.

    Callback must allocate buffer for CUDA encoder and return pointer to it and it's size.
     */
    virtual uchar* acquireBitStream(int* bufferSize) = 0;

    /** @brief Callback function to signal that the encoded bitstream is ready to be written to file.
    */
    virtual void releaseBitStream(unsigned char* data, int size) = 0;

    /** @brief Callback function to signal that the encoding operation on the frame has started.

    @param frameNumber
    @param picType Specify frame type (I-Frame, P-Frame or B-Frame).
     */
    CV_WRAP virtual void onBeginFrame(int frameNumber, EncoderCallBack::PicType picType) = 0;

    /** @brief Callback function signals that the encoding operation on the frame has finished.

    @param frameNumber
    @param picType Specify frame type (I-Frame, P-Frame or B-Frame).
     */
    CV_WRAP virtual void onEndFrame(int frameNumber, EncoderCallBack::PicType picType) = 0;
};

/** @brief Video writer interface.

The implementation uses H264 video codec.

@note Currently only Windows platform is supported.

@note
   -   An example on how to use the videoWriter class can be found at
        opencv_source_code/samples/gpu/video_writer.cpp
 */
class CV_EXPORTS_W VideoWriter
{
public:
    virtual ~VideoWriter() {}

    /** @brief Writes the next video frame.

    @param frame The written frame.
    @param lastFrame Indicates that it is end of stream. The parameter can be ignored.

    The method write the specified image to video file. The image must have the same size and the same
    surface format as has been specified when opening the video writer.
     */
    CV_WRAP virtual void write(InputArray frame, bool lastFrame = false) = 0;

    CV_WRAP virtual EncoderParams getEncoderParams() const = 0;
};

/** @brief Creates video writer.

@param fileName Name of the output video file. Only AVI file format is supported.
@param frameSize Size of the input video frames.
@param fps Framerate of the created video stream.
@param format Surface format of input frames ( SF_UYVY , SF_YUY2 , SF_YV12 , SF_NV12 ,
SF_IYUV , SF_BGR or SF_GRAY). BGR or gray frames will be converted to YV12 format before
encoding, frames with other formats will be used as is.

The constructors initialize video writer. FFMPEG is used to write videos. User can implement own
multiplexing with cudacodec::EncoderCallBack .
 */
CV_EXPORTS_W Ptr<cudacodec::VideoWriter> createVideoWriter(const String& fileName, Size frameSize, double fps, SurfaceFormat format = SF_BGR);
/** @overload
@param fileName Name of the output video file. Only AVI file format is supported.
@param frameSize Size of the input video frames.
@param fps Framerate of the created video stream.
@param params Encoder parameters. See cudacodec::EncoderParams .
@param format Surface format of input frames ( SF_UYVY , SF_YUY2 , SF_YV12 , SF_NV12 ,
SF_IYUV , SF_BGR or SF_GRAY). BGR or gray frames will be converted to YV12 format before
encoding, frames with other formats will be used as is.
*/
CV_EXPORTS_W Ptr<cudacodec::VideoWriter> createVideoWriter(const String& fileName, Size frameSize, double fps, const EncoderParams& params, SurfaceFormat format = SF_BGR);

/** @overload
@param encoderCallback Callbacks for video encoder. See cudacodec::EncoderCallBack . Use it if you
want to work with raw video stream.
@param frameSize Size of the input video frames.
@param fps Framerate of the created video stream.
@param format Surface format of input frames ( SF_UYVY , SF_YUY2 , SF_YV12 , SF_NV12 ,
SF_IYUV , SF_BGR or SF_GRAY). BGR or gray frames will be converted to YV12 format before
encoding, frames with other formats will be used as is.
*/
CV_EXPORTS_W Ptr<cudacodec::VideoWriter> createVideoWriter(const Ptr<EncoderCallBack>& encoderCallback, Size frameSize, double fps, SurfaceFormat format = SF_BGR);
/** @overload
@param encoderCallback Callbacks for video encoder. See cudacodec::EncoderCallBack . Use it if you
want to work with raw video stream.
@param frameSize Size of the input video frames.
@param fps Framerate of the created video stream.
@param params Encoder parameters. See cudacodec::EncoderParams.
@param format Surface format of input frames ( SF_UYVY , SF_YUY2 , SF_YV12 , SF_NV12 ,
SF_IYUV , SF_BGR or SF_GRAY). BGR or gray frames will be converted to YV12 format before
encoding, frames with other formats will be used as is.
*/
CV_EXPORTS_W Ptr<cudacodec::VideoWriter> createVideoWriter(const Ptr<EncoderCallBack>& encoderCallback, Size frameSize, double fps, const EncoderParams& params, SurfaceFormat format = SF_BGR);

////////////////////////////////// Video Decoding //////////////////////////////////////////

/** @brief Video codecs supported by cudacodec::VideoReader .
 */
enum Codec
{
    MPEG1 = 0,
    MPEG2,
    MPEG4,
    VC1,
    H264,
    JPEG,
    H264_SVC,
    H264_MVC,
    HEVC,
    VP8,
    VP9,
    AV1,
    NumCodecs,

    Uncompressed_YUV420 = (('I'<<24)|('Y'<<16)|('U'<<8)|('V')),   //!< Y,U,V (4:2:0)
    Uncompressed_YV12   = (('Y'<<24)|('V'<<16)|('1'<<8)|('2')),   //!< Y,V,U (4:2:0)
    Uncompressed_NV12   = (('N'<<24)|('V'<<16)|('1'<<8)|('2')),   //!< Y,UV  (4:2:0)
    Uncompressed_YUYV   = (('Y'<<24)|('U'<<16)|('Y'<<8)|('V')),   //!< YUYV/YUY2 (4:2:2)
    Uncompressed_UYVY   = (('U'<<24)|('Y'<<16)|('V'<<8)|('Y'))    //!< UYVY (4:2:2)
};

/** @brief Chroma formats supported by cudacodec::VideoReader.
 */
enum ChromaFormat
{
    Monochrome = 0,
    YUV420,
    YUV422,
    YUV444,
    NumFormats
};

/** @brief Deinterlacing mode used by decoder.
* @param Weave Weave both fields (no deinterlacing). For progressive content and for content that doesn't need deinterlacing.
* Bob Drop one field.
* @param Adaptive Adaptive deinterlacing needs more video memory than other deinterlacing modes.
* */
enum DeinterlaceMode
{
    Weave = 0,
    Bob = 1,
    Adaptive = 2
};

/** @brief Struct providing information about video file format. :
 */
struct FormatInfo
{
    Codec codec;
    ChromaFormat chromaFormat;
    int nBitDepthMinus8 = -1;
    int ulWidth = 0;//!< Coded sequence width in pixels.
    int ulHeight = 0;//!< Coded sequence height in pixels.
    int width = 0;//!< Width of the decoded frame returned by nextFrame(frame).
    int height = 0;//!< Height of the decoded frame returned by nextFrame(frame).
    int ulMaxWidth = 0;
    int ulMaxHeight = 0;
    Rect displayArea;//!< ROI inside the decoded frame returned by nextFrame(frame), containing the useable video frame.
    bool valid = false;
    double fps = 0;
    int ulNumDecodeSurfaces = 0;//!< Maximum number of internal decode surfaces.
    DeinterlaceMode deinterlaceMode;
};

/** @brief cv::cudacodec::VideoReader generic properties identifier.
*/
enum class VideoReaderProps {
    PROP_DECODED_FRAME_IDX = 0, //!< Index for retrieving the decoded frame using retrieve().
    PROP_EXTRA_DATA_INDEX = 1, //!< Index for retrieving the extra data associated with a video source using retrieve().
    PROP_RAW_PACKAGES_BASE_INDEX = 2, //!< Base index for retrieving raw encoded data using retrieve().
    PROP_NUMBER_OF_RAW_PACKAGES_SINCE_LAST_GRAB = 3, //!< Number of raw packages recieved since the last call to grab().
    PROP_RAW_MODE = 4, //!< Status of raw mode.
    PROP_LRF_HAS_KEY_FRAME = 5, //!< FFmpeg source only - Indicates whether the Last Raw Frame (LRF), output from VideoReader::retrieve() when VideoReader is initialized in raw mode, contains encoded data for a key frame.
#ifndef CV_DOXYGEN
    PROP_NOT_SUPPORTED
#endif
};

/** @brief Video reader interface.

@note
   -   An example on how to use the videoReader class can be found at
        opencv_source_code/samples/gpu/video_reader.cpp
 */
class CV_EXPORTS_W VideoReader
{
public:
    virtual ~VideoReader() {}

    /** @brief Grabs, decodes and returns the next video frame.

    If no frames has been grabbed (there are no more frames in video file), the methods return false .
    The method throws Exception if error occurs.
     */
    CV_WRAP virtual bool nextFrame(CV_OUT GpuMat& frame, Stream &stream = Stream::Null()) = 0;

    /** @brief Returns information about video file format.
    */
    virtual FormatInfo format() const = 0;

    /** @brief Grabs the next frame from the video source.

    @return `true` (non-zero) in the case of success.

    The method/function grabs the next frame from video file or camera and returns true (non-zero) in
    the case of success.

    The primary use of the function is for reading both the encoded and decoded video data when rawMode is enabled.  With rawMode enabled
    retrieve() can be called following grab() to retrieve all the data associated with the current video source since the last call to grab() or the creation of the VideoReader.
     */
    CV_WRAP virtual bool grab(Stream& stream = Stream::Null()) = 0;

    /** @brief Returns previously grabbed video data.

    @param [out] frame The returned data which depends on the provided idx.  If there is no new data since the last call to grab() the image will be empty.
    @param idx Determins the returned data inside image. The returned data can be the:
    Decoded frame, idx = get(PROP_DECODED_FRAME_IDX).
    Extra data if available, idx = get(PROP_EXTRA_DATA_INDEX).
    Raw encoded data package.  To retrieve package i,  idx = get(PROP_RAW_PACKAGES_BASE_INDEX) + i with i < get(PROP_NUMBER_OF_RAW_PACKAGES_SINCE_LAST_GRAB)
    @return `false` if no frames has been grabbed

    The method returns data associated with the current video source since the last call to grab() or the creation of the VideoReader. If no data is present
    the method returns false and the function returns an empty image.
     */
    CV_WRAP virtual bool retrieve(CV_OUT OutputArray frame, const size_t idx = static_cast<size_t>(VideoReaderProps::PROP_DECODED_FRAME_IDX)) const = 0;

    /** @brief Sets a property in the VideoReader.

    @param propertyId Property identifier from cv::cudacodec::VideoReaderProps (eg. cv::cudacodec::VideoReaderProps::PROP_DECODED_FRAME_IDX,
    cv::cudacodec::VideoReaderProps::PROP_EXTRA_DATA_INDEX, ...).
    @param propertyVal Value of the property.
    @return `true` if the property has been set.
     */
    CV_WRAP virtual bool set(const VideoReaderProps propertyId, const double propertyVal) = 0;

    /** @brief Returns the specified VideoReader property

    @param propertyId Property identifier from cv::cudacodec::VideoReaderProps (eg. cv::cudacodec::VideoReaderProps::PROP_DECODED_FRAME_IDX,
    cv::cudacodec::VideoReaderProps::PROP_EXTRA_DATA_INDEX, ...).
    @param propertyVal
    In - Optional value required for querying specific propertyId's, e.g. the index of the raw package to be checked for a key frame (cv::cudacodec::VideoReaderProps::PROP_LRF_HAS_KEY_FRAME).
    Out - Value of the property.
    @return `true` unless the property is not supported.
    */
    CV_WRAP virtual bool get(const VideoReaderProps propertyId, CV_IN_OUT double& propertyVal) const = 0;

    /** @brief Retrieves the specified property used by the VideoSource.

    @param propertyId Property identifier from cv::VideoCaptureProperties (eg. cv::CAP_PROP_POS_MSEC, cv::CAP_PROP_POS_FRAMES, ...)
    or one from @ref videoio_flags_others.
    @param propertyVal Value for the specified property.

    @return `true` unless the property is unset set or not supported.
     */
    CV_WRAP virtual bool get(const int propertyId, CV_OUT double& propertyVal) const = 0;
};

/** @brief Interface for video demultiplexing. :

User can implement own demultiplexing by implementing this interface.
 */
class CV_EXPORTS_W RawVideoSource
{
public:
    virtual ~RawVideoSource() {}

    /** @brief Returns next packet with RAW video frame.

    @param data Pointer to frame data.
    @param size Size in bytes of current frame.
     */
    virtual bool getNextPacket(unsigned char** data, size_t* size) = 0;

    /** @brief Returns true if the last packet contained a key frame.
     */
    virtual bool lastPacketContainsKeyFrame() const { return false; }

    /** @brief Returns information about video file format.
    */
    virtual FormatInfo format() const = 0;

    /** @brief Updates the coded width and height inside format.
    */
    virtual void updateFormat(const FormatInfo& videoFormat) = 0;

    /** @brief Returns any extra data associated with the video source.

    @param extraData 1D cv::Mat containing the extra data if it exists.
     */
    virtual void getExtraData(cv::Mat& extraData) const = 0;

    /** @brief Retrieves the specified property used by the VideoSource.

    @param propertyId Property identifier from cv::VideoCaptureProperties (eg. cv::CAP_PROP_POS_MSEC, cv::CAP_PROP_POS_FRAMES, ...)
    or one from @ref videoio_flags_others.
    @param propertyVal Value for the specified property.

    @return `true` unless the property is unset set or not supported.
     */
    virtual bool get(const int propertyId, double& propertyVal) const = 0;
};

/** @brief Creates video reader.

@param filename Name of the input video file.
@param params Pass through parameters for VideoCapure.  VideoCapture with the FFMpeg back end (CAP_FFMPEG) is used to parse the video input.
The `params` parameter allows to specify extra parameters encoded as pairs `(paramId_1, paramValue_1, paramId_2, paramValue_2, ...)`.
    See cv::VideoCaptureProperties
e.g. when streaming from an RTSP source CAP_PROP_OPEN_TIMEOUT_MSEC may need to be set.
@param rawMode Allow the raw encoded data which has been read up until the last call to grab() to be retrieved by calling retrieve(rawData,RAW_DATA_IDX).

FFMPEG is used to read videos. User can implement own demultiplexing with cudacodec::RawVideoSource
 */
CV_EXPORTS_W Ptr<VideoReader> createVideoReader(const String& filename, const std::vector<int>& params = {}, const bool rawMode = false);

/** @overload
@param source RAW video source implemented by user.
@param rawMode Allow the raw encoded data which has been read up until the last call to grab() to be retrieved by calling retrieve(rawData,RAW_DATA_IDX).
*/
CV_EXPORTS_W Ptr<VideoReader> createVideoReader(const Ptr<RawVideoSource>& source, const bool rawMode = false);

//! @}

}} // namespace cv { namespace cudacodec {

#endif /* OPENCV_CUDACODEC_HPP */