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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 {

//! @addtogroup cudacodec
//! @{

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

// Works only under Windows.
// Supports olny 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 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 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).
     */
    virtual void onBeginFrame(int frameNumber, 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).
     */
    virtual void onEndFrame(int frameNumber, 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 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.
     */
    virtual void write(InputArray frame, bool lastFrame = false) = 0;

    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 Ptr<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 Ptr<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 Ptr<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 Ptr<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,

    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
};

/** @brief Struct providing information about video file format. :
 */
struct FormatInfo
{
    Codec codec;
    ChromaFormat chromaFormat;
    int width;
    int height;
};

/** @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 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.
     */
    virtual bool nextFrame(OutputArray frame) = 0;

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

/** @brief Interface for video demultiplexing. :

User can implement own demultiplexing by implementing this interface.
 */
class CV_EXPORTS 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.
    @param endOfFile Indicates that it is end of stream.
     */
    virtual bool getNextPacket(unsigned char** data, int* size, bool* endOfFile) = 0;

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

/** @brief Creates video reader.

@param filename Name of the input video file.

FFMPEG is used to read videos. User can implement own demultiplexing with cudacodec::RawVideoSource
 */
CV_EXPORTS Ptr<VideoReader> createVideoReader(const String& filename);
/** @overload
@param source RAW video source implemented by user.
*/
CV_EXPORTS Ptr<VideoReader> createVideoReader(const Ptr<RawVideoSource>& source);

//! @}

}} // namespace cv { namespace cudacodec {

#endif /* __OPENCV_CUDACODEC_HPP__ */
