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#ifndef __VIDEO_PARSER_HPP__
#define __VIDEO_PARSER_HPP__

#include <nvcuvid.h>

#include "opencv2/core/private.cuda.hpp"
#include "opencv2/cudacodec.hpp"
#include "frame_queue.hpp"
#include "video_decoder.hpp"

namespace cv { namespace cudacodec { namespace detail
{

class VideoParser
{
public:
    VideoParser(VideoDecoder* videoDecoder, FrameQueue* frameQueue);

    ~VideoParser()
    {
        cuvidDestroyVideoParser(parser_);
    }

    bool parseVideoData(const unsigned char* data, size_t size, bool endOfStream);

    bool hasError() const { return hasError_; }

private:
    VideoDecoder* videoDecoder_;
    FrameQueue* frameQueue_;
    CUvideoparser parser_;
    int unparsedPackets_;
    volatile bool hasError_;

    // Called when the decoder encounters a video format change (or initial sequence header)
    // This particular implementation of the callback returns 0 in case the video format changes
    // to something different than the original format. Returning 0 causes a stop of the app.
    static int CUDAAPI HandleVideoSequence(void* pUserData, CUVIDEOFORMAT* pFormat);

    // Called by the video parser to decode a single picture
    // Since the parser will deliver data as fast as it can, we need to make sure that the picture
    // index we're attempting to use for decode is no longer used for display
    static int CUDAAPI HandlePictureDecode(void* pUserData, CUVIDPICPARAMS* pPicParams);

    // Called by the video parser to display a video frame (in the case of field pictures, there may be
    // 2 decode calls per 1 display call, since two fields make up one frame)
    static int CUDAAPI HandlePictureDisplay(void* pUserData, CUVIDPARSERDISPINFO* pPicParams);
};

}}}

#endif // __VIDEO_PARSER_HPP__
