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//                          License Agreement
//                For Open Source Computer Vision Library
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#ifndef __VIDEO_PARSER_H__
#define __VIDEO_PARSER_H__

#include "precomp.hpp"

#include "frame_queue.h"
#include "video_decoder.h"

#if defined(HAVE_CUDA) && !defined(__APPLE__)

namespace cv { namespace gpu 
{
    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:
            VideoParser(const VideoParser&);
            VideoParser& operator =(const VideoParser&);

            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 // HAVE_CUDA

#endif // __VIDEO_PARSER_H__