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#ifndef __VIDEO_DECODER_HPP__
#define __VIDEO_DECODER_HPP__

#include <nvcuvid.h>

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

namespace cv { namespace cudacodec { namespace detail
{

class VideoDecoder
{
public:
    VideoDecoder(const FormatInfo& videoFormat, CUvideoctxlock lock) : lock_(lock), decoder_(0)
    {
        create(videoFormat);
    }

    ~VideoDecoder()
    {
        release();
    }

    void create(const FormatInfo& videoFormat);
    void release();

    // Get the code-type currently used.
    cudaVideoCodec codec() const { return createInfo_.CodecType; }
    unsigned long maxDecodeSurfaces() const { return createInfo_.ulNumDecodeSurfaces; }

    unsigned long frameWidth() const { return createInfo_.ulWidth; }
    unsigned long frameHeight() const { return createInfo_.ulHeight; }

    unsigned long targetWidth() const { return createInfo_.ulTargetWidth; }
    unsigned long targetHeight() const { return createInfo_.ulTargetHeight; }

    cudaVideoChromaFormat chromaFormat() const { return createInfo_.ChromaFormat; }

    bool decodePicture(CUVIDPICPARAMS* picParams)
    {
        return cuvidDecodePicture(decoder_, picParams) == CUDA_SUCCESS;
    }

    cuda::GpuMat mapFrame(int picIdx, CUVIDPROCPARAMS& videoProcParams)
    {
        CUdeviceptr ptr;
        unsigned int pitch;

        cuSafeCall( cuvidMapVideoFrame(decoder_, picIdx, &ptr, &pitch, &videoProcParams) );

        return cuda::GpuMat(targetHeight() * 3 / 2, targetWidth(), CV_8UC1, (void*) ptr, pitch);
    }

    void unmapFrame(cuda::GpuMat& frame)
    {
        cuSafeCall( cuvidUnmapVideoFrame(decoder_, (CUdeviceptr) frame.data) );
        frame.release();
    }

private:
    CUvideoctxlock lock_;
    CUVIDDECODECREATEINFO createInfo_;
    CUvideodecoder        decoder_;
};

}}}

#endif // __VIDEO_DECODER_HPP__
