video_decoder.h

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#ifndef __VIDEO_DECODER_H__
#define __VIDEO_DECODER_H__

#include "precomp.hpp"

#if defined(HAVE_CUDA) && defined(HAVE_NVCUVID)

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

            ~VideoDecoder()
            {
                release();
            }

            void create(const VideoReader_GPU::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;
            }

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

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

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

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

        private:
            VideoDecoder(const VideoDecoder&);
            VideoDecoder& operator =(const VideoDecoder&);

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

#endif // HAVE_CUDA

#endif // __VIDEO_DECODER_H__