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43
44#include "precomp.hpp"
45
46#ifdef HAVE_NVCUVID
47
48void cv::cudacodec::detail::VideoDecoder::create(const FormatInfo& videoFormat)
49{
50    release();
51
52    cudaVideoCodec _codec = static_cast<cudaVideoCodec>(videoFormat.codec);
53    cudaVideoChromaFormat _chromaFormat = static_cast<cudaVideoChromaFormat>(videoFormat.chromaFormat);
54
55    cudaVideoCreateFlags videoCreateFlags = (_codec == cudaVideoCodec_JPEG || _codec == cudaVideoCodec_MPEG2) ?
56                                            cudaVideoCreate_PreferCUDA :
57                                            cudaVideoCreate_PreferCUVID;
58
59    // Validate video format.  These are the currently supported formats via NVCUVID
60    CV_Assert(cudaVideoCodec_MPEG1 == _codec ||
61              cudaVideoCodec_MPEG2 == _codec ||
62              cudaVideoCodec_MPEG4 == _codec ||
63              cudaVideoCodec_VC1   == _codec ||
64              cudaVideoCodec_H264  == _codec ||
65              cudaVideoCodec_JPEG  == _codec ||
66              cudaVideoCodec_YUV420== _codec ||
67              cudaVideoCodec_YV12  == _codec ||
68              cudaVideoCodec_NV12  == _codec ||
69              cudaVideoCodec_YUYV  == _codec ||
70              cudaVideoCodec_UYVY  == _codec );
71
72    CV_Assert(cudaVideoChromaFormat_Monochrome == _chromaFormat ||
73              cudaVideoChromaFormat_420        == _chromaFormat ||
74              cudaVideoChromaFormat_422        == _chromaFormat ||
75              cudaVideoChromaFormat_444        == _chromaFormat);
76
77    // Fill the decoder-create-info struct from the given video-format struct.
78    std::memset(&createInfo_, 0, sizeof(CUVIDDECODECREATEINFO));
79
80    // Create video decoder
81    createInfo_.CodecType           = _codec;
82    createInfo_.ulWidth             = videoFormat.width;
83    createInfo_.ulHeight            = videoFormat.height;
84    createInfo_.ulNumDecodeSurfaces = FrameQueue::MaximumSize;
85
86    // Limit decode memory to 24MB (16M pixels at 4:2:0 = 24M bytes)
87    while (createInfo_.ulNumDecodeSurfaces * videoFormat.width * videoFormat.height > 16 * 1024 * 1024)
88        createInfo_.ulNumDecodeSurfaces--;
89
90    createInfo_.ChromaFormat    = _chromaFormat;
91    createInfo_.OutputFormat    = cudaVideoSurfaceFormat_NV12;
92    createInfo_.DeinterlaceMode = cudaVideoDeinterlaceMode_Adaptive;
93
94    // No scaling
95    static const int MAX_FRAME_COUNT = 2;
96
97    createInfo_.ulTargetWidth       = createInfo_.ulWidth;
98    createInfo_.ulTargetHeight      = createInfo_.ulHeight;
99    createInfo_.ulNumOutputSurfaces = MAX_FRAME_COUNT;  // We won't simultaneously map more than 8 surfaces
100    createInfo_.ulCreationFlags     = videoCreateFlags;
101    createInfo_.vidLock = lock_;
102
103    // create the decoder
104    cuSafeCall( cuvidCreateDecoder(&decoder_, &createInfo_) );
105}
106
107void cv::cudacodec::detail::VideoDecoder::release()
108{
109    if (decoder_)
110    {
111        cuvidDestroyDecoder(decoder_);
112        decoder_ = 0;
113    }
114}
115
116#endif // HAVE_NVCUVID
117