1 /*M///////////////////////////////////////////////////////////////////////////////////////
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10 // License Agreement
11 // For Open Source Computer Vision Library
12 //
13 // Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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42 //M*/
43
44 #include "precomp.hpp"
45
46 #ifdef HAVE_NVCUVID
47
create(const FormatInfo & videoFormat)48 void 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
release()107 void cv::cudacodec::detail::VideoDecoder::release()
108 {
109 if (decoder_)
110 {
111 cuvidDestroyDecoder(decoder_);
112 decoder_ = 0;
113 }
114 }
115
116 #endif // HAVE_NVCUVID
117