1 /*M///////////////////////////////////////////////////////////////////////////////////////
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7 // copy or use the software.
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9 //
10 // License Agreement
11 // For Open Source Computer Vision Library
12 //
13 // Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
14 // Copyright (C) 2009, Willow Garage Inc., all rights reserved.
15 // Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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42 //M*/
43
44 #include "precomp.hpp"
45
46 #ifdef HAVE_NVCUVID
47
FrameQueue()48 cv::cudacodec::detail::FrameQueue::FrameQueue() :
49 endOfDecode_(0),
50 framesInQueue_(0),
51 readPosition_(0)
52 {
53 std::memset(displayQueue_, 0, sizeof(displayQueue_));
54 std::memset((void*) isFrameInUse_, 0, sizeof(isFrameInUse_));
55 }
56
waitUntilFrameAvailable(int pictureIndex)57 bool cv::cudacodec::detail::FrameQueue::waitUntilFrameAvailable(int pictureIndex)
58 {
59 while (isInUse(pictureIndex))
60 {
61 // Decoder is getting too far ahead from display
62 Thread::sleep(1);
63
64 if (isEndOfDecode())
65 return false;
66 }
67
68 return true;
69 }
70
enqueue(const CUVIDPARSERDISPINFO * picParams)71 void cv::cudacodec::detail::FrameQueue::enqueue(const CUVIDPARSERDISPINFO* picParams)
72 {
73 // Mark the frame as 'in-use' so we don't re-use it for decoding until it is no longer needed
74 // for display
75 isFrameInUse_[picParams->picture_index] = true;
76
77 // Wait until we have a free entry in the display queue (should never block if we have enough entries)
78 do
79 {
80 bool isFramePlaced = false;
81
82 {
83 AutoLock autoLock(mtx_);
84
85 if (framesInQueue_ < MaximumSize)
86 {
87 int writePosition = (readPosition_ + framesInQueue_) % MaximumSize;
88 displayQueue_[writePosition] = *picParams;
89 framesInQueue_++;
90 isFramePlaced = true;
91 }
92 }
93
94 if (isFramePlaced) // Done
95 break;
96
97 // Wait a bit
98 Thread::sleep(1);
99 } while (!isEndOfDecode());
100 }
101
dequeue(CUVIDPARSERDISPINFO & displayInfo)102 bool cv::cudacodec::detail::FrameQueue::dequeue(CUVIDPARSERDISPINFO& displayInfo)
103 {
104 AutoLock autoLock(mtx_);
105
106 if (framesInQueue_ > 0)
107 {
108 int entry = readPosition_;
109 displayInfo = displayQueue_[entry];
110 readPosition_ = (entry + 1) % MaximumSize;
111 framesInQueue_--;
112 return true;
113 }
114
115 return false;
116 }
117
118 #endif // HAVE_NVCUVID
119