1/*M///////////////////////////////////////////////////////////////////////////////////////
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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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43
44#include "precomp.hpp"
45
46#ifdef HAVE_NVCUVID
47
48cv::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
57bool 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
71void 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
102bool 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