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#ifndef __FRAME_QUEUE_HPP__
#define __FRAME_QUEUE_HPP__

#include "opencv2/core/utility.hpp"
#include "opencv2/core/private.cuda.hpp"

#include <nvcuvid.h>

namespace cv { namespace cudacodec { namespace detail
{

class FrameQueue
{
public:
    static const int MaximumSize = 20; // MAX_FRM_CNT;

    FrameQueue();

    void endDecode() { endOfDecode_ = true; }
    bool isEndOfDecode() const { return endOfDecode_ != 0;}

    // Spins until frame becomes available or decoding gets canceled.
    // If the requested frame is available the method returns true.
    // If decoding was interupted before the requested frame becomes
    // available, the method returns false.
    bool waitUntilFrameAvailable(int pictureIndex);

    void enqueue(const CUVIDPARSERDISPINFO* picParams);

    // Deque the next frame.
    // Parameters:
    //      displayInfo - New frame info gets placed into this object.
    // Returns:
    //      true, if a new frame was returned,
    //      false, if the queue was empty and no new frame could be returned.
    bool dequeue(CUVIDPARSERDISPINFO& displayInfo);

    void releaseFrame(const CUVIDPARSERDISPINFO& picParams) { isFrameInUse_[picParams.picture_index] = false; }

private:
    bool isInUse(int pictureIndex) const { return isFrameInUse_[pictureIndex] != 0; }

    Mutex mtx_;

    volatile int isFrameInUse_[MaximumSize];
    volatile int endOfDecode_;

    int framesInQueue_;
    int readPosition_;
    CUVIDPARSERDISPINFO displayQueue_[MaximumSize];
};

}}}

#endif // __FRAME_QUEUE_HPP__
