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//!
//! \file     vp_frametracker.h
//! \brief    vp frame tracker.
//!
#ifndef __VP_FRAMETRACKER_H__
#define __VP_FRAMETRACKER_H__
#include <chrono>
#include <stack>
#include "mos_defs.h"
#include "vp_utils.h"

namespace vp
{
using Clock = std::chrono::high_resolution_clock;
using TimePoint = Clock::time_point;

#define FRAME_TRACING_BEGIN 2 //Skip first 2 frames. Tuning the value can change skipped frame
#define FRAME_TRACING_PERIOD 5 //Calbrate FPS with 5 frames, can enlarge/decrease calculation window
#define MAX_FRAME_TRACING (FRAME_TRACING_BEGIN + FRAME_TRACING_PERIOD + 1)
#define FPS60_THRESHOLD 33 // 60FPS threshold. Can tune this value according to different senario

class VpFrameTracker
{
public:
    VpFrameTracker();

    virtual ~VpFrameTracker()
    {
        m_startTimeQueue.clear();
    };

    virtual MOS_STATUS UpdateFPS();

    virtual bool Is60Fps();

    double GetFPS()
    {
        std::chrono::duration<double> elapsed = m_startTimeQueue.back() - m_startTimeQueue.front();

        if (m_startTimeQueue.size() != (FRAME_TRACING_PERIOD + 1))
        {
            VP_RENDER_ASSERTMESSAGE("Frame tracker queue size is not correct!");
            VP_RENDER_ASSERT(m_startTimeQueue.size() == (FRAME_TRACING_PERIOD + 1));
        }

        return ((1.0 / elapsed.count()) * FRAME_TRACING_PERIOD);
    }

protected:

    int                   m_numberOfFrames;
    std::deque<TimePoint> m_startTimeQueue;
    bool                  m_isEnabled = false;

MEDIA_CLASS_DEFINE_END(vp__VpFrameTracker)
};

}  // namespace vp
#endif  // !__VP_FRAMETRACKER_H__