xbmc/cores/VideoPlayer/VideoReferenceClock.h

   1 /*
   2  *  Copyright (C) 2005-2018 Team Kodi
   3  *  This file is part of Kodi - https://kodi.tv
   4  *
   5  *  SPDX-License-Identifier: GPL-2.0-or-later
   6  *  See LICENSES/README.md for more information.
   7  */
   8
   9 #pragma once
  10
  11 #include "threads/CriticalSection.h"
  12 #include "threads/Event.h"
  13 #include "threads/Thread.h"
  14
  15 #include <memory>
  16
  17 class CVideoSync;
  18
  19 class CVideoReferenceClock : CThread
  20 {
  21   public:
  22     CVideoReferenceClock();
  23     ~CVideoReferenceClock() override;
  24
  25     int64_t GetTime(bool interpolated = true);
  26     void    SetSpeed(double Speed);
  27     double  GetSpeed();
  28     double  GetRefreshRate(double* interval = nullptr);
  29     bool    GetClockInfo(int& MissedVblanks, double& ClockSpeed, double& RefreshRate) const;
  30
  31     void UpdateClock(int NrVBlanks, uint64_t time);
  32
  33   private:
  34     void    Process() override;
  35     void Start();
  36     void    UpdateRefreshrate();
  37     void UpdateClockInternal(int NrVBlanks, bool CheckMissed);
  38     double  UpdateInterval() const;
  39     int64_t TimeOfNextVblank() const;
  40
  41     int64_t m_CurrTime;          //the current time of the clock when using vblank as clock source
  42     int64_t m_LastIntTime;       //last interpolated clock value, to make sure the clock doesn't go backwards
  43     double  m_CurrTimeFract;     //fractional part that is lost due to rounding when updating the clock
  44     double  m_ClockSpeed;        //the frequency of the clock set by VideoPlayer
  45     int64_t m_SystemFrequency;   //frequency of the systemclock
  46
  47     bool    m_UseVblank;         //set to true when vblank is used as clock source
  48     double  m_RefreshRate;       //current refreshrate
  49     int     m_MissedVblanks;     //number of clock updates missed by the vblank clock
  50     int     m_TotalMissedVblanks;//total number of clock updates missed, used by codec information screen
  51     int64_t m_VblankTime;        //last time the clock was updated when using vblank as clock
  52
  53     CEvent m_vsyncStopEvent;
  54
  55     mutable CCriticalSection m_CritSection;
  56
  57     std::unique_ptr<CVideoSync> m_pVideoSync;
  58 };