xbmc/cores/VideoPlayer/PTSTracker.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 <string>
  12 #include <vector>
  13
  14 #define DIFFRINGSIZE 120
  15 #define VFR_DETECTION_THRESHOLD 3
  16 #define VFR_PATTERN_THRESHOLD 2
  17
  18 class CPtsTracker
  19 {
  20   public:
  21     CPtsTracker();
  22     void   Add(double pts);
  23     void   Flush(); //flush the saved pattern and the ringbuffer
  24     void   ResetVFRDetection(void);
  25
  26     int    GetPatternLength() { return m_patternlength;            }
  27     double GetFrameDuration() { return m_frameduration;            }
  28     double GetMaxFrameDuration(void) { return m_maxframeduration;  }
  29     double GetMinFrameDuration(void) { return m_minframeduration;  }
  30     bool   HasFullBuffer()    { return m_ringfill == DIFFRINGSIZE; }
  31     bool   VFRDetection(void) { return ((m_VFRCounter >= VFR_DETECTION_THRESHOLD) && (m_patternCounter >= VFR_PATTERN_THRESHOLD)); }
  32
  33   private:
  34     double m_prevpts;                //last pts added
  35     double m_diffring[DIFFRINGSIZE]; //ringbuffer of differences between pts'
  36     int    m_ringpos;                //position of last diff added to ringbuffer
  37     int    m_ringfill;               //how many diffs we have in the ringbuffer
  38     double GetDiff(int diffnr);      //gets diffs from now to the past
  39
  40     void GetPattern(std::vector<double>& pattern);     //gets the current pattern
  41
  42     static bool MatchDiff(double diff1, double diff2); //checks if two diffs match by MAXERR
  43     static bool MatchDifftype(int diffs1[], int diffs2[], int nrdiffs); //checks if the difftypes match
  44
  45     //checks if the current pattern matches with the saved m_pattern with offset m_patternpos
  46     bool CheckPattern(std::vector<double>& pattern);
  47
  48     double CalcFrameDuration(); //calculates the frame duration from m_pattern
  49
  50     std::vector<double> m_pattern, m_lastPattern; //the last saved pattern
  51     double m_frameduration;        //frameduration exposed to VideoPlayer, used for calculating the fps
  52     double m_maxframeduration;     //Max value detected for frame duration (for VFR files case)
  53     double m_minframeduration;     //Min value detected for frame duration (for VFR files case)
  54     bool m_haspattern;             //for the log and detecting VFR files case
  55     int m_patternlength;           //for the codec info
  56     int m_VFRCounter;              //retry counter for VFR detection
  57     int m_patternCounter;
  58     std::string GetPatternStr();   //also for the log
  59 };