src/add-ons/media/media-add-ons/multi_audio/TimeComputer.h

   1 /*
   2  * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef TIME_COMPUTER_H
   6 #define TIME_COMPUTER_H
   7
   8
   9 #include <SupportDefs.h>
  10
  11
  12 struct TimeComputer {
  13                                                                 TimeComputer();
  14
  15                         void                            Init(float frameRate, bigtime_t realBaseTime);
  16                         void                            SetFrameRate(float frameRate);
  17
  18                         void                            AddTimeStamp(bigtime_t realTime, uint64 frames);
  19
  20                         bigtime_t                       RealTime() const        { return fRealTime; }
  21                         bigtime_t                       PerformanceTime() const
  22                                                                         { return fPerformanceTime; }
  23                         double                          Drift() const           { return fDrift; }
  24
  25 private:
  26         static  const int32                     kEntryCount = 32;
  27
  28                         struct Entry {
  29                                 bigtime_t       realTime;
  30                                 bigtime_t       performanceTime;
  31                         };
  32
  33 private:
  34                         void                            _AddEntry(bigtime_t realTime,
  35                                                                         bigtime_t performanceTime);
  36
  37 private:
  38                         bigtime_t                       fRealTime;
  39                         bigtime_t                       fPerformanceTime;
  40                         double                          fDrift;
  41                         float                           fFrameRate;
  42                         double                          fUsecsPerFrame;
  43                         bigtime_t                       fPerformanceTimeBase;
  44                         uint64                          fFrameBase;
  45                         bool                            fResetTimeBase;
  46                         Entry                           fEntries[kEntryCount];
  47                         int32                           fFirstEntry;
  48                         int32                           fLastEntry;
  49 };
  50
  51
  52 #endif  // TIME_COMPUTER_H