1 /* 2 Copyright (C) 2001 Paul Davis 3 Copyright (C) 2004-2008 Grame 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as published by 7 the Free Software Foundation; either version 2.1 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 21 #ifndef __JackFrameTimer__ 22 #define __JackFrameTimer__ 23 24 #include "JackAtomicState.h" 25 #include "JackCompilerDeps.h" 26 #include "types.h" 27 28 namespace Jack 29 { 30 31 /*! 32 \brief A structure used for time management. 33 */ 34 35 PRE_PACKED_STRUCTURE 36 class SERVER_EXPORT JackTimer 37 { 38 39 friend class JackFrameTimer; 40 41 private: 42 43 jack_nframes_t fFrames; 44 jack_time_t fCurrentWakeup; 45 jack_time_t fCurrentCallback; 46 jack_time_t fNextWakeUp; 47 float fPeriodUsecs; 48 float fFilterOmega; /* set once, never altered */ 49 bool fInitialized; 50 51 public: 52 53 JackTimer(); ~JackTimer()54 ~JackTimer() 55 {} 56 57 jack_nframes_t Time2Frames(jack_time_t time, jack_nframes_t buffer_size); 58 jack_time_t Frames2Time(jack_nframes_t frames, jack_nframes_t buffer_size); 59 jack_nframes_t FramesSinceCycleStart(jack_time_t cur_time, jack_nframes_t frames_rate); 60 int GetCycleTimes(jack_nframes_t* current_frames, jack_time_t* current_usecs, jack_time_t* next_usecs, float* period_usecs); 61 CurFrame()62 jack_nframes_t CurFrame() 63 { 64 return fFrames; 65 } 66 CurTime()67 jack_time_t CurTime() 68 { 69 return fCurrentWakeup; 70 } 71 72 } POST_PACKED_STRUCTURE; 73 74 /*! 75 \brief A class using the JackAtomicState to manage jack time. 76 */ 77 78 PRE_PACKED_STRUCTURE 79 class SERVER_EXPORT JackFrameTimer : public JackAtomicState<JackTimer> 80 { 81 82 private: 83 84 bool fFirstWakeUp; 85 void IncFrameTimeAux(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs); 86 void InitFrameTimeAux(jack_time_t callback_usecs, jack_time_t period_usecs); 87 88 public: 89 JackFrameTimer()90 JackFrameTimer(): fFirstWakeUp(true) 91 {} ~JackFrameTimer()92 ~JackFrameTimer() 93 {} 94 95 void InitFrameTime(); 96 void ResetFrameTime(jack_time_t callback_usecs); 97 void IncFrameTime(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs); 98 void ReadFrameTime(JackTimer* timer); 99 100 } POST_PACKED_STRUCTURE; 101 102 103 } // end of namespace 104 105 #endif 106