Jack2 1.9.6

JackFrameTimer.h

00001 /*
00002 Copyright (C) 2001 Paul Davis
00003 Copyright (C) 2004-2008 Grame
00004 
00005 This program is free software; you can redistribute it and/or modify
00006 it under the terms of the GNU Lesser General Public License as published by
00007 the Free Software Foundation; either version 2.1 of the License, or
00008 (at your option) any later version.
00009 
00010 This program is distributed in the hope that it will be useful,
00011 but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 GNU Lesser General Public License for more details.
00014 
00015 You should have received a copy of the GNU Lesser General Public License
00016 along with this program; if not, write to the Free Software 
00017 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00018 
00019 */
00020 
00021 #ifndef __JackFrameTimer__
00022 #define __JackFrameTimer__
00023 
00024 #include "JackAtomicState.h"
00025 #include "JackCompilerDeps.h"
00026 #include "types.h"
00027 
00028 namespace Jack
00029 {
00030 
00035 class SERVER_EXPORT JackTimer
00036 {
00037 
00038     friend class JackFrameTimer;
00039     
00040     private: 
00041     
00042         jack_nframes_t fFrames;
00043         jack_time_t     fCurrentWakeup;
00044         jack_time_t     fCurrentCallback;
00045         jack_time_t     fNextWakeUp;
00046         float fSecondOrderIntegrator;
00047         float fFilterCoefficient;       /* set once, never altered */
00048         bool fInitialized;
00049 
00050     public: 
00051     
00052         JackTimer();
00053         ~JackTimer()
00054         {}
00055         
00056         jack_nframes_t Time2Frames(jack_time_t time, jack_nframes_t buffer_size);
00057         jack_time_t Frames2Time(jack_nframes_t frames, jack_nframes_t buffer_size);
00058         jack_nframes_t FramesSinceCycleStart(jack_time_t cur_time, jack_nframes_t frames_rate);
00059         
00060         jack_nframes_t CurFrame()
00061         {
00062             return fFrames;
00063         }
00064         
00065         jack_time_t CurTime()
00066         {
00067             return fCurrentWakeup;
00068         }
00069 
00070 } POST_PACKED_STRUCTURE;
00071 
00076 class SERVER_EXPORT JackFrameTimer : public JackAtomicState<JackTimer>
00077 {
00078     
00079     private:
00080 
00081         bool fFirstWakeUp;
00082         void IncFrameTimeAux(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
00083         void InitFrameTimeAux(jack_time_t callback_usecs, jack_time_t period_usecs);
00084 
00085     public:
00086 
00087         JackFrameTimer(): fFirstWakeUp(true)
00088         {}
00089         ~JackFrameTimer()
00090         {}
00091 
00092         void InitFrameTime();
00093         void ResetFrameTime(jack_nframes_t frames_rate, jack_time_t callback_usecs, jack_time_t period_usecs);
00094         void IncFrameTime(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
00095         void ReadFrameTime(JackTimer* timer);
00096         
00097 } POST_PACKED_STRUCTURE;
00098 
00099 
00100 } // end of namespace
00101 
00102 #endif