JackFrameTimer.h
/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __JackFrameTimer__
#define __JackFrameTimer__
#include "JackAtomicState.h"
#include "JackCompilerDeps.h"
#include "types.h"
namespace Jack
{
PRE_PACKED_STRUCTURE
class SERVER_EXPORT JackTimer
{
friend class JackFrameTimer;
private:
jack_nframes_t fFrames;
jack_time_t fCurrentWakeup;
jack_time_t fCurrentCallback;
jack_time_t fNextWakeUp;
float fPeriodUsecs;
float fFilterOmega; /* set once, never altered */
bool fInitialized;
public:
JackTimer();
~JackTimer()
{}
jack_nframes_t Time2Frames(jack_time_t time, jack_nframes_t buffer_size);
jack_time_t Frames2Time(jack_nframes_t frames, jack_nframes_t buffer_size);
jack_nframes_t FramesSinceCycleStart(jack_time_t cur_time, jack_nframes_t frames_rate);
int GetCycleTimes(jack_nframes_t* current_frames, jack_time_t* current_usecs, jack_time_t* next_usecs, float* period_usecs);
jack_nframes_t CurFrame()
{
return fFrames;
}
jack_time_t CurTime()
{
return fCurrentWakeup;
}
} POST_PACKED_STRUCTURE;
PRE_PACKED_STRUCTURE
class SERVER_EXPORT JackFrameTimer : public JackAtomicState<JackTimer>
{
private:
bool fFirstWakeUp;
void IncFrameTimeAux(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
void InitFrameTimeAux(jack_time_t callback_usecs, jack_time_t period_usecs);
public:
JackFrameTimer(): fFirstWakeUp(true)
{}
~JackFrameTimer()
{}
void InitFrameTime();
void ResetFrameTime(jack_time_t callback_usecs);
void IncFrameTime(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
void ReadFrameTime(JackTimer* timer);
} POST_PACKED_STRUCTURE;
} // end of namespace
#endif
Jack::JackTimer
A structure used for time management.
Definition: JackFrameTimer.h:36
Jack
Definition: JackAC3Encoder.cpp:30
Jack::JackAtomicState
A class to handle two states (switching from one to the other) in a lock-free manner.
Definition: JackAtomicState.h:90
Jack::JackFrameTimer
A class using the JackAtomicState to manage jack time.
Definition: JackFrameTimer.h:79