Jack2  1.9.8
JackFrameTimer.h
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 
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 fSecondOrderIntegrator;
48  float fFilterCoefficient; /* set once, never altered */
49  bool fInitialized;
50 
51  public:
52 
53  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 
61  jack_nframes_t CurFrame()
62  {
63  return fFrames;
64  }
65 
66  jack_time_t CurTime()
67  {
68  return fCurrentWakeup;
69  }
70 
71 } POST_PACKED_STRUCTURE;
72 
77 PRE_PACKED_STRUCTURE
78 class SERVER_EXPORT JackFrameTimer : public JackAtomicState<JackTimer>
79 {
80 
81  private:
82 
83  bool fFirstWakeUp;
84  void IncFrameTimeAux(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
85  void InitFrameTimeAux(jack_time_t callback_usecs, jack_time_t period_usecs);
86 
87  public:
88 
89  JackFrameTimer(): fFirstWakeUp(true)
90  {}
92  {}
93 
94  void InitFrameTime();
95  void ResetFrameTime(jack_nframes_t frames_rate, jack_time_t callback_usecs, jack_time_t period_usecs);
96  void IncFrameTime(jack_nframes_t buffer_size, jack_time_t callback_usecs, jack_time_t period_usecs);
97  void ReadFrameTime(JackTimer* timer);
98 
99 } POST_PACKED_STRUCTURE;
100 
101 
102 } // end of namespace
103 
104 #endif