Jack2  1.9.8
JackResampler.h
1 /*
2 Copyright (C) 2008 Grame
3 
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8 
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 
18 */
19 
20 #ifndef __JackResampler__
21 #define __JackResampler__
22 
23 #include "ringbuffer.h"
24 #include "types.h"
25 #include "JackError.h"
26 
27 namespace Jack
28 {
29 
30 #define DEFAULT_RB_SIZE 32768
31 #define DEFAULT_ADAPTATIVE_SIZE 2048
32 
33 inline float Range(float min, float max, float val)
34 {
35  return (val < min) ? min : ((val > max) ? max : val);
36 }
37 
43 {
44 
45  protected:
46 
47  jack_ringbuffer_t* fRingBuffer;
48  double fRatio;
49  unsigned int fRingBufferSize;
50 
51  public:
52 
53  JackResampler();
54  virtual ~JackResampler();
55 
56  virtual void Reset(unsigned int new_size);
57 
58  virtual unsigned int ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames);
59  virtual unsigned int WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames);
60 
61  virtual unsigned int Read(jack_default_audio_sample_t* buffer, unsigned int frames);
62  virtual unsigned int Write(jack_default_audio_sample_t* buffer, unsigned int frames);
63 
64  virtual unsigned int Read(void* buffer, unsigned int bytes);
65  virtual unsigned int Write(void* buffer, unsigned int bytes);
66 
67  virtual unsigned int ReadSpace();
68  virtual unsigned int WriteSpace();
69 
70  unsigned int GetError()
71  {
72  return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float)) - (fRingBufferSize / 2);
73  }
74 
75  void SetRatio(double ratio)
76  {
77  fRatio = Range(0.25, 4.0, ratio);
78  }
79 
80  double GetRatio()
81  {
82  return fRatio;
83  }
84 
85  };
86 }
87 
88 #endif