Jack2  1.9.10
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 
26 namespace Jack
27 {
28 
29 #define DEFAULT_RB_SIZE 32768
30 #define DEFAULT_ADAPTATIVE_SIZE 2048
31 
32 inline float Range(float min, float max, float val)
33 {
34  return (val < min) ? min : ((val > max) ? max : val);
35 }
36 
42 {
43 
44  protected:
45 
46  jack_ringbuffer_t* fRingBuffer;
47  unsigned int fRingBufferSize;
48 
49  public:
50 
51  JackRingBuffer(int size = DEFAULT_RB_SIZE);
52  virtual ~JackRingBuffer();
53 
54  virtual void Reset(unsigned int new_size);
55 
56  // in frames
57  virtual unsigned int Read(jack_default_audio_sample_t* buffer, unsigned int frames);
58  virtual unsigned int Write(jack_default_audio_sample_t* buffer, unsigned int frames);
59 
60  // in bytes
61  virtual unsigned int Read(void* buffer, unsigned int bytes);
62  virtual unsigned int Write(void* buffer, unsigned int bytes);
63 
64  // in frames
65  virtual unsigned int ReadSpace();
66  virtual unsigned int WriteSpace();
67 
68  unsigned int GetError()
69  {
70  return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float)) - (fRingBufferSize / 2);
71  }
72 
73 };
74 
80 {
81 
82  protected:
83 
84  double fRatio;
85 
86  public:
87 
88  JackResampler():JackRingBuffer(),fRatio(1)
89  {}
90  virtual ~JackResampler()
91  {}
92 
93  virtual unsigned int ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames);
94  virtual unsigned int WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames);
95 
96  void SetRatio(double ratio)
97  {
98  fRatio = Range(0.25, 4.0, ratio);
99  }
100 
101  double GetRatio()
102  {
103  return fRatio;
104  }
105 
106  };
107 }
108 
109 #endif
Base class for RingBuffer in frames.
Definition: JackResampler.h:41
size_t jack_ringbuffer_read_space(const jack_ringbuffer_t *rb)
Base class for Resampler.
Definition: JackResampler.h:79