Jack2 1.9.12

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
41 class JackRingBuffer
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
79 class JackResampler : public JackRingBuffer
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
ringbuffer.h
Jack::JackRingBuffer
Base class for RingBuffer in frames.
Definition: JackResampler.h:41
jack_ringbuffer_read_space
size_t jack_ringbuffer_read_space(const jack_ringbuffer_t *rb)
Jack::JackResampler
Base class for Resampler.
Definition: JackResampler.h:79
jack_ringbuffer_t
Definition: ringbuffer.h:51