Jack2  1.9.9
JackResampler.cpp
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 #include "JackResampler.h"
21 #include "JackError.h"
22 #include <stdio.h>
23 
24 namespace Jack
25 {
26 
27 JackResampler::JackResampler()
28  :fRatio(1), fRingBufferSize(DEFAULT_RB_SIZE)
29 {
30  fRingBuffer = jack_ringbuffer_create(sizeof(jack_default_audio_sample_t) * fRingBufferSize);
31  jack_ringbuffer_read_advance(fRingBuffer, (sizeof(jack_default_audio_sample_t) * fRingBufferSize) / 2);
32 }
33 
34 JackResampler::~JackResampler()
35 {
36  if (fRingBuffer) {
37  jack_ringbuffer_free(fRingBuffer);
38  }
39 }
40 
41 void JackResampler::Reset(unsigned int new_size)
42 {
43  fRingBufferSize = new_size;
44  jack_ringbuffer_reset(fRingBuffer);
45  jack_ringbuffer_reset_size(fRingBuffer, sizeof(jack_default_audio_sample_t) * fRingBufferSize);
46  jack_ringbuffer_read_advance(fRingBuffer, (sizeof(jack_default_audio_sample_t) * fRingBufferSize / 2));
47 }
48 
49 unsigned int JackResampler::ReadSpace()
50 {
51  return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
52 }
53 
54 unsigned int JackResampler::WriteSpace()
55 {
56  return (jack_ringbuffer_write_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
57 }
58 
59 unsigned int JackResampler::Read(jack_default_audio_sample_t* buffer, unsigned int frames)
60 {
61  size_t len = jack_ringbuffer_read_space(fRingBuffer);
62  jack_log("JackResampler::Read input available = %ld", len / sizeof(jack_default_audio_sample_t));
63 
64  if (len < frames * sizeof(jack_default_audio_sample_t)) {
65  jack_error("JackResampler::Read : producer too slow, missing frames = %d", frames);
66  return 0;
67  } else {
68  jack_ringbuffer_read(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
69  return frames;
70  }
71 }
72 
73 unsigned int JackResampler::Write(jack_default_audio_sample_t* buffer, unsigned int frames)
74 {
75  size_t len = jack_ringbuffer_write_space(fRingBuffer);
76  jack_log("JackResampler::Write output available = %ld", len / sizeof(jack_default_audio_sample_t));
77 
78  if (len < frames * sizeof(jack_default_audio_sample_t)) {
79  jack_error("JackResampler::Write : consumer too slow, skip frames = %d", frames);
80  return 0;
81  } else {
82  jack_ringbuffer_write(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
83  return frames;
84  }
85 }
86 
87 unsigned int JackResampler::Read(void* buffer, unsigned int bytes)
88 {
89  size_t len = jack_ringbuffer_read_space(fRingBuffer);
90  jack_log("JackResampler::Read input available = %ld", len);
91 
92  if (len < bytes) {
93  jack_error("JackResampler::Read : producer too slow, missing bytes = %d", bytes);
94  return 0;
95  } else {
96  jack_ringbuffer_read(fRingBuffer, (char*)buffer, bytes);
97  return bytes;
98  }
99 }
100 
101 unsigned int JackResampler::Write(void* buffer, unsigned int bytes)
102 {
103  size_t len = jack_ringbuffer_write_space(fRingBuffer);
104  jack_log("JackResampler::Write output available = %ld", len);
105 
106  if (len < bytes) {
107  jack_error("JackResampler::Write : consumer too slow, skip bytes = %d", bytes);
108  return 0;
109  } else {
110  jack_ringbuffer_write(fRingBuffer, (char*)buffer, bytes);
111  return bytes;
112  }
113 }
114 
115 unsigned int JackResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
116 {
117  return Read(buffer, frames);
118 }
119 
120 unsigned int JackResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
121 {
122  return Write(buffer, frames);
123 }
124 
125 }
size_t jack_ringbuffer_read_space(const jack_ringbuffer_t *rb)
jack_ringbuffer_t * jack_ringbuffer_create(size_t sz)
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:91
size_t jack_ringbuffer_write_space(const jack_ringbuffer_t *rb)
void jack_ringbuffer_free(jack_ringbuffer_t *rb)
void jack_ringbuffer_reset(jack_ringbuffer_t *rb)
size_t jack_ringbuffer_write(jack_ringbuffer_t *rb, const char *src, size_t cnt)
void jack_ringbuffer_read_advance(jack_ringbuffer_t *rb, size_t cnt)
size_t jack_ringbuffer_read(jack_ringbuffer_t *rb, char *dest, size_t cnt)
void jack_ringbuffer_reset_size(jack_ringbuffer_t *rb, size_t sz)
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:107