Jack2  1.9.12
JackLibSampleRateResampler.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 "JackLibSampleRateResampler.h"
21 #include "JackError.h"
22 
23 namespace Jack
24 {
25 
26 JackLibSampleRateResampler::JackLibSampleRateResampler()
27  :JackResampler()
28 {
29  int error;
30  fResampler = src_new(SRC_LINEAR, 1, &error);
31  if (error != 0) {
32  jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
33  }
34 }
35 
36 JackLibSampleRateResampler::JackLibSampleRateResampler(unsigned int quality)
37  :JackResampler()
38 {
39  switch (quality) {
40  case 0:
41  quality = SRC_LINEAR;
42  break;
43  case 1:
44  quality = SRC_ZERO_ORDER_HOLD;
45  break;
46  case 2:
47  quality = SRC_SINC_FASTEST;
48  break;
49  case 3:
50  quality = SRC_SINC_MEDIUM_QUALITY;
51  break;
52  case 4:
53  quality = SRC_SINC_BEST_QUALITY;
54  break;
55  default:
56  quality = SRC_LINEAR;
57  jack_error("Out of range resample quality");
58  break;
59  }
60 
61  int error;
62  fResampler = src_new(quality, 1, &error);
63  if (error != 0) {
64  jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
65  }
66 }
67 
68 JackLibSampleRateResampler::~JackLibSampleRateResampler()
69 {
70  src_delete(fResampler);
71 }
72 
73 void JackLibSampleRateResampler::Reset(unsigned int new_size)
74 {
75  JackResampler::Reset(new_size);
76  src_reset(fResampler);
77 }
78 
79 unsigned int JackLibSampleRateResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
80 {
81  jack_ringbuffer_data_t ring_buffer_data[2];
82  SRC_DATA src_data;
83  unsigned int frames_to_write = frames;
84  unsigned int written_frames = 0;
85  int res;
86 
87  jack_ringbuffer_get_read_vector(fRingBuffer, ring_buffer_data);
88  unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
89  jack_log("Output available = %ld", available_frames);
90 
91  for (int j = 0; j < 2; j++) {
92 
93  if (ring_buffer_data[j].len > 0) {
94 
95  src_data.data_in = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
96  src_data.data_out = &buffer[written_frames];
97  src_data.input_frames = ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t);
98  src_data.output_frames = frames_to_write;
99  src_data.end_of_input = 0;
100  src_data.src_ratio = fRatio;
101 
102  res = src_process(fResampler, &src_data);
103  if (res != 0) {
104  jack_error("JackLibSampleRateResampler::ReadResample ratio = %f err = %s", fRatio, src_strerror(res));
105  return 0;
106  }
107 
108  frames_to_write -= src_data.output_frames_gen;
109  written_frames += src_data.output_frames_gen;
110 
111  if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
112  jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
113  , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
114  }
115 
116  jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
117  jack_ringbuffer_read_advance(fRingBuffer, src_data.input_frames_used * sizeof(jack_default_audio_sample_t));
118  }
119  }
120 
121  if (written_frames < frames) {
122  jack_error("Output available = %ld", available_frames);
123  jack_error("JackLibSampleRateResampler::ReadResample error written_frames = %ld", written_frames);
124  }
125 
126  return written_frames;
127 }
128 
129 unsigned int JackLibSampleRateResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
130 {
131  jack_ringbuffer_data_t ring_buffer_data[2];
132  SRC_DATA src_data;
133  unsigned int frames_to_read = frames;
134  unsigned int read_frames = 0;
135  int res;
136 
137  jack_ringbuffer_get_write_vector(fRingBuffer, ring_buffer_data);
138  unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
139  jack_log("Input available = %ld", available_frames);
140 
141  for (int j = 0; j < 2; j++) {
142 
143  if (ring_buffer_data[j].len > 0) {
144 
145  src_data.data_in = &buffer[read_frames];
146  src_data.data_out = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
147  src_data.input_frames = frames_to_read;
148  src_data.output_frames = (ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t));
149  src_data.end_of_input = 0;
150  src_data.src_ratio = fRatio;
151 
152  res = src_process(fResampler, &src_data);
153  if (res != 0) {
154  jack_error("JackLibSampleRateResampler::WriteResample ratio = %f err = %s", fRatio, src_strerror(res));
155  return 0;
156  }
157 
158  frames_to_read -= src_data.input_frames_used;
159  read_frames += src_data.input_frames_used;
160 
161  if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
162  jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
163  , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
164  }
165 
166  jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
167  jack_ringbuffer_write_advance(fRingBuffer, src_data.output_frames_gen * sizeof(jack_default_audio_sample_t));
168  }
169  }
170 
171  if (read_frames < frames) {
172  jack_error("Input available = %ld", available_frames);
173  jack_error("JackLibSampleRateResampler::WriteResample error read_frames = %ld", read_frames);
174  }
175 
176  return read_frames;
177 }
178 
179 }
void jack_ringbuffer_write_advance(jack_ringbuffer_t *rb, size_t cnt)
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
void jack_ringbuffer_get_read_vector(const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
void jack_ringbuffer_get_write_vector(const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
void jack_ringbuffer_read_advance(jack_ringbuffer_t *rb, size_t cnt)
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108