Jack2  1.9.8
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 
22 namespace Jack
23 {
24 
25 JackLibSampleRateResampler::JackLibSampleRateResampler()
26  :JackResampler()
27 {
28  int error;
29  fResampler = src_new(SRC_LINEAR, 1, &error);
30  if (error != 0)
31  jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
32 }
33 
34 JackLibSampleRateResampler::JackLibSampleRateResampler(unsigned int quality)
35  :JackResampler()
36 {
37  switch (quality) {
38  case 0:
39  quality = SRC_LINEAR;
40  break;
41  case 1:
42  quality = SRC_ZERO_ORDER_HOLD;
43  break;
44  case 2:
45  quality = SRC_SINC_FASTEST;
46  break;
47  case 3:
48  quality = SRC_SINC_MEDIUM_QUALITY;
49  break;
50  case 4:
51  quality = SRC_SINC_BEST_QUALITY;
52  break;
53  default:
54  quality = SRC_LINEAR;
55  jack_error("Out of range resample quality");
56  break;
57  }
58 
59  int error;
60  fResampler = src_new(quality, 1, &error);
61  if (error != 0) {
62  jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
63  }
64 }
65 
66 JackLibSampleRateResampler::~JackLibSampleRateResampler()
67 {
68  src_delete(fResampler);
69 }
70 
71 void JackLibSampleRateResampler::Reset(unsigned int new_size)
72 {
73  JackResampler::Reset(new_size);
74  src_reset(fResampler);
75 }
76 
77 unsigned int JackLibSampleRateResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
78 {
79  jack_ringbuffer_data_t ring_buffer_data[2];
80  SRC_DATA src_data;
81  unsigned int frames_to_write = frames;
82  unsigned int written_frames = 0;
83  int res;
84 
85  jack_ringbuffer_get_read_vector(fRingBuffer, ring_buffer_data);
86  unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
87  jack_log("Output available = %ld", available_frames);
88 
89  for (int j = 0; j < 2; j++) {
90 
91  if (ring_buffer_data[j].len > 0) {
92 
93  src_data.data_in = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
94  src_data.data_out = &buffer[written_frames];
95  src_data.input_frames = ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t);
96  src_data.output_frames = frames_to_write;
97  src_data.end_of_input = 0;
98  src_data.src_ratio = fRatio;
99 
100  res = src_process(fResampler, &src_data);
101  if (res != 0) {
102  jack_error("JackLibSampleRateResampler::ReadResample ratio = %f err = %s", fRatio, src_strerror(res));
103  return 0;
104  }
105 
106  frames_to_write -= src_data.output_frames_gen;
107  written_frames += src_data.output_frames_gen;
108 
109  if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
110  jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
111  , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
112  }
113 
114  jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
115  jack_ringbuffer_read_advance(fRingBuffer, src_data.input_frames_used * sizeof(jack_default_audio_sample_t));
116  }
117  }
118 
119  if (written_frames < frames) {
120  jack_error("Output available = %ld", available_frames);
121  jack_error("JackLibSampleRateResampler::ReadResample error written_frames = %ld", written_frames);
122  }
123 
124  return written_frames;
125 }
126 
127 unsigned int JackLibSampleRateResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
128 {
129  jack_ringbuffer_data_t ring_buffer_data[2];
130  SRC_DATA src_data;
131  unsigned int frames_to_read = frames;
132  unsigned int read_frames = 0;
133  int res;
134 
135  jack_ringbuffer_get_write_vector(fRingBuffer, ring_buffer_data);
136  unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
137  jack_log("Input available = %ld", available_frames);
138 
139  for (int j = 0; j < 2; j++) {
140 
141  if (ring_buffer_data[j].len > 0) {
142 
143  src_data.data_in = &buffer[read_frames];
144  src_data.data_out = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
145  src_data.input_frames = frames_to_read;
146  src_data.output_frames = (ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t));
147  src_data.end_of_input = 0;
148  src_data.src_ratio = fRatio;
149 
150  res = src_process(fResampler, &src_data);
151  if (res != 0) {
152  jack_error("JackLibSampleRateResampler::WriteResample ratio = %f err = %s", fRatio, src_strerror(res));
153  return 0;
154  }
155 
156  frames_to_read -= src_data.input_frames_used;
157  read_frames += src_data.input_frames_used;
158 
159  if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
160  jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
161  , j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
162  }
163 
164  jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
165  jack_ringbuffer_write_advance(fRingBuffer, src_data.output_frames_gen * sizeof(jack_default_audio_sample_t));
166  }
167  }
168 
169  if (read_frames < frames) {
170  jack_error("Input available = %ld", available_frames);
171  jack_error("JackLibSampleRateResampler::WriteResample error read_frames = %ld", read_frames);
172  }
173 
174  return read_frames;
175 }
176 
177 }