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 
JackLibSampleRateResampler()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 
JackLibSampleRateResampler(unsigned int quality)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 
~JackLibSampleRateResampler()68 JackLibSampleRateResampler::~JackLibSampleRateResampler()
69 {
70     src_delete(fResampler);
71 }
72 
Reset(unsigned int new_size)73 void JackLibSampleRateResampler::Reset(unsigned int new_size)
74 {
75     JackResampler::Reset(new_size);
76     src_reset(fResampler);
77 }
78 
ReadResample(jack_default_audio_sample_t * buffer,unsigned int frames)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 
WriteResample(jack_default_audio_sample_t * buffer,unsigned int frames)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 }
180