2 Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
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.
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.
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.
20 #include "resampler.h"
21 #include "audio_buffers.h"
22 #include "exceptions.h"
23 #include "compose.hpp"
24 #include "dcpomatic_assert.h"
25 #include <samplerate.h>
33 using boost::shared_ptr;
35 /** @param in Input sampling rate (Hz)
36 * @param out Output sampling rate (Hz)
37 * @param channels Number of channels.
38 * @param fast true to be fast rather than good.
40 Resampler::Resampler (int in, int out, int channels, bool fast)
43 , _channels (channels)
46 _src = src_new (fast ? SRC_LINEAR : SRC_SINC_BEST_QUALITY, _channels, &error);
48 throw StringError (String::compose (N_("could not create sample-rate converter (%1)"), error));
52 Resampler::~Resampler ()
57 shared_ptr<const AudioBuffers>
58 Resampler::run (shared_ptr<const AudioBuffers> in)
60 int in_frames = in->frames ();
63 shared_ptr<AudioBuffers> resampled (new AudioBuffers (_channels, 0));
65 while (in_frames > 0) {
67 /* Compute the resampled frames count and add 32 for luck */
68 int const max_resampled_frames = ceil ((double) in_frames * _out_rate / _in_rate) + 32;
71 data.data_in = new float[in_frames * _channels];
74 float** p = in->data ();
75 float* q = data.data_in;
76 for (int i = 0; i < in_frames; ++i) {
77 for (int j = 0; j < _channels; ++j) {
78 *q++ = p[j][in_offset + i];
83 data.input_frames = in_frames;
85 data.data_out = new float[max_resampled_frames * _channels];
86 data.output_frames = max_resampled_frames;
88 data.end_of_input = 0;
89 data.src_ratio = double (_out_rate) / _in_rate;
91 int const r = src_process (_src, &data);
93 delete[] data.data_in;
94 delete[] data.data_out;
95 throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
98 if (data.output_frames_gen == 0) {
102 resampled->ensure_size (out_offset + data.output_frames_gen);
103 resampled->set_frames (out_offset + data.output_frames_gen);
106 float* p = data.data_out;
107 float** q = resampled->data ();
108 for (int i = 0; i < data.output_frames_gen; ++i) {
109 for (int j = 0; j < _channels; ++j) {
110 q[j][out_offset + i] = *p++;
115 in_frames -= data.input_frames_used;
116 in_offset += data.input_frames_used;
117 out_offset += data.output_frames_gen;
119 delete[] data.data_in;
120 delete[] data.data_out;
126 shared_ptr<const AudioBuffers>
129 shared_ptr<AudioBuffers> out (new AudioBuffers (_channels, 0));
131 int64_t const output_size = 65536;
134 float buffer[output_size];
137 data.data_in = dummy;
138 data.input_frames = 0;
139 data.data_out = buffer;
140 data.output_frames = output_size;
141 data.end_of_input = 1;
142 data.src_ratio = double (_out_rate) / _in_rate;
144 int const r = src_process (_src, &data);
146 throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
149 out->ensure_size (out_offset + data.output_frames_gen);
151 float* p = data.data_out;
152 float** q = out->data ();
153 for (int i = 0; i < data.output_frames_gen; ++i) {
154 for (int j = 0; j < _channels; ++j) {
155 q[j][out_offset + i] = *p++;
159 out_offset += data.output_frames_gen;
160 out->set_frames (out_offset);