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 std::runtime_error;
34 using boost::shared_ptr;
36 /** @param in Input sampling rate (Hz)
37 * @param out Output sampling rate (Hz)
38 * @param channels Number of channels.
39 * @param fast true to be fast rather than good.
41 Resampler::Resampler (int in, int out, int channels, bool fast)
44 , _channels (channels)
47 _src = src_new (fast ? SRC_LINEAR : SRC_SINC_BEST_QUALITY, _channels, &error);
49 throw runtime_error (String::compose (N_("could not create sample-rate converter (%1)"), error));
53 Resampler::~Resampler ()
58 shared_ptr<const AudioBuffers>
59 Resampler::run (shared_ptr<const AudioBuffers> in)
61 int in_frames = in->frames ();
64 shared_ptr<AudioBuffers> resampled (new AudioBuffers (_channels, 0));
66 while (in_frames > 0) {
68 /* Compute the resampled frames count and add 32 for luck */
69 int const max_resampled_frames = ceil ((double) in_frames * _out_rate / _in_rate) + 32;
72 data.data_in = new float[in_frames * _channels];
75 float** p = in->data ();
76 float* q = data.data_in;
77 for (int i = 0; i < in_frames; ++i) {
78 for (int j = 0; j < _channels; ++j) {
79 *q++ = p[j][in_offset + i];
84 data.input_frames = in_frames;
86 data.data_out = new float[max_resampled_frames * _channels];
87 data.output_frames = max_resampled_frames;
89 data.end_of_input = 0;
90 data.src_ratio = double (_out_rate) / _in_rate;
92 int const r = src_process (_src, &data);
94 delete[] data.data_in;
95 delete[] data.data_out;
96 throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
99 if (data.output_frames_gen == 0) {
103 resampled->ensure_size (out_offset + data.output_frames_gen);
104 resampled->set_frames (out_offset + data.output_frames_gen);
107 float* p = data.data_out;
108 float** q = resampled->data ();
109 for (int i = 0; i < data.output_frames_gen; ++i) {
110 for (int j = 0; j < _channels; ++j) {
111 q[j][out_offset + i] = *p++;
116 in_frames -= data.input_frames_used;
117 in_offset += data.input_frames_used;
118 out_offset += data.output_frames_gen;
120 delete[] data.data_in;
121 delete[] data.data_out;
127 shared_ptr<const AudioBuffers>
130 shared_ptr<AudioBuffers> out (new AudioBuffers (_channels, 0));
132 int64_t const output_size = 65536;
135 float buffer[output_size];
138 data.data_in = dummy;
139 data.input_frames = 0;
140 data.data_out = buffer;
141 data.output_frames = output_size;
142 data.end_of_input = 1;
143 data.src_ratio = double (_out_rate) / _in_rate;
145 int const r = src_process (_src, &data);
147 throw EncodeError (String::compose (N_("could not run sample-rate converter (%1)"), src_strerror (r)));
150 out->ensure_size (out_offset + data.output_frames_gen);
152 float* p = data.data_out;
153 float** q = out->data ();
154 for (int i = 0; i < data.output_frames_gen; ++i) {
155 for (int j = 0; j < _channels; ++j) {
156 q[j][out_offset + i] = *p++;
160 out_offset += data.output_frames_gen;
161 out->set_frames (out_offset);