2 Copyright (C) 2012-2015 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 "audio_analysis.h"
21 #include "audio_buffers.h"
22 #include "analyse_audio_job.h"
23 #include "compose.hpp"
26 #include <boost/foreach.hpp>
34 using boost::shared_ptr;
35 using boost::dynamic_pointer_cast;
37 int const AnalyseAudioJob::_num_points = 1024;
39 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film)
42 , _samples_per_point (1)
44 , _overall_peak_frame (0)
50 AnalyseAudioJob::name () const
52 return _("Analyse audio");
56 AnalyseAudioJob::json_name () const
58 return N_("analyse_audio");
62 AnalyseAudioJob::run ()
64 shared_ptr<Player> player (new Player (_film));
65 player->set_ignore_video ();
67 int64_t const len = _film->length().frames (_film->audio_frame_rate());
68 _samples_per_point = max (int64_t (1), len / _num_points);
70 _current.resize (_film->audio_channels ());
71 _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
73 bool has_any_audio = false;
74 BOOST_FOREACH (shared_ptr<Content> c, _film->content ()) {
75 if (dynamic_pointer_cast<AudioContent> (c)) {
82 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
83 for (DCPTime t; t < _film->length(); t += block) {
84 analyse (player->get_audio (t, block, false));
85 set_progress (t.seconds() / _film->length().seconds());
89 _analysis->set_peak (_overall_peak, DCPTime::from_frames (_overall_peak_frame, _film->audio_frame_rate ()));
90 _analysis->write (_film->audio_analysis_path ());
93 set_state (FINISHED_OK);
97 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
99 for (int i = 0; i < b->frames(); ++i) {
100 for (int j = 0; j < b->channels(); ++j) {
101 float s = b->data(j)[i];
102 if (fabsf (s) < 10e-7) {
103 /* SafeStringStream can't serialise and recover inf or -inf, so prevent such
104 values by replacing with this (140dB down) */
107 _current[j][AudioPoint::RMS] += pow (s, 2);
108 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], fabsf (s));
110 float const as = fabs (s);
112 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
114 if (as > _overall_peak) {
116 _overall_peak_frame = _done + i;
119 if ((_done % _samples_per_point) == 0) {
120 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
121 _analysis->add_point (j, _current[j]);
123 _current[j] = AudioPoint ();