2 Copyright (C) 2012 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 "analyse_audio_job.h"
22 #include "compose.hpp"
32 using boost::shared_ptr;
34 int const AnalyseAudioJob::_num_points = 1024;
36 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> f, shared_ptr<AudioContent> c)
40 , _samples_per_point (1)
46 AnalyseAudioJob::name () const
48 return _("Analyse audio");
52 AnalyseAudioJob::run ()
54 shared_ptr<AudioContent> content = _content.lock ();
59 shared_ptr<Playlist> playlist (new Playlist);
60 playlist->add (content);
61 shared_ptr<Player> player (new Player (_film, playlist));
62 player->disable_video ();
64 player->Audio.connect (bind (&AnalyseAudioJob::audio, this, _1, _2));
66 _samples_per_point = max (int64_t (1), _film->time_to_audio_frames (_film->length()) / _num_points);
68 _current.resize (_film->audio_channels ());
69 _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
72 OutputAudioFrame const len = _film->time_to_audio_frames (_film->length ());
73 while (!player->pass ()) {
74 set_progress (double (_done) / len);
77 _analysis->write (content->audio_analysis_path ());
80 set_state (FINISHED_OK);
84 AnalyseAudioJob::audio (shared_ptr<const AudioBuffers> b, Time)
86 for (int i = 0; i < b->frames(); ++i) {
87 for (int j = 0; j < b->channels(); ++j) {
88 float s = b->data(j)[i];
89 if (fabsf (s) < 10e-7) {
90 /* stringstream can't serialise and recover inf or -inf, so prevent such
91 values by replacing with this (140dB down) */
94 _current[j][AudioPoint::RMS] += pow (s, 2);
95 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], fabsf (s));
97 if ((_done % _samples_per_point) == 0) {
98 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
99 _analysis->add_point (j, _current[j]);
101 _current[j] = AudioPoint ();