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<Film> f)
39 , _samples_per_point (1)
45 AnalyseAudioJob::name () const
47 return String::compose (_("Analyse audio of %1"), _film->name());
51 AnalyseAudioJob::run ()
53 shared_ptr<Player> player = _film->player ();
54 player->disable_video ();
56 player->Audio.connect (bind (&AnalyseAudioJob::audio, this, _1));
58 _samples_per_point = max (int64_t (1), _film->time_to_audio_frames (_film->length()) / _num_points);
60 _current.resize (MAX_AUDIO_CHANNELS);
61 _analysis.reset (new AudioAnalysis (MAX_AUDIO_CHANNELS));
63 while (!player->pass()) {
64 set_progress (float (_done) / _film->time_to_audio_frames (_film->length ()));
67 _analysis->write (_film->audio_analysis_path ());
70 set_state (FINISHED_OK);
74 AnalyseAudioJob::audio (shared_ptr<const AudioBuffers> b)
76 for (int i = 0; i < b->frames(); ++i) {
77 for (int j = 0; j < b->channels(); ++j) {
78 float s = b->data(j)[i];
79 if (fabsf (s) < 10e-7) {
80 /* stringstream can't serialise and recover inf or -inf, so prevent such
81 values by replacing with this (140dB down) */
84 _current[j][AudioPoint::RMS] += pow (s, 2);
85 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], fabsf (s));
87 if ((_done % _samples_per_point) == 0) {
88 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
89 _analysis->add_point (j, _current[j]);
91 _current[j] = AudioPoint ();