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 "audio_content.h"
24 #include "compose.hpp"
29 #include "audio_filter_graph.h"
31 #include <libavutil/channel_layout.h>
33 #include <boost/foreach.hpp>
42 using boost::shared_ptr;
43 using boost::dynamic_pointer_cast;
45 int const AnalyseAudioJob::_num_points = 1024;
48 /* I added these functions to the FFmpeg that DCP-o-matic is built with, but there isn't an
49 existing header file to put the prototype in. Cheat by putting it in here.
51 double* av_ebur128_get_true_peaks (void* context);
52 double* av_ebur128_get_sample_peaks (void* context);
53 double av_ebur128_get_integrated_loudness(void* context);
54 double av_ebur128_get_loudness_range (void* context);
57 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
59 , _playlist (playlist)
61 , _samples_per_point (1)
64 , _sample_peak_frame (0)
65 , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), av_get_default_channel_layout(film->audio_channels())))
67 _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
68 _ebur128->setup (_filters);
71 AnalyseAudioJob::~AnalyseAudioJob ()
73 BOOST_FOREACH (Filter const * i, _filters) {
74 delete const_cast<Filter*> (i);
80 AnalyseAudioJob::name () const
82 return _("Analyse audio");
86 AnalyseAudioJob::json_name () const
88 return N_("analyse_audio");
92 AnalyseAudioJob::run ()
94 shared_ptr<Player> player (new Player (_film, _playlist));
95 player->set_ignore_video ();
97 player->set_play_referenced ();
99 DCPTime const start = _playlist->start().get_value_or (DCPTime ());
100 DCPTime const length = _playlist->length ();
102 Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
103 _samples_per_point = max (int64_t (1), len / _num_points);
106 _current = new AudioPoint[_film->audio_channels ()];
107 _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
109 bool has_any_audio = false;
110 BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
111 if (dynamic_pointer_cast<AudioContent> (c)) {
112 has_any_audio = true;
118 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
119 for (DCPTime t = start; t < length; t += block) {
120 shared_ptr<const AudioBuffers> audio = player->get_audio (t, block, false);
121 _ebur128->process (audio);
123 set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
127 _analysis->set_sample_peak (_sample_peak, DCPTime::from_frames (_sample_peak_frame, _film->audio_frame_rate ()));
129 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
130 double true_peak = 0;
131 for (int i = 0; i < _film->audio_channels(); ++i) {
132 true_peak = max (true_peak, av_ebur128_get_true_peaks(eb)[i]);
134 _analysis->set_true_peak (true_peak);
135 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
136 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
138 if (_playlist->content().size() == 1) {
139 /* If there was only one piece of content in this analysis we may later need to know what its
140 gain was when we analysed it.
142 shared_ptr<const AudioContent> ac = dynamic_pointer_cast<const AudioContent> (_playlist->content().front ());
143 DCPOMATIC_ASSERT (ac);
144 _analysis->set_analysis_gain (ac->audio_gain ());
147 _analysis->write (_film->audio_analysis_path (_playlist));
150 set_state (FINISHED_OK);
154 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
156 int const frames = b->frames ();
157 int const channels = b->channels ();
159 for (int j = 0; j < channels; ++j) {
160 float* data = b->data(j);
161 for (int i = 0; i < frames; ++i) {
163 float as = fabsf (s);
165 /* SafeStringStream can't serialise and recover inf or -inf, so prevent such
166 values by replacing with this (140dB down) */
169 _current[j][AudioPoint::RMS] += pow (s, 2);
170 _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
172 if (as > _sample_peak) {
174 _sample_peak_frame = _done + i;
177 if (((_done + i) % _samples_per_point) == 0) {
178 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
179 _analysis->add_point (j, _current[j]);
180 _current[j] = AudioPoint ();