src/lib/analyse_audio_job.cc

   1 /*
   2     Copyright (C) 2012-2018 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "audio_analysis.h"
  22 #include "audio_buffers.h"
  23 #include "analyse_audio_job.h"
  24 #include "audio_content.h"
  25 #include "compose.hpp"
  26 #include "film.h"
  27 #include "player.h"
  28 #include "playlist.h"
  29 #include "filter.h"
  30 #include "audio_filter_graph.h"
  31 #include "config.h"
  32 extern "C" {
  33 #include <libavutil/channel_layout.h>
  34 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  35 #include <libavfilter/f_ebur128.h>
  36 #endif
  37 }
  38 #include <boost/foreach.hpp>
  39 #include <iostream>
  40
  41 #include "i18n.h"
  42
  43 using std::string;
  44 using std::vector;
  45 using std::max;
  46 using std::min;
  47 using std::cout;
  48 using boost::shared_ptr;
  49 using boost::dynamic_pointer_cast;
  50
  51 int const AnalyseAudioJob::_num_points = 1024;
  52
  53 /** @param from_zero true to analyse audio from time 0 in the playlist, otherwise begin at Playlist::start */
  54 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist, bool from_zero)
  55         : Job (film)
  56         , _playlist (playlist)
  57         , _path (film->audio_analysis_path(playlist))
  58         , _from_zero (from_zero)
  59         , _done (0)
  60         , _samples_per_point (1)
  61         , _current (0)
  62         , _sample_peak (new float[film->audio_channels()])
  63         , _sample_peak_frame (new Frame[film->audio_channels()])
  64 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  65         , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), film->audio_channels()))
  66 #endif
  67 {
  68 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  69         _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
  70         _ebur128->setup (_filters);
  71 #endif
  72
  73         for (int i = 0; i < film->audio_channels(); ++i) {
  74                 _sample_peak[i] = 0;
  75                 _sample_peak_frame[i] = 0;
  76         }
  77
  78         if (!_from_zero) {
  79                 _start = _playlist->start().get_value_or(DCPTime());
  80         }
  81 }
  82
  83 AnalyseAudioJob::~AnalyseAudioJob ()
  84 {
  85         BOOST_FOREACH (Filter const * i, _filters) {
  86                 delete const_cast<Filter*> (i);
  87         }
  88         delete[] _current;
  89         delete[] _sample_peak;
  90         delete[] _sample_peak_frame;
  91 }
  92
  93 string
  94 AnalyseAudioJob::name () const
  95 {
  96         return _("Analysing audio");
  97 }
  98
  99 string
 100 AnalyseAudioJob::json_name () const
 101 {
 102         return N_("analyse_audio");
 103 }
 104
 105 void
 106 AnalyseAudioJob::run ()
 107 {
 108         shared_ptr<Player> player (new Player (_film, _playlist));
 109         player->set_ignore_video ();
 110         player->set_ignore_text ();
 111         player->set_fast ();
 112         player->set_play_referenced ();
 113         player->Audio.connect (bind (&AnalyseAudioJob::analyse, this, _1, _2));
 114
 115         DCPTime const length = _playlist->length (_film);
 116
 117         Frame const len = DCPTime (length - _start).frames_round (_film->audio_frame_rate());
 118         _samples_per_point = max (int64_t (1), len / _num_points);
 119
 120         delete[] _current;
 121         _current = new AudioPoint[_film->audio_channels ()];
 122         _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
 123
 124         bool has_any_audio = false;
 125         BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
 126                 if (c->audio) {
 127                         has_any_audio = true;
 128                 }
 129         }
 130
 131         if (has_any_audio) {
 132                 player->seek (_start, true);
 133                 _done = 0;
 134                 while (!player->pass ()) {}
 135         }
 136
 137         vector<AudioAnalysis::PeakTime> sample_peak;
 138         for (int i = 0; i < _film->audio_channels(); ++i) {
 139                 sample_peak.push_back (
 140                         AudioAnalysis::PeakTime (_sample_peak[i], DCPTime::from_frames (_sample_peak_frame[i], _film->audio_frame_rate ()))
 141                         );
 142         }
 143         _analysis->set_sample_peak (sample_peak);
 144
 145 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 146         if (Config::instance()->analyse_ebur128 ()) {
 147                 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
 148                 vector<float> true_peak;
 149                 for (int i = 0; i < _film->audio_channels(); ++i) {
 150                         true_peak.push_back (av_ebur128_get_true_peaks(eb)[i]);
 151                 }
 152                 _analysis->set_true_peak (true_peak);
 153                 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
 154                 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
 155         }
 156 #endif
 157
 158         if (_playlist->content().size() == 1) {
 159                 /* If there was only one piece of content in this analysis we may later need to know what its
 160                    gain was when we analysed it.
 161                 */
 162                 shared_ptr<const AudioContent> ac = _playlist->content().front()->audio;
 163                 if (ac) {
 164                         _analysis->set_analysis_gain (ac->gain());
 165                 }
 166         }
 167
 168         _analysis->set_samples_per_point (_samples_per_point);
 169         _analysis->set_sample_rate (_film->audio_frame_rate ());
 170         _analysis->write (_path);
 171
 172         set_progress (1);
 173         set_state (FINISHED_OK);
 174 }
 175
 176 void
 177 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b, DCPTime time)
 178 {
 179         DCPOMATIC_ASSERT (time >= _start);
 180
 181 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 182         if (Config::instance()->analyse_ebur128 ()) {
 183                 _ebur128->process (b);
 184         }
 185 #endif
 186
 187         int const frames = b->frames ();
 188         int const channels = b->channels ();
 189
 190         for (int j = 0; j < channels; ++j) {
 191                 float* data = b->data(j);
 192                 for (int i = 0; i < frames; ++i) {
 193                         float s = data[i];
 194                         float as = fabsf (s);
 195                         if (as < 10e-7) {
 196                                 /* We may struggle to serialise and recover inf or -inf, so prevent such
 197                                    values by replacing with this (140dB down) */
 198                                 s = as = 10e-7;
 199                         }
 200                         _current[j][AudioPoint::RMS] += pow (s, 2);
 201                         _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
 202
 203                         if (as > _sample_peak[j]) {
 204                                 _sample_peak[j] = as;
 205                                 _sample_peak_frame[j] = _done + i;
 206                         }
 207
 208                         if (((_done + i) % _samples_per_point) == 0) {
 209                                 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
 210                                 _analysis->add_point (j, _current[j]);
 211                                 _current[j] = AudioPoint ();
 212                         }
 213                 }
 214         }
 215
 216         _done += frames;
 217
 218         DCPTime const length = _playlist->length (_film);
 219         set_progress ((time.seconds() - _start.seconds()) / (length.seconds() - _start.seconds()));
 220 }