src/lib/analyse_audio_job.cc

   1 /*
   2     Copyright (C) 2012-2015 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 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  54         : Job (film)
  55         , _playlist (playlist)
  56         , _done (0)
  57         , _samples_per_point (1)
  58         , _current (0)
  59         , _sample_peak (new float[film->audio_channels()])
  60         , _sample_peak_frame (new Frame[film->audio_channels()])
  61 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  62         , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), film->audio_channels()))
  63 #endif
  64 {
  65 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  66         _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
  67         _ebur128->setup (_filters);
  68 #endif
  69
  70         for (int i = 0; i < film->audio_channels(); ++i) {
  71                 _sample_peak[i] = 0;
  72                 _sample_peak_frame[i] = 0;
  73         }
  74 }
  75
  76 AnalyseAudioJob::~AnalyseAudioJob ()
  77 {
  78         BOOST_FOREACH (Filter const * i, _filters) {
  79                 delete const_cast<Filter*> (i);
  80         }
  81         delete[] _current;
  82         delete[] _sample_peak;
  83         delete[] _sample_peak_frame;
  84 }
  85
  86 string
  87 AnalyseAudioJob::name () const
  88 {
  89         return _("Analyse audio");
  90 }
  91
  92 string
  93 AnalyseAudioJob::json_name () const
  94 {
  95         return N_("analyse_audio");
  96 }
  97
  98 void
  99 AnalyseAudioJob::run ()
 100 {
 101         shared_ptr<Player> player (new Player (_film, _playlist));
 102         player->set_ignore_video ();
 103         player->set_fast ();
 104         player->set_play_referenced ();
 105
 106         DCPTime const start = _playlist->start().get_value_or (DCPTime ());
 107         DCPTime const length = _playlist->length ();
 108
 109         Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
 110         _samples_per_point = max (int64_t (1), len / _num_points);
 111
 112         delete[] _current;
 113         _current = new AudioPoint[_film->audio_channels ()];
 114         _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
 115
 116         bool has_any_audio = false;
 117         BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
 118                 if (c->audio) {
 119                         has_any_audio = true;
 120                 }
 121         }
 122
 123         if (has_any_audio) {
 124                 _done = 0;
 125                 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
 126                 for (DCPTime t = start; t < length; t += block) {
 127                         shared_ptr<const AudioBuffers> audio = player->get_audio (t, block, false);
 128 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 129                         if (Config::instance()->analyse_ebur128 ()) {
 130                                 _ebur128->process (audio);
 131                         }
 132 #endif
 133                         analyse (audio);
 134                         set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
 135                 }
 136         }
 137
 138         vector<AudioAnalysis::PeakTime> sample_peak;
 139         for (int i = 0; i < _film->audio_channels(); ++i) {
 140                 sample_peak.push_back (
 141                         AudioAnalysis::PeakTime (_sample_peak[i], DCPTime::from_frames (_sample_peak_frame[i], _film->audio_frame_rate ()))
 142                         );
 143         }
 144         _analysis->set_sample_peak (sample_peak);
 145
 146 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 147         if (Config::instance()->analyse_ebur128 ()) {
 148                 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
 149                 vector<float> true_peak;
 150                 for (int i = 0; i < _film->audio_channels(); ++i) {
 151                         true_peak.push_back (av_ebur128_get_true_peaks(eb)[i]);
 152                 }
 153                 _analysis->set_true_peak (true_peak);
 154                 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
 155                 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
 156         }
 157 #endif
 158
 159         if (_playlist->content().size() == 1) {
 160                 /* If there was only one piece of content in this analysis we may later need to know what its
 161                    gain was when we analysed it.
 162                 */
 163                 shared_ptr<const AudioContent> ac = _playlist->content().front()->audio;
 164                 DCPOMATIC_ASSERT (ac);
 165                 _analysis->set_analysis_gain (ac->gain ());
 166         }
 167
 168         _analysis->write (_film->audio_analysis_path (_playlist));
 169
 170         set_progress (1);
 171         set_state (FINISHED_OK);
 172 }
 173
 174 void
 175 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
 176 {
 177         int const frames = b->frames ();
 178         int const channels = b->channels ();
 179
 180         for (int j = 0; j < channels; ++j) {
 181                 float* data = b->data(j);
 182                 for (int i = 0; i < frames; ++i) {
 183                         float s = data[i];
 184                         float as = fabsf (s);
 185                         if (as < 10e-7) {
 186                                 /* We may struggle to serialise and recover inf or -inf, so prevent such
 187                                    values by replacing with this (140dB down) */
 188                                 s = as = 10e-7;
 189                         }
 190                         _current[j][AudioPoint::RMS] += pow (s, 2);
 191                         _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
 192
 193                         if (as > _sample_peak[j]) {
 194                                 _sample_peak[j] = as;
 195                                 _sample_peak_frame[j] = _done + i;
 196                         }
 197
 198                         if (((_done + i) % _samples_per_point) == 0) {
 199                                 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
 200                                 _analysis->add_point (j, _current[j]);
 201                                 _current[j] = AudioPoint ();
 202                         }
 203                 }
 204         }
 205
 206         _done += frames;
 207 }