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::max;
  45 using std::min;
  46 using std::cout;
  47 using boost::shared_ptr;
  48 using boost::dynamic_pointer_cast;
  49
  50 int const AnalyseAudioJob::_num_points = 1024;
  51
  52 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  53         : Job (film)
  54         , _playlist (playlist)
  55         , _done (0)
  56         , _samples_per_point (1)
  57         , _current (0)
  58         , _sample_peak (0)
  59         , _sample_peak_frame (0)
  60 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  61         , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), film->audio_channels()))
  62 #endif
  63 {
  64 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  65         _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
  66         _ebur128->setup (_filters);
  67 #endif
  68 }
  69
  70 AnalyseAudioJob::~AnalyseAudioJob ()
  71 {
  72         BOOST_FOREACH (Filter const * i, _filters) {
  73                 delete const_cast<Filter*> (i);
  74         }
  75         delete[] _current;
  76 }
  77
  78 string
  79 AnalyseAudioJob::name () const
  80 {
  81         return _("Analyse audio");
  82 }
  83
  84 string
  85 AnalyseAudioJob::json_name () const
  86 {
  87         return N_("analyse_audio");
  88 }
  89
  90 void
  91 AnalyseAudioJob::run ()
  92 {
  93         shared_ptr<Player> player (new Player (_film, _playlist));
  94         player->set_ignore_video ();
  95         player->set_fast ();
  96         player->set_play_referenced ();
  97
  98         DCPTime const start = _playlist->start().get_value_or (DCPTime ());
  99         DCPTime const length = _playlist->length ();
 100
 101         Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
 102         _samples_per_point = max (int64_t (1), len / _num_points);
 103
 104         delete[] _current;
 105         _current = new AudioPoint[_film->audio_channels ()];
 106         _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
 107
 108         bool has_any_audio = false;
 109         BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
 110                 if (c->audio) {
 111                         has_any_audio = true;
 112                 }
 113         }
 114
 115         if (has_any_audio) {
 116                 _done = 0;
 117                 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
 118                 for (DCPTime t = start; t < length; t += block) {
 119                         shared_ptr<const AudioBuffers> audio = player->get_audio (t, block, false);
 120 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 121                         if (Config::instance()->analyse_ebur128 ()) {
 122                                 _ebur128->process (audio);
 123                         }
 124 #endif
 125                         analyse (audio);
 126                         set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
 127                 }
 128         }
 129
 130         _analysis->set_sample_peak (_sample_peak, DCPTime::from_frames (_sample_peak_frame, _film->audio_frame_rate ()));
 131
 132 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 133         if (Config::instance()->analyse_ebur128 ()) {
 134                 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
 135                 double true_peak = 0;
 136                 for (int i = 0; i < _film->audio_channels(); ++i) {
 137                         true_peak = max (true_peak, av_ebur128_get_true_peaks(eb)[i]);
 138                 }
 139                 _analysis->set_true_peak (true_peak);
 140                 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
 141                 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
 142         }
 143 #endif
 144
 145         if (_playlist->content().size() == 1) {
 146                 /* If there was only one piece of content in this analysis we may later need to know what its
 147                    gain was when we analysed it.
 148                 */
 149                 shared_ptr<const AudioContent> ac = _playlist->content().front()->audio;
 150                 DCPOMATIC_ASSERT (ac);
 151                 _analysis->set_analysis_gain (ac->gain ());
 152         }
 153
 154         _analysis->write (_film->audio_analysis_path (_playlist));
 155
 156         set_progress (1);
 157         set_state (FINISHED_OK);
 158 }
 159
 160 void
 161 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
 162 {
 163         int const frames = b->frames ();
 164         int const channels = b->channels ();
 165
 166         for (int j = 0; j < channels; ++j) {
 167                 float* data = b->data(j);
 168                 for (int i = 0; i < frames; ++i) {
 169                         float s = data[i];
 170                         float as = fabsf (s);
 171                         if (as < 10e-7) {
 172                                 /* SafeStringStream can't serialise and recover inf or -inf, so prevent such
 173                                    values by replacing with this (140dB down) */
 174                                 s = as = 10e-7;
 175                         }
 176                         _current[j][AudioPoint::RMS] += pow (s, 2);
 177                         _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
 178
 179                         if (as > _sample_peak) {
 180                                 _sample_peak = as;
 181                                 _sample_peak_frame = _done + i;
 182                         }
 183
 184                         if (((_done + i) % _samples_per_point) == 0) {
 185                                 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
 186                                 _analysis->add_point (j, _current[j]);
 187                                 _current[j] = AudioPoint ();
 188                         }
 189                 }
 190         }
 191
 192         _done += frames;
 193 }