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 <boost/make_shared.hpp>
  40 #include <iostream>
  41
  42 #include "i18n.h"
  43
  44 using std::string;
  45 using std::max;
  46 using std::min;
  47 using std::cout;
  48 using boost::shared_ptr;
  49 using boost::dynamic_pointer_cast;
  50 using boost::make_shared;
  51
  52 int const AnalyseAudioJob::_num_points = 1024;
  53
  54 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  55         : Job (film)
  56         , _playlist (playlist)
  57         , _done (0)
  58         , _samples_per_point (1)
  59         , _current (0)
  60         , _sample_peak (0)
  61         , _sample_peak_frame (0)
  62 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  63         , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), film->audio_channels()))
  64 #endif
  65 {
  66 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  67         _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
  68         _ebur128->setup (_filters);
  69 #endif
  70 }
  71
  72 AnalyseAudioJob::~AnalyseAudioJob ()
  73 {
  74         BOOST_FOREACH (Filter const * i, _filters) {
  75                 delete const_cast<Filter*> (i);
  76         }
  77         delete[] _current;
  78 }
  79
  80 string
  81 AnalyseAudioJob::name () const
  82 {
  83         return _("Analyse audio");
  84 }
  85
  86 string
  87 AnalyseAudioJob::json_name () const
  88 {
  89         return N_("analyse_audio");
  90 }
  91
  92 void
  93 AnalyseAudioJob::run ()
  94 {
  95         shared_ptr<Player> player = make_shared<Player> (_film, _playlist);
  96         player->set_ignore_video ();
  97         player->set_fast ();
  98         player->set_play_referenced ();
  99
 100         DCPTime const start = _playlist->start().get_value_or (DCPTime ());
 101         DCPTime const length = _playlist->length ();
 102
 103         Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
 104         _samples_per_point = max (int64_t (1), len / _num_points);
 105
 106         delete[] _current;
 107         _current = new AudioPoint[_film->audio_channels ()];
 108         _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
 109
 110         bool has_any_audio = false;
 111         BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
 112                 if (c->audio) {
 113                         has_any_audio = true;
 114                 }
 115         }
 116
 117         if (has_any_audio) {
 118                 _done = 0;
 119                 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
 120                 for (DCPTime t = start; t < length; t += block) {
 121                         shared_ptr<const AudioBuffers> audio = player->get_audio (t, block, false);
 122 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 123                         if (Config::instance()->analyse_ebur128 ()) {
 124                                 _ebur128->process (audio);
 125                         }
 126 #endif
 127                         analyse (audio);
 128                         set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
 129                 }
 130         }
 131
 132         _analysis->set_sample_peak (_sample_peak, DCPTime::from_frames (_sample_peak_frame, _film->audio_frame_rate ()));
 133
 134 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 135         if (Config::instance()->analyse_ebur128 ()) {
 136                 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
 137                 double true_peak = 0;
 138                 for (int i = 0; i < _film->audio_channels(); ++i) {
 139                         true_peak = max (true_peak, av_ebur128_get_true_peaks(eb)[i]);
 140                 }
 141                 _analysis->set_true_peak (true_peak);
 142                 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
 143                 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
 144         }
 145 #endif
 146
 147         if (_playlist->content().size() == 1) {
 148                 /* If there was only one piece of content in this analysis we may later need to know what its
 149                    gain was when we analysed it.
 150                 */
 151                 shared_ptr<const AudioContent> ac = _playlist->content().front()->audio;
 152                 DCPOMATIC_ASSERT (ac);
 153                 _analysis->set_analysis_gain (ac->gain ());
 154         }
 155
 156         _analysis->write (_film->audio_analysis_path (_playlist));
 157
 158         set_progress (1);
 159         set_state (FINISHED_OK);
 160 }
 161
 162 void
 163 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
 164 {
 165         int const frames = b->frames ();
 166         int const channels = b->channels ();
 167
 168         for (int j = 0; j < channels; ++j) {
 169                 float* data = b->data(j);
 170                 for (int i = 0; i < frames; ++i) {
 171                         float s = data[i];
 172                         float as = fabsf (s);
 173                         if (as < 10e-7) {
 174                                 /* SafeStringStream can't serialise and recover inf or -inf, so prevent such
 175                                    values by replacing with this (140dB down) */
 176                                 s = as = 10e-7;
 177                         }
 178                         _current[j][AudioPoint::RMS] += pow (s, 2);
 179                         _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
 180
 181                         if (as > _sample_peak) {
 182                                 _sample_peak = as;
 183                                 _sample_peak_frame = _done + i;
 184                         }
 185
 186                         if (((_done + i) % _samples_per_point) == 0) {
 187                                 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
 188                                 _analysis->add_point (j, _current[j]);
 189                                 _current[j] = AudioPoint ();
 190                         }
 191                 }
 192         }
 193
 194         _done += frames;
 195 }