src/lib/analyse_audio_job.cc

   1 /*
   2     Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  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"
  25 #include "film.h"
  26 #include "player.h"
  27 #include "playlist.h"
  28 #include "filter.h"
  29 #include "audio_filter_graph.h"
  30 #include "config.h"
  31 extern "C" {
  32 #include <libavutil/channel_layout.h>
  33 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  34 #include <libavfilter/f_ebur128.h>
  35 #endif
  36 }
  37 #include <boost/foreach.hpp>
  38 #include <iostream>
  39
  40 #include "i18n.h"
  41
  42 using std::string;
  43 using std::max;
  44 using std::min;
  45 using std::cout;
  46 using boost::shared_ptr;
  47 using boost::dynamic_pointer_cast;
  48
  49 int const AnalyseAudioJob::_num_points = 1024;
  50
  51 AnalyseAudioJob::AnalyseAudioJob (shared_ptr<const Film> film, shared_ptr<const Playlist> playlist)
  52         : Job (film)
  53         , _playlist (playlist)
  54         , _done (0)
  55         , _samples_per_point (1)
  56         , _current (0)
  57         , _sample_peak (0)
  58         , _sample_peak_frame (0)
  59 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  60         , _ebur128 (new AudioFilterGraph (film->audio_frame_rate(), film->audio_channels()))
  61 #endif
  62 {
  63 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
  64         _filters.push_back (new Filter ("ebur128", "ebur128", "audio", "ebur128=peak=true"));
  65         _ebur128->setup (_filters);
  66 #endif
  67 }
  68
  69 AnalyseAudioJob::~AnalyseAudioJob ()
  70 {
  71         BOOST_FOREACH (Filter const * i, _filters) {
  72                 delete const_cast<Filter*> (i);
  73         }
  74         delete[] _current;
  75 }
  76
  77 string
  78 AnalyseAudioJob::name () const
  79 {
  80         return _("Analyse audio");
  81 }
  82
  83 string
  84 AnalyseAudioJob::json_name () const
  85 {
  86         return N_("analyse_audio");
  87 }
  88
  89 void
  90 AnalyseAudioJob::run ()
  91 {
  92         shared_ptr<Player> player (new Player (_film, _playlist));
  93         player->set_ignore_video ();
  94         player->set_fast ();
  95         player->set_play_referenced ();
  96
  97         DCPTime const start = _playlist->start().get_value_or (DCPTime ());
  98         DCPTime const length = _playlist->length ();
  99
 100         Frame const len = DCPTime (length - start).frames_round (_film->audio_frame_rate());
 101         _samples_per_point = max (int64_t (1), len / _num_points);
 102
 103         delete[] _current;
 104         _current = new AudioPoint[_film->audio_channels ()];
 105         _analysis.reset (new AudioAnalysis (_film->audio_channels ()));
 106
 107         bool has_any_audio = false;
 108         BOOST_FOREACH (shared_ptr<Content> c, _playlist->content ()) {
 109                 if (c->audio) {
 110                         has_any_audio = true;
 111                 }
 112         }
 113
 114         if (has_any_audio) {
 115                 _done = 0;
 116                 DCPTime const block = DCPTime::from_seconds (1.0 / 8);
 117                 for (DCPTime t = start; t < length; t += block) {
 118                         shared_ptr<const AudioBuffers> audio = player->get_audio (t, block, false);
 119 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 120                         if (Config::instance()->analyse_ebur128 ()) {
 121                                 _ebur128->process (audio);
 122                         }
 123 #endif
 124                         analyse (audio);
 125                         set_progress ((t.seconds() - start.seconds()) / (length.seconds() - start.seconds()));
 126                 }
 127         }
 128
 129         _analysis->set_sample_peak (_sample_peak, DCPTime::from_frames (_sample_peak_frame, _film->audio_frame_rate ()));
 130
 131 #ifdef DCPOMATIC_HAVE_EBUR128_PATCHED_FFMPEG
 132         if (Config::instance()->analyse_ebur128 ()) {
 133                 void* eb = _ebur128->get("Parsed_ebur128_0")->priv;
 134                 double true_peak = 0;
 135                 for (int i = 0; i < _film->audio_channels(); ++i) {
 136                         true_peak = max (true_peak, av_ebur128_get_true_peaks(eb)[i]);
 137                 }
 138                 _analysis->set_true_peak (true_peak);
 139                 _analysis->set_integrated_loudness (av_ebur128_get_integrated_loudness(eb));
 140                 _analysis->set_loudness_range (av_ebur128_get_loudness_range(eb));
 141         }
 142 #endif
 143
 144         if (_playlist->content().size() == 1) {
 145                 /* If there was only one piece of content in this analysis we may later need to know what its
 146                    gain was when we analysed it.
 147                 */
 148                 shared_ptr<const AudioContent> ac = _playlist->content().front()->audio;
 149                 DCPOMATIC_ASSERT (ac);
 150                 _analysis->set_analysis_gain (ac->gain ());
 151         }
 152
 153         _analysis->write (_film->audio_analysis_path (_playlist));
 154
 155         set_progress (1);
 156         set_state (FINISHED_OK);
 157 }
 158
 159 void
 160 AnalyseAudioJob::analyse (shared_ptr<const AudioBuffers> b)
 161 {
 162         int const frames = b->frames ();
 163         int const channels = b->channels ();
 164
 165         for (int j = 0; j < channels; ++j) {
 166                 float* data = b->data(j);
 167                 for (int i = 0; i < frames; ++i) {
 168                         float s = data[i];
 169                         float as = fabsf (s);
 170                         if (as < 10e-7) {
 171                                 /* SafeStringStream can't serialise and recover inf or -inf, so prevent such
 172                                    values by replacing with this (140dB down) */
 173                                 s = as = 10e-7;
 174                         }
 175                         _current[j][AudioPoint::RMS] += pow (s, 2);
 176                         _current[j][AudioPoint::PEAK] = max (_current[j][AudioPoint::PEAK], as);
 177
 178                         if (as > _sample_peak) {
 179                                 _sample_peak = as;
 180                                 _sample_peak_frame = _done + i;
 181                         }
 182
 183                         if (((_done + i) % _samples_per_point) == 0) {
 184                                 _current[j][AudioPoint::RMS] = sqrt (_current[j][AudioPoint::RMS] / _samples_per_point);
 185                                 _analysis->add_point (j, _current[j]);
 186                                 _current[j] = AudioPoint ();
 187                         }
 188                 }
 189         }
 190
 191         _done += frames;
 192 }