src/lib/analyse_subtitles_job.cc

   1 /*
   2     Copyright (C) 2020-2021 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
  22 #include "analyse_subtitles_job.h"
  23 #include "bitmap_text.h"
  24 #include "film.h"
  25 #include "image.h"
  26 #include "player.h"
  27 #include "playlist.h"
  28 #include "render_text.h"
  29 #include "subtitle_analysis.h"
  30 #include "text_content.h"
  31 #include <iostream>
  32
  33 #include "i18n.h"
  34
  35
  36 using std::make_shared;
  37 using std::shared_ptr;
  38 using std::string;
  39 using std::weak_ptr;
  40 #if BOOST_VERSION >= 106100
  41 using namespace boost::placeholders;
  42 #endif
  43
  44
  45 AnalyseSubtitlesJob::AnalyseSubtitlesJob (shared_ptr<const Film> film, shared_ptr<Content> content)
  46         : Job (film)
  47         , _content (content)
  48         , _path (_film->subtitle_analysis_path(content))
  49 {
  50 }
  51
  52
  53 string
  54 AnalyseSubtitlesJob::name () const
  55 {
  56         return _("Analysing subtitles");
  57 }
  58
  59
  60 string
  61 AnalyseSubtitlesJob::json_name () const
  62 {
  63         return N_("analyse_subtitles");
  64 }
  65
  66
  67 void
  68 AnalyseSubtitlesJob::run ()
  69 {
  70         auto playlist = make_shared<Playlist>();
  71         auto content = _content.lock ();
  72         DCPOMATIC_ASSERT (content);
  73         playlist->add (_film, content);
  74
  75         auto player = make_shared<Player>(_film, playlist);
  76         player->set_ignore_audio ();
  77         player->set_fast ();
  78         player->set_play_referenced ();
  79         player->Text.connect (bind(&AnalyseSubtitlesJob::analyse, this, _1, _2));
  80
  81         set_progress_unknown ();
  82
  83         if (!content->text.empty()) {
  84                 while (!player->pass ()) {
  85                         boost::this_thread::interruption_point();
  86                 }
  87         }
  88
  89         SubtitleAnalysis analysis (_bounding_box, content->text.front()->x_offset(), content->text.front()->y_offset());
  90         analysis.write (_path);
  91
  92         set_progress (1);
  93         set_state (FINISHED_OK);
  94 }
  95
  96
  97 void
  98 AnalyseSubtitlesJob::analyse(PlayerText const& text, TextType type)
  99 {
 100         if (type != TextType::OPEN_SUBTITLE) {
 101                 return;
 102         }
 103
 104         for (auto const& i: text.bitmap) {
 105                 if (!_bounding_box) {
 106                         _bounding_box = i.rectangle;
 107                 } else {
 108                         _bounding_box->extend (i.rectangle);
 109                 }
 110         }
 111
 112         if (text.string.empty()) {
 113                 return;
 114         }
 115
 116         /* We can provide dummy values for time and frame rate here as they are only used to calculate fades */
 117         dcp::Size const frame = _film->frame_size();
 118         std::vector<dcp::SubtitleStandard> override_standard;
 119         if (_film->interop()) {
 120                 /* Since the film is Interop there is only one way the vpositions in the subs can be interpreted
 121                  * (we assume).
 122                  */
 123                 override_standard.push_back(dcp::SubtitleStandard::INTEROP);
 124         } else {
 125                 /* We're using the great new SMPTE standard, which means there are two different ways that vposition
 126                  * could be interpreted; we will write SMPTE-2014 standard assets, but if the projection system uses
 127                  * SMPTE 20{07,10} instead they won't be placed how we intended.  To show the user this, make the
 128                  * bounding rectangle enclose both possibilities.
 129                  */
 130                 override_standard.push_back(dcp::SubtitleStandard::SMPTE_2007);
 131                 override_standard.push_back(dcp::SubtitleStandard::SMPTE_2014);
 132         }
 133
 134         for (auto standard: override_standard) {
 135                 for (auto i: bounding_box(text.string, frame, standard)) {
 136                         dcpomatic::Rect<double> rect (
 137                                 double(i.x) / frame.width, double(i.y) / frame.height,
 138                                 double(i.width) / frame.width, double(i.height) / frame.height
 139                                 );
 140                         if (!_bounding_box) {
 141                                 _bounding_box = rect;
 142                         } else {
 143                                 _bounding_box->extend (rect);
 144                         }
 145                 }
 146         }
 147 }
 148