src/lib/text_subtitle_decoder.cc

   1 /*
   2     Copyright (C) 2014-2016 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 "text_subtitle_decoder.h"
  21 #include "text_subtitle_content.h"
  22 #include <dcp/subtitle_string.h>
  23 #include <boost/foreach.hpp>
  24 #include <iostream>
  25
  26 using std::list;
  27 using std::vector;
  28 using std::string;
  29 using std::cout;
  30 using std::max;
  31 using boost::shared_ptr;
  32 using boost::optional;
  33 using boost::dynamic_pointer_cast;
  34
  35 TextSubtitleDecoder::TextSubtitleDecoder (shared_ptr<const TextSubtitleContent> content)
  36         : SubtitleDecoder (content->subtitle)
  37         , TextSubtitle (content)
  38         , _next (0)
  39 {
  40
  41 }
  42
  43 void
  44 TextSubtitleDecoder::seek (ContentTime time, bool accurate)
  45 {
  46         SubtitleDecoder::seek (time, accurate);
  47
  48         _next = 0;
  49         while (_next < _subtitles.size() && ContentTime::from_seconds (_subtitles[_next].from.all_as_seconds ()) < time) {
  50                 ++_next;
  51         }
  52 }
  53
  54 bool
  55 TextSubtitleDecoder::pass (PassReason, bool)
  56 {
  57         if (_next >= _subtitles.size ()) {
  58                 return true;
  59         }
  60
  61         /* XXX: we are ignoring positioning specified in the file */
  62
  63         shared_ptr<const TextSubtitleContent> content = dynamic_pointer_cast<const TextSubtitleContent> (_subtitle_content);
  64         DCPOMATIC_ASSERT (content);
  65
  66         list<dcp::SubtitleString> out;
  67
  68         /* Highest line index in this subtitle */
  69         int highest = 0;
  70         BOOST_FOREACH (sub::Line i, _subtitles[_next].lines) {
  71                 DCPOMATIC_ASSERT (i.vertical_position.reference && i.vertical_position.reference.get() == sub::TOP_OF_SUBTITLE);
  72                 DCPOMATIC_ASSERT (i.vertical_position.line);
  73                 highest = max (highest, i.vertical_position.line.get());
  74         }
  75
  76         BOOST_FOREACH (sub::Line i, _subtitles[_next].lines) {
  77                 BOOST_FOREACH (sub::Block j, i.blocks) {
  78                         out.push_back (
  79                                 dcp::SubtitleString (
  80                                         TextSubtitleContent::font_id,
  81                                         j.italic,
  82                                         j.bold,
  83                                         /* force the colour to whatever is configured */
  84                                         content->colour(),
  85                                         j.font_size.points (72 * 11),
  86                                         1.0,
  87                                         dcp::Time (_subtitles[_next].from.all_as_seconds(), 1000),
  88                                         dcp::Time (_subtitles[_next].to.all_as_seconds(), 1000),
  89                                         0,
  90                                         dcp::HALIGN_CENTER,
  91                                         /* This 1.015 is an arbitrary value to lift the bottom sub off the bottom
  92                                            of the screen a bit to a pleasing degree.
  93                                         */
  94                                         1.015 - ((1 + highest - i.vertical_position.line.get()) * 1.5 / 22),
  95                                         dcp::VALIGN_TOP,
  96                                         dcp::DIRECTION_LTR,
  97                                         j.text,
  98                                         content->outline() ? dcp::BORDER : dcp::NONE,
  99                                         content->outline_colour(),
 100                                         dcp::Time (0, 1000),
 101                                         dcp::Time (0, 1000)
 102                                         )
 103                                 );
 104                 }
 105         }
 106
 107         text_subtitle (content_time_period (_subtitles[_next]), out);
 108
 109         ++_next;
 110         return false;
 111 }
 112
 113 list<ContentTimePeriod>
 114 TextSubtitleDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 115 {
 116         return list<ContentTimePeriod> ();
 117 }
 118
 119 list<ContentTimePeriod>
 120 TextSubtitleDecoder::text_subtitles_during (ContentTimePeriod p, bool starting) const
 121 {
 122         /* XXX: inefficient */
 123
 124         list<ContentTimePeriod> d;
 125
 126         for (vector<sub::Subtitle>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
 127                 ContentTimePeriod t = content_time_period (*i);
 128                 if ((starting && p.contains (t.from)) || (!starting && p.overlaps (t))) {
 129                         d.push_back (t);
 130                 }
 131         }
 132
 133         return d;
 134 }
 135
 136 ContentTimePeriod
 137 TextSubtitleDecoder::content_time_period (sub::Subtitle s) const
 138 {
 139         return ContentTimePeriod (
 140                 ContentTime::from_seconds (s.from.all_as_seconds()),
 141                 ContentTime::from_seconds (s.to.all_as_seconds())
 142                 );
 143 }