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 "subtitle_content.h"
  23 #include <dcp/subtitle_string.h>
  24 #include <boost/foreach.hpp>
  25 #include <iostream>
  26
  27 using std::list;
  28 using std::vector;
  29 using std::string;
  30 using std::cout;
  31 using std::max;
  32 using boost::shared_ptr;
  33 using boost::optional;
  34 using boost::dynamic_pointer_cast;
  35
  36 TextSubtitleDecoder::TextSubtitleDecoder (shared_ptr<const TextSubtitleContent> content)
  37         : TextSubtitle (content)
  38         , _next (0)
  39 {
  40         subtitle.reset (
  41                 new SubtitleDecoder (
  42                         this,
  43                         content->subtitle,
  44                         bind (&TextSubtitleDecoder::image_subtitles_during, this, _1, _2),
  45                         bind (&TextSubtitleDecoder::text_subtitles_during, this, _1, _2)
  46                         )
  47                 );
  48 }
  49
  50 void
  51 TextSubtitleDecoder::seek (ContentTime time, bool accurate)
  52 {
  53         subtitle->seek (time, accurate);
  54
  55         _next = 0;
  56         while (_next < _subtitles.size() && ContentTime::from_seconds (_subtitles[_next].from.all_as_seconds ()) < time) {
  57                 ++_next;
  58         }
  59 }
  60
  61 bool
  62 TextSubtitleDecoder::pass (PassReason, bool)
  63 {
  64         if (_next >= _subtitles.size ()) {
  65                 return true;
  66         }
  67
  68         /* XXX: we are ignoring positioning specified in the file */
  69
  70         list<dcp::SubtitleString> out;
  71
  72         /* Highest line index in this subtitle */
  73         int highest = 0;
  74         BOOST_FOREACH (sub::Line i, _subtitles[_next].lines) {
  75                 DCPOMATIC_ASSERT (i.vertical_position.reference && i.vertical_position.reference.get() == sub::TOP_OF_SUBTITLE);
  76                 DCPOMATIC_ASSERT (i.vertical_position.line);
  77                 highest = max (highest, i.vertical_position.line.get());
  78         }
  79
  80         BOOST_FOREACH (sub::Line i, _subtitles[_next].lines) {
  81                 BOOST_FOREACH (sub::Block j, i.blocks) {
  82                         out.push_back (
  83                                 dcp::SubtitleString (
  84                                         TextSubtitleContent::font_id,
  85                                         j.italic,
  86                                         j.bold,
  87                                         /* force the colour to whatever is configured */
  88                                         subtitle->content()->colour(),
  89                                         j.font_size.points (72 * 11),
  90                                         1.0,
  91                                         dcp::Time (_subtitles[_next].from.all_as_seconds(), 1000),
  92                                         dcp::Time (_subtitles[_next].to.all_as_seconds(), 1000),
  93                                         0,
  94                                         dcp::HALIGN_CENTER,
  95                                         /* This 1.015 is an arbitrary value to lift the bottom sub off the bottom
  96                                            of the screen a bit to a pleasing degree.
  97                                         */
  98                                         1.015 - ((1 + highest - i.vertical_position.line.get()) * 1.5 / 22),
  99                                         dcp::VALIGN_TOP,
 100                                         dcp::DIRECTION_LTR,
 101                                         j.text,
 102                                         subtitle->content()->outline() ? dcp::BORDER : dcp::NONE,
 103                                         subtitle->content()->outline_colour(),
 104                                         dcp::Time (0, 1000),
 105                                         dcp::Time (0, 1000)
 106                                         )
 107                                 );
 108                 }
 109         }
 110
 111         subtitle->give_text (content_time_period (_subtitles[_next]), out);
 112
 113         ++_next;
 114         return false;
 115 }
 116
 117 list<ContentTimePeriod>
 118 TextSubtitleDecoder::image_subtitles_during (ContentTimePeriod, bool) const
 119 {
 120         return list<ContentTimePeriod> ();
 121 }
 122
 123 list<ContentTimePeriod>
 124 TextSubtitleDecoder::text_subtitles_during (ContentTimePeriod p, bool starting) const
 125 {
 126         /* XXX: inefficient */
 127
 128         list<ContentTimePeriod> d;
 129
 130         for (vector<sub::Subtitle>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
 131                 ContentTimePeriod t = content_time_period (*i);
 132                 if ((starting && p.contains (t.from)) || (!starting && p.overlaps (t))) {
 133                         d.push_back (t);
 134                 }
 135         }
 136
 137         return d;
 138 }
 139
 140 ContentTimePeriod
 141 TextSubtitleDecoder::content_time_period (sub::Subtitle s) const
 142 {
 143         return ContentTimePeriod (
 144                 ContentTime::from_seconds (s.from.all_as_seconds()),
 145                 ContentTime::from_seconds (s.to.all_as_seconds())
 146                 );
 147 }