src/lib/subrip_decoder.cc

   1 /*
   2     Copyright (C) 2014 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 <dcp/subtitle_string.h>
  21 #include "subrip_decoder.h"
  22 #include "subrip_content.h"
  23
  24 using std::list;
  25 using std::vector;
  26 using boost::shared_ptr;
  27
  28 SubRipDecoder::SubRipDecoder (shared_ptr<const SubRipContent> content)
  29         : SubtitleDecoder (content)
  30         , SubRip (content)
  31         , _next (0)
  32 {
  33
  34 }
  35
  36 void
  37 SubRipDecoder::seek (ContentTime time, bool accurate)
  38 {
  39         SubtitleDecoder::seek (time, accurate);
  40
  41         _next = 0;
  42         while (_next < _subtitles.size() && ContentTime::from_seconds (_subtitles[_next].from.metric().get().all_as_seconds ()) < time) {
  43                 ++_next;
  44         }
  45 }
  46
  47 bool
  48 SubRipDecoder::pass ()
  49 {
  50         if (_next >= _subtitles.size ()) {
  51                 return true;
  52         }
  53
  54         /* XXX: we are ignoring positioning specified in the file */
  55
  56         list<dcp::SubtitleString> out;
  57         for (list<sub::Line>::const_iterator i = _subtitles[_next].lines.begin(); i != _subtitles[_next].lines.end(); ++i) {
  58                 for (list<sub::Block>::const_iterator j = i->blocks.begin(); j != i->blocks.end(); ++j) {
  59                         out.push_back (
  60                                 dcp::SubtitleString (
  61                                         "Arial",
  62                                         j->italic,
  63                                         dcp::Color (255, 255, 255),
  64                                         /* .srt files don't specify size, so this is an arbitrary value */
  65                                         48,
  66                                         dcp::Time (rint (_subtitles[_next].from.metric().get().all_as_milliseconds() / 4)),
  67                                         dcp::Time (rint (_subtitles[_next].to.metric().get().all_as_milliseconds() / 4)),
  68                                         i->vertical_position.line.get() * (1.5 / 22) + 0.8,
  69                                         dcp::TOP,
  70                                         j->text,
  71                                         dcp::NONE,
  72                                         dcp::Color (255, 255, 255),
  73                                         0,
  74                                         0
  75                                         )
  76                                 );
  77                 }
  78         }
  79
  80         text_subtitle (out);
  81         ++_next;
  82         return false;
  83 }
  84
  85 list<ContentTimePeriod>
  86 SubRipDecoder::subtitles_during (ContentTimePeriod p, bool starting) const
  87 {
  88         /* XXX: inefficient */
  89
  90         list<ContentTimePeriod> d;
  91
  92         for (vector<sub::Subtitle>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
  93
  94                 ContentTimePeriod t (
  95                         ContentTime::from_seconds (i->from.metric().get().all_as_seconds()),
  96                         ContentTime::from_seconds (i->to.metric().get().all_as_seconds())
  97                         );
  98
  99                 if ((starting && p.contains (t.from)) || (!starting && p.overlaps (t))) {
 100                         d.push_back (t);
 101                 }
 102         }
 103
 104         return d;
 105 }