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 std::string;
  27 using boost::shared_ptr;
  28 using boost::optional;
  29
  30 SubRipDecoder::SubRipDecoder (shared_ptr<const SubRipContent> content)
  31         : SubtitleDecoder (content)
  32         , SubRip (content)
  33         , _next (0)
  34 {
  35
  36 }
  37
  38 void
  39 SubRipDecoder::seek (ContentTime time, bool accurate)
  40 {
  41         SubtitleDecoder::seek (time, accurate);
  42
  43         _next = 0;
  44         while (_next < _subtitles.size() && ContentTime::from_seconds (_subtitles[_next].from.metric().get().all_as_seconds ()) < time) {
  45                 ++_next;
  46         }
  47 }
  48
  49 bool
  50 SubRipDecoder::pass ()
  51 {
  52         if (_next >= _subtitles.size ()) {
  53                 return true;
  54         }
  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
  60                         dcp::VAlign va = dcp::TOP;
  61                         if (i->vertical_position.reference) {
  62                                 switch (i->vertical_position.reference.get ()) {
  63                                 case sub::TOP_OF_SCREEN:
  64                                         va = dcp::TOP;
  65                                         break;
  66                                 case sub::CENTRE_OF_SCREEN:
  67                                         va = dcp::CENTER;
  68                                         break;
  69                                 case sub::BOTTOM_OF_SCREEN:
  70                                         va = dcp::BOTTOM;
  71                                 }
  72                         }
  73
  74                         out.push_back (
  75                                 dcp::SubtitleString (
  76                                         SubRipContent::font_id,
  77                                         j->italic,
  78                                         dcp::Color (255, 255, 255),
  79                                         j->font_size,
  80                                         dcp::Time (rint (_subtitles[_next].from.metric().get().all_as_milliseconds() / 4)),
  81                                         dcp::Time (rint (_subtitles[_next].to.metric().get().all_as_milliseconds() / 4)),
  82                                         i->vertical_position.line.get() * (1.5 / 22) + 0.8,
  83                                         va,
  84                                         j->text,
  85                                         dcp::NONE,
  86                                         dcp::Color (255, 255, 255),
  87                                         0,
  88                                         0
  89                                         )
  90                                 );
  91                 }
  92         }
  93
  94         text_subtitle (out);
  95         ++_next;
  96         return false;
  97 }
  98
  99 list<ContentTimePeriod>
 100 SubRipDecoder::subtitles_during (ContentTimePeriod p, bool starting) const
 101 {
 102         /* XXX: inefficient */
 103
 104         list<ContentTimePeriod> d;
 105
 106         for (vector<sub::Subtitle>::const_iterator i = _subtitles.begin(); i != _subtitles.end(); ++i) {
 107
 108                 ContentTimePeriod t (
 109                         ContentTime::from_seconds (i->from.metric().get().all_as_seconds()),
 110                         ContentTime::from_seconds (i->to.metric().get().all_as_seconds())
 111                         );
 112
 113                 if ((starting && p.contains (t.from)) || (!starting && p.overlaps (t))) {
 114                         d.push_back (t);
 115                 }
 116         }
 117
 118         return d;
 119 }