src/dcp_reader.cc

   1 /*
   2     Copyright (C) 2014-2021 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_reader.h"
  21 #include "compose.hpp"
  22 #include "exceptions.h"
  23 #include <dcp/subtitle_string.h>
  24 #include <dcp/interop_subtitle_asset.h>
  25 #include <dcp/smpte_subtitle_asset.h>
  26 #include <boost/filesystem.hpp>
  27
  28 using std::list;
  29 using std::cout;
  30 using std::string;
  31 using std::exception;
  32 using std::shared_ptr;
  33 using boost::optional;
  34 using std::dynamic_pointer_cast;
  35 using namespace sub;
  36
  37 static Time
  38 dcp_to_sub_time (dcp::Time t)
  39 {
  40         return Time::from_hms (t.h, t.m, t.s, t.e * 1000.0 / t.tcr);
  41 }
  42
  43 static Colour
  44 dcp_to_sub_colour (dcp::Colour c)
  45 {
  46         return Colour (c.r / 255.0, c.g / 255.0, c.b / 255.0);
  47 }
  48
  49 DCPReader::DCPReader (boost::filesystem::path file)
  50 {
  51         shared_ptr<dcp::SubtitleAsset> sc;
  52         string interop_error;
  53         string smpte_error;
  54
  55         try {
  56                 sc.reset (new dcp::InteropSubtitleAsset (file));
  57         } catch (exception& e) {
  58                 interop_error = e.what ();
  59         }
  60
  61         if (!sc) {
  62                 try {
  63                         sc.reset (new dcp::SMPTESubtitleAsset (file));
  64                 } catch (exception& e) {
  65                         smpte_error = e.what();
  66                 }
  67         }
  68
  69         if (!sc) {
  70                 throw DCPError (String::compose ("Could not read subtitles (%1 / %2)", interop_error, smpte_error));
  71         }
  72
  73
  74         for (auto i: sc->subtitles()) {
  75
  76                 /* We don't deal with image subs */
  77                 auto is = dynamic_pointer_cast<dcp::SubtitleString>(i);
  78                 if (!is) {
  79                         continue;
  80                 }
  81
  82                 RawSubtitle rs;
  83                 rs.text = is->text ();
  84                 rs.font = is->font ();
  85                 rs.font_size = FontSize::from_proportional (is->size() / (72.0 * 11.0));
  86
  87                 switch (is->effect ()) {
  88                 case dcp::BORDER:
  89                         rs.effect = BORDER;
  90                         break;
  91                 case dcp::SHADOW:
  92                         rs.effect = SHADOW;
  93                         break;
  94                 default:
  95                         break;
  96                 }
  97
  98                 rs.effect_colour = dcp_to_sub_colour (is->effect_colour());
  99
 100                 rs.colour = dcp_to_sub_colour (is->colour());
 101                 rs.bold = is->bold ();
 102                 rs.italic = is->italic ();
 103                 rs.underline = is->underline ();
 104
 105                 switch (is->h_align()) {
 106                 case dcp::HALIGN_LEFT:
 107                         rs.horizontal_position.reference = LEFT_OF_SCREEN;
 108                         break;
 109                 case dcp::HALIGN_CENTER:
 110                         rs.horizontal_position.reference = HORIZONTAL_CENTRE_OF_SCREEN;
 111                         break;
 112                 case dcp::HALIGN_RIGHT:
 113                         rs.horizontal_position.reference = RIGHT_OF_SCREEN;
 114                         break;
 115                 }
 116
 117                 rs.vertical_position.proportional = is->v_position();
 118                 switch (is->v_align()) {
 119                 case dcp::VALIGN_TOP:
 120                         rs.vertical_position.reference = TOP_OF_SCREEN;
 121                         break;
 122                 case dcp::VALIGN_CENTER:
 123                         rs.vertical_position.reference = VERTICAL_CENTRE_OF_SCREEN;
 124                         break;
 125                 case dcp::VALIGN_BOTTOM:
 126                         rs.vertical_position.reference = BOTTOM_OF_SCREEN;
 127                         break;
 128                 }
 129
 130                 rs.from = dcp_to_sub_time (is->in ());
 131                 rs.to = dcp_to_sub_time (is->out ());
 132
 133                 rs.fade_up = dcp_to_sub_time (is->fade_up_time ());
 134                 rs.fade_down = dcp_to_sub_time (is->fade_down_time ());
 135
 136                 _subs.push_back (rs);
 137         }
 138 }