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