src/combine.cc

   1 /*
   2     Copyright (C) 2020-2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of libdcp.
   5
   6     libdcp is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     libdcp is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with libdcp.  If not, see <http://www.gnu.org/licenses/>.
  18
  19     In addition, as a special exception, the copyright holders give
  20     permission to link the code of portions of this program with the
  21     OpenSSL library under certain conditions as described in each
  22     individual source file, and distribute linked combinations
  23     including the two.
  24
  25     You must obey the GNU General Public License in all respects
  26     for all of the code used other than OpenSSL.  If you modify
  27     file(s) with this exception, you may extend this exception to your
  28     version of the file(s), but you are not obligated to do so.  If you
  29     do not wish to do so, delete this exception statement from your
  30     version.  If you delete this exception statement from all source
  31     files in the program, then also delete it here.
  32 */
  33
  34
  35 #include "asset.h"
  36 #include "combine.h"
  37 #include "cpl.h"
  38 #include "dcp.h"
  39 #include "dcp_assert.h"
  40 #include "exceptions.h"
  41 #include "font_asset.h"
  42 #include "interop_subtitle_asset.h"
  43 #include "raw_convert.h"
  44 #include <boost/filesystem.hpp>
  45 #include <boost/foreach.hpp>
  46 #include <set>
  47 #include <string>
  48 #include <vector>
  49
  50
  51 using std::map;
  52 using std::set;
  53 using std::string;
  54 using std::vector;
  55 using std::dynamic_pointer_cast;
  56 using boost::optional;
  57 using std::shared_ptr;
  58
  59
  60 boost::filesystem::path
  61 make_unique (boost::filesystem::path path)
  62 {
  63         if (!boost::filesystem::exists(path)) {
  64                 return path;
  65         }
  66
  67         for (int i = 0; i < 10000; ++i) {
  68                 boost::filesystem::path p = path.parent_path() / (path.stem().string() + dcp::raw_convert<string>(i) + path.extension().string());
  69                 if (!boost::filesystem::exists(p)) {
  70                         return p;
  71                 }
  72         }
  73
  74         DCP_ASSERT (false);
  75         return path;
  76 }
  77
  78
  79 static
  80 void
  81 create_hard_link_or_copy (boost::filesystem::path from, boost::filesystem::path to)
  82 {
  83         try {
  84                 create_hard_link (from, to);
  85         } catch (boost::filesystem::filesystem_error& e) {
  86                 if (e.code() == boost::system::errc::cross_device_link) {
  87                         copy_file (from, to);
  88                 } else {
  89                         throw;
  90                 }
  91         }
  92 }
  93
  94
  95 void
  96 dcp::combine (
  97         vector<boost::filesystem::path> inputs,
  98         boost::filesystem::path output,
  99         string issuer,
 100         string creator,
 101         string issue_date,
 102         string annotation_text,
 103         shared_ptr<const CertificateChain> signer
 104         )
 105 {
 106         using namespace boost::filesystem;
 107
 108         DCP_ASSERT (!inputs.empty());
 109
 110         DCP output_dcp (output);
 111         optional<dcp::Standard> standard;
 112
 113         BOOST_FOREACH (path i, inputs) {
 114                 DCP dcp (i);
 115                 dcp.read ();
 116                 if (!standard) {
 117                         standard = *dcp.standard();
 118                 } else if (standard != dcp.standard()) {
 119                         throw CombineError ("Cannot combine Interop and SMPTE DCPs.");
 120                 }
 121         }
 122
 123         vector<path> paths;
 124         vector<shared_ptr<dcp::Asset>> assets;
 125
 126         BOOST_FOREACH (path i, inputs) {
 127                 DCP dcp (i);
 128                 dcp.read ();
 129
 130                 BOOST_FOREACH (shared_ptr<dcp::CPL> j, dcp.cpls()) {
 131                         output_dcp.add (j);
 132                 }
 133
 134                 BOOST_FOREACH (shared_ptr<dcp::Asset> j, dcp.assets(true)) {
 135                         if (dynamic_pointer_cast<dcp::CPL>(j)) {
 136                                 continue;
 137                         }
 138
 139                         optional<path> file = j->file();
 140                         DCP_ASSERT (file);
 141                         path new_path = make_unique(output / file->filename());
 142
 143                         shared_ptr<dcp::InteropSubtitleAsset> sub = dynamic_pointer_cast<dcp::InteropSubtitleAsset>(j);
 144                         if (sub) {
 145                                 /* Interop fonts are really fiddly.  The font files are assets (in the ASSETMAP)
 146                                  * and also linked from the font XML by filename.  We have to fix both these things,
 147                                  * and re-write the font XML file since the font URI might have changed if it's a duplicate
 148                                  * with another DCP.
 149                                  */
 150                                 map<string, path> fonts = sub->font_filenames ();
 151                                 for (map<string, path>::const_iterator k = fonts.begin(); k != fonts.end(); ++k) {
 152                                         sub->set_font_file (k->first, make_unique(output / k->second.filename()));
 153                                 }
 154                                 sub->write (new_path);
 155                         } else if (!dynamic_pointer_cast<dcp::FontAsset>(j)) {
 156                                 /* Take care of everything else that's not a Interop subtitle asset, Interop font file
 157                                  * or CPL.
 158                                  */
 159                                 optional<path> file = j->file();
 160                                 DCP_ASSERT (file);
 161                                 path new_path = make_unique(output / file->filename());
 162                                 create_hard_link_or_copy (*file, new_path);
 163                                 j->set_file (new_path);
 164                         }
 165
 166                         assets.push_back (j);
 167                 }
 168         }
 169
 170         output_dcp.resolve_refs (assets);
 171         output_dcp.write_xml (*standard, issuer, creator, issue_date, annotation_text, signer);
 172 }