src/combine.cc

   1 /*
   2     Copyright (C) 2020 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::list;
  52 using std::map;
  53 using std::set;
  54 using std::string;
  55 using std::vector;
  56 using boost::dynamic_pointer_cast;
  57 using boost::optional;
  58 using boost::shared_ptr;
  59
  60
  61 boost::filesystem::path
  62 make_unique (boost::filesystem::path path)
  63 {
  64         if (!boost::filesystem::exists(path)) {
  65                 return path;
  66         }
  67
  68         for (int i = 0; i < 10000; ++i) {
  69                 boost::filesystem::path p = path.parent_path() / (path.stem().string() + dcp::raw_convert<string>(i) + path.extension().string());
  70                 if (!boost::filesystem::exists(p)) {
  71                         return p;
  72                 }
  73         }
  74
  75         DCP_ASSERT (false);
  76         return path;
  77 }
  78
  79
  80 static
  81 void
  82 create_hard_link_or_copy (boost::filesystem::path from, boost::filesystem::path to)
  83 {
  84         try {
  85                 create_hard_link (from, to);
  86         } catch (boost::filesystem::filesystem_error& e) {
  87                 if (e.code() == boost::system::errc::cross_device_link) {
  88                         copy_file (from, to);
  89                 } else {
  90                         throw;
  91                 }
  92         }
  93 }
  94
  95
  96 void
  97 dcp::combine (vector<boost::filesystem::path> inputs, boost::filesystem::path output, shared_ptr<const CertificateChain> signer)
  98 {
  99         using namespace boost::filesystem;
 100
 101         DCP_ASSERT (!inputs.empty());
 102
 103         DCP output_dcp (output);
 104         optional<dcp::Standard> standard;
 105
 106         BOOST_FOREACH (path i, inputs) {
 107                 DCP dcp (i);
 108                 dcp.read ();
 109                 if (!standard) {
 110                         standard = *dcp.standard();
 111                 } else if (standard != dcp.standard()) {
 112                         throw CombineError ("Cannot combine Interop and SMPTE DCPs.");
 113                 }
 114         }
 115
 116         list<path> paths;
 117         list<shared_ptr<dcp::Asset> > assets;
 118
 119         BOOST_FOREACH (path i, inputs) {
 120                 DCP dcp (i);
 121                 dcp.read ();
 122
 123                 BOOST_FOREACH (shared_ptr<dcp::CPL> j, dcp.cpls()) {
 124                         output_dcp.add (j);
 125                 }
 126
 127                 BOOST_FOREACH (shared_ptr<dcp::Asset> j, dcp.assets(true)) {
 128                         if (dynamic_pointer_cast<dcp::CPL>(j)) {
 129                                 continue;
 130                         }
 131
 132                         optional<path> file = j->file();
 133                         DCP_ASSERT (file);
 134                         path new_path = make_unique(output / file->filename());
 135
 136                         shared_ptr<dcp::InteropSubtitleAsset> sub = dynamic_pointer_cast<dcp::InteropSubtitleAsset>(j);
 137                         if (sub) {
 138                                 /* Interop fonts are really fiddly.  The font files are assets (in the ASSETMAP)
 139                                  * and also linked from the font XML by filename.  We have to fix both these things,
 140                                  * and re-write the font XML file since the font URI might have changed if it's a duplicate
 141                                  * with another DCP.
 142                                  */
 143                                 map<string, path> fonts = sub->font_filenames ();
 144                                 for (map<string, path>::const_iterator k = fonts.begin(); k != fonts.end(); ++k) {
 145                                         sub->set_font_file (k->first, make_unique(output / k->second.filename()));
 146                                 }
 147                                 sub->write (new_path);
 148                         } else if (!dynamic_pointer_cast<dcp::FontAsset>(j)) {
 149                                 /* Take care of everything else that's not a Interop subtitle asset, Interop font file
 150                                  * or CPL.
 151                                  */
 152                                 optional<path> file = j->file();
 153                                 DCP_ASSERT (file);
 154                                 path new_path = make_unique(output / file->filename());
 155                                 create_hard_link_or_copy (*file, new_path);
 156                                 j->set_file (new_path);
 157                         }
 158
 159                         assets.push_back (j);
 160                 }
 161         }
 162
 163         output_dcp.resolve_refs (assets);
 164         output_dcp.write_xml (*standard, dcp::XMLMetadata(), signer);
 165 }