2 Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
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.
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.
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/>.
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
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.
40 #ifndef LIBDCP_ASSET_H
41 #define LIBDCP_ASSET_H
47 #include <boost/filesystem.hpp>
48 #include <boost/function.hpp>
49 #include <boost/optional.hpp>
64 class EqualityOptions;
68 * @brief Parent class for DCP assets, i.e. picture, sound, subtitles, closed captions, CPLs, fonts
70 * Note that this class is not used for ReelAssets; those are just for the metadata
71 * that gets put into <Reel>s.
73 class Asset : public Object
76 /** Create an Asset with a randomly-generated ID */
79 /** Create an Asset from a given file with a randomly-generated ID
80 * @param file File name
82 explicit Asset (boost::filesystem::path file);
84 /** Create an Asset from a given file with a given ID
86 * @param file File name
88 Asset (std::string id, boost::filesystem::path file);
91 std::shared_ptr<const Asset> other,
92 EqualityOptions const& opt,
96 virtual void add_to_assetmap (AssetMap& asset_map, boost::filesystem::path root) const;
98 virtual void add_to_pkl (std::shared_ptr<PKL> pkl, boost::filesystem::path root) const;
100 /** @return the most recent disk file used to read or write this asset, if there is one */
101 boost::optional<boost::filesystem::path> file () const {
105 /** Set the file that holds this asset on disk. Calling this function
106 * clears this object's store of its hash, so you should call ::hash
109 * @param file New file's path.
111 void set_file (boost::filesystem::path file) const;
113 /** Set the file that holds this asset on disk. Calling this function
114 * preserves the object's store of its hash, so if the object already
115 * has a hash it is up to the caller to ensure that the new file has
118 * @param file New file's path.
120 void set_file_preserving_hash(boost::filesystem::path file) const;
122 /** Set the file that holds this asset on disk. The new file must
123 * be exactly the same as the old one, as this function assumes
124 * that the object's hash does not change.
126 * @param file New file's path.
128 void rename_file(boost::filesystem::path file);
130 /** Calculate the hash of this asset's file, if it has not already been calculated,
132 * @param progress Function that will be called with a parameter between 0 and 1 to indicate
133 * progress in the calculation
136 std::string hash (boost::function<void (float)> progress = {}) const;
138 void set_hash (std::string hash);
143 /** The most recent disk file used to read or write this asset */
144 mutable boost::optional<boost::filesystem::path> _file;
146 static void add_file_to_assetmap (AssetMap& asset_map, boost::filesystem::path root, boost::filesystem::path file, std::string id);
149 friend struct ::asset_test;
151 /** @return type string for PKLs for this asset */
152 virtual std::string pkl_type (Standard standard) const = 0;
154 /** Hash of _file if it has been computed */
155 mutable boost::optional<std::string> _hash;