2 Copyright (C) 2012-2021 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
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35 #ifndef LIBDCP_SMPTE_SUBTITLE_ASSET_H
36 #define LIBDCP_SMPTE_SUBTITLE_ASSET_H
39 /** @file src/smpte_subtitle_asset.h
40 * @brief SMPTESubtitleAsset class
44 #include "subtitle_asset.h"
45 #include "language_tag.h"
46 #include "local_time.h"
48 #include "crypto_context.h"
49 #include <boost/filesystem.hpp>
59 struct verify_invalid_language1;
60 struct verify_invalid_language2;
66 class SMPTELoadFontNode;
69 /** @class SMPTESubtitleAsset
70 * @brief A set of subtitles to be read and/or written in the SMPTE format
72 class SMPTESubtitleAsset : public SubtitleAsset, public MXF
75 SMPTESubtitleAsset ();
77 /** Construct a SMPTESubtitleAsset by reading an MXF or XML file
78 * @param file Filename
80 explicit SMPTESubtitleAsset (boost::filesystem::path file);
83 std::shared_ptr<const Asset>,
88 std::vector<std::shared_ptr<LoadFontNode>> load_font_nodes () const override;
90 std::string xml_as_string () const override;
92 /** Write this content to a MXF file */
93 void write (boost::filesystem::path path) const override;
95 void add (std::shared_ptr<Subtitle>) override;
96 void add_font (std::string id, dcp::ArrayData data) override;
97 void set_key (Key key) override;
99 void set_content_title_text (std::string t) {
100 _content_title_text = t;
103 void set_language (dcp::LanguageTag l) {
104 _language = l.to_string();
107 void set_issue_date (LocalTime t) {
111 void set_reel_number (int r) {
115 void set_edit_rate (Fraction e) {
119 void set_time_code_rate (int t) {
123 void set_start_time (Time t) {
127 void set_intrinsic_duration (int64_t d) {
128 _intrinsic_duration = d;
131 int64_t intrinsic_duration () const {
132 return _intrinsic_duration;
135 /** @return title of the film that these subtitles are for,
136 * to be presented to the user
138 std::string content_title_text () const {
139 return _content_title_text;
142 /** @return Language, if one was set. This should be a xs:language, but
143 * it might not be if a non-compliant DCP was read in.
145 boost::optional<std::string> language () const {
149 /** @return annotation text, to be presented to the user */
150 boost::optional<std::string> annotation_text () const {
151 return _annotation_text;
154 /** @return file issue time and date */
155 LocalTime issue_date () const {
159 boost::optional<int> reel_number () const {
163 Fraction edit_rate () const {
167 /** @return subdivision of 1 second that is used for subtitle times;
168 * e.g. a time_code_rate of 250 means that a subtitle time of 0:0:0:001
171 int time_code_rate () const override {
172 return _time_code_rate;
175 boost::optional<Time> start_time () const {
179 /** @return ID from XML's <Id> tag, or the <Id> that will be used when writing the XML,
180 * or boost::none if this content is encrypted and no key is available.
182 boost::optional<std::string> xml_id () const {
186 /** @return ResourceID read from any MXF that was read */
187 boost::optional<std::string> resource_id () const {
191 static bool valid_mxf (boost::filesystem::path);
192 static std::string static_pkl_type (Standard) {
193 return "application/mxf";
198 std::string pkl_type (Standard s) const override {
199 return static_pkl_type (s);
203 friend struct ::write_smpte_subtitle_test;
204 friend struct ::write_smpte_subtitle_test2;
205 friend struct ::verify_invalid_language1;
206 friend struct ::verify_invalid_language2;
208 void read_fonts (std::shared_ptr<ASDCP::TimedText::MXFReader>);
209 void parse_xml (std::shared_ptr<cxml::Document> xml);
210 void read_mxf_descriptor (std::shared_ptr<ASDCP::TimedText::MXFReader> reader);
211 void read_mxf_resources (std::shared_ptr<ASDCP::TimedText::MXFReader> reader, std::shared_ptr<DecryptionContext> dec);
213 /** The total length of this content in video frames. The amount of
214 * content presented may be less than this.
216 int64_t _intrinsic_duration = 0;
217 /** <ContentTitleText> from the asset */
218 std::string _content_title_text;
219 /** This is stored and returned as a string so that we can tolerate non-RFC-5646 strings,
220 * but must be set as a dcp::LanguageTag to try to ensure that we create compliant output.
222 boost::optional<std::string> _language;
223 boost::optional<std::string> _annotation_text;
224 LocalTime _issue_date;
225 boost::optional<int> _reel_number;
227 int _time_code_rate = 0;
228 boost::optional<Time> _start_time;
230 std::vector<std::shared_ptr<SMPTELoadFontNode>> _load_font_nodes;
231 /** UUID for the XML inside the MXF, which should be the same as the ResourceID in the MXF (our _resource_id)
232 * but different to the AssetUUID in the MXF (our _id) according to SMPTE Bv2.1 and Doremi's 2.8.18 release notes.
233 * May be boost::none if this object has been made from an encrypted object without a key.
235 boost::optional<std::string> _xml_id;
237 /** ResourceID read from the MXF, if there was one */
238 boost::optional<std::string> _resource_id;