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;
61 struct write_subtitles_in_vertical_order_with_top_alignment;
62 struct write_subtitles_in_vertical_order_with_bottom_alignment;
68 class SMPTELoadFontNode;
71 /** @class SMPTESubtitleAsset
72 * @brief A set of subtitles to be read and/or written in the SMPTE format
74 class SMPTESubtitleAsset : public SubtitleAsset, public MXF
77 SMPTESubtitleAsset ();
79 /** Construct a SMPTESubtitleAsset by reading an MXF or XML file
80 * @param file Filename
82 explicit SMPTESubtitleAsset (boost::filesystem::path file);
85 std::shared_ptr<const Asset>,
90 std::vector<std::shared_ptr<LoadFontNode>> load_font_nodes () const override;
92 std::string xml_as_string () const override;
94 /** Write this content to a MXF file */
95 void write (boost::filesystem::path path) const override;
97 void add (std::shared_ptr<Subtitle>) override;
98 void add_font (std::string id, dcp::ArrayData data) override;
99 void set_key (Key key) override;
101 void set_content_title_text (std::string t) {
102 _content_title_text = t;
105 void set_language (dcp::LanguageTag l) {
106 _language = l.to_string();
109 void set_issue_date (LocalTime t) {
113 void set_reel_number (int r) {
117 void set_edit_rate (Fraction e) {
121 void set_time_code_rate (int t) {
125 void set_start_time (Time t) {
129 void set_intrinsic_duration (int64_t d) {
130 _intrinsic_duration = d;
133 int64_t intrinsic_duration () const {
134 return _intrinsic_duration;
137 /** @return title of the film that these subtitles are for,
138 * to be presented to the user
140 std::string content_title_text () const {
141 return _content_title_text;
144 /** @return Language, if one was set. This should be a xs:language, but
145 * it might not be if a non-compliant DCP was read in.
147 boost::optional<std::string> language () const {
151 /** @return annotation text, to be presented to the user */
152 boost::optional<std::string> annotation_text () const {
153 return _annotation_text;
156 /** @return file issue time and date */
157 LocalTime issue_date () const {
161 boost::optional<int> reel_number () const {
165 Fraction edit_rate () const {
169 /** @return subdivision of 1 second that is used for subtitle times;
170 * e.g. a time_code_rate of 250 means that a subtitle time of 0:0:0:001
173 int time_code_rate () const override {
174 return _time_code_rate;
177 boost::optional<Time> start_time () const {
181 /** @return ID from XML's <Id> tag, or the <Id> that will be used when writing the XML,
182 * or boost::none if this content is encrypted and no key is available.
184 boost::optional<std::string> xml_id () const {
188 /** @return ResourceID read from any MXF that was read */
189 boost::optional<std::string> resource_id () const {
193 static bool valid_mxf (boost::filesystem::path);
194 static std::string static_pkl_type (Standard) {
195 return "application/mxf";
200 std::string pkl_type (Standard s) const override {
201 return static_pkl_type (s);
205 friend struct ::write_smpte_subtitle_test;
206 friend struct ::write_smpte_subtitle_test2;
207 friend struct ::verify_invalid_language1;
208 friend struct ::verify_invalid_language2;
209 friend struct ::write_subtitles_in_vertical_order_with_top_alignment;
210 friend struct ::write_subtitles_in_vertical_order_with_bottom_alignment;
212 void read_fonts (std::shared_ptr<ASDCP::TimedText::MXFReader>);
213 void parse_xml (std::shared_ptr<cxml::Document> xml);
214 void read_mxf_descriptor (std::shared_ptr<ASDCP::TimedText::MXFReader> reader);
215 void read_mxf_resources (std::shared_ptr<ASDCP::TimedText::MXFReader> reader, std::shared_ptr<DecryptionContext> dec);
217 /** The total length of this content in video frames. The amount of
218 * content presented may be less than this.
220 int64_t _intrinsic_duration = 0;
221 /** <ContentTitleText> from the asset */
222 std::string _content_title_text;
223 /** This is stored and returned as a string so that we can tolerate non-RFC-5646 strings,
224 * but must be set as a dcp::LanguageTag to try to ensure that we create compliant output.
226 boost::optional<std::string> _language;
227 boost::optional<std::string> _annotation_text;
228 LocalTime _issue_date;
229 boost::optional<int> _reel_number;
231 int _time_code_rate = 0;
232 boost::optional<Time> _start_time;
234 std::vector<std::shared_ptr<SMPTELoadFontNode>> _load_font_nodes;
235 /** UUID for the XML inside the MXF, which should be the same as the ResourceID in the MXF (our _resource_id)
236 * but different to the AssetUUID in the MXF (our _id) according to SMPTE Bv2.1 and Doremi's 2.8.18 release notes.
237 * May be boost::none if this object has been made from an encrypted object without a key.
239 boost::optional<std::string> _xml_id;
241 /** ResourceID read from the MXF, if there was one */
242 boost::optional<std::string> _resource_id;