2 Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * @brief A representation of some audio and video content, and details of
22 * how they should be presented in a DCP.
28 #include "job_manager.h"
29 #include "transcode_job.h"
30 #include "scp_dcp_job.h"
32 #include "exceptions.h"
33 #include "examine_content_job.h"
36 #include "ui_signaller.h"
39 #include "dcp_content_type.h"
43 #include "safe_stringstream.h"
44 #include "environment_info.h"
45 #include <libcxml/cxml.h>
47 #include <dcp/signer.h>
49 #include <dcp/local_time.h>
50 #include <dcp/raw_convert.h>
51 #include <dcp/decrypted_kdm.h>
52 #include <libxml++/libxml++.h>
53 #include <boost/filesystem.hpp>
54 #include <boost/algorithm/string.hpp>
55 #include <boost/lexical_cast.hpp>
56 #include <boost/foreach.hpp>
80 using boost::shared_ptr;
81 using boost::weak_ptr;
82 using boost::dynamic_pointer_cast;
83 using boost::to_upper_copy;
84 using boost::ends_with;
85 using boost::starts_with;
86 using boost::optional;
87 using boost::is_any_of;
90 using dcp::raw_convert;
91 using dcp::raw_convert;
93 #define LOG_GENERAL(...) log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
94 #define LOG_GENERAL_NC(...) log()->log (__VA_ARGS__, Log::TYPE_GENERAL);
97 * AudioMapping XML changed.
99 * Subtitle offset changed to subtitle y offset, and subtitle x offset added.
101 * Use <Scale> tag in <VideoContent> rather than <Ratio>.
105 * Subtitle X and Y scale.
107 * Bumped to 32 for 2.0 branch; some times are expressed in Times rather
110 int const Film::current_state_version = 32;
112 /** Construct a Film object in a given directory.
114 * @param dir Film directory.
117 Film::Film (boost::filesystem::path dir, bool log)
118 : _playlist (new Playlist)
119 , _use_isdcf_name (true)
120 , _dcp_content_type (Config::instance()->default_dcp_content_type ())
121 , _container (Config::instance()->default_container ())
122 , _resolution (RESOLUTION_2K)
123 , _scaler (Scaler::from_id ("bicubic"))
126 , _j2k_bandwidth (Config::instance()->default_j2k_bandwidth ())
127 , _isdcf_metadata (Config::instance()->default_isdcf_metadata ())
128 , _video_frame_rate (24)
129 , _audio_channels (6)
131 , _sequence_video (true)
133 , _burn_subtitles (false)
134 , _state_version (current_state_version)
137 set_isdcf_date_today ();
139 _playlist_changed_connection = _playlist->Changed.connect (bind (&Film::playlist_changed, this));
140 _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Film::playlist_content_changed, this, _1, _2));
142 /* Make state.directory a complete path without ..s (where possible)
143 (Code swiped from Adam Bowen on stackoverflow)
146 boost::filesystem::path p (boost::filesystem::system_complete (dir));
147 boost::filesystem::path result;
148 for (boost::filesystem::path::iterator i = p.begin(); i != p.end(); ++i) {
150 if (boost::filesystem::is_symlink (result) || result.filename() == "..") {
153 result = result.parent_path ();
155 } else if (*i != ".") {
160 set_directory (result.make_preferred ());
162 _log.reset (new FileLog (file ("log")));
164 _log.reset (new NullLog);
167 _playlist->set_sequence_video (_sequence_video);
172 for (list<boost::signals2::connection>::const_iterator i = _job_connections.begin(); i != _job_connections.end(); ++i) {
178 Film::video_identifier () const
180 DCPOMATIC_ASSERT (container ());
183 s.imbue (std::locale::classic ());
185 s << container()->id()
186 << "_" << resolution_to_string (_resolution)
187 << "_" << _playlist->video_identifier()
188 << "_" << _video_frame_rate
189 << "_" << scaler()->id()
190 << "_" << j2k_bandwidth();
204 if (_burn_subtitles) {
215 /** @return The path to the directory to write video frame info files to */
216 boost::filesystem::path
217 Film::info_dir () const
219 boost::filesystem::path p;
221 p /= video_identifier ();
225 boost::filesystem::path
226 Film::internal_video_mxf_dir () const
228 return dir ("video");
231 boost::filesystem::path
232 Film::internal_video_mxf_filename () const
234 return video_identifier() + ".mxf";
237 boost::filesystem::path
238 Film::video_mxf_filename () const
240 return filename_safe_name() + "_video.mxf";
243 boost::filesystem::path
244 Film::audio_mxf_filename () const
246 return filename_safe_name() + "_audio.mxf";
249 boost::filesystem::path
250 Film::subtitle_xml_filename () const
252 return filename_safe_name() + "_subtitle.xml";
256 Film::filename_safe_name () const
258 string const n = name ();
260 for (size_t i = 0; i < n.length(); ++i) {
261 if (isalnum (n[i])) {
271 boost::filesystem::path
272 Film::audio_analysis_dir () const
274 return dir ("analysis");
277 /** Add suitable Jobs to the JobManager to create a DCP for this Film */
281 set_isdcf_date_today ();
283 if (dcp_name().find ("/") != string::npos) {
284 throw BadSettingError (_("name"), _("cannot contain slashes"));
287 environment_info (log ());
289 ContentList cl = content ();
290 for (ContentList::const_iterator i = cl.begin(); i != cl.end(); ++i) {
291 LOG_GENERAL ("Content: %1", (*i)->technical_summary());
293 LOG_GENERAL ("DCP video rate %1 fps", video_frame_rate());
294 LOG_GENERAL ("%1 threads", Config::instance()->num_local_encoding_threads());
295 LOG_GENERAL ("J2K bandwidth %1", j2k_bandwidth());
297 if (container() == 0) {
298 throw MissingSettingError (_("container"));
301 if (content().empty()) {
302 throw StringError (_("You must add some content to the DCP before creating it"));
305 if (dcp_content_type() == 0) {
306 throw MissingSettingError (_("content type"));
309 if (name().empty()) {
310 throw MissingSettingError (_("name"));
313 JobManager::instance()->add (shared_ptr<Job> (new TranscodeJob (shared_from_this())));
316 /** Start a job to send our DCP to the configured TMS */
318 Film::send_dcp_to_tms ()
320 shared_ptr<Job> j (new SCPDCPJob (shared_from_this()));
321 JobManager::instance()->add (j);
324 /** Count the number of frames that have been encoded for this film.
325 * @return frame count.
328 Film::encoded_frames () const
330 if (container() == 0) {
335 for (boost::filesystem::directory_iterator i = boost::filesystem::directory_iterator (info_dir ()); i != boost::filesystem::directory_iterator(); ++i) {
337 boost::this_thread::interruption_point ();
343 shared_ptr<xmlpp::Document>
344 Film::metadata () const
346 shared_ptr<xmlpp::Document> doc (new xmlpp::Document);
347 xmlpp::Element* root = doc->create_root_node ("Metadata");
349 root->add_child("Version")->add_child_text (raw_convert<string> (current_state_version));
350 root->add_child("Name")->add_child_text (_name);
351 root->add_child("UseISDCFName")->add_child_text (_use_isdcf_name ? "1" : "0");
353 if (_dcp_content_type) {
354 root->add_child("DCPContentType")->add_child_text (_dcp_content_type->isdcf_name ());
358 root->add_child("Container")->add_child_text (_container->id ());
361 root->add_child("Resolution")->add_child_text (resolution_to_string (_resolution));
362 root->add_child("Scaler")->add_child_text (_scaler->id ());
363 root->add_child("J2KBandwidth")->add_child_text (raw_convert<string> (_j2k_bandwidth));
364 _isdcf_metadata.as_xml (root->add_child ("ISDCFMetadata"));
365 root->add_child("VideoFrameRate")->add_child_text (raw_convert<string> (_video_frame_rate));
366 root->add_child("ISDCFDate")->add_child_text (boost::gregorian::to_iso_string (_isdcf_date));
367 root->add_child("AudioChannels")->add_child_text (raw_convert<string> (_audio_channels));
368 root->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
369 root->add_child("SequenceVideo")->add_child_text (_sequence_video ? "1" : "0");
370 root->add_child("Interop")->add_child_text (_interop ? "1" : "0");
371 root->add_child("BurnSubtitles")->add_child_text (_burn_subtitles ? "1" : "0");
372 root->add_child("Signed")->add_child_text (_signed ? "1" : "0");
373 root->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
374 root->add_child("Key")->add_child_text (_key.hex ());
375 _playlist->as_xml (root->add_child ("Playlist"));
380 /** Write state to our `metadata' file */
382 Film::write_metadata () const
384 boost::filesystem::create_directories (directory ());
385 shared_ptr<xmlpp::Document> doc = metadata ();
386 doc->write_to_file_formatted (file("metadata.xml").string ());
390 /** Read state from our metadata file.
391 * @return Notes about things that the user should know about, or empty.
394 Film::read_metadata ()
396 if (boost::filesystem::exists (file ("metadata")) && !boost::filesystem::exists (file ("metadata.xml"))) {
397 throw StringError (_("This film was created with an older version of DCP-o-matic, and unfortunately it cannot be loaded into this version. You will need to create a new Film, re-add your content and set it up again. Sorry!"));
400 cxml::Document f ("Metadata");
401 f.read_file (file ("metadata.xml"));
403 _state_version = f.number_child<int> ("Version");
404 if (_state_version > current_state_version) {
405 throw StringError (_("This film was created with a newer version of DCP-o-matic, and it cannot be loaded into this version. Sorry!"));
408 _name = f.string_child ("Name");
409 if (_state_version >= 9) {
410 _use_isdcf_name = f.bool_child ("UseISDCFName");
411 _isdcf_metadata = ISDCFMetadata (f.node_child ("ISDCFMetadata"));
412 _isdcf_date = boost::gregorian::from_undelimited_string (f.string_child ("ISDCFDate"));
414 _use_isdcf_name = f.bool_child ("UseDCIName");
415 _isdcf_metadata = ISDCFMetadata (f.node_child ("DCIMetadata"));
416 _isdcf_date = boost::gregorian::from_undelimited_string (f.string_child ("DCIDate"));
420 optional<string> c = f.optional_string_child ("DCPContentType");
422 _dcp_content_type = DCPContentType::from_isdcf_name (c.get ());
427 optional<string> c = f.optional_string_child ("Container");
429 _container = Ratio::from_id (c.get ());
433 _resolution = string_to_resolution (f.string_child ("Resolution"));
434 _scaler = Scaler::from_id (f.string_child ("Scaler"));
435 _j2k_bandwidth = f.number_child<int> ("J2KBandwidth");
436 _video_frame_rate = f.number_child<int> ("VideoFrameRate");
437 _signed = f.optional_bool_child("Signed").get_value_or (true);
438 _encrypted = f.bool_child ("Encrypted");
439 _audio_channels = f.number_child<int> ("AudioChannels");
440 _sequence_video = f.bool_child ("SequenceVideo");
441 _three_d = f.bool_child ("ThreeD");
442 _interop = f.bool_child ("Interop");
443 if (_state_version >= 32) {
444 _burn_subtitles = f.bool_child ("BurnSubtitles");
446 _key = dcp::Key (f.string_child ("Key"));
449 /* This method is the only one that can return notes (so far) */
450 _playlist->set_from_xml (shared_from_this(), f.node_child ("Playlist"), _state_version, notes);
452 /* Write backtraces to this film's directory, until another film is loaded */
453 set_backtrace_file (file ("backtrace.txt"));
459 /** Given a directory name, return its full path within the Film's directory.
460 * The directory (and its parents) will be created if they do not exist.
462 boost::filesystem::path
463 Film::dir (boost::filesystem::path d) const
465 boost::filesystem::path p;
469 boost::filesystem::create_directories (p);
474 /** Given a file or directory name, return its full path within the Film's directory.
475 * Any required parent directories will be created.
477 boost::filesystem::path
478 Film::file (boost::filesystem::path f) const
480 boost::filesystem::path p;
484 boost::filesystem::create_directories (p.parent_path ());
489 /** @return a ISDCF-compliant name for a DCP of this film */
491 Film::isdcf_name (bool if_created_now) const
495 string raw_name = name ();
497 /* Split the raw name up into words */
498 vector<string> words;
499 split (words, raw_name, is_any_of (" "));
503 /* Add each word to fixed_name */
504 for (vector<string>::const_iterator i = words.begin(); i != words.end(); ++i) {
507 /* First letter is always capitalised */
508 w[0] = toupper (w[0]);
510 /* Count caps in w */
512 for (size_t i = 0; i < w.size(); ++i) {
513 if (isupper (w[i])) {
518 /* If w is all caps make the rest of it lower case, otherwise
521 if (caps == w.size ()) {
522 for (size_t i = 1; i < w.size(); ++i) {
523 w[i] = tolower (w[i]);
527 for (size_t i = 0; i < w.size(); ++i) {
532 if (fixed_name.length() > 14) {
533 fixed_name = fixed_name.substr (0, 14);
538 if (dcp_content_type()) {
539 d << "_" << dcp_content_type()->isdcf_name();
540 d << "-" << isdcf_metadata().content_version;
543 ISDCFMetadata const dm = isdcf_metadata ();
545 if (dm.temp_version) {
549 if (dm.pre_release) {
557 if (!dm.chain.empty ()) {
558 d << "-" << dm.chain;
565 if (dm.two_d_version_of_three_d) {
569 if (!dm.mastered_luminance.empty ()) {
570 d << "-" << dm.mastered_luminance;
573 if (video_frame_rate() != 24) {
574 d << "-" << video_frame_rate();
578 d << "_" << container()->isdcf_name();
581 /* XXX: this uses the first bit of content only */
583 /* The standard says we don't do this for trailers, for some strange reason */
584 if (dcp_content_type() && dcp_content_type()->libdcp_kind() != dcp::TRAILER) {
585 ContentList cl = content ();
586 Ratio const * content_ratio = 0;
587 for (ContentList::iterator i = cl.begin(); i != cl.end(); ++i) {
588 shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (*i);
590 /* Here's the first piece of video content */
591 if (vc->scale().ratio ()) {
592 content_ratio = vc->scale().ratio ();
594 content_ratio = Ratio::from_ratio (vc->video_size().ratio ());
600 if (content_ratio && content_ratio != container()) {
601 d << "-" << content_ratio->isdcf_name();
605 if (!dm.audio_language.empty ()) {
606 d << "_" << dm.audio_language;
607 if (!dm.subtitle_language.empty()) {
608 d << "-" << dm.subtitle_language;
614 if (!dm.territory.empty ()) {
615 d << "_" << dm.territory;
616 if (!dm.rating.empty ()) {
617 d << "-" << dm.rating;
621 switch (audio_channels ()) {
644 d << "_" << resolution_to_string (_resolution);
646 if (!dm.studio.empty ()) {
647 d << "_" << dm.studio;
650 if (if_created_now) {
651 d << "_" << boost::gregorian::to_iso_string (boost::gregorian::day_clock::local_day ());
653 d << "_" << boost::gregorian::to_iso_string (_isdcf_date);
656 if (!dm.facility.empty ()) {
657 d << "_" << dm.facility;
670 if (!dm.package_type.empty ()) {
671 d << "_" << dm.package_type;
677 /** @return name to give the DCP */
679 Film::dcp_name (bool if_created_now) const
681 if (use_isdcf_name()) {
682 return isdcf_name (if_created_now);
689 Film::set_directory (boost::filesystem::path d)
696 Film::set_name (string n)
699 signal_changed (NAME);
703 Film::set_use_isdcf_name (bool u)
706 signal_changed (USE_ISDCF_NAME);
710 Film::set_dcp_content_type (DCPContentType const * t)
712 _dcp_content_type = t;
713 signal_changed (DCP_CONTENT_TYPE);
717 Film::set_container (Ratio const * c)
720 signal_changed (CONTAINER);
724 Film::set_resolution (Resolution r)
727 signal_changed (RESOLUTION);
731 Film::set_scaler (Scaler const * s)
734 signal_changed (SCALER);
738 Film::set_j2k_bandwidth (int b)
741 signal_changed (J2K_BANDWIDTH);
745 Film::set_isdcf_metadata (ISDCFMetadata m)
748 signal_changed (ISDCF_METADATA);
752 Film::set_video_frame_rate (int f)
754 _video_frame_rate = f;
755 signal_changed (VIDEO_FRAME_RATE);
759 Film::set_audio_channels (int c)
762 signal_changed (AUDIO_CHANNELS);
766 Film::set_three_d (bool t)
769 signal_changed (THREE_D);
773 Film::set_interop (bool i)
776 signal_changed (INTEROP);
780 Film::set_burn_subtitles (bool b)
783 signal_changed (BURN_SUBTITLES);
787 Film::signal_changed (Property p)
793 set_video_frame_rate (_playlist->best_dcp_frame_rate ());
795 case Film::VIDEO_FRAME_RATE:
796 case Film::SEQUENCE_VIDEO:
797 _playlist->maybe_sequence_video ();
804 ui_signaller->emit (boost::bind (boost::ref (Changed), p));
809 Film::set_isdcf_date_today ()
811 _isdcf_date = boost::gregorian::day_clock::local_day ();
814 boost::filesystem::path
815 Film::info_path (int f, Eyes e) const
817 boost::filesystem::path p;
822 s << setfill('0') << f;
824 if (e == EYES_LEFT) {
826 } else if (e == EYES_RIGHT) {
834 /* info_dir() will already have added any initial bit of the path,
835 so don't call file() on this.
840 boost::filesystem::path
841 Film::j2c_path (int f, Eyes e, bool t) const
843 boost::filesystem::path p;
845 p /= video_identifier ();
849 s << setfill('0') << f;
851 if (e == EYES_LEFT) {
853 } else if (e == EYES_RIGHT) {
867 /** Find all the DCPs in our directory that can be dcp::DCP::read() and return details of their CPLs */
871 vector<CPLSummary> out;
873 boost::filesystem::path const dir = directory ();
874 for (boost::filesystem::directory_iterator i = boost::filesystem::directory_iterator(dir); i != boost::filesystem::directory_iterator(); ++i) {
876 boost::filesystem::is_directory (*i) &&
877 i->path().leaf() != "j2c" && i->path().leaf() != "video" && i->path().leaf() != "info" && i->path().leaf() != "analysis"
885 i->path().leaf().string(),
886 dcp.cpls().front()->id(),
887 dcp.cpls().front()->annotation_text(),
888 dcp.cpls().front()->file()
901 Film::make_player () const
903 return shared_ptr<Player> (new Player (shared_from_this (), _playlist));
907 Film::set_signed (bool s)
910 signal_changed (SIGNED);
914 Film::set_encrypted (bool e)
917 signal_changed (ENCRYPTED);
921 Film::playlist () const
927 Film::content () const
929 return _playlist->content ();
933 Film::examine_content (shared_ptr<Content> c)
935 shared_ptr<Job> j (new ExamineContentJob (shared_from_this(), c));
936 JobManager::instance()->add (j);
940 Film::examine_and_add_content (shared_ptr<Content> c)
942 if (dynamic_pointer_cast<FFmpegContent> (c)) {
943 run_ffprobe (c->path(0), file ("ffprobe.log"), _log);
946 shared_ptr<Job> j (new ExamineContentJob (shared_from_this(), c));
948 _job_connections.push_back (
949 j->Finished.connect (bind (&Film::maybe_add_content, this, boost::weak_ptr<Job> (j), boost::weak_ptr<Content> (c)))
952 JobManager::instance()->add (j);
956 Film::maybe_add_content (weak_ptr<Job> j, weak_ptr<Content> c)
958 shared_ptr<Job> job = j.lock ();
959 if (!job || !job->finished_ok ()) {
963 shared_ptr<Content> content = c.lock ();
965 add_content (content);
970 Film::add_content (shared_ptr<Content> c)
972 /* Add video content after any existing content */
973 if (dynamic_pointer_cast<VideoContent> (c)) {
974 c->set_position (_playlist->video_end ());
981 Film::remove_content (shared_ptr<Content> c)
983 _playlist->remove (c);
987 Film::move_content_earlier (shared_ptr<Content> c)
989 _playlist->move_earlier (c);
993 Film::move_content_later (shared_ptr<Content> c)
995 _playlist->move_later (c);
999 Film::length () const
1001 return _playlist->length ();
1005 Film::best_video_frame_rate () const
1007 return _playlist->best_dcp_frame_rate ();
1011 Film::active_frame_rate_change (DCPTime t) const
1013 return _playlist->active_frame_rate_change (t, video_frame_rate ());
1017 Film::playlist_content_changed (boost::weak_ptr<Content> c, int p)
1019 if (p == VideoContentProperty::VIDEO_FRAME_RATE) {
1020 set_video_frame_rate (_playlist->best_dcp_frame_rate ());
1024 ui_signaller->emit (boost::bind (boost::ref (ContentChanged), c, p));
1029 Film::playlist_changed ()
1031 signal_changed (CONTENT);
1035 Film::audio_frame_rate () const
1042 Film::set_sequence_video (bool s)
1044 _sequence_video = s;
1045 _playlist->set_sequence_video (s);
1046 signal_changed (SEQUENCE_VIDEO);
1049 /** @return Size of the largest possible image in whatever resolution we are using */
1051 Film::full_frame () const
1053 switch (_resolution) {
1055 return dcp::Size (2048, 1080);
1057 return dcp::Size (4096, 2160);
1060 DCPOMATIC_ASSERT (false);
1061 return dcp::Size ();
1064 /** @return Size of the frame */
1066 Film::frame_size () const
1068 return fit_ratio_within (container()->ratio(), full_frame (), 1);
1073 dcp::Certificate target,
1074 boost::filesystem::path cpl_file,
1075 dcp::LocalTime from,
1076 dcp::LocalTime until,
1077 dcp::Formulation formulation
1080 shared_ptr<const dcp::CPL> cpl (new dcp::CPL (cpl_file));
1081 shared_ptr<const dcp::Signer> signer = Config::instance()->signer();
1082 if (!signer->valid ()) {
1083 throw InvalidSignerError ();
1086 return dcp::DecryptedKDM (
1087 cpl, key(), from, until, "DCP-o-matic", cpl->content_title_text(), dcp::LocalTime().as_string()
1088 ).encrypt (signer, target, formulation);
1091 list<dcp::EncryptedKDM>
1093 list<shared_ptr<Screen> > screens,
1094 boost::filesystem::path dcp,
1095 dcp::LocalTime from,
1096 dcp::LocalTime until,
1097 dcp::Formulation formulation
1100 list<dcp::EncryptedKDM> kdms;
1102 for (list<shared_ptr<Screen> >::iterator i = screens.begin(); i != screens.end(); ++i) {
1103 if ((*i)->certificate) {
1104 kdms.push_back (make_kdm ((*i)->certificate.get(), dcp, from, until, formulation));
1111 /** @return The approximate disk space required to encode a DCP of this film with the
1112 * current settings, in bytes.
1115 Film::required_disk_space () const
1117 return uint64_t (j2k_bandwidth() / 8) * length().seconds();
1120 /** This method checks the disk that the Film is on and tries to decide whether or not
1121 * there will be enough space to make a DCP for it. If so, true is returned; if not,
1122 * false is returned and required and availabe are filled in with the amount of disk space
1123 * required and available respectively (in Gb).
1125 * Note: the decision made by this method isn't, of course, 100% reliable.
1128 Film::should_be_enough_disk_space (double& required, double& available) const
1130 boost::filesystem::space_info s = boost::filesystem::space (internal_video_mxf_dir ());
1131 required = double (required_disk_space ()) / 1073741824.0f;
1132 available = double (s.available) / 1073741824.0f;
1133 return (available - required) > 1;
1137 Film::subtitle_language () const
1139 set<string> languages;
1141 ContentList cl = content ();
1142 BOOST_FOREACH (shared_ptr<Content>& c, cl) {
1143 shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (c);
1145 languages.insert (sc->subtitle_language ());
1150 BOOST_FOREACH (string s, languages) {
1151 if (!all.empty ()) {