/*
- Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
*/
-#include <stdexcept>
-#include <iostream>
-#include <algorithm>
-#include <fstream>
-#include <cstdlib>
-#include <sstream>
-#include <iomanip>
-#include <unistd.h>
-#include <boost/filesystem.hpp>
-#include <boost/algorithm/string.hpp>
-#include <boost/date_time.hpp>
-#include <libxml++/libxml++.h>
-#include <libcxml/cxml.h>
-#include <libdcp/signer_chain.h>
-#include <libdcp/cpl.h>
-#include <libdcp/signer.h>
-#include <libdcp/util.h>
-#include <libdcp/kdm.h>
-#include <libdcp/raw_convert.h>
+/** @file src/film.cc
+ * @brief A representation of some audio and video content, and details of
+ * how they should be presented in a DCP.
+ */
+
#include "film.h"
#include "job.h"
#include "util.h"
#include "log.h"
#include "exceptions.h"
#include "examine_content_job.h"
-#include "scaler.h"
#include "config.h"
-#include "version.h"
-#include "ui_signaller.h"
#include "playlist.h"
#include "player.h"
#include "dcp_content_type.h"
#include "ratio.h"
#include "cross.h"
#include "cinema.h"
+#include "safe_stringstream.h"
+#include "environment_info.h"
+#include "raw_convert.h"
+#include <libcxml/cxml.h>
+#include <dcp/cpl.h>
+#include <dcp/signer.h>
+#include <dcp/util.h>
+#include <dcp/local_time.h>
+#include <dcp/decrypted_kdm.h>
+#include <libxml++/libxml++.h>
+#include <boost/filesystem.hpp>
+#include <boost/algorithm/string.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/foreach.hpp>
+#include <unistd.h>
+#include <stdexcept>
+#include <iostream>
+#include <algorithm>
+#include <fstream>
+#include <cstdlib>
+#include <iomanip>
+#include <set>
#include "i18n.h"
using std::string;
-using std::stringstream;
using std::multimap;
using std::pair;
using std::map;
using std::endl;
using std::cout;
using std::list;
+using std::set;
using boost::shared_ptr;
using boost::weak_ptr;
using boost::dynamic_pointer_cast;
using boost::starts_with;
using boost::optional;
using boost::is_any_of;
-using libdcp::Size;
-using libdcp::Signer;
-using libdcp::raw_convert;
+using dcp::Size;
+using dcp::Signer;
#define LOG_GENERAL(...) log()->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
#define LOG_GENERAL_NC(...) log()->log (__VA_ARGS__, Log::TYPE_GENERAL);
* Use <Scale> tag in <VideoContent> rather than <Ratio>.
* 8 -> 9
* DCI -> ISDCF
+ * 9 -> 10
+ * Subtitle X and Y scale.
+ *
+ * Bumped to 32 for 2.0 branch; some times are expressed in Times rather
+ * than frames now.
*/
-int const Film::current_state_version = 9;
+int const Film::current_state_version = 32;
/** Construct a Film object in a given directory.
*
, _dcp_content_type (Config::instance()->default_dcp_content_type ())
, _container (Config::instance()->default_container ())
, _resolution (RESOLUTION_2K)
- , _scaler (Scaler::from_id ("bicubic"))
- , _with_subtitles (false)
, _signed (true)
, _encrypted (false)
, _j2k_bandwidth (Config::instance()->default_j2k_bandwidth ())
, _three_d (false)
, _sequence_video (true)
, _interop (false)
+ , _burn_subtitles (false)
, _state_version (current_state_version)
, _dirty (false)
{
set_isdcf_date_today ();
- _playlist->Changed.connect (bind (&Film::playlist_changed, this));
- _playlist->ContentChanged.connect (bind (&Film::playlist_content_changed, this, _1, _2));
+ _playlist_changed_connection = _playlist->Changed.connect (bind (&Film::playlist_changed, this));
+ _playlist_content_changed_connection = _playlist->ContentChanged.connect (bind (&Film::playlist_content_changed, this, _1, _2));
/* Make state.directory a complete path without ..s (where possible)
(Code swiped from Adam Bowen on stackoverflow)
}
}
- set_directory (result);
+ set_directory (result.make_preferred ());
if (log) {
_log.reset (new FileLog (file ("log")));
} else {
_playlist->set_sequence_video (_sequence_video);
}
+Film::~Film ()
+{
+ for (list<boost::signals2::connection>::const_iterator i = _job_connections.begin(); i != _job_connections.end(); ++i) {
+ i->disconnect ();
+ }
+}
+
string
Film::video_identifier () const
{
- assert (container ());
+ DCPOMATIC_ASSERT (container ());
- stringstream s;
+ SafeStringStream s;
s.imbue (std::locale::classic ());
s << container()->id()
<< "_" << resolution_to_string (_resolution)
<< "_" << _playlist->video_identifier()
<< "_" << _video_frame_rate
- << "_" << scaler()->id()
<< "_" << j2k_bandwidth();
if (encrypted ()) {
s << "_S";
}
- if (_three_d) {
- s << "_3D";
+ if (_burn_subtitles) {
+ s << "_B";
}
- if (_with_subtitles) {
- s << "_WS";
+ if (_three_d) {
+ s << "_3D";
}
return s.str ();
}
-/** @return The path to the directory to write video frame info files to */
+/** @return The file to write video frame info to */
boost::filesystem::path
-Film::info_dir () const
+Film::info_file () const
{
boost::filesystem::path p;
p /= "info";
p /= video_identifier ();
- return dir (p);
+ return file (p);
}
boost::filesystem::path
return video_identifier() + ".mxf";
}
-boost::filesystem::path
-Film::video_mxf_filename () const
-{
- return filename_safe_name() + "_video.mxf";
-}
-
-boost::filesystem::path
-Film::audio_mxf_filename () const
-{
- return filename_safe_name() + "_audio.mxf";
-}
-
string
Film::filename_safe_name () const
{
throw BadSettingError (_("name"), _("cannot contain slashes"));
}
- /* It seems to make sense to auto-save metadata here, since the make DCP may last
- a long time, and crashes/power failures are moderately likely.
- */
- write_metadata ();
-
- LOG_GENERAL ("DCP-o-matic %1 git %2 using %3", dcpomatic_version, dcpomatic_git_commit, dependency_version_summary());
-
- {
- char buffer[128];
- gethostname (buffer, sizeof (buffer));
- LOG_GENERAL ("Starting to make DCP on %1", buffer);
- }
+ environment_info (log ());
ContentList cl = content ();
for (ContentList::const_iterator i = cl.begin(); i != cl.end(); ++i) {
LOG_GENERAL ("DCP video rate %1 fps", video_frame_rate());
LOG_GENERAL ("%1 threads", Config::instance()->num_local_encoding_threads());
LOG_GENERAL ("J2K bandwidth %1", j2k_bandwidth());
-#ifdef DCPOMATIC_DEBUG
- LOG_GENERAL_NC ("DCP-o-matic built in debug mode.");
-#else
- LOG_GENERAL_NC ("DCP-o-matic built in optimised mode.");
-#endif
-#ifdef LIBDCP_DEBUG
- LOG_GENERAL_NC ("libdcp built in debug mode.");
-#else
- LOG_GENERAL_NC ("libdcp built in optimised mode.");
-#endif
-
-#ifdef DCPOMATIC_WINDOWS
- OSVERSIONINFO info;
- info.dwOSVersionInfoSize = sizeof (info);
- GetVersionEx (&info);
- LOG_GENERAL ("Windows version %1.%2.%3 SP %4", info.dwMajorVersion, info.dwMinorVersion, info.dwBuildNumber, info.szCSDVersion);
-#endif
-
- LOG_GENERAL ("CPU: %1, %2 processors", cpu_info(), boost::thread::hardware_concurrency ());
- list<pair<string, string> > const m = mount_info ();
- for (list<pair<string, string> >::const_iterator i = m.begin(); i != m.end(); ++i) {
- LOG_GENERAL ("Mount: %1 %2", i->first, i->second);
- }
if (container() == 0) {
throw MissingSettingError (_("container"));
JobManager::instance()->add (j);
}
-/** Count the number of frames that have been encoded for this film.
- * @return frame count.
- */
-int
-Film::encoded_frames () const
-{
- if (container() == 0) {
- return 0;
- }
-
- int N = 0;
- for (boost::filesystem::directory_iterator i = boost::filesystem::directory_iterator (info_dir ()); i != boost::filesystem::directory_iterator(); ++i) {
- ++N;
- boost::this_thread::interruption_point ();
- }
-
- return N;
-}
-
shared_ptr<xmlpp::Document>
Film::metadata () const
{
}
root->add_child("Resolution")->add_child_text (resolution_to_string (_resolution));
- root->add_child("Scaler")->add_child_text (_scaler->id ());
- root->add_child("WithSubtitles")->add_child_text (_with_subtitles ? "1" : "0");
root->add_child("J2KBandwidth")->add_child_text (raw_convert<string> (_j2k_bandwidth));
_isdcf_metadata.as_xml (root->add_child ("ISDCFMetadata"));
root->add_child("VideoFrameRate")->add_child_text (raw_convert<string> (_video_frame_rate));
root->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
root->add_child("SequenceVideo")->add_child_text (_sequence_video ? "1" : "0");
root->add_child("Interop")->add_child_text (_interop ? "1" : "0");
+ root->add_child("BurnSubtitles")->add_child_text (_burn_subtitles ? "1" : "0");
root->add_child("Signed")->add_child_text (_signed ? "1" : "0");
root->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
root->add_child("Key")->add_child_text (_key.hex ());
}
_resolution = string_to_resolution (f.string_child ("Resolution"));
- _scaler = Scaler::from_id (f.string_child ("Scaler"));
- _with_subtitles = f.bool_child ("WithSubtitles");
_j2k_bandwidth = f.number_child<int> ("J2KBandwidth");
_video_frame_rate = f.number_child<int> ("VideoFrameRate");
_signed = f.optional_bool_child("Signed").get_value_or (true);
_encrypted = f.bool_child ("Encrypted");
_audio_channels = f.number_child<int> ("AudioChannels");
+ /* We used to allow odd numbers (and zero) channels, but it's just not worth
+ the pain.
+ */
+ if (_audio_channels == 0) {
+ _audio_channels = 2;
+ } else if ((_audio_channels % 2) == 1) {
+ _audio_channels++;
+ }
_sequence_video = f.bool_child ("SequenceVideo");
_three_d = f.bool_child ("ThreeD");
_interop = f.bool_child ("Interop");
- _key = libdcp::Key (f.string_child ("Key"));
+ if (_state_version >= 32) {
+ _burn_subtitles = f.bool_child ("BurnSubtitles");
+ }
+ _key = dcp::Key (f.string_child ("Key"));
list<string> notes;
/* This method is the only one that can return notes (so far) */
_playlist->set_from_xml (shared_from_this(), f.node_child ("Playlist"), _state_version, notes);
+ /* Write backtraces to this film's directory, until another film is loaded */
+ set_backtrace_file (file ("backtrace.txt"));
+
_dirty = false;
return notes;
}
string
Film::isdcf_name (bool if_created_now) const
{
- stringstream d;
+ SafeStringStream d;
string raw_name = name ();
d << "_" << container()->isdcf_name();
}
- /* XXX: this only works for content which has been scaled to a given ratio,
- and uses the first bit of content only.
- */
+ ContentList cl = content ();
+
+ /* XXX: this uses the first bit of content only */
/* The standard says we don't do this for trailers, for some strange reason */
- if (dcp_content_type() && dcp_content_type()->libdcp_kind() != libdcp::TRAILER) {
- ContentList cl = content ();
+ if (dcp_content_type() && dcp_content_type()->libdcp_kind() != dcp::TRAILER) {
Ratio const * content_ratio = 0;
- for (ContentList::const_iterator i = cl.begin(); i != cl.end(); ++i) {
+ for (ContentList::iterator i = cl.begin(); i != cl.end(); ++i) {
shared_ptr<VideoContent> vc = dynamic_pointer_cast<VideoContent> (*i);
- if (vc && (content_ratio == 0 || vc->scale().ratio() != content_ratio)) {
- content_ratio = vc->scale().ratio();
+ if (vc) {
+ /* Here's the first piece of video content */
+ if (vc->scale().ratio ()) {
+ content_ratio = vc->scale().ratio ();
+ } else {
+ content_ratio = Ratio::from_ratio (vc->video_size().ratio ());
+ }
+ break;
}
}
}
}
- switch (audio_channels ()) {
- case 1:
- d << "_10";
- break;
- case 2:
- d << "_20";
- break;
- case 3:
- d << "_30";
- break;
- case 4:
- d << "_40";
- break;
- case 5:
- d << "_50";
- break;
- case 6:
- d << "_51";
- break;
+ /* Find all mapped channels */
+
+ list<dcp::Channel> mapped;
+ for (ContentList::const_iterator i = cl.begin(); i != cl.end(); ++i) {
+ shared_ptr<const AudioContent> ac = dynamic_pointer_cast<const AudioContent> (*i);
+ if (ac) {
+ list<dcp::Channel> c = ac->audio_mapping().mapped_dcp_channels ();
+ copy (c.begin(), c.end(), back_inserter (mapped));
+ }
+ }
+
+ mapped.sort ();
+ mapped.unique ();
+
+ /* Count them */
+
+ int non_lfe = 0;
+ int lfe = 0;
+ for (list<dcp::Channel>::const_iterator i = mapped.begin(); i != mapped.end(); ++i) {
+ if (static_cast<int> (*i) >= audio_channels()) {
+ /* This channel is mapped but is not included in the DCP */
+ continue;
+ }
+
+ if ((*i) == dcp::LFE) {
+ ++lfe;
+ } else {
+ ++non_lfe;
+ }
+ }
+
+ if (non_lfe) {
+ d << "_" << non_lfe << lfe;
}
/* XXX: HI/VI */
string
Film::dcp_name (bool if_created_now) const
{
+ string unfiltered;
if (use_isdcf_name()) {
- return isdcf_name (if_created_now);
+ unfiltered = isdcf_name (if_created_now);
+ } else {
+ unfiltered = name ();
}
- return name();
-}
+ /* Filter out `bad' characters which cause problems with some systems.
+ There's no apparent list of what really is allowed, so this is a guess.
+ */
+ string filtered;
+ string const allowed = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_";
+ for (size_t i = 0; i < unfiltered.size(); ++i) {
+ if (allowed.find (unfiltered[i]) != string::npos) {
+ filtered += unfiltered[i];
+ }
+ }
+
+ return filtered;
+}
void
Film::set_directory (boost::filesystem::path d)
signal_changed (RESOLUTION);
}
-void
-Film::set_scaler (Scaler const * s)
-{
- _scaler = s;
- signal_changed (SCALER);
-}
-
-void
-Film::set_with_subtitles (bool w)
-{
- _with_subtitles = w;
- signal_changed (WITH_SUBTITLES);
-}
-
void
Film::set_j2k_bandwidth (int b)
{
signal_changed (INTEROP);
}
+void
+Film::set_burn_subtitles (bool b)
+{
+ _burn_subtitles = b;
+ signal_changed (BURN_SUBTITLES);
+}
+
void
Film::signal_changed (Property p)
{
break;
}
- if (ui_signaller) {
- ui_signaller->emit (boost::bind (boost::ref (Changed), p));
- }
+ emit (boost::bind (boost::ref (Changed), p));
}
void
_isdcf_date = boost::gregorian::day_clock::local_day ();
}
-boost::filesystem::path
-Film::info_path (int f, Eyes e) const
-{
- boost::filesystem::path p;
- p /= info_dir ();
-
- stringstream s;
- s.width (8);
- s << setfill('0') << f;
-
- if (e == EYES_LEFT) {
- s << ".L";
- } else if (e == EYES_RIGHT) {
- s << ".R";
- }
-
- s << ".md5";
-
- p /= s.str();
-
- /* info_dir() will already have added any initial bit of the path,
- so don't call file() on this.
- */
- return p;
-}
-
boost::filesystem::path
Film::j2c_path (int f, Eyes e, bool t) const
{
p /= "j2c";
p /= video_identifier ();
- stringstream s;
+ SafeStringStream s;
s.width (8);
s << setfill('0') << f;
return file (p);
}
-/** Find all the DCPs in our directory that can be libdcp::DCP::read() and return details of their CPLs */
+/** Find all the DCPs in our directory that can be dcp::DCP::read() and return details of their CPLs */
vector<CPLSummary>
Film::cpls () const
{
) {
try {
- libdcp::DCP dcp (*i);
+ dcp::DCP dcp (*i);
dcp.read ();
out.push_back (
CPLSummary (
- i->path().leaf().string(), dcp.cpls().front()->id(), dcp.cpls().front()->name(), dcp.cpls().front()->filename()
+ i->path().leaf().string(),
+ dcp.cpls().front()->id(),
+ dcp.cpls().front()->annotation_text(),
+ dcp.cpls().front()->file()
)
);
} catch (...) {
signal_changed (ENCRYPTED);
}
+void
+Film::set_key (dcp::Key key)
+{
+ _key = key;
+ signal_changed (KEY);
+}
+
shared_ptr<Playlist>
Film::playlist () const
{
return _playlist->content ();
}
+void
+Film::examine_content (shared_ptr<Content> c)
+{
+ shared_ptr<Job> j (new ExamineContentJob (shared_from_this(), c));
+ JobManager::instance()->add (j);
+}
+
void
Film::examine_and_add_content (shared_ptr<Content> c)
{
}
shared_ptr<Job> j (new ExamineContentJob (shared_from_this(), c));
- j->Finished.connect (bind (&Film::maybe_add_content, this, boost::weak_ptr<Job> (j), boost::weak_ptr<Content> (c)));
+
+ _job_connections.push_back (
+ j->Finished.connect (bind (&Film::maybe_add_content, this, boost::weak_ptr<Job> (j), boost::weak_ptr<Content> (c)))
+ );
+
JobManager::instance()->add (j);
}
_playlist->move_later (c);
}
-Time
+DCPTime
Film::length () const
{
return _playlist->length ();
}
-bool
-Film::has_subtitles () const
+int
+Film::best_video_frame_rate () const
{
- return _playlist->has_subtitles ();
+ return _playlist->best_dcp_frame_rate ();
}
-OutputVideoFrame
-Film::best_video_frame_rate () const
+FrameRateChange
+Film::active_frame_rate_change (DCPTime t) const
{
- return _playlist->best_dcp_frame_rate ();
+ return _playlist->active_frame_rate_change (t, video_frame_rate ());
}
void
{
if (p == VideoContentProperty::VIDEO_FRAME_RATE) {
set_video_frame_rate (_playlist->best_dcp_frame_rate ());
- }
-
- if (ui_signaller) {
- ui_signaller->emit (boost::bind (boost::ref (ContentChanged), c, p));
+ } else if (
+ p == AudioContentProperty::AUDIO_MAPPING ||
+ p == AudioContentProperty::AUDIO_CHANNELS) {
+ signal_changed (NAME);
}
+
+ emit (boost::bind (boost::ref (ContentChanged), c, p));
}
void
Film::playlist_changed ()
{
signal_changed (CONTENT);
+ signal_changed (NAME);
}
-OutputAudioFrame
-Film::time_to_audio_frames (Time t) const
-{
- return divide_with_round (t * audio_frame_rate (), TIME_HZ);
-}
-
-OutputVideoFrame
-Film::time_to_video_frames (Time t) const
-{
- return divide_with_round (t * video_frame_rate (), TIME_HZ);
-}
-
-Time
-Film::audio_frames_to_time (OutputAudioFrame f) const
-{
- return divide_with_round (f * TIME_HZ, audio_frame_rate ());
-}
-
-Time
-Film::video_frames_to_time (OutputVideoFrame f) const
-{
- return divide_with_round (f * TIME_HZ, video_frame_rate ());
-}
-
-OutputAudioFrame
+int
Film::audio_frame_rate () const
{
/* XXX */
}
/** @return Size of the largest possible image in whatever resolution we are using */
-libdcp::Size
+dcp::Size
Film::full_frame () const
{
switch (_resolution) {
case RESOLUTION_2K:
- return libdcp::Size (2048, 1080);
+ return dcp::Size (2048, 1080);
case RESOLUTION_4K:
- return libdcp::Size (4096, 2160);
+ return dcp::Size (4096, 2160);
}
- assert (false);
- return libdcp::Size ();
+ DCPOMATIC_ASSERT (false);
+ return dcp::Size ();
}
/** @return Size of the frame */
-libdcp::Size
+dcp::Size
Film::frame_size () const
{
return fit_ratio_within (container()->ratio(), full_frame ());
}
-/** @param from KDM from time in local time.
- * @param to KDM to time in local time.
- */
-libdcp::KDM
+dcp::EncryptedKDM
Film::make_kdm (
- shared_ptr<libdcp::Certificate> target,
+ dcp::Certificate target,
boost::filesystem::path cpl_file,
- boost::posix_time::ptime from,
- boost::posix_time::ptime until,
- libdcp::KDM::Formulation formulation
+ dcp::LocalTime from,
+ dcp::LocalTime until,
+ dcp::Formulation formulation
) const
{
- shared_ptr<const Signer> signer = make_signer ();
-
- time_t now = time (0);
- struct tm* tm = localtime (&now);
- string const issue_date = libdcp::tm_to_string (tm);
+ shared_ptr<const dcp::CPL> cpl (new dcp::CPL (cpl_file));
+ shared_ptr<const dcp::Signer> signer = Config::instance()->signer();
+ if (!signer->valid ()) {
+ throw InvalidSignerError ();
+ }
- return libdcp::KDM (cpl_file, signer, target, key (), from, until, "DCP-o-matic", issue_date, formulation);
+ return dcp::DecryptedKDM (
+ cpl, key(), from, until, "DCP-o-matic", cpl->content_title_text(), dcp::LocalTime().as_string()
+ ).encrypt (signer, target, formulation);
}
-list<libdcp::KDM>
+list<dcp::EncryptedKDM>
Film::make_kdms (
list<shared_ptr<Screen> > screens,
boost::filesystem::path dcp,
- boost::posix_time::ptime from,
- boost::posix_time::ptime until,
- libdcp::KDM::Formulation formulation
+ dcp::LocalTime from,
+ dcp::LocalTime until,
+ dcp::Formulation formulation
) const
{
- list<libdcp::KDM> kdms;
+ list<dcp::EncryptedKDM> kdms;
for (list<shared_ptr<Screen> >::iterator i = screens.begin(); i != screens.end(); ++i) {
- kdms.push_back (make_kdm ((*i)->certificate, dcp, from, until, formulation));
+ if ((*i)->certificate) {
+ kdms.push_back (make_kdm ((*i)->certificate.get(), dcp, from, until, formulation));
+ }
}
return kdms;
uint64_t
Film::required_disk_space () const
{
- return uint64_t (j2k_bandwidth() / 8) * length() / TIME_HZ;
+ return uint64_t (j2k_bandwidth() / 8) * length().seconds();
}
/** This method checks the disk that the Film is on and tries to decide whether or not
* Note: the decision made by this method isn't, of course, 100% reliable.
*/
bool
-Film::should_be_enough_disk_space (double& required, double& available) const
-{
+Film::should_be_enough_disk_space (double& required, double& available, bool& can_hard_link) const
+{
+ /* Create a test file and see if we can hard-link it */
+ boost::filesystem::path test = internal_video_mxf_dir() / "test";
+ boost::filesystem::path test2 = internal_video_mxf_dir() / "test2";
+ can_hard_link = true;
+ FILE* f = fopen_boost (test, "w");
+ if (f) {
+ fclose (f);
+ boost::system::error_code ec;
+ boost::filesystem::create_hard_link (test, test2, ec);
+ if (ec) {
+ can_hard_link = false;
+ }
+ boost::filesystem::remove (test);
+ boost::filesystem::remove (test2);
+ }
+
boost::filesystem::space_info s = boost::filesystem::space (internal_video_mxf_dir ());
required = double (required_disk_space ()) / 1073741824.0f;
+ if (!can_hard_link) {
+ required *= 2;
+ }
available = double (s.available) / 1073741824.0f;
return (available - required) > 1;
}
-FrameRateChange
-Film::active_frame_rate_change (Time t) const
+string
+Film::subtitle_language () const
{
- return _playlist->active_frame_rate_change (t, video_frame_rate ());
-}
+ set<string> languages;
+
+ ContentList cl = content ();
+ BOOST_FOREACH (shared_ptr<Content>& c, cl) {
+ shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (c);
+ if (sc) {
+ languages.insert (sc->subtitle_language ());
+ }
+ }
+ string all;
+ BOOST_FOREACH (string s, languages) {
+ if (!all.empty ()) {
+ all += "/" + s;
+ } else {
+ all += s;
+ }
+ }
+
+ return all;
+}