Make DCP text track language properly optional and ignore bad values on imported DCPs (#1950).

5 files changed, 39 insertions, 19 deletions

diff --git a/src/lib/dcp_examiner.cc b/src/lib/dcp_examiner.cc
index a0bc487d9..ad2220fc0 100644
--- a/src/lib/dcp_examiner.cc
+++ b/src/lib/dcp_examiner.cc
@@ -193,7 +193,7 @@ DCPExaminer::DCPExaminer (shared_ptr<const DCPContent> content, bool tolerant)
 			}
 
 			_text_count[static_cast<int>(TextType::CLOSED_CAPTION)]++;
-			_dcp_text_tracks.push_back (DCPTextTrack(j->annotation_text(), j->language().get_value_or(_("Unknown"))));
+			_dcp_text_tracks.push_back (DCPTextTrack(j->annotation_text(), try_to_parse_language(j->language())));
 		}
 
 		if (i->main_markers ()) {
diff --git a/src/lib/dcp_text_track.cc b/src/lib/dcp_text_track.cc
index 1c73870aa..0bd751275 100644
--- a/src/lib/dcp_text_track.cc
+++ b/src/lib/dcp_text_track.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2018 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2018-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,50 +18,65 @@
 
 */
 
+
 #include "dcp_text_track.h"
 #include "compose.hpp"
 #include <string>
 
+#include "i18n.h"
+
+
 using std::string;
+using boost::optional;
+
 
 DCPTextTrack::DCPTextTrack (cxml::ConstNodePtr node)
 {
 	name = node->string_child("Name");
-	language = node->string_child("Language");
+	if (auto lang = node->optional_string_child("Language")) {
+		language = dcp::LanguageTag(*lang);
+	}
 }
 
-DCPTextTrack::DCPTextTrack (string name_, string language_)
+
+DCPTextTrack::DCPTextTrack (string name_, optional<dcp::LanguageTag> language_)
 	: name (name_)
 	, language (language_)
 {
 
 }
 
+
 string
 DCPTextTrack::summary () const
 {
-	return String::compose("%1 (%2)", name, language);
+	return String::compose("%1 (%2)", name, language ? language->to_string() : _("Unknown"));
 }
 
 void
 DCPTextTrack::as_xml (xmlpp::Element* parent) const
 {
 	parent->add_child("Name")->add_child_text(name);
-	parent->add_child("Language")->add_child_text(language);
+	if (language) {
+		parent->add_child("Language")->add_child_text(language->to_string());
+	}
 }
 
+
 bool
 operator== (DCPTextTrack const & a, DCPTextTrack const & b)
 {
 	return a.name == b.name && a.language == b.language;
 }
 
+
 bool
 operator!= (DCPTextTrack const & a, DCPTextTrack const & b)
 {
 	return !(a == b);
 }
 
+
 bool
 operator< (DCPTextTrack const & a, DCPTextTrack const & b)
 {
diff --git a/src/lib/dcp_text_track.h b/src/lib/dcp_text_track.h
index e6a146b3b..b29d8c489 100644
--- a/src/lib/dcp_text_track.h
+++ b/src/lib/dcp_text_track.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2018 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2018-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,24 +18,28 @@
 
 */
 
+
 #ifndef DCPOMATIC_DCP_TEXT_TRACK_H
 #define DCPOMATIC_DCP_TEXT_TRACK_H
 
+
 #include "warnings.h"
+#include <dcp/language_tag.h>
 #include <libcxml/cxml.h>
 DCPOMATIC_DISABLE_WARNINGS
 #include <libxml++/libxml++.h>
 DCPOMATIC_ENABLE_WARNINGS
 
+
 class DCPTextTrack
 {
 public:
 	DCPTextTrack () {}
 	DCPTextTrack (cxml::ConstNodePtr node);
-	DCPTextTrack (std::string name_, std::string language_);
+	DCPTextTrack (std::string name_, boost::optional<dcp::LanguageTag> language_);
 
 	std::string name;
-	std::string language;
+	boost::optional<dcp::LanguageTag> language;
 
 	std::string summary () const;
 	void as_xml (xmlpp::Element* parent) const;
@@ -45,4 +49,5 @@ bool operator== (DCPTextTrack const & a, DCPTextTrack const & b);
 bool operator!= (DCPTextTrack const & a, DCPTextTrack const & b);
 bool operator< (DCPTextTrack const & a, DCPTextTrack const & b);
 
+
 #endif
diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index 3eb43161e..2d88d7162 100644
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -653,8 +653,8 @@ ReelWriter::create_reel_text (
 			);
 		DCPOMATIC_ASSERT (a);
 		a->set_annotation_text (i.first.name);
-		if (!i.first.language.empty()) {
-			a->set_language (dcp::LanguageTag(i.first.language));
+		if (i.first.language) {
+			a->set_language (i.first.language.get());
 		}
 
 		ensure_closed_captions.erase (i.first);
@@ -667,8 +667,8 @@ ReelWriter::create_reel_text (
 			);
 		DCPOMATIC_ASSERT (a);
 		a->set_annotation_text (i.name);
-		if (!i.language.empty()) {
-			a->set_language (dcp::LanguageTag(i.language));
+		if (i.language) {
+			a->set_language (i.language.get());
 		}
 	}
 }
@@ -782,8 +782,8 @@ ReelWriter::empty_text_asset (TextType type, optional<DCPTextTrack> track) const
 		s->set_movie_title (film()->name());
 		if (type == TextType::OPEN_SUBTITLE) {
 			s->set_language (lang.first ? lang.first->to_string() : "Unknown");
-		} else if (!track->language.empty()) {
-			s->set_language (track->language);
+		} else if (track->language) {
+			s->set_language (track->language->to_string());
 		}
 		s->set_reel_number (raw_convert<string> (_reel_index + 1));
 		asset = s;
@@ -793,8 +793,8 @@ ReelWriter::empty_text_asset (TextType type, optional<DCPTextTrack> track) const
 		s->set_metadata (mxf_metadata());
 		if (type == TextType::OPEN_SUBTITLE && lang.first) {
 			s->set_language (*lang.first);
-		} else if (track && !track->language.empty()) {
-			s->set_language (dcp::LanguageTag(track->language));
+		} else if (track && track->language) {
+			s->set_language (dcp::LanguageTag(track->language->to_string()));
 		}
 		s->set_edit_rate (dcp::Fraction (film()->video_frame_rate(), 1));
 		s->set_reel_number (_reel_index + 1);
diff --git a/src/lib/subtitle_encoder.cc b/src/lib/subtitle_encoder.cc
index b61876ad6..66957270f 100644
--- a/src/lib/subtitle_encoder.cc
+++ b/src/lib/subtitle_encoder.cc
@@ -149,8 +149,8 @@ SubtitleEncoder::text (PlayerText subs, TextType type, optional<DCPTextTrack> tr
 			s->set_content_title_text (_film->name());
 			if (lang.first) {
 				s->set_language (*lang.first);
-			} else if (!track->language.empty()) {
-				s->set_language (dcp::LanguageTag(track->language));
+			} else if (track->language) {
+				s->set_language (track->language.get());
 			}
 			s->set_edit_rate (dcp::Fraction (_film->video_frame_rate(), 1));
 			s->set_reel_number (_reel_index + 1);