Add support for writing CPL metadata about sign language video tracks (DoM #2062).

1 files changed, 21 insertions, 0 deletions

diff --git a/src/cpl.cc b/src/cpl.cc
index e52f8b34..1f20d13e 100644
--- a/src/cpl.cc
+++ b/src/cpl.cc
@@ -312,6 +312,23 @@ CPL::read_composition_metadata_asset (cxml::ConstNodePtr node)
 			_additional_subtitle_languages.push_back (sll_split[i]);
 		}
 	}
+
+	auto eml = node->optional_node_child ("ExtensionMetadataList");
+	if (eml) {
+		for (auto i: eml->node_children("ExtensionMetadata")) {
+			auto name = i->optional_string_child("Name");
+			if (name && *name == "Sign Language Video") {
+				auto property_list = i->node_child("PropertyList");
+				for (auto j: property_list->node_children("Property")) {
+					auto name = j->optional_string_child("Name");
+					auto value = j->optional_string_child("Value");
+					if (name && value && *name == "Language Tag") {
+						_sign_language_video_language = *value;
+					}
+				}
+			}
+		}
+	}
 }
 
 
@@ -433,6 +450,10 @@ CPL::maybe_write_composition_metadata_asset (xmlpp::Element* node) const
 	/* SMPTE Bv2.1 8.6.3 */
 	add_extension_metadata ("http://isdcf.com/ns/cplmd/app", "Application", "DCP Constraints Profile", "SMPTE-RDD-52:2020-Bv2.1");
 
+	if (_sign_language_video_language) {
+		add_extension_metadata ("http://isdcf.com/2017/10/SignLanguageVideo", "Sign Language Video", "Language Tag", *_sign_language_video_language);
+	}
+
 	if (_reels.front()->main_sound()) {
 		auto asset = _reels.front()->main_sound()->asset();
 		if (asset) {