Parse ELNG box in MP4 container

media/formats/mp4/box_definitions.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_
 #define MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 297 matching lines @@
 
   std::string language() const;
 
   uint64_t creation_time;
   uint64_t modification_time;
   uint32_t timescale;
   uint64_t duration;
   uint16_t language_code;
 };
 
+struct MEDIA_EXPORT ExtendedLanguageTag : Box {
+  DECLARE_BOX_METHODS(ExtendedLanguageTag);
+  std::string language_tag;
+};
+
 struct MEDIA_EXPORT MediaInformation : Box {
   DECLARE_BOX_METHODS(MediaInformation);
 
   SampleTable sample_table;
 };
 
 struct MEDIA_EXPORT Media : Box {
   DECLARE_BOX_METHODS(Media);
 
   MediaHeader header;
   HandlerReference handler;
+  ExtendedLanguageTag extended_language_tag;
   MediaInformation information;
 };
 
 struct MEDIA_EXPORT Track : Box {
   DECLARE_BOX_METHODS(Track);
 
   TrackHeader header;
   Media media;
   Edit edit;
 };
@@ skipping 129 matching lines @@
   std::vector<TrackFragment> tracks;
   std::vector<ProtectionSystemSpecificHeader> pssh;
 };
 
 #undef DECLARE_BOX
 
 }  // namespace mp4
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_