feat: add missing DASH roles from ISO/IEC 23009-1 section 5.8.5.5 (#1390)

Fixes #1149

---------

Co-authored-by: Joey Parrish <joeyparrish@users.noreply.github.com>

docs/source/options/dash_stream_descriptors.rst

@@ -10,7 +10,10 @@ DASH specific stream descriptor fields
 
 :dash_roles (roles):
 
-    Optional semicolon separated list of values for DASH Role element. The
+    optional semicolon separated list of values for DASH Role element. The
     value should be one of: **caption**, **subtitle**, **main**, **alternate**,
-    **supplementary**, **commentary**, **description**, **dub** and **forced-subtitle** .
+    **supplementary**, **commentary**, **dub**, **description**, **sign**,
+    **metadata**, **enhanced-audio- intelligibility**, **emergency**,
+    **forced-subtitle**, **easyreader**, and **karaoke**.
+
     See DASH (ISO/IEC 23009-1) specification for details.

packager/app/packager_main.cc

@@ -126,9 +126,10 @@ const char kUsage[] =
     "    list of values for DASH Accessibility elements. The value should be\n"
     "    in the format: scheme_id_uri=value.\n"
     "  - dash_roles (roles): Optional semicolon separated list of values for\n"
-    "    DASH Role elements. The value should be one of: caption, subtitle,\n"
-    "    forced-subtitle, main, alternate, supplementary, commentary, \n"
-    "    description and dub. See DASH\n"
+    "    DASH Role elements. The value should be one of: caption, subtitle, \n"
+    "    main, alternate, supplementary, commentary, dub, description, sign, \n"
+    "    metadata, enhanced-audio- intelligibility, emergency, \n"
+    "    forced-subtitle, easyreader, and karaoke. See DASH\n"
     "    (ISO/IEC 23009-1) specification for details.\n"
     "  - forced_subtitle: Optional boolean value (0|1). If set to 1 \n"
     "    indicates that this stream is a Forced Narrative subtitle that \n"

packager/mpd/base/adaptation_set.cc

@@ -59,10 +59,22 @@ std::string RoleToText(AdaptationSet::Role role) {
       return "commentary";
     case AdaptationSet::kRoleDub:
       return "dub";
-    case AdaptationSet::kRoleForcedSubtitle:
-      return "forced-subtitle";
     case AdaptationSet::kRoleDescription:
       return "description";
+    case AdaptationSet::kRoleSign:
+      return "sign";
+    case AdaptationSet::kRoleMetadata:
+      return "metadata";
+    case AdaptationSet::kRoleEnhancedAudioIntelligibility:
+      return "enhanced-audio-intelligibility";
+    case AdaptationSet::kRoleEmergency:
+      return "emergency";
+    case AdaptationSet::kRoleForcedSubtitle:
+      return "forced-subtitle";
+    case AdaptationSet::kRoleEasyreader:
+      return "easyreader";
+    case AdaptationSet::kRoleKaraoke:
+      return "karaoke";
     default:
       return "unknown";
   }

packager/mpd/base/adaptation_set.h

@@ -43,8 +43,14 @@ class AdaptationSet {
     kRoleSupplementary,
     kRoleCommentary,
     kRoleDub,
+    kRoleDescription,
+    kRoleSign,
+    kRoleMetadata,
+    kRoleEnhancedAudioIntelligibility,
+    kRoleEmergency,
     kRoleForcedSubtitle,
-    kRoleDescription
+    kRoleEasyreader,
+    kRoleKaraoke,
   };
 
   virtual ~AdaptationSet();