feat: parse ID3 payload for inband events (#4391)

* feat: parse ID3 payload for inband events

src/dash/DashAdapter.js

@@ -39,6 +39,8 @@ import DashManifestModel from './models/DashManifestModel.js';
 import PatchManifestModel from './models/PatchManifestModel.js';
 import Representation from './vo/Representation.js';
 import {bcp47Normalize} from 'bcp-47-normalize';
+import {getId3Frames} from '@svta/common-media-library/id3/getId3Frames.js';
+import Constants from '../streaming/constants/Constants.js';
 
 /**
  * @module DashAdapter
@@ -465,6 +467,7 @@ function DashAdapter() {
             event.calculatedPresentationTime = calculatedPresentationTime;
             event.messageData = messageData;
             event.presentationTimeDelta = presentationTimeDelta;
+            event.parsedMessageData = (schemeIdUri === Constants.ID3_SCHEME_ID_URI) ? getId3Frames(messageData) : null;
 
             return event;
         } catch (e) {

src/dash/vo/Event.js

@@ -41,6 +41,7 @@ class Event {
         this.messageData = '';
         this.eventStream = null;
         this.presentationTimeDelta = NaN; // Specific EMSG Box parameter
+        this.parsedMessageData = null; // Parsed value of the event message
     }
 }
 

src/streaming/constants/Constants.js

@@ -274,6 +274,13 @@ export default {
     },
     ABANDON_FRAGMENT_RULES: {
         ABANDON_REQUEST_RULE: 'AbandonRequestsRule'
-    }
+    },
+
+    /**
+     *  @constant {string} ID3_SCHEME_ID_URI specifies scheme ID URI for ID3 timed metadata
+     *  @memberof Constants#
+     *  @static
+     */
+    ID3_SCHEME_ID_URI: 'https://aomedia.org/emsg/ID3'
 }