feat(FEC-9631): add support for out of band text tracks on cast sdk (#…

…319)

Update the local player on cast disconnection with the captions from the cast snapshot 

Solves FEC-9631

Related to kaltura/playkit-js-cast-sender#32

src/common/cast/remote-control.js

@@ -143,6 +143,9 @@ function onRemoteDeviceDisconnected(payload: RemoteDisconnectedPayload): void {
       const mediaConfig = snapshot.mediaConfig;
       snapshot.config.playback.autoplay = true;
       configurePlayback.call(this, snapshot.config.playback);
+      this._eventManager.listenOnce(this, this.Event.Core.CHANGE_SOURCE_ENDED, () => {
+        configureTracks.call(this, snapshot.config.sources);
+      });
       let mediaPromise;
       if (mediaInfo) {
         mediaPromise = this.loadMedia(mediaInfo);
@@ -239,6 +242,17 @@ function configurePlayback(playbackConfig: Object): void {
   });
 }
 
+function configureTracks(sourcesConfig: Object): void {
+  if (sourcesConfig.captions.length) {
+    const {captions} = sourcesConfig;
+    this.configure({
+      sources: {
+        captions
+      }
+    });
+  }
+}
+
 function setInitialTracks(playbackConfig: Object): void {
   if (playbackConfig.audioLanguage) {
     const audioTrack = this.getTracks(TrackType.AUDIO).find(t => t.language === playbackConfig.audioLanguage);