fix(SUP-38407): [GaTech] [Multistream - V7 Player] Child entries not …

…loading high quality flavor assets (#793)

Add function to change quality on child entries in dual screen.

part of - kaltura/playkit-js-dual-screen#155

solves SUP-38407

src/player.ts

@@ -1280,6 +1280,22 @@ export default class Player extends FakeEventTarget {
     });
   }
 
+  /**
+   * change quality in child entries
+   * @function changeChildQuality
+   * @param {?Track} track - the track to change
+   * @returns {void}
+   * @public
+   */
+  public changeChildQuality(track: any | string): void{
+    if (track === 'auto') {
+      this.enableAdaptiveBitrate();
+    } else {
+      this.selectTrack(track);
+    }
+    this._markActiveTrack(track);
+  }
+
   /**
    * Select a track
    * @function selectTrack