Rename getter

src/core/session.ts

         // setup the viewport
         this._viewport = viewport;
         if(this._primarySource !== null)
-            this._viewport._init(() => this._primarySource!._data.size, mode);
+            this._viewport._init(() => this._primarySource!._internalMedia.size, mode);
         else
             this._viewport._init(() => Utils.resolution('sm', window.innerWidth / window.innerHeight), mode);
 
      */
     private _renderUserMedia(): void
     {
-        const media = this._primarySource?._data;
+        const media = this._primarySource?._internalMedia;
         const canvas = this._viewport._backgroundCanvas;
         const ctx = canvas.getContext('2d', { alpha: false });
 

src/sources/canvas-source.ts

      * Get media
      * @internal
      */
-    get _data(): SpeedyMedia
+    get _internalMedia(): SpeedyMedia
     {
         if(this._media == null)
             throw new IllegalOperationError(`The media of the source of data isn't loaded`);

src/sources/video-source.ts

      * Get media
      * @internal
      */
-    get _data(): SpeedyMedia
+    get _internalMedia(): SpeedyMedia
     {
         if(this._media == null)
             throw new IllegalOperationError(`The media of the source of data isn't loaded`);

src/trackers/image-tracker/image-tracker.ts

 
         // compute the screen size for image processing purposes
         // note: this may change over time...!
-        const media = this._source!._data;
+        const media = this._source!._internalMedia;
         const aspectRatio = media.width / media.height;
         const screenSize = Utils.resolution(this._resolution, aspectRatio);