Centralizing and unifying the generator of object identifiers.

Stream.h

@@ -26,6 +26,10 @@ public:
      * Destructor.
      */
     ~Stream();
+    /**
+     * Get unique id
+     */
+    inline int id() const { return id_; }
     /**
      * Open a media using gstreamer pipeline keyword
      * */
@@ -108,8 +112,6 @@ public:
      * */
     void accept(Visitor& v);
 
-    int id() const;
-
 protected:
 
     // video player description