Rygel
        
        Description:
        Content:
        Interfaces:
        
          - MediaPlayer - This interface maps UPnP 
              AVTransport:2 methods to the plugin's specific implementation.
- PlayerController - This class keeps track of
              global states that are not dependant on the RygelMediaPlayer.
Classes:
        
          - MediaRendererPlugin - This is the base class 
              for every Rygel UPnP renderer plugin.
- MediaRenderer - This class may be used to implement
              in-process UPnP-AV media renderers.