Add the ability to dynamicaly register MediaPlayer types.

Add the ability to dynamically register low level MediaPlayer
factories which will be probed at setDataSource time to determine the
proper MediaPlayerBase to instantiate.

This change is in preparation for moving libaah_rtp out of
frameworks/base and into phantasm platform directory.

Change-Id: Icf8904db3ab9e3c85df6e780d5546d9988cb9076
Signed-off-by: John Grossman <johngro@google.com>
diff --git a/include/media/IMediaPlayer.h b/include/media/IMediaPlayer.h
index 00facc5..4ed1863 100644
--- a/include/media/IMediaPlayer.h
+++ b/include/media/IMediaPlayer.h
@@ -64,6 +64,7 @@
     virtual status_t        setParameter(int key, const Parcel& request) = 0;
     virtual status_t        getParameter(int key, Parcel* reply) = 0;
     virtual status_t        setRetransmitEndpoint(const struct sockaddr_in* endpoint) = 0;
+    virtual status_t        getRetransmitEndpoint(struct sockaddr_in* endpoint) = 0;
     virtual status_t        setNextPlayer(const sp<IMediaPlayer>& next) = 0;
 
     // Invoke a generic method on the player by using opaque parcels