BMediaRoster: Add B_MEDIA_SERVER_STARTED and B_MEDIA_SERVER_QUIT

* This is done by watching to registrar notifications
  and providing a minimal service to contact the
  media roster in private API. The roster use this
  service to automatically reconnect to the media_server.

headers/os/media/MediaDefs.h

@@ -47,8 +47,10 @@ enum {
 	B_MEDIA_NEW_PARAMETER_VALUE,	/* N "node", "parameter", "when", */
 									/* "value" */
 	B_MEDIA_NODE_STOPPED,			/* N "node", "when" */
-	B_MEDIA_FLAVORS_CHANGED			/* "be:addon_id", "be:new_count", */
+	B_MEDIA_FLAVORS_CHANGED,		/* "be:addon_id", "be:new_count", */
 									/* "be:gone_count" */
+	B_MEDIA_SERVER_STARTED,
+	B_MEDIA_SERVER_QUIT
 };
 
 

headers/private/media/DataExchange.h

@@ -16,7 +16,11 @@ namespace media {
 namespace dataexchange {
 
 
-void InitDataExchange();
+void InitServerDataExchange();
+void InitRosterDataExchange(const BMessenger& rosterMessenger);
+
+// BMessage based data exchange with the current BMediaRoster
+status_t SendToRoster(BMessage* msg);
 
 // BMessage based data exchange with the media_server
 status_t SendToServer(BMessage* msg);

headers/private/media/MediaRosterEx.h

@@ -88,6 +88,8 @@ public:
 
 		BTimeSource*		MakeTimeSourceObject(media_node_id timesource_id);
 
+		status_t			BuildConnections();
+
 private:
 	friend class BMediaRoster;
 };

headers/private/media/ServerInterface.h

@@ -32,6 +32,12 @@ enum {
 	MEDIA_ADD_ON_SERVER_PLAY_MEDIA = '_TRU'
 };
 
+enum {
+	// local media services status notification service
+	MEDIA_ROSTER_REQUEST_NOTIFICATIONS = 2000,
+	MEDIA_ROSTER_CANCEL_NOTIFICATIONS
+};
+
 // Raw port based communication
 enum {
 	GENERAL_PURPOSE_WAKEUP = 0,	// when no action but wait termination needed