add mgcp_conn_rtp_type_names[]

First use in upcoming Ib89a6779e1d68c6600f00699d4303f6c0ee07132

Change-Id: If3d8bc68a3b26d3aa0ba7eedeab67b820889ed54

include/osmocom/mgcp/mgcp_conn.h

@@ -49,6 +49,11 @@ enum mgcp_conn_rtp_type {
 	MGCP_RTP_OSMUX,
 	MGCP_RTP_IUUP,
 };
+extern const struct value_string mgcp_conn_rtp_type_names[];
+static inline const char *mgcp_conn_rtp_type_name(enum mgcp_conn_rtp_type val)
+{
+	return get_value_string(mgcp_conn_rtp_type_names, val);
+}
 
 /*! Connection type, specifies which member of the union "u" in mgcp_conn
  *  contains a useful connection description (currently only RTP) */

src/libosmo-mgcp/mgcp_conn.c

@@ -441,3 +441,10 @@ struct mgcp_conn *mgcp_conn_get_oldest(struct mgcp_endpoint *endp)
 
 	return llist_last_entry(&endp->conns, struct mgcp_conn, entry);
 }
+
+const struct value_string mgcp_conn_rtp_type_names[] = {
+	{ MGCP_RTP_DEFAULT, "rtp" },
+	{ MGCP_RTP_OSMUX, "osmux" },
+	{ MGCP_RTP_IUUP, "iuup" },
+	{}
+};