diff -r c9ff263c29ad -r e684f11070d5 src/jlibrtp/RTPAppIntf.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jlibrtp/RTPAppIntf.java	Sat Mar 14 22:15:41 2009 +0100
@@ -0,0 +1,74 @@
+/**
+ * Java RTP Library (jlibrtp)
+ * Copyright (C) 2006 Arne Kepp
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package jlibrtp;
+
+
+/**
+ * This is the callback interface for RTP packets.
+ * 
+ * It is mandatory, but you can inore the data if you like.
+ * 
+ * @author Arne Kepp
+ */
+public interface RTPAppIntf {
+	
+	/**
+	 * The callback method through which the application will receive
+	 * data from jlibrtp. These calls are synchronous, so you will not
+	 * receive any new packets until this call returns.
+	 * 
+	 * @param frame the frame containing the data
+	 * @param participant the participant from which the data came
+	 */
+	public void receiveData(DataFrame frame, Participant participant);
+	
+	
+	/**
+	 * The callback method through which the application will receive
+	 * notifications about user updates, additions and byes.
+	 *  Types:
+	 *  	1 - Bye
+	 *  	2 - New through RTP, check .getRtpSendSock()
+	 *  	3 - New through RTCP, check .getRtcpSendSock()
+	 * 		4 - SDES packet received, check the getCname() etc methods
+	 *      5 - Matched SSRC to ip-address provided by application
+	 * 
+	 * @param type the type of event
+	 * @param participant the participants in question
+	 */
+	public void userEvent(int type, Participant[] participant);
+	
+	/**
+	 * The callback method through which the application can specify
+	 * the number of packets that make up a frame for a given payload type.
+	 * 
+	 * A negative value denotes frames of variable length, so jlibrtp
+	 * will return whatever it has at the time.
+	 * 
+	 * In most applications, this function can simply return 1.
+	 * 
+	 * This should be implemented as something fast, such as an
+	 * integer array with the indeces being the payload type.
+	 * 
+	 * @param payloadType the payload type specified in the RTP packet
+	 * @return the number of packets that make up a frame
+	 */
+	public int frameSize(int payloadType);
+}