1 /**

     2  * Java RTP Library (jlibrtp)

     3  * Copyright (C) 2006 Arne Kepp

     4  * 

     5  * This library is free software; you can redistribute it and/or

     6  * modify it under the terms of the GNU Lesser General Public

     7  * License as published by the Free Software Foundation; either

     8  * version 2.1 of the License, or (at your option) any later version.

     9  *

    10  * This library is distributed in the hope that it will be useful,

    11  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13  * Lesser General Public License for more details.

    14  * 

    15  * You should have received a copy of the GNU Lesser General Public

    16  * License along with this library; if not, write to the Free Software

    17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    18  */

    19 package jlibrtp;

    20 

    21 /**

    22  * Application specific RTCP packets

    23  * 

    24  * @author Arne Kepp

    25  */

    26 public class RtcpPktAPP extends RtcpPkt {

    27 	/** Name of packet, 4 bytes ASCII */

    28 	protected byte[] pktName = null;

    29 	/** Data of packet */

    30 	protected byte[] pktData = null;	

    31 	

    32 	/**

    33 	 * Constructor for a new Application RTCP packet

    34 	 * 

    35 	 * @param ssrc the SSRC of the sender, presumably taken from RTPSession

    36 	 * @param subtype the subtype of packet, application specific

    37 	 * @param pktName byte[4] representing ASCII name of packet

    38 	 * @param pktData the byte[4x] data that represents the message itself

    39 	 */

    40 	protected RtcpPktAPP(long ssrc, int subtype, byte[] pktName, byte[] pktData) {

    41 		// Fetch all the right stuff from the database

    42 		super.ssrc = ssrc;

    43 		super.packetType = 204;

    44 		super.itemCount = subtype;

    45 		this.pktName = pktName;

    46 		this.pktData = pktData;

    47 	}

    48 	

    49 	/**

    50 	 * Constructor that parses a received Application RTCP packet

    51 	 * 

    52 	 * @param aRawPkt the raw packet containing the date

    53 	 * @param start where in the raw packet this packet starts

    54 	 */

    55 	protected RtcpPktAPP(byte[] aRawPkt, int start) {

    56 		super.ssrc = StaticProcs.bytesToUIntLong(aRawPkt,4);

    57 		super.rawPkt = aRawPkt;

    58 		

    59 		if(!super.parseHeaders(start) || packetType != 204 ) {

    60 			if(RTPSession.rtpDebugLevel > 2) {

    61 				System.out.println(" <-> RtcpPktAPP.parseHeaders() etc. problem");

    62 			}

    63 			super.problem = -204;

    64 		} else {

    65 			//System.out.println("super.length:  " + super.length);

    66 			if(super.length > 1) {

    67 				pktName = new byte[4];

    68 				System.arraycopy(aRawPkt, 8, pktName, 0, 4);

    69 			}

    70 			if(super.length > 2) {

    71 				pktData = new byte[(super.length+1)*4 - 12];

    72 				System.arraycopy(aRawPkt, 12, pktData, 0, pktData.length);

    73 			}

    74 		}

    75 	}

    76 	

    77 	/**

    78 	 * Encode the packet into a byte[], saved in .rawPkt

    79 	 * 

    80 	 * CompRtcpPkt will call this automatically

    81 	 */

    82 	protected void encode() {	

    83 		super.rawPkt = new byte[12 + this.pktData.length];

    84 		byte[] tmp = StaticProcs.uIntLongToByteWord(super.ssrc);

    85 		System.arraycopy(tmp, 0, super.rawPkt, 4, 4);

    86 		System.arraycopy(this.pktName, 0, super.rawPkt, 8, 4);

    87 		System.arraycopy(this.pktData, 0, super.rawPkt, 12, this.pktData.length);

    88 		writeHeaders();

    89 		//System.out.println("ENCODE: " + super.length + " " + rawPkt.length + " " + pktData.length);

    90 	}

    91 }