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

    36 	 *            the SSRC of the sender, presumably taken from RTPSession

    37 	 * @param subtype

    38 	 *            the subtype of packet, application specific

    39 	 * @param pktName

    40 	 *            byte[4] representing ASCII name of packet

    41 	 * @param pktData

    42 	 *            the byte[4x] data that represents the message itself

    43 	 */

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

    45 		// Fetch all the right stuff from the database

    46 		super.ssrc = ssrc;

    47 		super.packetType = 204;

    48 		super.itemCount = subtype;

    49 		this.pktName = pktName;

    50 		this.pktData = pktData;

    51 	}

    52 

    53 	/**

    54 	 * Constructor that parses a received Application RTCP packet

    55 	 * 

    56 	 * @param aRawPkt

    57 	 *            the raw packet containing the date

    58 	 * @param start

    59 	 *            where in the raw packet this packet starts

    60 	 */

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

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

    63 		super.rawPkt = aRawPkt;

    64 

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

    66 			if (RTPSession.rtpDebugLevel > 2) {

    67 				System.out

    68 						.println(" <-> RtcpPktAPP.parseHeaders() etc. problem");

    69 			}

    70 			super.problem = -204;

    71 		} else {

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

    73 			if (super.length > 1) {

    74 				pktName = new byte[4];

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

    76 			}

    77 			if (super.length > 2) {

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

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

    80 			}

    81 		}

    82 	}

    83 

    84 	/**

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

    86 	 * 

    87 	 * CompRtcpPkt will call this automatically

    88 	 */

    89 	protected void encode() {

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

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

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

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

    94 		System

    95 				.arraycopy(this.pktData, 0, super.rawPkt, 12,

    96 						this.pktData.length);

    97 		writeHeaders();

    98 		// System.out.println("ENCODE: " + super.length + " " + rawPkt.length +

    99 		// " " + pktData.length);

   100 	}

   101 }