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  * This is a four-directional data structures used for the frame buffer, i.e.

    23  * buffer for pkts that need to be assimilated into complete frames.

    24  * 

    25  * All the actual work is done by PktBuffer.

    26  * 

    27  * @author Arne Kepp

    28  * 

    29  */

    30 public class PktBufNode {

    31 	/** The next node (RTP Timestamp), looking from the back -> next means older */

    32 	protected PktBufNode nextFrameQueueNode = null;

    33 	/**

    34 	 * The previous node (RTP Timestmap), looking from the back -> prev means

    35 	 * newer

    36 	 */

    37 	protected PktBufNode prevFrameQueueNode = null;

    38 	/**

    39 	 * The next node within the frame, i.e. higher sequence number, same RTP

    40 	 * timestamp

    41 	 */

    42 	protected PktBufNode nextFrameNode = null;

    43 	/** Number of packets with the same RTP timestamp */

    44 	protected int pktCount;

    45 	/** The RTP timeStamp associated with this node */

    46 	protected long timeStamp;

    47 	/** The sequence number associated with this node */

    48 	protected int seqNum;

    49 	/** The payload, a parsed RTP Packet */

    50 	protected RtpPkt pkt = null;

    51 

    52 	/**

    53 	 * Create a new packet buffer node based on a packet

    54 	 * 

    55 	 * @param aPkt

    56 	 *            the packet

    57 	 */

    58 	protected PktBufNode(RtpPkt aPkt) {

    59 		initPktBufNode(aPkt);

    60 	}

    61 	

    62 	public PktBufNode(){

    63 	}

    64 	

    65 	public void initPktBufNode(RtpPkt aPkt) {

    66 		pkt = aPkt;

    67 		timeStamp = aPkt.getTimeStamp();

    68 		seqNum = aPkt.getSeqNumber();

    69 		pktCount = 1;

    70 	}

    71 }