Initial video code and RTP library.
This commit is contained in:
Cameron Gutman
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/**
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* Java RTP Library (jlibrtp)
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* Copyright (C) 2006 Arne Kepp
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package jlibrtp;
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import java.net.DatagramPacket;
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import java.net.InetSocketAddress;
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import java.util.*;
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/**
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* This thread sends scheduled RTCP packets
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*
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* It also performs maintenance of various queues and the participant
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* database.
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*
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* @author Arne Kepp
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*
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*/
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public class RTCPSenderThread extends Thread {
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/** Parent RTP Session */
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private RTPSession rtpSession = null;
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/** Parent RTCP Session */
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private RTCPSession rtcpSession = null;
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/** Whether we have sent byes for the last conflict */
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private boolean byesSent = false;
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/**
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* Constructor for new thread
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* @param rtcpSession parent RTCP session
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* @param rtpSession parent RTP session
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*/
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protected RTCPSenderThread(RTCPSession rtcpSession, RTPSession rtpSession) {
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this.rtpSession = rtpSession;
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this.rtcpSession = rtcpSession;
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if(RTPSession.rtpDebugLevel > 1) {
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System.out.println("<-> RTCPSenderThread created");
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}
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}
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/**
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* Send BYE messages to all the relevant participants
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*
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*/
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protected void sendByes() {
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// Create the packet
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CompRtcpPkt compPkt = new CompRtcpPkt();
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//Need a SR for validation
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RtcpPktSR srPkt = new RtcpPktSR(this.rtpSession.ssrc,
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this.rtpSession.sentPktCount, this.rtpSession.sentOctetCount, null);
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compPkt.addPacket(srPkt);
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byte[] reasonBytes;
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//Add the actualy BYE Pkt
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long[] ssrcArray = {this.rtpSession.ssrc};
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if(rtpSession.conflict) {
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reasonBytes = "SSRC collision".getBytes();
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} else {
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reasonBytes = "jlibrtp says bye bye!".getBytes();
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}
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RtcpPktBYE byePkt = new RtcpPktBYE( ssrcArray, reasonBytes);
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compPkt.addPacket(byePkt);
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// Send it off
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if(rtpSession.mcSession) {
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mcSendCompRtcpPkt(compPkt);
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} else {
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Iterator<Participant> iter = rtpSession.partDb.getUnicastReceivers();
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while(iter.hasNext()) {
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Participant part = (Participant) iter.next();
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if(part.rtcpAddress != null)
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sendCompRtcpPkt(compPkt, part.rtcpAddress);
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}
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//System.out.println("SENT BYE PACKETS!!!!!");
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}
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}
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/**
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* Multicast version of sending a Compound RTCP packet
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*
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* @param pkt the packet to best
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* @return 0 is successful, -1 otherwise
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*/
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protected int mcSendCompRtcpPkt(CompRtcpPkt pkt) {
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byte[] pktBytes = pkt.encode();
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DatagramPacket packet;
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// Create datagram
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try {
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packet = new DatagramPacket(pktBytes,pktBytes.length,rtpSession.mcGroup,rtcpSession.rtcpMCSock.getPort());
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} catch (Exception e) {
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System.out.println("RCTPSenderThread.MCSendCompRtcpPkt() packet creation failed.");
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e.printStackTrace();
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return -1;
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}
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// Send packet
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if(RTPSession.rtcpDebugLevel > 5) {
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System.out.println("<-> RTCPSenderThread.SendCompRtcpPkt() multicast");
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}
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try {
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rtcpSession.rtcpMCSock.send(packet);
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//Debug
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if(this.rtpSession.debugAppIntf != null) {
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this.rtpSession.debugAppIntf.packetSent(3, (InetSocketAddress) packet.getSocketAddress(),
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new String("Sent multicast RTCP packet of size " + packet.getLength() +
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" to " + packet.getSocketAddress().toString() + " via "
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+ this.rtcpSession.rtcpMCSock.getLocalSocketAddress().toString()));
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}
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} catch (Exception e) {
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System.out.println("RCTPSenderThread.MCSendCompRtcpPkt() multicast failed.");
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e.printStackTrace();
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return -1;
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}
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return packet.getLength();
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}
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/**
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* Unicast version of sending a Compound RTCP packet
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*
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* @param pkt the packet to best
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* @param receiver the socket address of the recipient
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* @return 0 is successful, -1 otherwise
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*/
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protected int sendCompRtcpPkt(CompRtcpPkt pkt, InetSocketAddress receiver) {
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byte[] pktBytes = pkt.encode();
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DatagramPacket packet;
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//Create datagram
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try {
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//System.out.println("receiver: " + receiver);
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packet = new DatagramPacket(pktBytes,pktBytes.length,receiver);
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} catch (Exception e) {
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System.out.println("RCTPSenderThread.SendCompRtcpPkt() packet creation failed.");
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e.printStackTrace();
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return -1;
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}
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//Send packet
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if(RTPSession.rtcpDebugLevel > 5) {
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Iterator<RtcpPkt> iter = pkt.rtcpPkts.iterator();
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String str = " ";
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while(iter.hasNext()) {
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RtcpPkt aPkt = iter.next();
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str += (aPkt.getClass().toString() + ":"+aPkt.itemCount+ ", ");
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}
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System.out.println("<-> RTCPSenderThread.SendCompRtcpPkt() unicast to " + receiver + str);
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}
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try {
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rtcpSession.rtcpSock.send(packet);
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//Debug
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if(this.rtpSession.debugAppIntf != null) {
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this.rtpSession.debugAppIntf.packetSent(2, (InetSocketAddress) packet.getSocketAddress(),
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new String("Sent unicast RTCP packet of size " + packet.getLength() +
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" to " + packet.getSocketAddress().toString() + " via "
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+ this.rtcpSession.rtcpSock.getLocalSocketAddress().toString()));
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}
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} catch (Exception e) {
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System.out.println("RTCPSenderThread.SendCompRtcpPkt() unicast failed.");
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e.printStackTrace();
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return -1;
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}
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return packet.getLength();
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}
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/**
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* Check whether we can send an immediate feedback packet to this person
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* @param ssrc SSRC of participant
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*/
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protected void reconsiderTiming(long ssrc) {
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Participant part = this.rtpSession.partDb.getParticipant(ssrc);
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if( part != null && this.rtcpSession.fbSendImmediately()) {
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CompRtcpPkt compPkt = preparePacket(part, false);
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/*********** Send the packet ***********/
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// Keep track of sent packet length for average;
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int datagramLength;
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if(rtpSession.mcSession) {
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datagramLength = this.mcSendCompRtcpPkt(compPkt);
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} else {
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//part.debugPrint();
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datagramLength = this.sendCompRtcpPkt(compPkt, part.rtcpAddress);
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}
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/*********** Administrative tasks ***********/
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//Update average packet size
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if(datagramLength > 0) {
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rtcpSession.updateAvgPacket(datagramLength);
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}
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} else if(part != null
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&& this.rtcpSession.fbAllowEarly
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&& this.rtcpSession.fbSendEarly()) {
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// Make sure we dont do it too often
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this.rtcpSession.fbAllowEarly = false;
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CompRtcpPkt compPkt = preparePacket(part, true);
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/*********** Send the packet ***********/
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// Keep track of sent packet length for average;
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int datagramLength;
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if(rtpSession.mcSession) {
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datagramLength = this.mcSendCompRtcpPkt(compPkt);
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} else {
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//part.debugPrint();
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datagramLength = this.sendCompRtcpPkt(compPkt, part.rtcpAddress);
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}
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/*********** Administrative tasks ***********/
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//Update average packet size
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if(datagramLength > 0) {
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rtcpSession.updateAvgPacket(datagramLength);
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}
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rtcpSession.calculateDelay();
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}
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//Out of luck, fb message will have to go with next regular packet
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//Sleep for the remaining time.
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this.rtcpSession.nextDelay -= System.currentTimeMillis() - this.rtcpSession.prevTime;
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if(this.rtcpSession.nextDelay < 0)
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this.rtcpSession.nextDelay = 0;
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}
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/**
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* Prepare a packet. The output depends on the participant and how the
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* packet is scheduled.
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*
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* @param part the participant to report to
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* @param regular whether this is a regularly, or early scheduled RTCP packet
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* @return compound RTCP packet
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*/
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protected CompRtcpPkt preparePacket(Participant part, boolean regular) {
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/*********** Figure out what we are going to send ***********/
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// Check whether this person has sent RTP packets since the last RR.
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boolean incRR = false;
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if(part.secondLastRtcpRRPkt > part.lastRtcpRRPkt) {
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incRR = true;
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part.secondLastRtcpRRPkt = part.lastRtcpRRPkt;
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part.lastRtcpRRPkt = System.currentTimeMillis();
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}
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// Are we sending packets? -> add SR
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boolean incSR = false;
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if(rtpSession.sentPktCount > 0 && regular) {
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incSR = true;
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}
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/*********** Actually create the packet ***********/
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// Create compound packet
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CompRtcpPkt compPkt = new CompRtcpPkt();
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//If we're sending packets we'll use a SR for header
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if(incSR) {
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RtcpPktSR srPkt = new RtcpPktSR(this.rtpSession.ssrc,
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this.rtpSession.sentPktCount, this.rtpSession.sentOctetCount, null);
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compPkt.addPacket(srPkt);
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if(part.ssrc > 0) {
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RtcpPkt[] ar = this.rtcpSession.getFromFbQueue(part.ssrc);
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if(ar != null) {
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for(int i=0; i<ar.length; i++) {
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compPkt.addPacket(ar[i]);
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}
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}
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}
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}
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//If we got anything from this participant since we sent the 2nd to last RtcpPkt
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if(incRR || !incSR) {
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Participant[] partArray = {part};
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if(part.receivedPkts < 1)
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partArray = null;
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RtcpPktRR rrPkt = new RtcpPktRR(partArray, rtpSession.ssrc);
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compPkt.addPacket(rrPkt);
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if( !incSR && part.ssrc > 0) {
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RtcpPkt[] ar = this.rtcpSession.getFromFbQueue(part.ssrc);
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if(ar != null) {
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for(int i=0; i<ar.length; i++) {
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compPkt.addPacket(ar[i]);
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}
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}
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}
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}
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// APP packets
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if(regular && part.ssrc > 0) {
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RtcpPkt[] ar = this.rtcpSession.getFromAppQueue(part.ssrc);
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if(ar != null) {
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for(int i=0; i<ar.length; i++) {
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compPkt.addPacket(ar[i]);
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}
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} else {
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//Nope
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}
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}
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// For now we'll stick the SDES on every time, and only for us
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//if(regular) {
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RtcpPktSDES sdesPkt = new RtcpPktSDES(true, this.rtpSession, null);
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compPkt.addPacket(sdesPkt);
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//}
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return compPkt;
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}
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/**
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* Start the RTCP sender thread.
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*
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* RFC 4585 is more complicated, but in general it will
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* 1) Wait a precalculated amount of time
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* 2) Determine the next RTCP recipient
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* 3) Construct a compound packet with all the relevant information
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* 4) Send the packet
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* 5) Calculate next delay before going to sleep
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*/
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public void run() {
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if(RTPSession.rtcpDebugLevel > 1) {
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System.out.println("<-> RTCPSenderThread running");
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}
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// Give the application a chance to register some participants
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try { Thread.sleep(10); }
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catch (Exception e) { System.out.println("RTCPSenderThread didn't get any initial rest."); }
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// Set up an iterator for the member list
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Enumeration<Participant> enu = null;
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Iterator<Participant> iter = null;
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// TODO Change to rtcpReceivers
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if(rtpSession.mcSession) {
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enu = rtpSession.partDb.getParticipants();
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} else {
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iter = rtpSession.partDb.getUnicastReceivers();
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}
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while(! rtpSession.endSession) {
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if(RTPSession.rtcpDebugLevel > 5) {
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System.out.println("<-> RTCPSenderThread sleeping for " +rtcpSession.nextDelay+" ms");
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}
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try { Thread.sleep(rtcpSession.nextDelay); }
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catch (Exception e) {
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System.out.println("RTCPSenderThread Exception message:" + e.getMessage());
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// Is the party over?
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if(this.rtpSession.endSession) {
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continue;
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}
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if(rtcpSession.fbWaiting != -1) {
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reconsiderTiming(rtcpSession.fbWaiting);
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continue;
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}
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}
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/** Came here the regular way */
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this.rtcpSession.fbAllowEarly = true;
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if(RTPSession.rtcpDebugLevel > 5) {
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System.out.println("<-> RTCPSenderThread waking up");
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}
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// Regenerate nextDelay, before anything happens.
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rtcpSession.calculateDelay();
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// We'll wait here until a conflict (if any) has been resolved,
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// so that the bye packets for our current SSRC can be sent.
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if(rtpSession.conflict) {
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if(! this.byesSent) {
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sendByes();
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this.byesSent = true;
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}
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continue;
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}
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this.byesSent = false;
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//Grab the next person
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Participant part = null;
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//Multicast
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if(this.rtpSession.mcSession) {
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if(! enu.hasMoreElements())
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enu = rtpSession.partDb.getParticipants();
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if( enu.hasMoreElements() ) {
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part = enu.nextElement();
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} else {
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continue;
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}
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//Unicast
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} else {
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if(! iter.hasNext()) {
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iter = rtpSession.partDb.getUnicastReceivers();
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}
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if(iter.hasNext() ) {
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while( iter.hasNext() && (part == null || part.rtcpAddress == null)) {
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part = iter.next();
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}
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}
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if(part == null || part.rtcpAddress == null)
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continue;
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}
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CompRtcpPkt compPkt = preparePacket(part, true);
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/*********** Send the packet ***********/
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// Keep track of sent packet length for average;
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int datagramLength;
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if(rtpSession.mcSession) {
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datagramLength = this.mcSendCompRtcpPkt(compPkt);
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} else {
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//part.debugPrint();
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datagramLength = this.sendCompRtcpPkt(compPkt, part.rtcpAddress);
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}
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/*********** Administrative tasks ***********/
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//Update average packet size
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if(datagramLength > 0) {
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rtcpSession.updateAvgPacket(datagramLength);
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}
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}
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// Be polite, say Bye to everone
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sendByes();
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try { Thread.sleep(200);} catch(Exception e) {}
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if(RTPSession.rtcpDebugLevel > 0) {
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System.out.println("<-> RTCPSenderThread terminating");
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}
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}
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}
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