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1 /** |
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2 * Java RTP Library (jlibrtp) |
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3 * Copyright (C) 2006 Arne Kepp |
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4 * |
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5 * This library is free software; you can redistribute it and/or |
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6 * modify it under the terms of the GNU Lesser General Public |
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7 * License as published by the Free Software Foundation; either |
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8 * version 2.1 of the License, or (at your option) any later version. |
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9 * |
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10 * This library is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 * Lesser General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Lesser General Public |
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16 * License along with this library; if not, write to the Free Software |
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17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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18 */ |
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19 package jlibrtp; |
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20 |
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21 import java.io.IOException; |
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22 import java.net.DatagramPacket; |
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23 import java.net.InetSocketAddress; |
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24 |
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25 /** |
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26 * The RTP receiver thread waits on the designated UDP socket for new packets. |
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27 * |
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28 * Once one arrives, it is parsed and tested. We also check the ip-address of the sender. |
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29 * If accepted, the packet is added onto the packet buffer of the participant. |
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30 * |
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31 * A separate thread moves the packet from the packet buffer to the application. |
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32 * |
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33 * @author Arne Kepp |
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34 */ |
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35 public class RTPReceiverThread extends Thread { |
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36 /** Parent RTP Session */ |
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37 RTPSession rtpSession = null; |
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38 |
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39 RTPReceiverThread(RTPSession session) { |
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40 rtpSession = session; |
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41 if(RTPSession.rtpDebugLevel > 1) { |
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42 System.out.println("<-> RTPReceiverThread created"); |
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43 } |
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44 } |
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45 |
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46 public void run() { |
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47 if(RTPSession.rtpDebugLevel > 1) { |
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48 if(rtpSession.mcSession) { |
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49 System.out.println("-> RTPReceiverThread.run() starting on MC " + rtpSession.rtpMCSock.getLocalPort() ); |
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50 } else { |
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51 System.out.println("-> RTPReceiverThread.run() starting on " + rtpSession.rtpSock.getLocalPort() ); |
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52 } |
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53 } |
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54 |
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55 while(!rtpSession.endSession) { |
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56 if(RTPSession.rtpDebugLevel > 6) { |
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57 if(rtpSession.mcSession) { |
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58 System.out.println("-> RTPReceiverThread.run() waiting for MC packet on " + rtpSession.rtpMCSock.getLocalPort() ); |
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59 } else { |
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60 System.out.println("-> RTPReceiverThread.run() waiting for packet on " + rtpSession.rtpSock.getLocalPort() ); |
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61 } |
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62 } |
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63 |
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64 // Prepare a packet |
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65 byte[] rawPkt = new byte[1500]; |
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66 DatagramPacket packet = new DatagramPacket(rawPkt, rawPkt.length); |
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67 // Wait for it to arrive |
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68 if(! rtpSession.mcSession) { |
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69 //Unicast |
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70 try { |
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71 rtpSession.rtpSock.receive(packet); |
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72 } catch (IOException e) { |
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73 if(!rtpSession.endSession) { |
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74 e.printStackTrace(); |
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75 } else { |
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76 continue; |
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77 } |
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78 } |
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79 } else { |
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80 //Multicast |
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81 try { |
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82 rtpSession.rtpMCSock.receive(packet); |
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83 } catch (IOException e) { |
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84 if(!rtpSession.endSession) { |
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85 e.printStackTrace(); |
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86 } else { |
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87 continue; |
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88 } |
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89 } |
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90 } |
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91 |
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92 // Parse the received RTP (?) packet |
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93 RtpPkt pkt = new RtpPkt(rawPkt, packet.getLength()); |
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94 |
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95 // Check whether it was valid. |
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96 if(pkt == null) { |
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97 System.out.println("Received invalid RTP packet. Ignoring"); |
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98 continue; |
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99 } |
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100 |
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101 long pktSsrc = pkt.getSsrc(); |
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102 |
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103 // Check for loops and SSRC collisions |
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104 if( rtpSession.ssrc == pktSsrc ) |
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105 rtpSession.resolveSsrcConflict(); |
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106 |
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107 long[] csrcArray = pkt.getCsrcArray(); |
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108 if( csrcArray != null) { |
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109 for(int i=0; i< csrcArray.length; i++) { |
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110 if(csrcArray[i] == rtpSession.ssrc); |
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111 rtpSession.resolveSsrcConflict(); |
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112 } |
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113 } |
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114 |
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115 if(RTPSession.rtpDebugLevel > 17) { |
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116 System.out.println("-> RTPReceiverThread.run() rcvd packet, seqNum " + pktSsrc ); |
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117 if(RTPSession.rtpDebugLevel > 10) { |
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118 String str = new String(pkt.getPayload()); |
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119 System.out.println("-> RTPReceiverThread.run() payload is " + str ); |
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120 } |
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121 } |
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122 |
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123 //Find the participant in the database based on SSRC |
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124 Participant part = rtpSession.partDb.getParticipant(pktSsrc); |
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125 |
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126 if(part == null) { |
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127 InetSocketAddress nullSocket = null; |
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128 part = new Participant((InetSocketAddress) packet.getSocketAddress(), nullSocket, pkt.getSsrc()); |
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129 part.unexpected = true; |
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130 rtpSession.partDb.addParticipant(1,part); |
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131 } |
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132 |
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133 // Do checks on whether the datagram came from the expected source for that SSRC. |
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134 if(part.rtpAddress == null || packet.getAddress().equals(part.rtpAddress.getAddress())) { |
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135 PktBuffer pktBuffer = part.pktBuffer; |
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136 |
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137 if(pktBuffer != null) { |
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138 //A buffer already exists, append to it |
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139 pktBuffer.addPkt(pkt); |
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140 } else { |
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141 // Create a new packet/frame buffer |
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142 pktBuffer = new PktBuffer(this.rtpSession, part,pkt); |
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143 part.pktBuffer = pktBuffer; |
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144 } |
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145 } else { |
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146 System.out.println("RTPReceiverThread: Got an unexpected packet from " + pkt.getSsrc() |
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147 + " the sending ip-address was " + packet.getAddress().toString() |
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148 + ", we expected from " + part.rtpAddress.toString()); |
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149 } |
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150 |
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151 // Statistics for receiver report. |
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152 part.updateRRStats(packet.getLength(), pkt); |
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153 // Upate liveness |
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154 part.lastRtpPkt = System.currentTimeMillis(); |
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155 |
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156 if(RTPSession.rtpDebugLevel > 5) { |
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157 System.out.println("<-> RTPReceiverThread signalling pktBufDataReady"); |
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158 } |
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159 |
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160 // Signal the thread that pushes data to application |
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161 rtpSession.pktBufLock.lock(); |
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162 try { rtpSession.pktBufDataReady.signalAll(); } finally { |
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163 rtpSession.pktBufLock.unlock(); |
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164 } |
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165 |
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166 } |
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167 } |
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168 |
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169 } |