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.net.InetSocketAddress; |
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22 import java.util.LinkedList; |
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23 import java.util.ListIterator; |
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24 |
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25 /** |
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26 * Compound RTCP packet class. |
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27 * |
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28 * It basically holds a list of packets. This list can either be constructed by |
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29 * providing a byte[] of a compound packet, or by adding individual packets. |
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30 * |
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31 * Upon encode(), the packet will call encode on all the added packets. |
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32 * |
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33 * problem == 0 indicates the parsing succeeded. |
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34 * |
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35 * |
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36 * @author Arne Kepp |
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37 */ |
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38 |
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39 public class CompRtcpPkt { |
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40 /** Problem indicator, negative values denote packet type that cause problem */ |
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41 protected int problem = 0; |
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42 /** |
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43 * Stores the different subclasses of RtcpPkt that make up the compound |
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44 * packet |
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45 */ |
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46 protected LinkedList<RtcpPkt> rtcpPkts = new LinkedList<RtcpPkt>(); |
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47 |
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48 /** |
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49 * Instantiates an empty Compound RTCP packet to which you can add RTCP |
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50 * packets |
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51 */ |
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52 protected CompRtcpPkt() { |
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53 // Will have to add packets directly to rtcpPkts. |
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54 if (RTPSession.rtpDebugLevel > 7) { |
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55 System.out.println("<-> CompRtcpPkt()"); |
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56 } |
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57 } |
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58 |
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59 /** |
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60 * Add a RTCP packet to the compound packet. Pakcets are added in order, so |
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61 * you have to ensure that a Sender Report or Receiver Report is added |
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62 * first. |
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63 * |
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64 * @param aPkt |
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65 * the packet to be added |
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66 */ |
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67 protected void addPacket(RtcpPkt aPkt) { |
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68 if (RTPSession.rtpDebugLevel > 11) { |
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69 System.out.println(" <-> CompRtcpPkt.addPacket( " |
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70 + aPkt.getClass() + " )"); |
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71 } |
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72 |
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73 if (aPkt.problem == 0) { |
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74 rtcpPkts.add(aPkt); |
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75 } else { |
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76 this.problem = aPkt.problem; |
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77 } |
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78 } |
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79 |
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80 /** |
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81 * Picks a received Compound RTCP packet apart. |
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82 * |
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83 * Only SDES packets are processed directly, other packets are parsed and |
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84 * put into aComptRtcpPkt.rtcpPkts, but not |
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85 * |
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86 * Check the aComptRtcpPkt.problem , if the value is non-zero the packets |
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87 * should probably be discarded. |
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88 * |
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89 * @param rawPkt |
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90 * the byte array received from the socket |
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91 * @param packetSize |
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92 * the actual number of used bytes |
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93 * @param adr |
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94 * the socket address from which the packet was received |
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95 * @param rtpSession |
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96 * the RTPSession with the participant database |
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97 */ |
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98 |
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99 protected void init(byte[] rawPkt, int packetSize, InetSocketAddress adr, |
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100 RTPSession rtpSession) { |
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101 if (RTPSession.rtcpDebugLevel > 7) { |
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102 System.out.println("-> CompRtcpPkt(" + rawPkt.getClass() |
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103 + ", size " + packetSize + ", from " + adr.toString() |
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104 + ", " + rtpSession.getClass() + ")"); |
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105 } |
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106 // System.out.println("rawPkt.length:" + rawPkt.length + " packetSize:" |
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107 // + packetSize); |
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108 |
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109 // Chop it up |
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110 int start = 0; |
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111 |
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112 while (start < packetSize && problem == 0) { |
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113 int length = (StaticProcs.bytesToUIntInt(rawPkt, start + 2)) + 1; |
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114 |
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115 if (length * 4 + start > rawPkt.length) { |
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116 System.out.println("!!!! CompRtcpPkt.(rawPkt,..,..) length (" |
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117 + (length * 4 + start) |
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118 + ") exceeds size of raw packet (" + rawPkt.length |
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119 + ") !"); |
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120 this.problem = -3; |
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121 } |
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122 |
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123 int pktType = (int) rawPkt[start + 1]; |
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124 |
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125 if (pktType < 0) { |
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126 pktType += 256; |
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127 } |
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128 |
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129 if (start == 0) { |
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130 // Compound packets need to start with SR or RR |
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131 if (pktType != 200 && pktType != 201) { |
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132 if (RTPSession.rtcpDebugLevel > 3) { |
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133 System.out |
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134 .println("!!!! CompRtcpPkt(rawPkt...) packet did not start with SR or RR"); |
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135 } |
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136 this.problem = -1; |
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137 } |
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138 |
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139 // Padding bit should be zero for the first packet |
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140 if (((rawPkt[start] & 0x20) >>> 5) == 1) { |
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141 if (RTPSession.rtcpDebugLevel > 3) { |
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142 System.out |
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143 .println("!!!! CompRtcpPkt(rawPkt...) first packet was padded"); |
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144 } |
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145 this.problem = -2; |
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146 } |
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147 } |
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148 |
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149 // System.out.println("start: " + start + " pktType: " + pktType + |
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150 // " length:" + length ); |
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151 if (pktType == 200) { |
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152 addPacket(new RtcpPktSR(rawPkt, start, length * 4)); |
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153 } else if (pktType == 201) { |
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154 addPacket(new RtcpPktRR(rawPkt, start, -1)); |
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155 } else if (pktType == 202) { |
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156 addPacket(new RtcpPktSDES(rawPkt, start, adr, rtpSession.partDb)); |
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157 } else if (pktType == 203) { |
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158 addPacket(new RtcpPktBYE(rawPkt, start)); |
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159 } else if (pktType == 204) { |
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160 addPacket(new RtcpPktAPP(rawPkt, start)); |
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161 } else if (pktType == 205) { |
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162 addPacket(new RtcpPktRTPFB(rawPkt, start, rtpSession)); |
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163 } else if (pktType == 206) { |
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164 addPacket(new RtcpPktPSFB(rawPkt, start, rtpSession)); |
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165 } else { |
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166 System.out |
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167 .println("!!!! CompRtcpPkt(byte[] rawPkt, int packetSize...) " |
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168 + "UNKNOWN RTCP PACKET TYPE:" + pktType); |
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169 } |
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170 |
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171 // System.out.println(" start:" + start + " pktType:" + pktType + |
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172 // " length:" + length); |
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173 |
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174 start += length * 4; |
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175 |
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176 if (RTPSession.rtcpDebugLevel > 12) { |
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177 System.out.println(" start:" + start + " parsing pktType " |
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178 + pktType + " length: " + length); |
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179 } |
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180 } |
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181 if (RTPSession.rtcpDebugLevel > 7) { |
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182 System.out.println("<- CompRtcpPkt(rawPkt....)"); |
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183 } |
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184 } |
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185 |
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186 /** |
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187 * Encode combines the RTCP packets in this.rtcpPkts into a byte[] by |
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188 * calling the encode() function on each of them individually. |
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189 * |
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190 * The order of rtcpPkts is preserved, so a RR or SR packet must be first. |
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191 * |
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192 * @return the trimmed byte[] representation of the packet, ready to go into |
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193 * a UDP packet. |
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194 */ |
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195 protected byte[] encode() { |
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196 if (RTPSession.rtpDebugLevel > 9) { |
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197 System.out.println(" <- CompRtcpPkt.encode()"); |
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198 } |
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199 |
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200 ListIterator<RtcpPkt> iter = rtcpPkts.listIterator(); |
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201 |
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202 byte[] rawPkt = new byte[1500]; |
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203 int index = 0; |
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204 |
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205 while (iter.hasNext()) { |
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206 RtcpPkt aPkt = (RtcpPkt) iter.next(); |
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207 |
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208 if (aPkt.packetType == 200) { |
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209 RtcpPktSR pkt = (RtcpPktSR) aPkt; |
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210 pkt.encode(); |
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211 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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212 pkt.rawPkt.length); |
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213 index += pkt.rawPkt.length; |
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214 } else if (aPkt.packetType == 201) { |
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215 RtcpPktRR pkt = (RtcpPktRR) aPkt; |
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216 pkt.encode(); |
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217 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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218 pkt.rawPkt.length); |
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219 index += pkt.rawPkt.length; |
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220 } else if (aPkt.packetType == 202) { |
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221 RtcpPktSDES pkt = (RtcpPktSDES) aPkt; |
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222 pkt.encode(); |
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223 // System.out.println(" ENCODE SIZE: " + pkt.rawPkt.length); |
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224 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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225 pkt.rawPkt.length); |
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226 index += pkt.rawPkt.length; |
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227 } else if (aPkt.packetType == 203) { |
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228 RtcpPktBYE pkt = (RtcpPktBYE) aPkt; |
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229 pkt.encode(); |
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230 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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231 pkt.rawPkt.length); |
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232 index += pkt.rawPkt.length; |
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233 } else if (aPkt.packetType == 204) { |
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234 RtcpPktAPP pkt = (RtcpPktAPP) aPkt; |
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235 pkt.encode(); |
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236 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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237 pkt.rawPkt.length); |
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238 index += pkt.rawPkt.length; |
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239 } else if (aPkt.packetType == 205) { |
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240 RtcpPktRTPFB pkt = (RtcpPktRTPFB) aPkt; |
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241 pkt.encode(); |
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242 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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243 pkt.rawPkt.length); |
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244 index += pkt.rawPkt.length; |
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245 } else if (aPkt.packetType == 206) { |
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246 RtcpPktPSFB pkt = (RtcpPktPSFB) aPkt; |
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247 pkt.encode(); |
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248 System.arraycopy(pkt.rawPkt, 0, rawPkt, index, |
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249 pkt.rawPkt.length); |
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250 index += pkt.rawPkt.length; |
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251 } else { |
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252 System.out.println("CompRtcpPkt aPkt.packetType:" |
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253 + aPkt.packetType); |
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254 } |
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255 // System.out.println(" packetType:" + aPkt.packetType + " length:" |
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256 // + aPkt.rawPkt.length + " index:" + index); |
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257 } |
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258 |
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259 byte[] output = new byte[index]; |
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260 |
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261 System.arraycopy(rawPkt, 0, output, 0, index); |
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262 |
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263 if (RTPSession.rtpDebugLevel > 9) { |
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264 System.out.println(" -> CompRtcpPkt.encode()"); |
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265 } |
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266 return output; |
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267 } |
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268 } |
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