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 /** |
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22 * RTCP packets for Payload-Specific Feedback Messages |
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23 * |
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24 * @author Arne Kepp |
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25 */ |
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26 public class RtcpPktPSFB extends RtcpPkt { |
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27 /** If this packet was for a different SSRC */ |
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28 protected boolean notRelevant = false; |
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29 /** Parent RTP Session */ |
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30 private RTPSession rtpSession; |
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31 /** SSRC we are sending feeback to */ |
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32 protected long ssrcMediaSource = -1; |
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33 |
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34 /** SLI macroblock (MB) address of the first lost macroblock number */ |
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35 protected int[] sliFirst; |
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36 /** SLI number of lost macroblocks */ |
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37 protected int[] sliNumber; |
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38 /** SLI six least significant bits of the codec-specific identifier */ |
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39 protected int[] sliPictureId; |
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40 |
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41 // Picture loss indication |
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42 /** RPSI number of padded bits at end of bitString */ |
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43 protected int rpsiPadding = -1; |
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44 /** RPSI payloadType RTP payload type */ |
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45 protected int rpsiPayloadType = -1; |
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46 /** RPSI information as natively defined by the video codec */ |
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47 protected byte[] rpsiBitString; |
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48 |
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49 /** Application Layer Feedback Message */ |
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50 protected byte[] alfBitString; |
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51 |
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52 /** |
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53 * Generic constructor, then call make<something> |
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54 * |
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55 * @param ssrcPacketSender |
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56 * @param ssrcMediaSource |
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57 */ |
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58 protected RtcpPktPSFB(long ssrcPacketSender, long ssrcMediaSource) { |
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59 super.ssrc = ssrcPacketSender; |
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60 this.ssrcMediaSource = ssrcMediaSource; |
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61 super.packetType = 206; //PSFB |
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62 } |
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63 |
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64 /** |
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65 * Make this packet a Picture loss indication |
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66 */ |
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67 protected void makePictureLossIndication() { |
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68 super.itemCount = 1; //FMT |
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69 } |
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70 |
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71 /** |
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72 * Make this packet a Slice Loss Indication |
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73 * |
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74 * @param sliFirst macroblock (MB) address of the first lost macroblock |
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75 * @param sliNumber number of lost macroblocks |
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76 * @param sliPictureId six least significant bits of the codec-specific identifier |
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77 */ |
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78 protected void makeSliceLossIndication(int[] sliFirst, int[] sliNumber, int[] sliPictureId) { |
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79 super.itemCount = 2; //FMT |
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80 this.sliFirst = sliFirst; |
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81 this.sliNumber = sliNumber; |
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82 this.sliPictureId = sliPictureId; |
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83 } |
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84 |
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85 /** |
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86 * Make this packet a Reference Picture Selection Indication |
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87 * |
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88 * @param bitPadding number of padded bits at end of bitString |
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89 * @param payloadType RTP payload type for codec |
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90 * @param bitString RPSI information as natively defined by the video codec |
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91 */ |
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92 protected void makeRefPictureSelIndic(int bitPadding, int payloadType, byte[] bitString) { |
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93 super.itemCount = 3; //FMT |
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94 this.rpsiPadding = bitPadding; |
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95 this.rpsiPayloadType = payloadType; |
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96 this.rpsiBitString = bitString; |
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97 } |
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98 |
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99 /** |
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100 * Make this packet an Application specific feedback message |
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101 * |
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102 * @param bitString the original application message |
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103 */ |
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104 protected void makeAppLayerFeedback(byte[] bitString) { |
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105 super.itemCount = 15; //FMT |
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106 this.alfBitString = bitString; |
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107 } |
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108 |
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109 /** |
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110 * Constructor that parses a raw packet to retrieve information |
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111 * |
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112 * @param aRawPkt the raw packet to be parsed |
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113 * @param start the start of the packet, in bytes |
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114 * @param rtpSession the session on which the callback interface resides |
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115 */ |
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116 protected RtcpPktPSFB(byte[] aRawPkt, int start, RTPSession rtpSession) { |
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117 if(RTPSession.rtpDebugLevel > 8) { |
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118 System.out.println(" -> RtcpPktPSFB(byte[], int start)"); |
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119 } |
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120 this.rtpSession = rtpSession; |
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121 |
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122 rawPkt = aRawPkt; |
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123 |
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124 if(! super.parseHeaders(start) || packetType != 206 || super.length < 2 ) { |
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125 if(RTPSession.rtpDebugLevel > 2) { |
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126 System.out.println(" <-> RtcpPktRTPFB.parseHeaders() etc. problem"); |
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127 } |
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128 super.problem = -206; |
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129 } else { |
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130 //FMT = super.itemCount; |
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131 ssrcMediaSource = StaticProcs.bytesToUIntLong(aRawPkt,8+start); |
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132 |
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133 if(ssrcMediaSource == rtpSession.ssrc) { |
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134 super.ssrc = StaticProcs.bytesToUIntLong(aRawPkt,4+start); |
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135 |
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136 switch(super.itemCount) { |
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137 case 1: // Picture Loss Indication |
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138 decPictureLossIndic(); |
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139 break; |
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140 case 2: // Slice Loss Indication |
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141 decSliceLossIndic(aRawPkt, start + 12); |
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142 break; |
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143 case 3: // Reference Picture Selection Indication |
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144 decRefPictureSelIndic(aRawPkt, start + 12); |
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145 break; |
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146 case 15: // Application Layer Feedback Messages |
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147 decAppLayerFB(aRawPkt, start + 12); |
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148 break; |
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149 default: |
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150 System.out.println("!!!! RtcpPktPSFB(byte[], int start) unexpected FMT " + super.itemCount); |
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151 } |
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152 } else { |
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153 this.notRelevant = true; |
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154 } |
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155 } |
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156 if(RTPSession.rtpDebugLevel > 8) { |
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157 System.out.println(" <- RtcpPktPSFB()"); |
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158 } |
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159 } |
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160 |
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161 /** |
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162 * Decode Picture Loss indication |
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163 * |
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164 */ |
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165 private void decPictureLossIndic() { |
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166 if(this.rtpSession.rtcpAVPFIntf != null) { |
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167 this.rtpSession.rtcpAVPFIntf.PSFBPktPictureLossReceived( |
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168 super.ssrc); |
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169 } |
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170 } |
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171 |
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172 /** |
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173 * Decode Slice Loss Indication |
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174 * |
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175 * @param aRawPkt |
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176 * @param start |
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177 */ |
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178 private void decSliceLossIndic(byte[] aRawPkt, int start) { |
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179 // 13 bit off-boundary numbers? That's rather cruel |
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180 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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181 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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182 // | First | Number | PictureID | |
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183 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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184 |
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185 int count = super.length - 2; |
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186 |
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187 sliFirst = new int[count]; |
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188 sliNumber = new int[count]; |
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189 sliPictureId = new int[count]; |
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190 |
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191 // Loop over the FCI lines |
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192 for(int i=0; i < count; i++) { |
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193 sliFirst[i] = StaticProcs.bytesToUIntInt(aRawPkt, start) >> 3; |
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194 sliNumber[i] = (int) (StaticProcs.bytesToUIntInt(aRawPkt, start) & 0x0007FFC0) >> 6; |
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195 sliPictureId[i] = (StaticProcs.bytesToUIntInt(aRawPkt, start + 2) & 0x003F); |
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196 start += 4; |
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197 } |
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198 |
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199 if(this.rtpSession.rtcpAVPFIntf != null) { |
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200 this.rtpSession.rtcpAVPFIntf.PSFBPktSliceLossIndic( |
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201 super.ssrc, |
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202 sliFirst, sliNumber, sliPictureId); |
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203 } |
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204 } |
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205 |
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206 /** |
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207 * Decode Reference Picture Selection Indication |
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208 * |
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209 * @param aRawPkt |
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210 * @param start |
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211 */ |
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212 private void decRefPictureSelIndic(byte[] aRawPkt, int start) { |
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213 // 0 1 2 3 |
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214 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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215 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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216 // | PB |0| Payload Type| Native RPSI bit string | |
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217 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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218 // | defined per codec ... | Padding (0) | |
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219 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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220 |
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221 rpsiPadding = aRawPkt[start]; |
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222 |
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223 if(rpsiPadding > 32) { |
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224 System.out.println("!!!! RtcpPktPSFB.decRefPictureSelcIndic paddingBits: " |
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225 + rpsiPadding); |
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226 } |
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227 |
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228 rpsiPayloadType = (int) rawPkt[start]; |
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229 if(rpsiPayloadType < 0) { |
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230 System.out.println("!!!! RtcpPktPSFB.decRefPictureSelcIndic 8th bit not zero: " |
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231 + rpsiPayloadType); |
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232 } |
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233 |
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234 rpsiBitString = new byte[(super.length - 2)*4 - 2]; |
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235 System.arraycopy(aRawPkt, start + 2, rpsiBitString, 0, rpsiBitString.length); |
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236 |
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237 if(this.rtpSession.rtcpAVPFIntf != null) { |
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238 this.rtpSession.rtcpAVPFIntf.PSFBPktRefPictureSelIndic( |
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239 super.ssrc, |
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240 rpsiPayloadType, rpsiBitString, rpsiPadding); |
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241 } |
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242 |
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243 } |
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244 |
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245 /** |
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246 * Decode Application specific feedback message |
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247 * |
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248 * @param aRawPkt |
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249 * @param start |
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250 */ |
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251 private void decAppLayerFB(byte[] aRawPkt, int start) { |
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252 //Application Message (FCI): variable length |
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253 int stringLength = (super.length - 2)*4; |
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254 |
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255 alfBitString = new byte[stringLength]; |
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256 |
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257 System.arraycopy(aRawPkt, start, alfBitString, 0, stringLength); |
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258 |
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259 if(this.rtpSession.rtcpAVPFIntf != null) { |
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260 this.rtpSession.rtcpAVPFIntf.PSFBPktAppLayerFBReceived( |
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261 super.ssrc, alfBitString); |
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262 } |
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263 } |
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264 |
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265 |
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266 |
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267 /** |
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268 * Encode a Slice Loss Indication |
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269 */ |
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270 private void encSliceLossIndic() { |
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271 byte[] firstBytes; |
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272 byte[] numbBytes; |
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273 byte[] picBytes; |
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274 |
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275 int offset = 8; |
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276 // Loop over the FCI lines |
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277 for(int i=0; i < sliFirst.length; i++) { |
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278 offset = 8 + 8*i; |
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279 firstBytes = StaticProcs.uIntLongToByteWord(sliFirst[i] << 3); |
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280 numbBytes = StaticProcs.uIntLongToByteWord(sliNumber[i] << 2); |
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281 picBytes = StaticProcs.uIntIntToByteWord(sliPictureId[i]); |
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282 |
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283 super.rawPkt[offset] = firstBytes[2]; |
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284 super.rawPkt[offset+1] = (byte) (firstBytes[3] | numbBytes[2]); |
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285 super.rawPkt[offset+2] = numbBytes[3]; |
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286 super.rawPkt[offset+3] = (byte) (numbBytes[3] | picBytes[1]); |
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287 } |
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288 } |
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289 |
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290 /** |
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291 * Encode a Reference Picture Selection Indication |
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292 * |
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293 */ |
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294 private void encRefPictureSelIndic() { |
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295 byte[] someBytes; |
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296 someBytes = StaticProcs.uIntIntToByteWord(rpsiPadding); |
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297 super.rawPkt[8] = someBytes[1]; |
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298 someBytes = StaticProcs.uIntIntToByteWord(rpsiPayloadType); |
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299 super.rawPkt[9] = someBytes[1]; |
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300 |
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301 System.arraycopy(rpsiBitString, 0, super.rawPkt, 10, rpsiBitString.length); |
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302 } |
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303 |
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304 |
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305 /** |
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306 * Encode Application Layer Feedback |
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307 * |
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308 */ |
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309 private void encAppLayerFB() { |
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310 //Application Message (FCI): variable length |
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311 System.arraycopy(alfBitString, 0, super.rawPkt, 8, alfBitString.length); |
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312 } |
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313 |
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314 /** |
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315 * Get the FMT (Feedback Message Type) |
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316 * @return value stored in .itemcount, same field |
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317 */ |
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318 protected int getFMT() { |
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319 return this.itemCount; |
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320 } |
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321 |
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322 /** |
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323 * Encode the packet into a byte[], saved in .rawPkt |
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324 * |
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325 * CompRtcpPkt will call this automatically |
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326 */ |
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327 protected void encode() { |
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328 switch(super.itemCount) { |
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329 case 1: // Picture Loss Indication |
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330 //Nothing to do really |
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331 super.rawPkt = new byte[24]; |
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332 break; |
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333 case 2: // Slice Loss Indication |
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334 super.rawPkt = new byte[24 + 4*this.sliFirst.length]; |
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335 encSliceLossIndic(); |
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336 break; |
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337 case 3: // Reference Picture Selection Indication |
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338 super.rawPkt = new byte[24 + 2 + this.rpsiBitString.length/4]; |
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339 encRefPictureSelIndic(); |
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340 break; |
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341 case 15: // Application Layer Feedback Messages |
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342 super.rawPkt = new byte[24 + this.alfBitString.length/4]; |
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343 encAppLayerFB(); |
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344 break; |
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345 } |
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346 |
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347 byte[] someBytes = StaticProcs.uIntLongToByteWord(super.ssrc); |
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348 System.arraycopy(someBytes, 0, super.rawPkt, 4, 4); |
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349 someBytes = StaticProcs.uIntLongToByteWord(this.ssrcMediaSource); |
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350 System.arraycopy(someBytes, 0, super.rawPkt, 8, 4); |
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351 |
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352 writeHeaders(); |
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353 } |
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354 |
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355 /** |
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356 * Debug purposes only |
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357 */ |
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358 public void debugPrint() { |
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359 System.out.println("->RtcpPktPSFB.debugPrint() "); |
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360 |
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361 String str; |
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362 switch(super.itemCount) { |
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363 case 1: // Picture Loss Indication |
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364 System.out.println(" FMT: Picture Loss Indication"); |
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365 break; |
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366 case 2: // Slice Loss Indication |
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367 if(sliFirst != null) { |
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368 str = "sliFirst[].length: " + sliFirst.length; |
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369 } else { |
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370 str = "sliFirst[] is null"; |
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371 } |
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372 System.out.println(" FMT: Slice Loss Indication, " + str); |
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373 break; |
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374 case 3: // Reference Picture Selection Indication |
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375 if(rpsiBitString != null) { |
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376 str = "rpsiBitString[].length: " + rpsiBitString.length; |
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377 } else { |
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378 str = "rpsiBitString[] is null"; |
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379 } |
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380 System.out.println(" FMT: Reference Picture Selection Indication, " |
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381 + str + " payloadType: " + this.rpsiPayloadType); |
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382 break; |
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383 case 15: // Application Layer Feedback Messages |
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384 if(alfBitString != null) { |
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385 str = "alfBitString[].length: " + alfBitString.length; |
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386 } else { |
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387 str = "alfBitString[] is null"; |
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388 } |
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389 System.out.println(" FMT: Application Layer Feedback Messages, " + str); |
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390 break; |
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391 } |
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392 |
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393 System.out.println("<-RtcpPktPSFB.debugPrint() "); |
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394 } |
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395 } |
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