| 1 | package cz.vutbr.feec.packets.rtp; |
| 2 | |
| 3 | import java.util.Vector; |
| 4 | |
| 5 | import cz.vutbr.feec.packets.IPacket; |
| 6 | import cz.vutbr.feec.packets.PacketGenerateException; |
| 7 | import cz.vutbr.feec.packets.PacketParseException; |
| 8 | import cz.vutbr.feec.packets.PacketUtils; |
| 9 | import cz.vutbr.feec.session.rtprtcp.internal.RTCPConstants; |
| 10 | |
| 11 | /** |
| 12 | * This class encapsulates all the necessary parameters of a RTCP Packet that |
| 13 | * needs to be handed to the Application when a RTCP Packet is received.This |
| 14 | * class represents the least common denominator in an RTCP Packet. It is |
| 15 | * equivalent to an abstract base class from which RTCPSenderReportPacket and |
| 16 | * RTCPReceiverReportPacket derive from. |
| 17 | */ |
| 18 | public class RTPPacket implements IPacket { |
| 19 | |
| 20 | private int version = 2; |
| 21 | private int padding = RTCPConstants.PADDING; |
| 22 | private int extension = RTCPConstants.EXTENSION; |
| 23 | private int CSRCcount; |
| 24 | private int marker = RTCPConstants.MARKER; |
| 25 | private int payloadtype; |
| 26 | private long seqNum; |
| 27 | private long timeStamp; |
| 28 | private long SSRC; |
| 29 | private Vector<RTP_CSRC_Group> CSRCList = new Vector<RTP_CSRC_Group>(); |
| 30 | private byte[] data; |
| 31 | private int dataLength; |
| 32 | private int offset; |
| 33 | |
| 34 | public void addGroupBlock(RTP_CSRC_Group item) { |
| 35 | CSRCList.add(item); |
| 36 | } |
| 37 | |
| 38 | public RTP_CSRC_Group getGroupBlock(int index) { |
| 39 | |
| 40 | return CSRCList.get(index); |
| 41 | } |
| 42 | |
| 43 | public byte[] getData() { |
| 44 | return data; |
| 45 | } |
| 46 | |
| 47 | public void clearData(int length) { |
| 48 | |
| 49 | for (int i = 0; i < length; i++) { |
| 50 | data[i] = 0; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | public void setData(byte[] data, int offset, int length) { |
| 55 | this.offset = offset; |
| 56 | this.data = data; |
| 57 | this.dataLength = length; |
| 58 | } |
| 59 | |
| 60 | private void parseData(byte[] buffer, int start, int length) { |
| 61 | |
| 62 | int i; |
| 63 | this.data = new byte[length - offset]; |
| 64 | |
| 65 | for (i = offset; i < length; i++) { |
| 66 | |
| 67 | this.data[i - offset + this.offset] = buffer[i]; |
| 68 | |
| 69 | } |
| 70 | |
| 71 | this.dataLength = i - offset; |
| 72 | } |
| 73 | |
| 74 | public int getDataLength() { |
| 75 | return dataLength; |
| 76 | } |
| 77 | |
| 78 | public int getVersion() { |
| 79 | return version; |
| 80 | } |
| 81 | |
| 82 | public void setVersion(int version) { |
| 83 | this.version = version; |
| 84 | } |
| 85 | |
| 86 | public int getPadding() { |
| 87 | return padding; |
| 88 | } |
| 89 | |
| 90 | public void setPadding(int padding) { |
| 91 | this.padding = padding; |
| 92 | } |
| 93 | |
| 94 | public int getExtension() { |
| 95 | return extension; |
| 96 | } |
| 97 | |
| 98 | public void setExtension(int extension) { |
| 99 | this.extension = extension; |
| 100 | } |
| 101 | |
| 102 | public int getMarker() { |
| 103 | return marker; |
| 104 | } |
| 105 | |
| 106 | public void setMarker(int marker) { |
| 107 | this.marker = marker; |
| 108 | } |
| 109 | |
| 110 | public int getPayloadtype() { |
| 111 | return payloadtype; |
| 112 | } |
| 113 | |
| 114 | public void setPayloadtype(int payloadtype) { |
| 115 | this.payloadtype = payloadtype; |
| 116 | } |
| 117 | |
| 118 | public long getSeqNum() { |
| 119 | return seqNum; |
| 120 | } |
| 121 | |
| 122 | public void setSeqNum(long seqNum) { |
| 123 | this.seqNum = seqNum; |
| 124 | } |
| 125 | |
| 126 | public long getTimeStamp() { |
| 127 | return timeStamp; |
| 128 | } |
| 129 | |
| 130 | public void setTimeStamp(long timeStamp) { |
| 131 | this.timeStamp = timeStamp; |
| 132 | } |
| 133 | |
| 134 | public long getSSRC() { |
| 135 | return SSRC; |
| 136 | } |
| 137 | |
| 138 | public void setSSRC(long ssrc) { |
| 139 | SSRC = ssrc; |
| 140 | } |
| 141 | |
| 142 | public int generate(byte[] buffer, int offset) |
| 143 | throws PacketGenerateException { |
| 144 | |
| 145 | assert PacketUtils.checkSize(this.getVersion(), 2); |
| 146 | assert PacketUtils.checkSize(this.getPadding(), 1); |
| 147 | assert PacketUtils.checkSize(this.getExtension(), 1); |
| 148 | assert PacketUtils.checkSize(this.getCSRCcount(), 4); |
| 149 | assert PacketUtils.checkSize(this.getMarker(), 1); |
| 150 | assert PacketUtils.checkSize(this.getSeqNum(), 16); |
| 151 | assert PacketUtils.checkSize(this.getTimeStamp(), 32); |
| 152 | assert PacketUtils.checkSize(this.getSSRC(), 32); |
| 153 | |
| 154 | byte V_P_X_CSRCcount = (byte) ((this.getVersion() << 6) & 0xC0 |
| 155 | | (this.getPadding() << 5) & 0x20 | (this.getExtension() << 4) |
| 156 | & 0x10 | this.getCSRCcount() & 0x0F); |
| 157 | buffer[offset] = V_P_X_CSRCcount; |
| 158 | |
| 159 | byte M_payload = (byte) ((this.getMarker() << 7) & 0x80 | (this |
| 160 | .getPayloadtype() & 0x7F)); |
| 161 | buffer[offset + 1] = M_payload; |
| 162 | |
| 163 | PacketUtils.setOctet2(buffer, offset + 2, this.getSeqNum()); |
| 164 | PacketUtils.setOctet4(buffer, offset + 4, this.getTimeStamp()); |
| 165 | PacketUtils.setOctet4(buffer, offset + 8, this.getSSRC()); |
| 166 | |
| 167 | int item_bytes = 0; |
| 168 | for (RTP_CSRC_Group group : CSRCList) { |
| 169 | |
| 170 | assert PacketUtils.checkSize(group.getCSRCidentifier(), 32); |
| 171 | PacketUtils.setOctet4(buffer, offset + 12 + item_bytes, group |
| 172 | .getCSRCidentifier()); |
| 173 | item_bytes = item_bytes + 4; |
| 174 | |
| 175 | } |
| 176 | |
| 177 | int length = this.getDataLength(); |
| 178 | for (int i = 0; i < length; i++) { |
| 179 | buffer[offset + 12 + item_bytes + i] = this.getData()[i]; |
| 180 | } |
| 181 | |
| 182 | return (12 + (length / 4) + 4 * this.getCSRCcount()); |
| 183 | } |
| 184 | |
| 185 | public int parse(byte[] resultArray, int startPos, int length) |
| 186 | throws PacketParseException { |
| 187 | // pri kazdem je nutne vymazat stare CSSRC |
| 188 | CSRCList.clear(); |
| 189 | |
| 190 | int first = PacketUtils.getOctet1(resultArray, startPos); |
| 191 | this.setVersion((first & 0xC0) >> 6); |
| 192 | this.setPadding((first & 0x20) >> 5); |
| 193 | this.setExtension((first & 0x10) >> 4); |
| 194 | this.setCSRCcount(first & 0x0F); |
| 195 | |
| 196 | int second = PacketUtils.getOctet1(resultArray, startPos + 1); |
| 197 | this.setMarker((second & 0x80) >> 7); |
| 198 | this.setPayloadtype(second & 0x7F); |
| 199 | |
| 200 | this.setSeqNum(PacketUtils.getOctet2(resultArray, startPos + 2)); |
| 201 | |
| 202 | this.setTimeStamp(PacketUtils.getOctet4(resultArray, startPos + 4)); |
| 203 | this.setSSRC(PacketUtils.getOctet4(resultArray, startPos + 8)); |
| 204 | |
| 205 | for (int i = 0; i < this.getCSRCcount(); i++) { |
| 206 | |
| 207 | RTP_CSRC_Group item = new RTP_CSRC_Group(); |
| 208 | item.setCSRCidentifier(PacketUtils.getOctet4(resultArray, 12 + 4 |
| 209 | * i + startPos)); |
| 210 | this.addGroupBlock(item); |
| 211 | } |
| 212 | |
| 213 | this.parseData(resultArray, startPos + 12 + (4 * this.getCSRCcount()), |
| 214 | length); |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * public int getCSSRCCount() { return CSSRCList.size(); } public void |
| 221 | * addCSSRC(long cssrc) { CSSRCList.add(cssrc); } |
| 222 | */ |
| 223 | |
| 224 | public int getCSRCcount() { |
| 225 | return CSRCcount; |
| 226 | } |
| 227 | |
| 228 | public void setCSRCcount(int ccount) { |
| 229 | CSRCcount = ccount; |
| 230 | } |
| 231 | } |