Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | // Copyright (C) 1999-2005 Open Source Telecom Corporation. |
| 2 | // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. |
| 3 | // |
| 4 | // This program is free software; you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation; either version 2 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program; if not, write to the Free Software |
| 16 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | // |
| 18 | // As a special exception, you may use this file as part of a free software |
| 19 | // library without restriction. Specifically, if other files instantiate |
| 20 | // templates or use macros or inline functions from this file, or you compile |
| 21 | // this file and link it with other files to produce an executable, this |
| 22 | // file does not by itself cause the resulting executable to be covered by |
| 23 | // the GNU General Public License. This exception does not however |
| 24 | // invalidate any other reasons why the executable file might be covered by |
| 25 | // the GNU General Public License. |
| 26 | // |
| 27 | // This exception applies only to the code released under the name GNU |
| 28 | // ccRTP. If you copy code from other releases into a copy of GNU |
| 29 | // ccRTP, as the General Public License permits, the exception does |
| 30 | // not apply to the code that you add in this way. To avoid misleading |
| 31 | // anyone as to the status of such modified files, you must delete |
| 32 | // this exception notice from them. |
| 33 | // |
| 34 | // If you write modifications of your own for GNU ccRTP, it is your choice |
| 35 | // whether to permit this exception to apply to your modifications. |
| 36 | // If you do not wish that, delete this exception notice. |
| 37 | // |
| 38 | |
| 39 | /** |
| 40 | * @file control.cpp |
| 41 | * |
| 42 | * @short QueueRTCPManager classes implementation. |
| 43 | **/ |
| 44 | |
| 45 | #include "private.h" |
| 46 | #include <cstdlib> |
| 47 | #include <ccrtp/cqueue.h> |
| 48 | #include <cstdlib> |
| 49 | #include <climits> |
| 50 | |
| 51 | #ifdef CCXX_NAMESPACES |
| 52 | namespace ost { |
| 53 | #endif |
| 54 | |
| 55 | const uint16 QueueRTCPManager::TIMEOUT_MULTIPLIER = 5; |
| 56 | const double QueueRTCPManager::RECONSIDERATION_COMPENSATION = 2.718281828 - 1.5; |
| 57 | const SDESItemType QueueRTCPManager::firstSchedulable = SDESItemTypeNAME; |
| 58 | const SDESItemType QueueRTCPManager::lastSchedulable = SDESItemTypePRIV; |
| 59 | /// maximum end to end delay: unlimited |
| 60 | const microtimeout_t QueueRTCPManager::defaultEnd2EndDelay = 0; |
| 61 | |
| 62 | QueueRTCPManager::QueueRTCPManager(uint32 size, RTPApplication& app): |
| 63 | RTPDataQueue(size), RTCPCompoundHandler(RTCPCompoundHandler::defaultPathMTU), |
| 64 | queueApplication(app) |
| 65 | { |
| 66 | controlServiceActive = false; |
| 67 | controlBwFract = 0.05f; |
| 68 | sendControlBwFract = 0.25; |
| 69 | recvControlBwFract = 1-sendControlBwFract; |
| 70 | ctrlSendCount = 0; |
| 71 | |
| 72 | lowerHeadersSize = networkHeaderSize() + transportHeaderSize(); |
| 73 | |
| 74 | nextScheduledSDESItem = SDESItemTypeNAME; |
| 75 | |
| 76 | // initialize RTCP timing |
| 77 | reconsInfo.rtcpTp.tv_sec = reconsInfo.rtcpTc.tv_sec = |
| 78 | reconsInfo.rtcpTn.tv_sec = 0; |
| 79 | reconsInfo.rtcpTp.tv_usec = reconsInfo.rtcpTc.tv_usec = |
| 80 | reconsInfo.rtcpTn.tv_usec = 0; |
| 81 | reconsInfo.rtcpPMembers = 1; |
| 82 | |
| 83 | rtcpWeSent = false; |
| 84 | rtcpAvgSize = sizeof(RTCPFixedHeader) + sizeof(uint32) + |
| 85 | sizeof(SenderInfo); |
| 86 | rtcpInitial = true; |
| 87 | // force an initial check for incoming RTCP packets |
| 88 | gettimeofday(&rtcpNextCheck,NULL); |
| 89 | // check for incoming RTCP packets every 1/4 seconds. |
| 90 | rtcpCheckInterval.tv_sec = 0; |
| 91 | rtcpCheckInterval.tv_usec = 250000; |
| 92 | timersub(&rtcpNextCheck,&rtcpCheckInterval,&rtcpLastCheck); |
| 93 | |
| 94 | lastSendPacketCount = 0; |
| 95 | |
| 96 | rtcpMinInterval = 5000000; // 5 seconds. |
| 97 | |
| 98 | leavingDelay = 1000000; // 1 second |
| 99 | end2EndDelay = getDefaultEnd2EndDelay(); |
| 100 | |
| 101 | // Fill in fixed fields that will never change |
| 102 | RTCPPacket* pkt = reinterpret_cast<RTCPPacket*>(rtcpSendBuffer); |
| 103 | pkt->fh.version = CCRTP_VERSION; |
| 104 | // (SSRCCollision will have to take this into account) |
| 105 | pkt->info.SR.ssrc = getLocalSSRCNetwork(); |
| 106 | |
| 107 | // allow to start RTCP service once everything is set up |
| 108 | controlServiceActive = true; |
| 109 | } |
| 110 | |
| 111 | // TODO Streamline this code (same as above, put into a separate method) |
| 112 | QueueRTCPManager::QueueRTCPManager(uint32 ssrc, uint32 size, RTPApplication& app): |
| 113 | RTPDataQueue(&ssrc, size), |
| 114 | RTCPCompoundHandler(RTCPCompoundHandler::defaultPathMTU), |
| 115 | queueApplication(app) |
| 116 | { |
| 117 | controlServiceActive = false; |
| 118 | controlBwFract = 0.05f; |
| 119 | sendControlBwFract = 0.25; |
| 120 | recvControlBwFract = 1-sendControlBwFract; |
| 121 | ctrlSendCount = 0; |
| 122 | |
| 123 | lowerHeadersSize = networkHeaderSize() + transportHeaderSize(); |
| 124 | |
| 125 | nextScheduledSDESItem = SDESItemTypeNAME; |
| 126 | |
| 127 | // initialize RTCP timing |
| 128 | reconsInfo.rtcpTp.tv_sec = reconsInfo.rtcpTc.tv_sec = |
| 129 | reconsInfo.rtcpTn.tv_sec = 0; |
| 130 | |
| 131 | reconsInfo.rtcpTp.tv_usec = reconsInfo.rtcpTc.tv_usec = |
| 132 | reconsInfo.rtcpTn.tv_usec = 0; |
| 133 | |
| 134 | reconsInfo.rtcpPMembers = 1; |
| 135 | |
| 136 | rtcpWeSent = false; |
| 137 | rtcpAvgSize = sizeof(RTCPFixedHeader) + sizeof(uint32) + sizeof(SenderInfo); |
| 138 | rtcpInitial = true; |
| 139 | // force an initial check for incoming RTCP packets |
| 140 | gettimeofday(&rtcpNextCheck,NULL); |
| 141 | // check for incoming RTCP packets every 1/4 seconds. |
| 142 | rtcpCheckInterval.tv_sec = 0; |
| 143 | rtcpCheckInterval.tv_usec = 250000; |
| 144 | timersub(&rtcpNextCheck,&rtcpCheckInterval,&rtcpLastCheck); |
| 145 | |
| 146 | lastSendPacketCount = 0; |
| 147 | |
| 148 | rtcpMinInterval = 5000000; // 5 seconds. |
| 149 | |
| 150 | leavingDelay = 1000000; // 1 second |
| 151 | end2EndDelay = getDefaultEnd2EndDelay(); |
| 152 | |
| 153 | // Fill in fixed fields that will never change |
| 154 | RTCPPacket* pkt = reinterpret_cast<RTCPPacket*>(rtcpSendBuffer); |
| 155 | pkt->fh.version = CCRTP_VERSION; |
| 156 | // (SSRCCollision will have to take this into account) |
| 157 | pkt->info.SR.ssrc = getLocalSSRCNetwork(); |
| 158 | |
| 159 | // allow to start RTCP service once everything is set up |
| 160 | controlServiceActive = true; |
| 161 | } |
| 162 | |
| 163 | QueueRTCPManager::~QueueRTCPManager() |
| 164 | { |
| 165 | endQueueRTCPManager(); |
| 166 | } |
| 167 | |
| 168 | void QueueRTCPManager::endQueueRTCPManager() |
| 169 | { |
| 170 | controlServiceActive = false; |
| 171 | controlBwFract = sendControlBwFract = 0; |
| 172 | } |
| 173 | |
| 174 | bool QueueRTCPManager::checkSSRCInRTCPPkt(SyncSourceLink& sourceLink, |
| 175 | bool is_new, InetAddress& network_address, tpport_t transport_port) |
| 176 | { |
| 177 | bool result = true; |
| 178 | |
| 179 | // Test if the source is new and it is not the local one. |
| 180 | if ( is_new && sourceLink.getSource()->getID() != getLocalSSRC() ) |
| 181 | return result; |
| 182 | |
| 183 | SyncSource *s = sourceLink.getSource(); |
| 184 | if ( s->getControlTransportPort() != transport_port || |
| 185 | s->getNetworkAddress() != network_address ) { |
| 186 | // SSRC collision or a loop has happened |
| 187 | if ( s->getID() != getLocalSSRC() ) { |
| 188 | // TODO: Optional error counter. |
| 189 | |
| 190 | // Note this differs from the default in the RFC. |
| 191 | // Discard packet only when the collision is |
| 192 | // repeating (to avoid flip-flopping) |
| 193 | if ( sourceLink.getPrevConflict() && |
| 194 | ( |
| 195 | (network_address == |
| 196 | sourceLink.getPrevConflict()->networkAddress) |
| 197 | && |
| 198 | (transport_port == |
| 199 | sourceLink.getPrevConflict()->controlTransportPort) |
| 200 | ) ) { |
| 201 | // discard packet and do not flip-flop |
| 202 | result = false; |
| 203 | } else { |
| 204 | // Record who has collided so that in |
| 205 | // the future we can how if the |
| 206 | // collision repeats. |
| 207 | sourceLink.setPrevConflict(network_address, |
| 208 | 0,transport_port); |
| 209 | // Change sync source transport address |
| 210 | setControlTransportPort(*s,transport_port); |
| 211 | setNetworkAddress(*s,network_address); |
| 212 | } |
| 213 | |
| 214 | } else { |
| 215 | // Collision or loop of own packets. |
| 216 | ConflictingTransportAddress* conflicting = |
| 217 | searchControlConflict(network_address, |
| 218 | transport_port); |
| 219 | if ( conflicting ) { |
| 220 | // Optional error counter. |
| 221 | updateConflict(*conflicting); |
| 222 | result = false; |
| 223 | } else { |
| 224 | // New collision |
| 225 | addConflict(s->getNetworkAddress(), |
| 226 | s->getDataTransportPort(), |
| 227 | s->getControlTransportPort()); |
| 228 | dispatchBYE("SSRC collision detected when receiving RTCP packet"); |
| 229 | renewLocalSSRC(); |
| 230 | setNetworkAddress(*s,network_address); |
| 231 | setControlTransportPort(*s,transport_port); |
| 232 | setControlTransportPort(*s,0); |
| 233 | sourceLink.initStats(); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | return result; |
| 238 | } |
| 239 | |
| 240 | void QueueRTCPManager::controlReceptionService() |
| 241 | { |
| 242 | if ( !controlServiceActive ) |
| 243 | return; |
| 244 | |
| 245 | // A) see if there are incoming RTCP packets |
| 246 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 247 | if ( timercmp(&(reconsInfo.rtcpTc),&rtcpNextCheck,>=) ) { |
| 248 | while ( isPendingControl(0) ) |
| 249 | takeInControlPacket(); |
| 250 | // If this do loops more than once, then we have not |
| 251 | // been in time. So it skips until the next future |
| 252 | // instant. |
| 253 | do { |
| 254 | timeval tmp = rtcpNextCheck; |
| 255 | timeradd(&rtcpLastCheck,&rtcpCheckInterval, |
| 256 | &rtcpNextCheck); |
| 257 | rtcpLastCheck = tmp; |
| 258 | } while ( timercmp(&(reconsInfo.rtcpTc), &(rtcpNextCheck), >=) ); |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | void QueueRTCPManager::controlTransmissionService() |
| 263 | { |
| 264 | if ( !controlServiceActive ) |
| 265 | return; |
| 266 | |
| 267 | // B) send RTCP packets |
| 268 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 269 | if ( timercmp(&(reconsInfo.rtcpTc),&(reconsInfo.rtcpTn),>=) ) { |
| 270 | if ( timerReconsideration() ) { |
| 271 | // this would update to last received RTCP packets |
| 272 | //while ( isPendingControl(0) ) |
| 273 | // takeInControlPacket(); |
| 274 | rtcpLastCheck = reconsInfo.rtcpTc; |
| 275 | dispatchControlPacket(); |
| 276 | if (rtcpInitial) |
| 277 | rtcpInitial = false; |
| 278 | expireSSRCs(); |
| 279 | reconsInfo.rtcpTp = reconsInfo.rtcpTc; |
| 280 | // we have updated tp and sent a report, so we |
| 281 | // have to recalculate the sending interval |
| 282 | timeval T = computeRTCPInterval(); |
| 283 | timeradd(&(reconsInfo.rtcpTc),&T,&(reconsInfo.rtcpTn)); |
| 284 | |
| 285 | // record current number of members for the |
| 286 | // next check. |
| 287 | reconsInfo.rtcpPMembers = getMembersCount(); |
| 288 | } |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | bool QueueRTCPManager::timerReconsideration() |
| 293 | { |
| 294 | bool result = false; |
| 295 | // compute again the interval to confirm it under current |
| 296 | // circumstances |
| 297 | timeval T = computeRTCPInterval(); |
| 298 | timeradd(&(reconsInfo.rtcpTp),&T,&(reconsInfo.rtcpTn)); |
| 299 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 300 | if ( timercmp(&(reconsInfo.rtcpTc),&(reconsInfo.rtcpTn),>=) ) { |
| 301 | reconsInfo.rtcpTp = reconsInfo.rtcpTc; |
| 302 | result = true; |
| 303 | } |
| 304 | return result; |
| 305 | } |
| 306 | |
| 307 | void |
| 308 | QueueRTCPManager::expireSSRCs() |
| 309 | {} |
| 310 | |
| 311 | void |
| 312 | QueueRTCPManager::takeInControlPacket() |
| 313 | { |
| 314 | size_t len = 0; |
| 315 | InetHostAddress network_address; |
| 316 | tpport_t transport_port; |
| 317 | len = recvControl(rtcpRecvBuffer,getPathMTU(),network_address, transport_port); |
| 318 | |
| 319 | // get time of arrival |
| 320 | struct timeval recvtime; |
| 321 | gettimeofday(&recvtime,NULL); |
| 322 | |
| 323 | // process a 'len' octets long RTCP compound packet |
| 324 | |
| 325 | // Check validity of the header fields of the compound packet |
| 326 | if ( !RTCPCompoundHandler::checkCompoundRTCPHeader(len) ) |
| 327 | return; |
| 328 | |
| 329 | RTCPPacket *pkt = reinterpret_cast<RTCPPacket *>(rtcpRecvBuffer); |
| 330 | |
| 331 | // TODO: for now, we do nothing with the padding bit |
| 332 | // in the header. |
| 333 | |
| 334 | bool source_created; |
| 335 | SyncSourceLink* sourceLink = getSourceBySSRC(pkt->getSSRC(),source_created); |
| 336 | SyncSource* s = sourceLink->getSource(); |
| 337 | |
| 338 | if ( source_created ) { |
| 339 | // Set control transport address. |
| 340 | setControlTransportPort(*s,transport_port); |
| 341 | // Network address is assumed to be the same as the control one |
| 342 | setNetworkAddress(*s,network_address); |
| 343 | sourceLink->initStats(); |
| 344 | sourceLink->setProbation(getMinValidPacketSequence()); |
| 345 | if ( sourceLink->getHello() ) |
| 346 | onNewSyncSource(*s); |
| 347 | } else if ( s->getControlTransportPort() == 0 ) { |
| 348 | // Test if RTP data packets had been received but this |
| 349 | // is the first control packet from this source. |
| 350 | setControlTransportPort(*s,transport_port); |
| 351 | } |
| 352 | // record reception time |
| 353 | sourceLink->lastRTCPPacketTime = recvtime; |
| 354 | sourceLink->lastRTCPSRTime = recvtime; |
| 355 | |
| 356 | size_t pointer = 0; |
| 357 | // Check the first packet is a report and do special |
| 358 | // processing for SR reports. |
| 359 | if ( RTCPPacket::tRR == pkt->fh.type ) { |
| 360 | // no special initialization is required for |
| 361 | // RR reports, all reports will be processed |
| 362 | // in the do-while down here. |
| 363 | } else if ( RTCPPacket::tSR == pkt->fh.type ){ |
| 364 | if ( checkSSRCInRTCPPkt(*sourceLink,source_created, |
| 365 | network_address, |
| 366 | transport_port) ) |
| 367 | sourceLink->lastRTCPSRTime = recvtime; |
| 368 | onGotSR(*s,pkt->info.SR,pkt->fh.block_count); |
| 369 | // Advance to the next packet in the compound. |
| 370 | pointer += pkt->getLength(); |
| 371 | pkt = reinterpret_cast<RTCPPacket *>(rtcpRecvBuffer +pointer); |
| 372 | } else if ( RTCPPacket::tXR == pkt->fh.type ) { |
| 373 | // TODO: handle XR reports. |
| 374 | } else { |
| 375 | // Ignore RTCP types unknown. |
| 376 | } |
| 377 | |
| 378 | // Process all RR reports. |
| 379 | while ( (pointer < len) && (RTCPPacket::tRR == pkt->fh.type) ) { |
| 380 | sourceLink = getSourceBySSRC(pkt->getSSRC(), |
| 381 | source_created); |
| 382 | if ( checkSSRCInRTCPPkt(*sourceLink,source_created, |
| 383 | network_address,transport_port) ) |
| 384 | onGotRR(*s,pkt->info.RR,pkt->fh.block_count); |
| 385 | // Advance to the next packet in the compound |
| 386 | pointer += pkt->getLength(); |
| 387 | pkt = reinterpret_cast<RTCPPacket *>(rtcpRecvBuffer +pointer); |
| 388 | } |
| 389 | |
| 390 | // SDES, APP and BYE. process first everything but the |
| 391 | // BYE packets. |
| 392 | bool cname_found = false; |
| 393 | while ( (pointer < len ) && |
| 394 | (pkt->fh.type == RTCPPacket::tSDES || |
| 395 | pkt->fh.type == RTCPPacket::tAPP) ) { |
| 396 | I ( cname_found || !pkt->fh.padding ); |
| 397 | sourceLink = getSourceBySSRC(pkt->getSSRC(), |
| 398 | source_created); |
| 399 | if ( checkSSRCInRTCPPkt(*sourceLink,source_created, |
| 400 | network_address, |
| 401 | transport_port) ) { |
| 402 | if ( pkt->fh.type == RTCPPacket::tSDES ) { |
| 403 | bool cname = onGotSDES(*s,*pkt); |
| 404 | cname_found = cname_found? cname_found : cname; |
| 405 | } else if ( pkt->fh.type == RTCPPacket::tAPP ) { |
| 406 | onGotAPP(*s,pkt->info.APP,pkt->getLength()); |
| 407 | // pointer += pkt->getLength(); |
| 408 | } else { |
| 409 | // error? |
| 410 | } |
| 411 | } |
| 412 | // Get the next packet in the compound. |
| 413 | pointer += pkt->getLength(); |
| 414 | pkt = reinterpret_cast<RTCPPacket *>(rtcpRecvBuffer +pointer); |
| 415 | } |
| 416 | |
| 417 | // TODO: error? if !cname_found |
| 418 | |
| 419 | // process BYE packets |
| 420 | while ( pointer < len ) { |
| 421 | if ( pkt->fh.type == RTCPPacket::tBYE ) { |
| 422 | sourceLink = getSourceBySSRC(pkt->getSSRC(), |
| 423 | source_created); |
| 424 | if ( checkSSRCInRTCPPkt(*sourceLink,source_created, |
| 425 | network_address, |
| 426 | transport_port) ) |
| 427 | getBYE(*pkt,pointer,len); |
| 428 | } else if ( pkt->fh.type != RTCPPacket::tBYE ) { |
| 429 | break; // TODO: check non-BYE out of place. |
| 430 | } else { |
| 431 | break; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | // Call plug-in in case there are profile extensions |
| 436 | // at the end of the SR/RR. |
| 437 | if ( pointer != len ) { |
| 438 | onGotRRSRExtension(rtcpRecvBuffer + pointer, |
| 439 | len - pointer); |
| 440 | } |
| 441 | |
| 442 | // Everything went right, update the RTCP average size |
| 443 | updateAvgRTCPSize(len); |
| 444 | } |
| 445 | |
| 446 | bool QueueRTCPManager::end2EndDelayed(IncomingRTPPktLink& pl) |
| 447 | { |
| 448 | bool result = false; |
| 449 | |
| 450 | if ( 0 != getEnd2EndDelay() ) { |
| 451 | SyncSourceLink* sl = pl.getSourceLink(); |
| 452 | void* si = sl->getSenderInfo(); |
| 453 | if ( NULL != si ) { |
| 454 | RTCPSenderInfo rsi(si); |
| 455 | uint32 tsInc = pl.getPacket()->getTimestamp() - |
| 456 | rsi.getRTPTimestamp(); |
| 457 | // approx. |
| 458 | microtimeout_t Inc = tsInc * 1000 / |
| 459 | (getCurrentRTPClockRate() / 1000); |
| 460 | timeval timevalInc = microtimeout2Timeval(Inc); |
| 461 | |
| 462 | timeval tNTP = NTP2Timeval(rsi.getNTPTimestampInt(), |
| 463 | rsi.getNTPTimestampFrac()); |
| 464 | timeval packetTime; |
| 465 | timeradd(&tNTP,&timevalInc,&packetTime); |
| 466 | timeval now, diff; |
| 467 | gettimeofday(&now,NULL); |
| 468 | timersub(&now,&packetTime,&diff); |
| 469 | |
| 470 | if ( timeval2microtimeout(diff) > getEnd2EndDelay() ) |
| 471 | result = true; |
| 472 | } |
| 473 | } |
| 474 | return result; |
| 475 | } |
| 476 | |
| 477 | void QueueRTCPManager::onGotSR(SyncSource& source, SendReport& SR, uint8) |
| 478 | { |
| 479 | // We ignore the receiver blocks and just get the sender info |
| 480 | // at the beginning of the SR. |
| 481 | getLink(source)->setSenderInfo(reinterpret_cast<unsigned char*>(&(SR.sinfo))); |
| 482 | } |
| 483 | |
| 484 | void QueueRTCPManager::onGotRR(SyncSource& source, RecvReport& RR, uint8 blocks) |
| 485 | { |
| 486 | for ( uint8 i = 0; i < blocks; i++) { |
| 487 | // this generic RTCP manager ignores reports about |
| 488 | // other sources than the local one |
| 489 | if ( getLocalSSRCNetwork() == RR.ssrc ) { |
| 490 | getLink(source)-> |
| 491 | setReceiverInfo |
| 492 | (reinterpret_cast<unsigned char*>(&(RR.blocks[i].rinfo))); |
| 493 | } |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | void QueueRTCPManager::updateAvgRTCPSize(size_t len) |
| 498 | { |
| 499 | size_t newlen = len; |
| 500 | newlen += lowerHeadersSize; |
| 501 | rtcpAvgSize = (uint16)(( (15 * rtcpAvgSize) >> 4 ) + ( newlen >> 4)); |
| 502 | } |
| 503 | |
| 504 | bool QueueRTCPManager::getBYE(RTCPPacket& pkt, size_t& pointer, size_t) |
| 505 | { |
| 506 | if ( 0 == pkt.fh.block_count ) |
| 507 | return false; |
| 508 | |
| 509 | char *reason = NULL; |
| 510 | |
| 511 | if ( (sizeof(RTCPFixedHeader) + pkt.fh.block_count * sizeof(uint32)) |
| 512 | < pkt.getLength() ) { |
| 513 | uint16 endpointer = (uint16)(pointer + sizeof(RTCPFixedHeader) + |
| 514 | pkt.fh.block_count * sizeof(uint32)); |
| 515 | uint16 len = rtcpRecvBuffer[endpointer]; |
| 516 | reason = new char[len + 1]; |
| 517 | memcpy(reason,rtcpRecvBuffer + endpointer + 1,len); |
| 518 | reason[len] = '\0'; |
| 519 | } else { // avoid dangerous conversion of NULL to a C++ string. |
| 520 | reason = new char[1]; |
| 521 | reason[0] = '\0'; |
| 522 | } |
| 523 | |
| 524 | int i = 0; |
| 525 | while ( i < pkt.fh.block_count ) { |
| 526 | bool created; |
| 527 | SyncSourceLink* srcLink = |
| 528 | getSourceBySSRC(pkt.getSSRC(),created); |
| 529 | i++; |
| 530 | if( srcLink->getGoodbye() ) |
| 531 | onGotGoodbye(*(srcLink->getSource()),reason); |
| 532 | BYESource(pkt.getSSRC()); |
| 533 | setState(*(srcLink->getSource()),SyncSource::stateLeaving); |
| 534 | |
| 535 | reverseReconsideration(); |
| 536 | } |
| 537 | |
| 538 | delete [] reason; |
| 539 | pointer += pkt.getLength(); |
| 540 | return true; |
| 541 | } |
| 542 | |
| 543 | void QueueRTCPManager::reverseReconsideration() |
| 544 | { |
| 545 | if ( getMembersCount() < reconsInfo.rtcpPMembers ) { |
| 546 | timeval inc; |
| 547 | |
| 548 | // reconsider reconsInfo.rtcpTn (time for next RTCP packet) |
| 549 | microtimeout_t t = |
| 550 | (reconsInfo.rtcpTn.tv_sec - reconsInfo.rtcpTc.tv_sec) * |
| 551 | 1000000 + |
| 552 | (reconsInfo.rtcpTn.tv_usec - reconsInfo.rtcpTc.tv_usec); |
| 553 | t *= getMembersCount(); |
| 554 | t /= reconsInfo.rtcpPMembers; |
| 555 | inc.tv_usec = t % 1000000; |
| 556 | inc.tv_sec = t / 1000000; |
| 557 | timeradd(&(reconsInfo.rtcpTc),&inc,&(reconsInfo.rtcpTn)); |
| 558 | |
| 559 | // reconsider tp (time for previous RTCP packet) |
| 560 | t = (reconsInfo.rtcpTc.tv_sec - reconsInfo.rtcpTp.tv_sec) * |
| 561 | 1000000 + |
| 562 | (reconsInfo.rtcpTc.tv_usec - reconsInfo.rtcpTp.tv_usec); |
| 563 | t *= getMembersCount(); |
| 564 | t /= reconsInfo.rtcpPMembers; |
| 565 | inc.tv_usec = t % 1000000; |
| 566 | inc.tv_sec = t / 1000000; |
| 567 | timeradd(&(reconsInfo.rtcpTc),&inc,&(reconsInfo.rtcpTp)); |
| 568 | } |
| 569 | reconsInfo.rtcpPMembers = getMembersCount(); |
| 570 | } |
| 571 | |
| 572 | bool QueueRTCPManager::onGotSDES(SyncSource& source, RTCPPacket& pkt) |
| 573 | { |
| 574 | // Take into account that length fields in SDES items are |
| 575 | // 8-bit long, so no ntoh[s|l] is required |
| 576 | bool cname_found = false; |
| 577 | |
| 578 | ptrdiff_t pointer = reinterpret_cast<unsigned char*>(&pkt) - rtcpRecvBuffer; |
| 579 | uint16 i = 0; |
| 580 | do { |
| 581 | size_t len = pkt.getLength(); |
| 582 | pointer += sizeof(RTCPFixedHeader); |
| 583 | SDESChunk* chunk = (SDESChunk*)(rtcpRecvBuffer + pointer); |
| 584 | |
| 585 | bool source_created = false; |
| 586 | // TODO: avoid searching again the source of the first chunk. |
| 587 | SyncSourceLink* sourceLink = |
| 588 | getSourceBySSRC(chunk->getSSRC(), |
| 589 | source_created); |
| 590 | // TODO: check that there are no two chunks with the |
| 591 | // same SSRC but different CNAME |
| 592 | SyncSource& src = *( sourceLink->getSource() ); |
| 593 | |
| 594 | if ( onGotSDESChunk(source,*chunk,len) ) |
| 595 | cname_found = true; |
| 596 | pointer +=len; |
| 597 | if( sourceLink->getHello() ) |
| 598 | onNewSyncSource(src); |
| 599 | i++; |
| 600 | } while ( i < pkt.fh.block_count ); |
| 601 | return cname_found; |
| 602 | } |
| 603 | |
| 604 | bool QueueRTCPManager::onGotSDESChunk(SyncSource& source, SDESChunk& chunk, size_t len) |
| 605 | { |
| 606 | bool cname_found = false; |
| 607 | bool end = false; |
| 608 | |
| 609 | SyncSourceLink* srcLink = getLink(source); |
| 610 | Participant* part = source.getParticipant(); |
| 611 | |
| 612 | size_t pointer = sizeof(chunk.ssrc); |
| 613 | |
| 614 | // process chunk items |
| 615 | while ( (pointer < len) && !end ) { |
| 616 | SDESItem* item = |
| 617 | reinterpret_cast<SDESItem*>(size_t(&(chunk)) + pointer); |
| 618 | if ( item->type > SDESItemTypeEND && item->type <= SDESItemTypeLast) { |
| 619 | pointer += sizeof(item->type) + sizeof(item->len) + |
| 620 | item->len; |
| 621 | if ( NULL == part && SDESItemTypeCNAME == item->type ) { |
| 622 | const RTPApplication& app = getApplication(); |
| 623 | std::string cname = std::string(item->data,item->len); |
| 624 | const Participant* p = app.getParticipant(cname); |
| 625 | if ( p ) { |
| 626 | part = const_cast<Participant*>(p); |
| 627 | setParticipant(*(srcLink->getSource()),*part); |
| 628 | } else { |
| 629 | part = new Participant("-"); |
| 630 | addParticipant(const_cast<RTPApplication&>(getApplication()),*part); |
| 631 | } |
| 632 | setParticipant(*(srcLink->getSource()),*part); |
| 633 | } |
| 634 | |
| 635 | // support for CNAME updates |
| 636 | if ( part ) |
| 637 | setSDESItem(part,(SDESItemType)item->type, item->data,item->len); |
| 638 | |
| 639 | if ( item->type == SDESItemTypeCNAME) { |
| 640 | cname_found = true; |
| 641 | // note that CNAME must be send in |
| 642 | // every RTCP compound, so we only |
| 643 | // trust sources that include it. |
| 644 | setState(*(srcLink->getSource()), |
| 645 | SyncSource::stateActive); |
| 646 | } |
| 647 | } else if ( item->type == SDESItemTypeEND) { |
| 648 | end = true; |
| 649 | pointer++; |
| 650 | pointer += (pointer & 0x03); // padding |
| 651 | } else if ( item->type == SDESItemTypePRIV ) { |
| 652 | ptrdiff_t prevpointer = pointer; |
| 653 | uint8 plength = *( &(item->len) + 1 ); |
| 654 | pointer += sizeof(item->type) + sizeof(item->len) + 1; |
| 655 | |
| 656 | if ( part ) |
| 657 | setSDESItem(part,SDESItemTypePRIV, |
| 658 | reinterpret_cast<char*>(item + pointer),plength); |
| 659 | pointer += plength; |
| 660 | setPRIVPrefix(part, |
| 661 | reinterpret_cast<char*>(item + pointer), |
| 662 | (item->len - 1 - plength)); |
| 663 | pointer = prevpointer + item->len; |
| 664 | } else { |
| 665 | pointer++; |
| 666 | // TODO: error: SDES unknown |
| 667 | I( false ); |
| 668 | } |
| 669 | } |
| 670 | return cname_found; |
| 671 | } |
| 672 | |
| 673 | timeval QueueRTCPManager::computeRTCPInterval() |
| 674 | { |
| 675 | float bwfract = controlBwFract * getSessionBandwidth(); |
| 676 | uint32 participants = getMembersCount(); |
| 677 | if ( getSendersCount() > 0 && |
| 678 | ( getSendersCount() < (getMembersCount() * sendControlBwFract) )) { |
| 679 | // reserve "sendControlBwFract" fraction of the total |
| 680 | // RTCP bandwith for senders. |
| 681 | if (rtcpWeSent) { |
| 682 | // we take the side of active senders |
| 683 | bwfract *= sendControlBwFract; |
| 684 | participants = getSendersCount(); |
| 685 | } else { |
| 686 | // we take the side of passive receivers |
| 687 | bwfract *= recvControlBwFract; |
| 688 | participants = getMembersCount() - getSendersCount(); |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | microtimeout_t min_interval = rtcpMinInterval; |
| 693 | // be a bit quicker at first |
| 694 | if ( rtcpInitial ) |
| 695 | min_interval /= 2; |
| 696 | // this is the real computation: |
| 697 | microtimeout_t interval = 0; |
| 698 | if ( bwfract != 0 ) { |
| 699 | interval = static_cast<microtimeout_t> |
| 700 | ((participants * rtcpAvgSize / bwfract) * 1000000); |
| 701 | |
| 702 | if ( interval < rtcpMinInterval ) |
| 703 | interval = rtcpMinInterval; |
| 704 | } else { |
| 705 | // 100 seconds instead of infinite |
| 706 | interval = 100000000; |
| 707 | } |
| 708 | |
| 709 | interval = static_cast<microtimeout_t>(interval * ( 0.5 + |
| 710 | (rand() / (RAND_MAX + 1.0)))); |
| 711 | |
| 712 | timeval result; |
| 713 | result.tv_sec = interval / 1000000; |
| 714 | result.tv_usec = interval % 1000000; |
| 715 | return result; |
| 716 | } |
| 717 | |
| 718 | size_t QueueRTCPManager::dispatchBYE(const std::string& reason) |
| 719 | { |
| 720 | // for this method, see section 6.3.7 in RFC 3550 |
| 721 | // never send a BYE packet if never sent an RTP or RTCP packet |
| 722 | // before |
| 723 | if ( !(getSendPacketCount() || getSendRTCPPacketCount()) ) |
| 724 | return 0; |
| 725 | |
| 726 | if ( getMembersCount() > 50) { |
| 727 | // Usurp the scheduler role and apply a back-off |
| 728 | // algorithm to avoid BYE floods. |
| 729 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 730 | reconsInfo.rtcpTp = reconsInfo.rtcpTc; |
| 731 | setMembersCount(1); |
| 732 | setPrevMembersNum(1); |
| 733 | rtcpInitial = true; |
| 734 | rtcpWeSent = false; |
| 735 | rtcpAvgSize = (uint16)(sizeof(RTCPFixedHeader) + sizeof(uint32) + |
| 736 | strlen(reason.c_str()) + |
| 737 | (4 - (strlen(reason.c_str()) & 0x03))); |
| 738 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 739 | timeval T = computeRTCPInterval(); |
| 740 | timeradd(&(reconsInfo.rtcpTp),&T,&(reconsInfo.rtcpTn)); |
| 741 | while ( timercmp(&(reconsInfo.rtcpTc),&(reconsInfo.rtcpTn),<) ) { |
| 742 | getOnlyBye(); |
| 743 | if ( timerReconsideration() ) |
| 744 | break; |
| 745 | gettimeofday(&(reconsInfo.rtcpTc),NULL); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | |
| 750 | unsigned char buffer[500]; |
| 751 | // Build an empty RR as first packet in the compound. |
| 752 | // TODO: provide more information if available. Not really |
| 753 | // important, since this is the last packet being sent. |
| 754 | RTCPPacket* pkt = reinterpret_cast<RTCPPacket*>(buffer); |
| 755 | pkt->fh.version = CCRTP_VERSION; |
| 756 | pkt->fh.padding = 0; |
| 757 | pkt->fh.block_count = 0; |
| 758 | pkt->fh.type = RTCPPacket::tRR; |
| 759 | pkt->info.RR.ssrc= getLocalSSRCNetwork(); |
| 760 | uint16 len1 = sizeof(RTCPFixedHeader) + sizeof(uint32); // 1st pkt len. |
| 761 | pkt->fh.length = htons((len1 >> 2) - 1); |
| 762 | uint16 len = len1; // whole compound len. |
| 763 | // build a BYE packet |
| 764 | uint16 padlen = 0; |
| 765 | pkt = reinterpret_cast<RTCPPacket*>(buffer + len1); |
| 766 | pkt->fh.version = CCRTP_VERSION; |
| 767 | pkt->fh.block_count = 1; |
| 768 | pkt->fh.type = RTCPPacket::tBYE; |
| 769 | // add the SSRC identifier |
| 770 | pkt->info.BYE.ssrc = getLocalSSRCNetwork(); |
| 771 | len += sizeof(RTCPFixedHeader) + sizeof(BYEPacket); |
| 772 | // add the optional reason |
| 773 | if ( reason.c_str() != NULL ){ |
| 774 | pkt->info.BYE.length = (uint8)strlen(reason.c_str()); |
| 775 | memcpy(buffer + len,reason.c_str(),pkt->info.BYE.length); |
| 776 | len += pkt->info.BYE.length; |
| 777 | padlen = 4 - ((len - len1) & 0x03); |
| 778 | if ( padlen ) { |
| 779 | memset(buffer + len,0,padlen); |
| 780 | len += padlen; |
| 781 | pkt->info.BYE.length += padlen; |
| 782 | } |
| 783 | } |
| 784 | pkt->fh.length = htons(((len - len1) >> 2) - 1); |
| 785 | |
| 786 | return sendControlToDestinations(buffer,len); |
| 787 | } |
| 788 | |
| 789 | void QueueRTCPManager::getOnlyBye() |
| 790 | { |
| 791 | // This method is kind of simplified recvControl |
| 792 | timeval wait; |
| 793 | timersub(&(reconsInfo.rtcpTn),&(reconsInfo.rtcpTc),&wait); |
| 794 | microtimeout_t timer = wait.tv_usec/1000 + wait.tv_sec * 1000; |
| 795 | // wait up to reconsInfo.rtcpTn |
| 796 | if ( !isPendingControl(timer) ) |
| 797 | return; |
| 798 | |
| 799 | size_t len = 0; |
| 800 | InetHostAddress network_address; |
| 801 | tpport_t transport_port; |
| 802 | while ( (len = recvControl(rtcpRecvBuffer,getPathMTU(), |
| 803 | network_address,transport_port)) ) { |
| 804 | // Process a <code>len<code> octets long RTCP compound packet |
| 805 | // Check validity of the header fields of the compound packet |
| 806 | if ( !RTCPCompoundHandler::checkCompoundRTCPHeader(len) ) |
| 807 | return; |
| 808 | |
| 809 | // TODO: For now, we do nothing with the padding bit |
| 810 | // in the header. |
| 811 | uint32 pointer = 0; |
| 812 | RTCPPacket* pkt; |
| 813 | while ( pointer < len) { |
| 814 | pkt = reinterpret_cast<RTCPPacket*> |
| 815 | (rtcpRecvBuffer + pointer); |
| 816 | |
| 817 | if (pkt->fh.type == RTCPPacket::tBYE ) { |
| 818 | bool created; |
| 819 | SyncSourceLink* srcLink = |
| 820 | getSourceBySSRC(pkt->getSSRC(), |
| 821 | created); |
| 822 | if( srcLink->getGoodbye() ) |
| 823 | onGotGoodbye(*(srcLink->getSource()), ""); |
| 824 | BYESource(pkt->getSSRC()); |
| 825 | } |
| 826 | pointer += pkt->getLength(); |
| 827 | } |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | size_t QueueRTCPManager::dispatchControlPacket(void) |
| 832 | { |
| 833 | rtcpInitial = false; |
| 834 | // Keep in mind: always include a report (in SR or RR) and at |
| 835 | // least a SDES with the local CNAME. It is mandatory. |
| 836 | |
| 837 | // (A) SR or RR, depending on whether we sent. |
| 838 | // pkt will point to the packets of the compound |
| 839 | |
| 840 | RTCPPacket* pkt = reinterpret_cast<RTCPPacket*>(rtcpSendBuffer); |
| 841 | // Fixed header of the first report |
| 842 | pkt->fh.padding = 0; |
| 843 | pkt->fh.version = CCRTP_VERSION; |
| 844 | // length of the RTCP compound packet. It will increase till |
| 845 | // the end of this routine. Both sender and receiver report |
| 846 | // carry the general 32-bit long fixed header and a 32-bit |
| 847 | // long SSRC identifier. |
| 848 | uint16 len = sizeof(RTCPFixedHeader) + sizeof(uint32); |
| 849 | |
| 850 | // the fields block_count and length will be filled in later |
| 851 | // now decide whether to send a SR or a SR |
| 852 | if ( lastSendPacketCount != getSendPacketCount() ) { |
| 853 | // we have sent rtp packets since last RTCP -> send SR |
| 854 | lastSendPacketCount = getSendPacketCount(); |
| 855 | pkt->fh.type = RTCPPacket::tSR; |
| 856 | pkt->info.SR.ssrc = getLocalSSRCNetwork(); |
| 857 | |
| 858 | // Fill in sender info block. It would be more |
| 859 | // accurate if this were done as late as possible. |
| 860 | timeval now; |
| 861 | gettimeofday(&now,NULL); |
| 862 | // NTP MSB and MSB: dependent on current payload type. |
| 863 | pkt->info.SR.sinfo.NTPMSW = htonl(now.tv_sec + NTP_EPOCH_OFFSET); |
| 864 | pkt->info.SR.sinfo.NTPLSW = htonl((uint32)(((double)(now.tv_usec)*(uint32)(~0))/1000000.0)); |
| 865 | // RTP timestamp |
| 866 | int32 tstamp = now.tv_usec - getInitialTime().tv_usec; |
| 867 | tstamp *= (getCurrentRTPClockRate()/1000); |
| 868 | tstamp /= 1000; |
| 869 | tstamp += (now.tv_sec - getInitialTime().tv_sec) * |
| 870 | getCurrentRTPClockRate(); |
| 871 | tstamp += getInitialTimestamp(); |
| 872 | pkt->info.SR.sinfo.RTPTimestamp = htonl(tstamp); |
| 873 | // sender's packet and octet count |
| 874 | pkt->info.SR.sinfo.packetCount = htonl(getSendPacketCount()); |
| 875 | pkt->info.SR.sinfo.octetCount = htonl(getSendOctetCount()); |
| 876 | len += sizeof(SenderInfo); |
| 877 | } else { |
| 878 | // RR |
| 879 | pkt->fh.type = RTCPPacket::tRR; |
| 880 | pkt->info.RR.ssrc = getLocalSSRCNetwork(); |
| 881 | } |
| 882 | |
| 883 | // (B) put report blocks |
| 884 | // After adding report blocks, we have to leave room for at |
| 885 | // least a CNAME SDES item |
| 886 | uint16 available = (uint16)(getPathMTU() |
| 887 | - lowerHeadersSize |
| 888 | - len |
| 889 | - (sizeof(RTCPFixedHeader) + |
| 890 | 2*sizeof(uint8) + |
| 891 | getApplication().getSDESItem(SDESItemTypeCNAME).length()) |
| 892 | - 100); |
| 893 | |
| 894 | // if we have to go to a new RR packet |
| 895 | bool another = false; |
| 896 | uint16 prevlen = 0; |
| 897 | RRBlock* reports; |
| 898 | if ( RTCPPacket::tRR == pkt->fh.type ) |
| 899 | reports = pkt->info.RR.blocks; |
| 900 | else // ( RTCPPacket::tSR == pkt->fh.type ) |
| 901 | reports = pkt->info.SR.blocks; |
| 902 | do { |
| 903 | uint8 blocks = 0; |
| 904 | pkt->fh.block_count = blocks = packReportBlocks(reports,len,available); |
| 905 | // the length field specifies 32-bit words |
| 906 | pkt->fh.length = htons( ((len - prevlen) >> 2) - 1); |
| 907 | prevlen = len; |
| 908 | if ( 31 == blocks ) { |
| 909 | // we would need room for a new RR packet and |
| 910 | // a CNAME SDES |
| 911 | if ( len < (available - |
| 912 | ( sizeof(RTCPFixedHeader) + sizeof(uint32) + |
| 913 | sizeof(RRBlock))) ) { |
| 914 | another = true; |
| 915 | // Header for this new packet in the compound |
| 916 | pkt = reinterpret_cast<RTCPPacket*> |
| 917 | (rtcpSendBuffer + len); |
| 918 | pkt->fh.version = CCRTP_VERSION; |
| 919 | pkt->fh.padding = 0; |
| 920 | pkt->fh.type = RTCPPacket::tRR; |
| 921 | pkt->info.RR.ssrc = getLocalSSRCNetwork(); |
| 922 | // appended a new Header and a report block |
| 923 | |
| 924 | len += sizeof(RTCPFixedHeader)+ sizeof(uint32); |
| 925 | reports = pkt->info.RR.blocks; |
| 926 | } else { |
| 927 | another = false; |
| 928 | } |
| 929 | } else { |
| 930 | another = false; |
| 931 | } |
| 932 | } while ( (len < available) && another ); |
| 933 | |
| 934 | // (C) SDES (CNAME) |
| 935 | // each SDES chunk must be 32-bit multiple long |
| 936 | // fill the padding with 0s |
| 937 | packSDES(len); |
| 938 | |
| 939 | // TODO: virtual for sending APP RTCP packets? |
| 940 | |
| 941 | // actually send the packet. |
| 942 | size_t count = sendControlToDestinations(rtcpSendBuffer,len); |
| 943 | ctrlSendCount++; |
| 944 | // Everything went right, update the RTCP average size |
| 945 | updateAvgRTCPSize(len); |
| 946 | |
| 947 | return count; |
| 948 | } |
| 949 | |
| 950 | void QueueRTCPManager::packSDES(uint16 &len) |
| 951 | { |
| 952 | uint16 prevlen = len; |
| 953 | RTCPPacket* pkt = reinterpret_cast<RTCPPacket*>(rtcpSendBuffer + len); |
| 954 | // Fill RTCP fixed header. Note fh.length is not set till the |
| 955 | // end of this routine. |
| 956 | pkt->fh.version = CCRTP_VERSION; |
| 957 | pkt->fh.padding = 0; |
| 958 | pkt->fh.block_count = 1; |
| 959 | pkt->fh.type = RTCPPacket::tSDES; |
| 960 | pkt->info.SDES.ssrc = getLocalSSRCNetwork(); |
| 961 | pkt->info.SDES.item.type = SDESItemTypeCNAME; |
| 962 | // put CNAME |
| 963 | size_t cnameLen = |
| 964 | getApplication().getSDESItem(SDESItemTypeCNAME).length(); |
| 965 | const char* cname = |
| 966 | getApplication().getSDESItem(SDESItemTypeCNAME).c_str(); |
| 967 | pkt->info.SDES.item.len = (uint8)cnameLen; |
| 968 | len += sizeof(RTCPFixedHeader) + sizeof(pkt->info.SDES.ssrc) + |
| 969 | sizeof(pkt->info.SDES.item.type) + |
| 970 | sizeof(pkt->info.SDES.item.len); |
| 971 | |
| 972 | memcpy((rtcpSendBuffer + len),cname,cnameLen); |
| 973 | len += (uint16)cnameLen; |
| 974 | // pack items other than CNAME (following priorities |
| 975 | // stablished inside scheduleSDESItem()). |
| 976 | SDESItemType nexttype = scheduleSDESItem(); |
| 977 | if ( (nexttype > SDESItemTypeCNAME) && |
| 978 | (nexttype <= SDESItemTypeLast ) ) { |
| 979 | SDESItem *item = reinterpret_cast<SDESItem *>(rtcpSendBuffer + len); |
| 980 | item->type = nexttype; |
| 981 | const char *content = |
| 982 | getApplication().getSDESItem(nexttype).c_str(); |
| 983 | item->len = (uint8)strlen(content); |
| 984 | len += 2; |
| 985 | memcpy(reinterpret_cast<char *>(rtcpSendBuffer + len), |
| 986 | content,item->len); |
| 987 | len += item->len; |
| 988 | } |
| 989 | |
| 990 | // pack END item (terminate list of items in this chunk) |
| 991 | rtcpSendBuffer[len] = SDESItemTypeEND; |
| 992 | len++; |
| 993 | |
| 994 | uint8 padding = len & 0x03; |
| 995 | if ( padding ) { |
| 996 | padding = 4 - padding; |
| 997 | memset((rtcpSendBuffer + len),SDESItemTypeEND,padding); |
| 998 | len += padding; |
| 999 | } |
| 1000 | pkt->fh.length = htons((len - prevlen - 1) >>2); |
| 1001 | } |
| 1002 | |
| 1003 | uint8 QueueRTCPManager::packReportBlocks(RRBlock* blocks, uint16 &len, uint16& available) |
| 1004 | { |
| 1005 | uint8 j = 0; |
| 1006 | // pack as many report blocks as we can |
| 1007 | SyncSourceLink* i = getFirst(); |
| 1008 | for ( ; |
| 1009 | ( ( i != NULL ) && |
| 1010 | ( len < (available - sizeof(RTCPCompoundHandler::RRBlock)) ) && |
| 1011 | ( j < 31 ) ); |
| 1012 | i = i->getNext() ) { |
| 1013 | SyncSourceLink& srcLink = *i; |
| 1014 | // update stats. |
| 1015 | srcLink.computeStats(); |
| 1016 | blocks[j].ssrc = htonl(srcLink.getSource()->getID()); |
| 1017 | blocks[j].rinfo.fractionLost = srcLink.getFractionLost(); |
| 1018 | blocks[j].rinfo.lostMSB = |
| 1019 | (srcLink.getCumulativePacketLost() & 0xFF0000) >> 16; |
| 1020 | blocks[j].rinfo.lostLSW = |
| 1021 | htons(srcLink.getCumulativePacketLost() & 0xFFFF); |
| 1022 | blocks[j].rinfo.highestSeqNum = |
| 1023 | htonl(srcLink.getExtendedMaxSeqNum()); |
| 1024 | blocks[j].rinfo.jitter = |
| 1025 | htonl(static_cast<uint32>(srcLink.getJitter())); |
| 1026 | RTCPCompoundHandler::SenderInfo* si = |
| 1027 | reinterpret_cast<RTCPCompoundHandler::SenderInfo*>(srcLink.getSenderInfo()); |
| 1028 | if ( NULL == si ) { |
| 1029 | blocks[j].rinfo.lsr = 0; |
| 1030 | blocks[j].rinfo.dlsr = 0; |
| 1031 | } else { |
| 1032 | blocks[j].rinfo.lsr = |
| 1033 | htonl( ((ntohl(si->NTPMSW) & 0x0FFFF) << 16 )+ |
| 1034 | ((ntohl(si->NTPLSW) & 0xFFFF0000) >> 16) |
| 1035 | ); |
| 1036 | timeval now, diff; |
| 1037 | gettimeofday(&now,NULL); |
| 1038 | timeval last = srcLink.getLastRTCPSRTime(); |
| 1039 | timersub(&now,&last,&diff); |
| 1040 | blocks[j].rinfo.dlsr = |
| 1041 | htonl(timevalIntervalTo65536(diff)); |
| 1042 | } |
| 1043 | len += sizeof(RTCPCompoundHandler::RRBlock); |
| 1044 | j++; |
| 1045 | } |
| 1046 | return j; |
| 1047 | } |
| 1048 | |
| 1049 | void QueueRTCPManager::setSDESItem(Participant* part, SDESItemType type, |
| 1050 | const char* const value, size_t len) |
| 1051 | { |
| 1052 | char* buf = new char[len + 1]; |
| 1053 | memcpy(buf,value,len); |
| 1054 | buf[len] = '\0'; |
| 1055 | ParticipantHandler::setSDESItem(part,type,buf); |
| 1056 | delete [] buf; |
| 1057 | } |
| 1058 | |
| 1059 | void QueueRTCPManager::setPRIVPrefix(Participant* part, const char* const value, size_t len) |
| 1060 | { |
| 1061 | char *buf = new char[len + 1]; |
| 1062 | memcpy(buf,value,len); |
| 1063 | buf[len] = '\0'; |
| 1064 | ParticipantHandler::setPRIVPrefix(part,buf); |
| 1065 | delete buf; |
| 1066 | } |
| 1067 | |
| 1068 | SDESItemType QueueRTCPManager::scheduleSDESItem() |
| 1069 | { |
| 1070 | uint8 i = 0; |
| 1071 | // TODO: follow, at least, standard priorities |
| 1072 | SDESItemType type = nextScheduledSDESItem; |
| 1073 | |
| 1074 | while ( (queueApplication.getSDESItem(type).length() <= 0) && |
| 1075 | i < (lastSchedulable - firstSchedulable) ) { |
| 1076 | i++; |
| 1077 | type = nextSDESType(type); |
| 1078 | } |
| 1079 | bool empty = true; |
| 1080 | if ( queueApplication.getSDESItem(type).length() > 0 ) |
| 1081 | empty = false; |
| 1082 | nextScheduledSDESItem = nextSDESType(type); |
| 1083 | if ( empty ) |
| 1084 | return SDESItemTypeEND; |
| 1085 | else |
| 1086 | return type; |
| 1087 | } |
| 1088 | |
| 1089 | SDESItemType QueueRTCPManager::nextSDESType(SDESItemType t) |
| 1090 | { |
| 1091 | t = static_cast<SDESItemType>( static_cast<int>(t) + 1 ); |
| 1092 | if ( t > lastSchedulable ) |
| 1093 | t = firstSchedulable; |
| 1094 | return t; |
| 1095 | } |
| 1096 | |
| 1097 | size_t QueueRTCPManager::sendControlToDestinations(unsigned char* buffer, size_t len) |
| 1098 | { |
| 1099 | size_t count = 0; |
| 1100 | lockDestinationList(); |
| 1101 | if ( isSingleDestination() ) { |
| 1102 | count = sendControl(buffer,len); |
| 1103 | } else { |
| 1104 | // when no destination has been added, NULL == dest. |
| 1105 | for (std::list<TransportAddress*>::iterator i = |
| 1106 | destList.begin(); destList.end() != i; i++) { |
| 1107 | TransportAddress* dest = *i; |
| 1108 | setControlPeer(dest->getNetworkAddress(), |
| 1109 | dest->getControlTransportPort()); |
| 1110 | count += sendControl(buffer,len); |
| 1111 | } |
| 1112 | } |
| 1113 | unlockDestinationList(); |
| 1114 | |
| 1115 | return count; |
| 1116 | } |
| 1117 | |
| 1118 | #ifdef CCXX_NAMESPACES |
| 1119 | } |
| 1120 | #endif |
| 1121 | |
| 1122 | /** EMACS ** |
| 1123 | * Local variables: |
| 1124 | * mode: c++ |
| 1125 | * c-basic-offset: 4 |
| 1126 | * End: |
| 1127 | */ |