Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | // Copyright (C) 2001,2002,2004 Federico Montesino Pouzols <fedemp@altern.org>. |
| 2 | // |
| 3 | // This program is free software; you can redistribute it and/or modify |
| 4 | // it under the terms of the GNU General Public License as published by |
| 5 | // the Free Software Foundation; either version 2 of the License, or |
| 6 | // (at your option) any later version. |
| 7 | // |
| 8 | // This program is distributed in the hope that it will be useful, |
| 9 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | // GNU General Public License for more details. |
| 12 | // |
| 13 | // You should have received a copy of the GNU General Public License |
| 14 | // along with this program; if not, write to the Free Software |
| 15 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 16 | // |
| 17 | // As a special exception, you may use this file as part of a free software |
| 18 | // library without restriction. Specifically, if other files instantiate |
| 19 | // templates or use macros or inline functions from this file, or you compile |
| 20 | // this file and link it with other files to produce an executable, this |
| 21 | // file does not by itself cause the resulting executable to be covered by |
| 22 | // the GNU General Public License. This exception does not however |
| 23 | // invalidate any other reasons why the executable file might be covered by |
| 24 | // the GNU General Public License. |
| 25 | // |
| 26 | // This exception applies only to the code released under the name GNU |
| 27 | // ccRTP. If you copy code from other releases into a copy of GNU |
| 28 | // ccRTP, as the General Public License permits, the exception does |
| 29 | // not apply to the code that you add in this way. To avoid misleading |
| 30 | // anyone as to the status of such modified files, you must delete |
| 31 | // this exception notice from them. |
| 32 | // |
| 33 | // If you write modifications of your own for GNU ccRTP, it is your choice |
| 34 | // whether to permit this exception to apply to your modifications. |
| 35 | // If you do not wish that, delete this exception notice. |
| 36 | // |
| 37 | |
| 38 | /** |
| 39 | * @file cqueue.h |
| 40 | * |
| 41 | * @short Generic RTCP control queues. |
| 42 | **/ |
| 43 | |
| 44 | #ifndef CCXX_RTP_CQUEUE_H_ |
| 45 | #define CCXX_RTP_CQUEUE_H_ |
| 46 | |
| 47 | #include <ccrtp/ioqueue.h> |
| 48 | |
| 49 | #ifdef CCXX_NAMESPACES |
| 50 | namespace ost { |
| 51 | #endif |
| 52 | |
| 53 | /** |
| 54 | * @defgroup cqueue Generic RTCP control queues. |
| 55 | * @{ |
| 56 | **/ |
| 57 | |
| 58 | /** |
| 59 | * @class QueueRTCPManager |
| 60 | * @short Adds generic management of RTCP functions to an RTP data |
| 61 | * queue. |
| 62 | * |
| 63 | * Extends an RTP data i/o queue adding management of RTCP functions: |
| 64 | * |
| 65 | * Provide feedback on the quality of the data distribution. |
| 66 | * |
| 67 | * Convey the CNAME (persistent transport-level identifier) for every |
| 68 | * RTP source. |
| 69 | * |
| 70 | * Control the sending rate of RTCP packets |
| 71 | * |
| 72 | * Convey minimal control information about the participants |
| 73 | * |
| 74 | * This class implements generic RTCP behaviour (as specified in RFC |
| 75 | * 1889/draft-ietf-avt-rtp-new) and may be specialized for specific |
| 76 | * profiles (see AVPQueue) or particular RTCP extensions. |
| 77 | * |
| 78 | * @author Federico Montesino Pouzols <fedemp@altern.org> |
| 79 | **/ |
| 80 | class __EXPORT QueueRTCPManager : public RTPDataQueue, |
| 81 | protected RTCPCompoundHandler |
| 82 | { |
| 83 | public: |
| 84 | /** |
| 85 | * Get the most recent sender report received from a |
| 86 | * synchronization source. |
| 87 | * |
| 88 | * @param src Synchronization source of the sender info. |
| 89 | * @return Most recent sender info received from src. |
| 90 | * @retval NULL when no sender report has been received from |
| 91 | * the specified source. |
| 92 | **/ |
| 93 | RTCPSenderInfo* getMRSenderInfo(SyncSource& src); |
| 94 | |
| 95 | /** |
| 96 | * Ask for the info in the most recent receiver report about |
| 97 | * the local source received from the source given as |
| 98 | * parameter. |
| 99 | * |
| 100 | * @param srcFrom Source of the receiver info. |
| 101 | * @return most recent receiver info received from src. |
| 102 | * @retval NULL when no receiver report has been received from |
| 103 | * the specified source. |
| 104 | */ |
| 105 | RTCPReceiverInfo* getMRReceiverInfo(SyncSource& srcFrom); |
| 106 | |
| 107 | /** |
| 108 | * Set how much time the stack will wait before deleting a |
| 109 | * synchronization source that has sent an RTCP BYE packet. |
| 110 | * |
| 111 | * @param delay delay in microseconds. |
| 112 | * |
| 113 | * @note The default delay is 1000000 microseconds |
| 114 | **/ |
| 115 | void setLeavingDelay(microtimeout_t delay) |
| 116 | { leavingDelay = delay; } |
| 117 | |
| 118 | /** |
| 119 | * This method sets the maximum end to end delay allowed. If |
| 120 | * the processing delay plus the trip time for a packet is |
| 121 | * greater than the end to end delay, the packet is discarded, |
| 122 | * and the application cannot get it. |
| 123 | * |
| 124 | * This is a way of setting an upper bound to the end to end |
| 125 | * delay, computed as the elapsed time between the packet |
| 126 | * timestamping at the sender side, and the picking of the |
| 127 | * packet at the receiver side. |
| 128 | * |
| 129 | * @param t maximum end to end delay allowed. A value of 0 |
| 130 | * implies there is no limit and is the default |
| 131 | */ |
| 132 | inline void |
| 133 | setEnd2EndDelay(microtimeout_t t) |
| 134 | { end2EndDelay = t; } |
| 135 | |
| 136 | inline microtimeout_t |
| 137 | getDefaultEnd2EndDelay() const |
| 138 | { return defaultEnd2EndDelay; } |
| 139 | |
| 140 | inline microtimeout_t |
| 141 | getEnd2EndDelay() const |
| 142 | { return end2EndDelay; } |
| 143 | |
| 144 | /** |
| 145 | * Specify the fraction of the total control bandwith to be |
| 146 | * dedicated to senders reports. |
| 147 | * |
| 148 | * @param fraction fraction of bandwidth, must be between 0 an 1. |
| 149 | * |
| 150 | * This method sets the fraction of the global control |
| 151 | * bandwidth that will be dedicated to senders reports. Of |
| 152 | * course, <code>1 - fraction</code> will be dedicated to |
| 153 | * receivers reports. |
| 154 | * |
| 155 | * @see setControlBandwidth |
| 156 | */ |
| 157 | inline void |
| 158 | setSendersControlFraction(float fraction) |
| 159 | { sendControlBwFract = fraction; recvControlBwFract = 1 - fraction;} |
| 160 | |
| 161 | /** |
| 162 | * Manually set the minimum interval for sending RTP compound |
| 163 | * packets |
| 164 | * |
| 165 | * @param interval minimum interval between RTCP packets, in |
| 166 | * microseconds. |
| 167 | * |
| 168 | * @see computeRTCPInterval() |
| 169 | **/ |
| 170 | void |
| 171 | setMinRTCPInterval(microtimeout_t interval) |
| 172 | { rtcpMinInterval = interval; } |
| 173 | |
| 174 | /** |
| 175 | * Get the total number of RTCP packets sent until now |
| 176 | **/ |
| 177 | inline uint32 |
| 178 | getSendRTCPPacketCount() const |
| 179 | { return ctrlSendCount; } |
| 180 | |
| 181 | protected: |
| 182 | QueueRTCPManager(uint32 size = RTPDataQueue::defaultMembersHashSize, |
| 183 | RTPApplication& app = defaultApplication()); |
| 184 | |
| 185 | QueueRTCPManager(uint32 ssrc, |
| 186 | uint32 size = RTPDataQueue::defaultMembersHashSize, |
| 187 | RTPApplication& app = defaultApplication()); |
| 188 | |
| 189 | virtual |
| 190 | ~QueueRTCPManager(); |
| 191 | |
| 192 | const RTPApplication& |
| 193 | getApplication() |
| 194 | { return queueApplication; } |
| 195 | |
| 196 | inline void |
| 197 | setControlBandwidth(float fraction) |
| 198 | { controlBwFract = fraction; } |
| 199 | |
| 200 | float |
| 201 | getControlBandwidth() const |
| 202 | { return controlBwFract; } |
| 203 | |
| 204 | /** |
| 205 | * Build and send RTCP packets following timing rules |
| 206 | * (including the "timer reconsideration" algorithm). |
| 207 | **/ |
| 208 | void |
| 209 | controlTransmissionService(); |
| 210 | |
| 211 | /** |
| 212 | * Process incoming RTCP packets pending in the control |
| 213 | * reception socket. |
| 214 | **/ |
| 215 | void |
| 216 | controlReceptionService(); |
| 217 | |
| 218 | /** |
| 219 | * Appy collision and loop detection and correction algorithm |
| 220 | * when receiving RTCP packets. Follows section 8.2 in |
| 221 | * draft-ietf-avp-rtp-new. |
| 222 | * |
| 223 | * @param sourceLink link to the source object. |
| 224 | * @param is_new whether the source has been just recorded. |
| 225 | * @param na RTCP packet network address. |
| 226 | * @param tp RTCP packet source transport port. |
| 227 | * |
| 228 | * @return whether the packet must not be discarded. |
| 229 | **/ |
| 230 | bool checkSSRCInRTCPPkt(SyncSourceLink& sourceLink, bool is_new, |
| 231 | InetAddress& na, tpport_t tp); |
| 232 | |
| 233 | void |
| 234 | endQueueRTCPManager(); |
| 235 | |
| 236 | /** |
| 237 | * Plug-in for processing (acquire information carried in) an |
| 238 | * incoming RTCP Sender Report. The default implementation in |
| 239 | * this class only processes the sender information and the |
| 240 | * receiver report blocks about the local source. |
| 241 | * |
| 242 | * @param source Synchronization source this report comes from. |
| 243 | * @param SR Sender report structure. |
| 244 | * @param blocks Number of report blocks in the packet. |
| 245 | **/ |
| 246 | virtual void |
| 247 | onGotSR(SyncSource& source, SendReport& SR, uint8 blocks); |
| 248 | |
| 249 | /** |
| 250 | * Plug-in for processing (acquire information carried in) an |
| 251 | * incoming RTCP Receiver Report. The default implementation |
| 252 | * in this class only processes the receiver report blocks |
| 253 | * about the local source. |
| 254 | * |
| 255 | * @param source Synchronization source this report comes from. |
| 256 | * @param RR Receiver report structure |
| 257 | * @param blocks Number of report blocks in the packet |
| 258 | **/ |
| 259 | virtual void |
| 260 | onGotRR(SyncSource& source, RecvReport& RR, uint8 blocks); |
| 261 | |
| 262 | /** |
| 263 | * @param source Synchronization source of SDES RTCP packet. |
| 264 | * @param pkt SDES RTCP packet received. |
| 265 | **/ |
| 266 | bool |
| 267 | onGotSDES(SyncSource& source, RTCPPacket& pkt); |
| 268 | |
| 269 | /** |
| 270 | * Plug-in for handling of SDES chunks. |
| 271 | * |
| 272 | * @param source Synchronization source of SDES chunk. |
| 273 | * @param chunk SDES chunk structure. |
| 274 | * @param len Length of chunk, in octets. |
| 275 | * |
| 276 | * @return whether there was a CNAME. |
| 277 | **/ |
| 278 | virtual bool |
| 279 | onGotSDESChunk(SyncSource& source, SDESChunk& chunk, size_t len); |
| 280 | |
| 281 | /** |
| 282 | * Plug-in for handling of APP (application specific) RTCP |
| 283 | * packets. |
| 284 | * |
| 285 | * @param - Synchronization source of this packet. |
| 286 | * @param - RTCP APP packet struct. |
| 287 | * @param - Length of the app data packet, including ssrc. |
| 288 | * name and app. specific data. |
| 289 | **/ |
| 290 | inline virtual void |
| 291 | onGotAPP(SyncSource&, RTCPCompoundHandler::APPPacket&, |
| 292 | size_t) |
| 293 | { return; } |
| 294 | |
| 295 | inline timeval |
| 296 | getRTCPCheckInterval() |
| 297 | { return rtcpCheckInterval; } |
| 298 | |
| 299 | /** |
| 300 | * Get the number of data packets sent at the time the last SR |
| 301 | * was generated. |
| 302 | **/ |
| 303 | uint32 |
| 304 | getLastSendPacketCount() const |
| 305 | { return lastSendPacketCount; } |
| 306 | |
| 307 | /** |
| 308 | * @param n Number of members. |
| 309 | **/ |
| 310 | inline void |
| 311 | setPrevMembersNum(uint32 n) |
| 312 | { reconsInfo.rtcpPMembers = n; } |
| 313 | |
| 314 | inline uint32 |
| 315 | getPrevMembersCount() const |
| 316 | { return reconsInfo.rtcpPMembers; } |
| 317 | |
| 318 | /** |
| 319 | * This method is used to send an RTCP BYE packet. An RTCP |
| 320 | * BYE packet is sent when one of the the following |
| 321 | * circumstances occur: |
| 322 | * - when leaving the session |
| 323 | * - when we have detected that another synchronization source |
| 324 | * in the same session is using the same SSRC identifier as |
| 325 | * us. |
| 326 | * |
| 327 | * Try to post a BYE message. It will send a BYE packet as |
| 328 | * long as at least one RTP or RTCP packet has been sent |
| 329 | * before. If the number of members in the session is more |
| 330 | * than 50, the algorithm described in section 6.3.7 of |
| 331 | * RFC 3550 is applied in order to avoid a flood |
| 332 | * of BYE messages. |
| 333 | * |
| 334 | * @param reason reason to specify in the BYE packet. |
| 335 | **/ |
| 336 | size_t |
| 337 | dispatchBYE(const std::string& reason); |
| 338 | |
| 339 | size_t |
| 340 | sendControlToDestinations(unsigned char* buffer, size_t len); |
| 341 | |
| 342 | private: |
| 343 | QueueRTCPManager(const QueueRTCPManager &o); |
| 344 | |
| 345 | QueueRTCPManager& |
| 346 | operator=(const QueueRTCPManager &o); |
| 347 | |
| 348 | /** |
| 349 | * Posting of RTCP messages. |
| 350 | * |
| 351 | * @return std::size_t number of octets sent |
| 352 | */ |
| 353 | size_t |
| 354 | dispatchControlPacket(); |
| 355 | |
| 356 | /** |
| 357 | * For picking up incoming RTCP packets if they are waiting. A |
| 358 | * timeout for the maximum interval since the last RTCP packet |
| 359 | * had been received is also returned. This is checked every |
| 360 | * rtcpCheckInterval seconds. |
| 361 | * |
| 362 | * This method decomposes all incoming RTCP compound packets |
| 363 | * pending in the control socket and processes each RTCP |
| 364 | * packet. |
| 365 | * |
| 366 | **/ |
| 367 | void |
| 368 | takeInControlPacket(); |
| 369 | |
| 370 | /** |
| 371 | * Computes the interval for sending RTCP compound packets, |
| 372 | * based on the average size of RTCP packets sent and |
| 373 | * received, and the current estimated number of participants |
| 374 | * in the session. |
| 375 | * |
| 376 | * @note This currently follows the rules in section 6 of |
| 377 | * RFC 3550 |
| 378 | * @todo make it more flexible as recommended in the draft. For now, |
| 379 | * we have setMinRTCPInterval. |
| 380 | * |
| 381 | * @return interval for sending RTCP compound packets |
| 382 | **/ |
| 383 | virtual timeval |
| 384 | computeRTCPInterval(); |
| 385 | |
| 386 | /** |
| 387 | * Choose which should be the type of the next SDES item |
| 388 | * sent. This method is called when packing SDES chunks in a |
| 389 | * new RTCP packet. |
| 390 | * |
| 391 | * @return type of the next SDES item to be sent |
| 392 | **/ |
| 393 | virtual SDESItemType |
| 394 | scheduleSDESItem(); |
| 395 | |
| 396 | /** |
| 397 | * Plug-in for SSRC collision handling. |
| 398 | * |
| 399 | * @param - previously identified source. |
| 400 | **/ |
| 401 | inline virtual void |
| 402 | onSSRCCollision(const SyncSource&) |
| 403 | { } |
| 404 | |
| 405 | /** |
| 406 | * Virtual reimplemented from RTPDataQueue |
| 407 | **/ |
| 408 | virtual bool |
| 409 | end2EndDelayed(IncomingRTPPktLink& p); |
| 410 | |
| 411 | /** |
| 412 | * Plug-in for processing of SR/RR RTCP packet |
| 413 | * profile-specific extensions (third part of SR reports or |
| 414 | * second part of RR reports). |
| 415 | * |
| 416 | * @param - Content of the profile extension. |
| 417 | * @param - Length of the extension, in octets. |
| 418 | **/ |
| 419 | inline virtual void |
| 420 | onGotRRSRExtension(unsigned char*, size_t) |
| 421 | { return; } |
| 422 | |
| 423 | /** |
| 424 | * A plugin point for goodbye message. Called when a BYE RTCP |
| 425 | * packet has been received from a valid synchronization |
| 426 | * source. |
| 427 | * |
| 428 | * @param - synchronization source from what a BYE RTCP |
| 429 | * packet has been just received. |
| 430 | * @param - reason string the source has provided. |
| 431 | **/ |
| 432 | inline virtual void |
| 433 | onGotGoodbye(const SyncSource&, const std::string&) |
| 434 | { return; } |
| 435 | |
| 436 | /** |
| 437 | * Process a BYE packet just received and identified. |
| 438 | * |
| 439 | * @param pkt previously identified RTCP BYE packet |
| 440 | * @param pointer octet number in the RTCP reception buffer |
| 441 | * where the packet is stored |
| 442 | * @param len total length of the compount RTCP packet the BYE |
| 443 | * packet to process is contained |
| 444 | * |
| 445 | * @bug if the bye packet contains several SSRCs, |
| 446 | * eventSourceLeaving is only called for the last one |
| 447 | **/ |
| 448 | bool |
| 449 | getBYE(RTCPPacket &pkt, size_t &pointer, size_t len); |
| 450 | |
| 451 | /** |
| 452 | * @return number of Report Blocks packed |
| 453 | **/ |
| 454 | uint8 |
| 455 | packReportBlocks(RRBlock* blocks, uint16& len, uint16& available); |
| 456 | |
| 457 | /** |
| 458 | * Builds an SDES RTCP packet. Each chunk is built following |
| 459 | * appendix A.4 in draft-ietf-avt-rtp-new. |
| 460 | * |
| 461 | * @param len provisionary length of the RTCP compound packet |
| 462 | * |
| 463 | * @return |
| 464 | **/ |
| 465 | void |
| 466 | packSDES(uint16& len); |
| 467 | |
| 468 | /** |
| 469 | * This must be called in order to update the average RTCP compound |
| 470 | * packet size estimation when: |
| 471 | * |
| 472 | * a compoung RTCP packet is received (6.3.3). |
| 473 | * |
| 474 | * a compound RTCP packet is transmitted (6.3.6). |
| 475 | * |
| 476 | * @param len length in octets of the compound RTCP packet |
| 477 | * just received/transmitted. |
| 478 | **/ |
| 479 | void |
| 480 | updateAvgRTCPSize(size_t len); |
| 481 | |
| 482 | /** |
| 483 | * Apply reverse reconsideration adjustment to timing |
| 484 | * parameters when receiving BYE packets and not waiting to |
| 485 | * send a BYE. |
| 486 | **/ |
| 487 | void |
| 488 | reverseReconsideration(); |
| 489 | |
| 490 | bool |
| 491 | timerReconsideration(); |
| 492 | |
| 493 | /** |
| 494 | * Purge sources that do not seem active any more. |
| 495 | * |
| 496 | * @note MUST be perform at least every RTCP transmission |
| 497 | * interval |
| 498 | * @todo implement it. It may be dangerous and anyway should |
| 499 | * be optional. |
| 500 | **/ |
| 501 | void |
| 502 | expireSSRCs(); |
| 503 | |
| 504 | /** |
| 505 | * To be executed when whe are leaving the session. |
| 506 | **/ |
| 507 | void |
| 508 | getOnlyBye(); |
| 509 | |
| 510 | /** |
| 511 | * Set item value from a string without null termination (as |
| 512 | * it is transported in RTCP packets). |
| 513 | **/ |
| 514 | void |
| 515 | setSDESItem(Participant* part, SDESItemType type, |
| 516 | const char* const value, size_t len); |
| 517 | |
| 518 | /** |
| 519 | * Set PRIV item previx value from a string without null |
| 520 | * termination (as it is transported in RTCP packets). |
| 521 | **/ |
| 522 | void |
| 523 | setPRIVPrefix(Participant* part, const char* const value, size_t len); |
| 524 | |
| 525 | /** |
| 526 | * For certain control calculations in RTCP, the size of the |
| 527 | * underlying network and transport protocols is needed. This |
| 528 | * method provides the size of the network level header for |
| 529 | * the default case of IP (20 octets). In case other protocol |
| 530 | * with different header size is used, this method should be |
| 531 | * redefined in a new specialized class. |
| 532 | * |
| 533 | * @return size of the headers of the network level. IP (20) by |
| 534 | * default. |
| 535 | **/ |
| 536 | inline virtual uint16 |
| 537 | networkHeaderSize() |
| 538 | { return 20; } |
| 539 | |
| 540 | /** |
| 541 | * For certain control calculations in RTCP, the size of the |
| 542 | * underlying network and transport protocols is needed. This |
| 543 | * method provides the size of the transport level header for |
| 544 | * the default case of UDP (8 octets). In case other protocol |
| 545 | * with different header size is used, this method should be |
| 546 | * redefined in a new specialized class. |
| 547 | * |
| 548 | * return size of the headers of the transport level. UDP (8) |
| 549 | * by default |
| 550 | **/ |
| 551 | inline virtual uint16 |
| 552 | transportHeaderSize() |
| 553 | { return 8; } |
| 554 | |
| 555 | SDESItemType |
| 556 | nextSDESType(SDESItemType t); |
| 557 | |
| 558 | virtual size_t |
| 559 | sendControl(const unsigned char* const buffer, size_t len) = 0; |
| 560 | |
| 561 | virtual size_t |
| 562 | recvControl(unsigned char* buffer, size_t len, |
| 563 | InetHostAddress& na, tpport_t& tp) = 0; |
| 564 | |
| 565 | virtual bool |
| 566 | isPendingControl(microtimeout_t timeout) = 0; |
| 567 | |
| 568 | // whether the RTCP service is active |
| 569 | volatile bool controlServiceActive; |
| 570 | float controlBwFract, sendControlBwFract, recvControlBwFract; |
| 571 | // number of RTCP packets sent since the beginning |
| 572 | uint32 ctrlSendCount; |
| 573 | |
| 574 | // Network + transport headers size, typically size of IP + |
| 575 | // UDP headers |
| 576 | uint16 lowerHeadersSize; |
| 577 | |
| 578 | SDESItemType nextScheduledSDESItem; |
| 579 | static const SDESItemType firstSchedulable; |
| 580 | static const SDESItemType lastSchedulable; |
| 581 | |
| 582 | // state for rtcp timing. Its meaning is defined in |
| 583 | // draft-ietf-avt-rtp-new, 6.3. |
| 584 | |
| 585 | // Parameters for timer reconsideration algorithm |
| 586 | struct { |
| 587 | timeval rtcpTp, rtcpTc, rtcpTn; |
| 588 | uint32 rtcpPMembers; |
| 589 | } reconsInfo; |
| 590 | bool rtcpWeSent; |
| 591 | uint16 rtcpAvgSize; |
| 592 | bool rtcpInitial; |
| 593 | // last time we checked if there were incoming RTCP packets |
| 594 | timeval rtcpLastCheck; |
| 595 | // interval to check if there are incoming RTCP packets |
| 596 | timeval rtcpCheckInterval; |
| 597 | // next time to check if there are incoming RTCP packets |
| 598 | timeval rtcpNextCheck; |
| 599 | |
| 600 | // number of RTP data packets sent at the time of the last |
| 601 | // RTCP packet transmission. |
| 602 | uint32 lastSendPacketCount; |
| 603 | |
| 604 | // minimum interval for transmission of RTCP packets. The |
| 605 | // result of computeRTCPInterval will always be >= (times a |
| 606 | // random number between 0.5 and 1.5). |
| 607 | microtimeout_t rtcpMinInterval; |
| 608 | |
| 609 | microtimeout_t leavingDelay; |
| 610 | static const microtimeout_t defaultEnd2EndDelay; |
| 611 | // Maximum delay allowed between packet timestamping and |
| 612 | // packet availability for the application. |
| 613 | microtimeout_t end2EndDelay; |
| 614 | // Application this queue is bound to. |
| 615 | RTPApplication& queueApplication; |
| 616 | |
| 617 | // an empty RTPData |
| 618 | static const uint16 TIMEOUT_MULTIPLIER; |
| 619 | static const double RECONSIDERATION_COMPENSATION; |
| 620 | }; |
| 621 | |
| 622 | /** |
| 623 | * This class, an RTP/RTCP queue, adds audio/video profile (AVP) |
| 624 | * specific methods to the generic RTCP service queue |
| 625 | * (QueueRTCPManager). |
| 626 | * |
| 627 | * @author Federico Montesino Pouzols <fedemp@altern.org> |
| 628 | **/ |
| 629 | class AVPQueue : public QueueRTCPManager |
| 630 | { |
| 631 | public: |
| 632 | /** |
| 633 | * Specify the bandwith available for control (RTCP) packets. |
| 634 | * This method sets the global control bandwidth for both |
| 635 | * sender and receiver reports. As recommended in RFC 1890, |
| 636 | * 1/4 of the total control bandwidth is dedicated to senders, |
| 637 | * whereas 3/4 are dedicated to receivers. |
| 638 | * |
| 639 | * @param fraction fraction of the session bandwidth, between |
| 640 | * 0 and 1 |
| 641 | * |
| 642 | * @note If this method is not called, it is assumed that the |
| 643 | * control bandwidth is equal to 5% of the session |
| 644 | * bandwidth. Note also that the RFC RECOMMENDS the 5%. |
| 645 | * |
| 646 | **/ |
| 647 | inline void |
| 648 | setControlBandwidth(float fraction) |
| 649 | { QueueRTCPManager::setControlBandwidth(fraction); } |
| 650 | |
| 651 | float |
| 652 | getControlBandwidth() const |
| 653 | { return QueueRTCPManager::getControlBandwidth(); } |
| 654 | |
| 655 | protected: |
| 656 | AVPQueue(uint32 size = RTPDataQueue::defaultMembersHashSize, |
| 657 | RTPApplication& app = defaultApplication()) : |
| 658 | QueueRTCPManager(size,app) |
| 659 | { } |
| 660 | |
| 661 | /** |
| 662 | * Local SSRC is given instead of computed by the queue. |
| 663 | **/ |
| 664 | AVPQueue(uint32 ssrc, uint32 size = |
| 665 | RTPDataQueue::defaultMembersHashSize, |
| 666 | RTPApplication& app = defaultApplication()) : |
| 667 | QueueRTCPManager(ssrc,size,app) |
| 668 | { } |
| 669 | inline virtual ~AVPQueue() |
| 670 | { } |
| 671 | }; |
| 672 | |
| 673 | /** @}*/ // cqueue |
| 674 | |
| 675 | #ifdef CCXX_NAMESPACES |
| 676 | } |
| 677 | #endif |
| 678 | |
| 679 | #endif //CCXX_RTP_CQUEUE_H_ |
| 680 | |
| 681 | /** EMACS ** |
| 682 | * Local variables: |
| 683 | * mode: c++ |
| 684 | * c-basic-offset: 8 |
| 685 | * End: |
| 686 | */ |