1 /* 2 * libjingle 3 * Copyright 2004 Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef TALK_SESSION_MEDIA_RTCPMUXFILTER_H_ 29 #define TALK_SESSION_MEDIA_RTCPMUXFILTER_H_ 30 31 #include "webrtc/p2p/base/sessiondescription.h" 32 #include "webrtc/base/basictypes.h" 33 34 namespace cricket { 35 36 // RTCP Muxer, as defined in RFC 5761 (http://tools.ietf.org/html/rfc5761) 37 class RtcpMuxFilter { 38 public: 39 RtcpMuxFilter(); 40 41 // Whether the filter is active, i.e. has RTCP mux been properly negotiated. 42 bool IsActive() const; 43 44 // Make the filter active, regardless of the current state. 45 void SetActive(); 46 47 // Specifies whether the offer indicates the use of RTCP mux. 48 bool SetOffer(bool offer_enable, ContentSource src); 49 50 // Specifies whether the provisional answer indicates the use of RTCP mux. 51 bool SetProvisionalAnswer(bool answer_enable, ContentSource src); 52 53 // Specifies whether the answer indicates the use of RTCP mux. 54 bool SetAnswer(bool answer_enable, ContentSource src); 55 56 // Determines whether the specified packet is RTCP. 57 bool DemuxRtcp(const char* data, int len); 58 59 private: 60 bool ExpectOffer(bool offer_enable, ContentSource source); 61 bool ExpectAnswer(ContentSource source); 62 enum State { 63 // RTCP mux filter unused. 64 ST_INIT, 65 // Offer with RTCP mux enabled received. 66 // RTCP mux filter is not active. 67 ST_RECEIVEDOFFER, 68 // Offer with RTCP mux enabled sent. 69 // RTCP mux filter can demux incoming packets but is not active. 70 ST_SENTOFFER, 71 // RTCP mux filter is active but the sent answer is only provisional. 72 // When the final answer is set, the state transitions to ST_ACTIVE or 73 // ST_INIT. 74 ST_SENTPRANSWER, 75 // RTCP mux filter is active but the received answer is only provisional. 76 // When the final answer is set, the state transitions to ST_ACTIVE or 77 // ST_INIT. 78 ST_RECEIVEDPRANSWER, 79 // Offer and answer set, RTCP mux enabled. It is not possible to de-activate 80 // the filter. 81 ST_ACTIVE 82 }; 83 State state_; 84 bool offer_enable_; 85 }; 86 87 } // namespace cricket 88 89 #endif // TALK_SESSION_MEDIA_RTCPMUXFILTER_H_ 90