talk/session/phone/rtcpmuxfilter.h

/*
 * libjingle
 * Copyright 2004--2010, Google Inc.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *  3. The name of the author may not be used to endorse or promote products
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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#ifndef TALK_SESSION_PHONE_RTCPMUXFILTER_H_
#define TALK_SESSION_PHONE_RTCPMUXFILTER_H_

#include "talk/base/basictypes.h"
#include "talk/p2p/base/sessiondescription.h"

namespace cricket {

// RTCP Muxer, as defined in RFC 5761 (http://tools.ietf.org/html/rfc5761)
class RtcpMuxFilter {
 public:
  RtcpMuxFilter();

  // Whether the filter is active, i.e. has RTCP mux been properly negotiated.
  bool IsActive() const;

  // Specifies whether the offer indicates the use of RTCP mux.
  bool SetOffer(bool offer_enable, ContentSource src);

  // Specifies whether the answer indicates the use of RTCP mux.
  bool SetAnswer(bool answer_enable, ContentSource src);

  // Determines whether the specified packet is RTCP.
  bool DemuxRtcp(const char* data, int len);

 private:
  enum State { ST_INIT, ST_SENTOFFER, ST_RECEIVEDOFFER, ST_ACTIVE };
  State state_;
  bool offer_enable_;
};

}  // namespace cricket

#endif  // TALK_SESSION_PHONE_RTCPMUXFILTER_H_