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/*
* Copyright 2004 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef PC_RTCP_MUX_FILTER_H_
#define PC_RTCP_MUX_FILTER_H_
#include "pc/session_description.h"
namespace cricket {
// RTCP Muxer, as defined in RFC 5761 (http://tools.ietf.org/html/rfc5761)
class RtcpMuxFilter {
public:
RtcpMuxFilter();
// Whether RTCP mux has been negotiated with a final answer (not provisional).
bool IsFullyActive() const;
// Whether RTCP mux has been negotiated with a provisional answer; this means
// a later answer could disable RTCP mux, and so the RTCP transport should
// not be disposed yet.
bool IsProvisionallyActive() const;
// Whether the filter is active, i.e. has RTCP mux been properly negotiated,
// either with a final or provisional answer.
bool IsActive() const;
// Make the filter active (fully, not provisionally) regardless of the
// current state. This should be used when an endpoint *requires* RTCP mux.
void SetActive();
// Specifies whether the offer indicates the use of RTCP mux.
bool SetOffer(bool offer_enable, ContentSource src);
// Specifies whether the provisional answer indicates the use of RTCP mux.
bool SetProvisionalAnswer(bool answer_enable, ContentSource src);
// Specifies whether the answer indicates the use of RTCP mux.
bool SetAnswer(bool answer_enable, ContentSource src);
private:
bool ExpectOffer(bool offer_enable, ContentSource source);
bool ExpectAnswer(ContentSource source);
enum State {
// RTCP mux filter unused.
ST_INIT,
// Offer with RTCP mux enabled received.
// RTCP mux filter is not active.
ST_RECEIVEDOFFER,
// Offer with RTCP mux enabled sent.
// RTCP mux filter can demux incoming packets but is not active.
ST_SENTOFFER,
// RTCP mux filter is active but the sent answer is only provisional.
// When the final answer is set, the state transitions to ST_ACTIVE or
// ST_INIT.
ST_SENTPRANSWER,
// RTCP mux filter is active but the received answer is only provisional.
// When the final answer is set, the state transitions to ST_ACTIVE or
// ST_INIT.
ST_RECEIVEDPRANSWER,
// Offer and answer set, RTCP mux enabled. It is not possible to de-activate
// the filter.
ST_ACTIVE
};
State state_;
bool offer_enable_;
};
} // namespace cricket
#endif // PC_RTCP_MUX_FILTER_H_
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