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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.
*/
#include "pc/rtcp_mux_filter.h"
#include "rtc_base/logging.h"
namespace cricket {
RtcpMuxFilter::RtcpMuxFilter() : state_(ST_INIT), offer_enable_(false) {}
bool RtcpMuxFilter::IsFullyActive() const {
return state_ == ST_ACTIVE;
}
bool RtcpMuxFilter::IsProvisionallyActive() const {
return state_ == ST_SENTPRANSWER || state_ == ST_RECEIVEDPRANSWER;
}
bool RtcpMuxFilter::IsActive() const {
return IsFullyActive() || IsProvisionallyActive();
}
void RtcpMuxFilter::SetActive() {
state_ = ST_ACTIVE;
}
bool RtcpMuxFilter::SetOffer(bool offer_enable, ContentSource src) {
if (state_ == ST_ACTIVE) {
// Fail if we try to deactivate and no-op if we try and activate.
return offer_enable;
}
if (!ExpectOffer(offer_enable, src)) {
RTC_LOG(LS_ERROR) << "Invalid state for change of RTCP mux offer";
return false;
}
offer_enable_ = offer_enable;
state_ = (src == CS_LOCAL) ? ST_SENTOFFER : ST_RECEIVEDOFFER;
return true;
}
bool RtcpMuxFilter::SetProvisionalAnswer(bool answer_enable,
ContentSource src) {
if (state_ == ST_ACTIVE) {
// Fail if we try to deactivate and no-op if we try and activate.
return answer_enable;
}
if (!ExpectAnswer(src)) {
RTC_LOG(LS_ERROR) << "Invalid state for RTCP mux provisional answer";
return false;
}
if (offer_enable_) {
if (answer_enable) {
if (src == CS_REMOTE)
state_ = ST_RECEIVEDPRANSWER;
else // CS_LOCAL
state_ = ST_SENTPRANSWER;
} else {
// The provisional answer doesn't want to use RTCP mux.
// Go back to the original state after the offer was set and wait for next
// provisional or final answer.
if (src == CS_REMOTE)
state_ = ST_SENTOFFER;
else // CS_LOCAL
state_ = ST_RECEIVEDOFFER;
}
} else if (answer_enable) {
// If the offer didn't specify RTCP mux, the answer shouldn't either.
RTC_LOG(LS_WARNING) << "Invalid parameters in RTCP mux provisional answer";
return false;
}
return true;
}
bool RtcpMuxFilter::SetAnswer(bool answer_enable, ContentSource src) {
if (state_ == ST_ACTIVE) {
// Fail if we try to deactivate and no-op if we try and activate.
return answer_enable;
}
if (!ExpectAnswer(src)) {
RTC_LOG(LS_ERROR) << "Invalid state for RTCP mux answer";
return false;
}
if (offer_enable_ && answer_enable) {
state_ = ST_ACTIVE;
} else if (answer_enable) {
// If the offer didn't specify RTCP mux, the answer shouldn't either.
RTC_LOG(LS_WARNING) << "Invalid parameters in RTCP mux answer";
return false;
} else {
state_ = ST_INIT;
}
return true;
}
bool RtcpMuxFilter::ExpectOffer(bool offer_enable, ContentSource source) {
return ((state_ == ST_INIT) ||
(state_ == ST_ACTIVE && offer_enable == offer_enable_) ||
(state_ == ST_SENTOFFER && source == CS_LOCAL) ||
(state_ == ST_RECEIVEDOFFER && source == CS_REMOTE));
}
bool RtcpMuxFilter::ExpectAnswer(ContentSource source) {
return ((state_ == ST_SENTOFFER && source == CS_REMOTE) ||
(state_ == ST_RECEIVEDOFFER && source == CS_LOCAL) ||
(state_ == ST_SENTPRANSWER && source == CS_LOCAL) ||
(state_ == ST_RECEIVEDPRANSWER && source == CS_REMOTE));
}
} // namespace cricket
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