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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <protocols/rtc/rtc_consts.h>
#include <protocols/rtc/rtc_rc_congestion_detection.h>
#include <algorithm>
namespace transport {
namespace protocol {
namespace rtc {
RTCRateControlCongestionDetection::RTCRateControlCongestionDetection()
: rounds_without_congestion_(4), last_queue_(0) {} // must be > 3
RTCRateControlCongestionDetection::~RTCRateControlCongestionDetection() {}
void RTCRateControlCongestionDetection::onNewRound(double round_len) {
if (!rc_on_) return;
double rtt = (double)protocol_state_->getMinRTT() / MILLI_IN_A_SEC;
double queue = protocol_state_->getQueuing();
if (rtt == 0.0) return; // no info from the producer
if (last_queue_ == queue) {
// if last_queue == queue the consumer didn't receive any
// packet from the producer. we do not change the current congestion state.
// we just increase the counter of rounds whithout congestion if needed
// (in case of congestion the counter is already set to 0)
if (congestion_state_ == CongestionState::Normal)
rounds_without_congestion_++;
} else {
if (queue > MAX_QUEUING_DELAY) {
// here we detect congestion.
congestion_state_ = CongestionState::Congested;
rounds_without_congestion_ = 0;
} else {
// wait 3 rounds before switch back to no congestion
if (rounds_without_congestion_ > 3) {
// nothing bad is happening
congestion_state_ = CongestionState::Normal;
}
rounds_without_congestion_++;
}
last_queue_ = queue;
}
}
void RTCRateControlCongestionDetection::onDataPacketReceived(
const core::ContentObject &content_object, bool compute_stats) {
// nothing to do
return;
}
} // end namespace rtc
} // end namespace protocol
} // end namespace transport
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