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/*
* Copyright (c) 2017-2021 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_frame.h>
#include <algorithm>
namespace transport {
namespace protocol {
namespace rtc {
RTCRateControlFrame::RTCRateControlFrame() : cc_detector_() {}
RTCRateControlFrame::~RTCRateControlFrame() {}
void RTCRateControlFrame::onNewRound(double round_len) {
if (!rc_on_) return;
CongestionState prev_congestion_state = congestion_state_;
cc_detector_.updateStats();
congestion_state_ = (CongestionState)cc_detector_.getState();
if (congestion_state_ == CongestionState::Congested) {
if (prev_congestion_state == CongestionState::Normal) {
// congestion detected, notify app and init congestion win
double prod_rate = protocol_state_->getReceivedRate();
double rtt = (double)protocol_state_->getRTT() / MILLI_IN_A_SEC;
double packet_size = protocol_state_->getAveragePacketSize();
if (prod_rate == 0.0 || rtt == 0.0 || packet_size == 0.0) {
// TODO do something
return;
}
congestion_win_ = (uint32_t)ceil(prod_rate * rtt / packet_size);
}
uint32_t win = congestion_win_ * WIN_DECREASE_FACTOR;
congestion_win_ = std::max(win, WIN_MIN);
return;
}
}
void RTCRateControlFrame::onDataPacketReceived(
const core::ContentObject &content_object) {
if (!rc_on_) return;
uint32_t seq = content_object.getName().getSuffix();
if (!protocol_state_->isPending(seq)) return;
cc_detector_.addPacket(content_object);
}
void RTCRateControlFrame::receivedBwProbeTrain(uint64_t firts_probe_ts,
uint64_t last_probe_ts,
uint32_t total_probes) {
// TODO
return;
}
} // end namespace rtc
} // end namespace protocol
} // end namespace transport
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