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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 <glog/logging.h>
#include <protocols/rtc/rtc_consts.h>
#include <protocols/rtc/rtc_rs_delay.h>
namespace transport {
namespace protocol {
namespace rtc {
RecoveryStrategyDelayBased::RecoveryStrategyDelayBased(
Indexer *indexer, SendRtxCallback &&callback, asio::io_service &io_service,
interface::StrategyCallback *external_callback)
: RecoveryStrategy(indexer, std::move(callback), io_service, true, false,
external_callback), // start with rtx
congestion_state_(false),
probing_state_(false),
switch_rounds_(0) {}
RecoveryStrategyDelayBased::RecoveryStrategyDelayBased(RecoveryStrategy &&rs)
: RecoveryStrategy(std::move(rs)) {
setRtxFec(true, false);
// we have to re-init congestion and
// probing
congestion_state_ = false;
probing_state_ = false;
}
RecoveryStrategyDelayBased::~RecoveryStrategyDelayBased() {}
void RecoveryStrategyDelayBased::softSwitchToFec(uint32_t fec_to_ask) {
if (fec_to_ask == 0) {
setRtxFec(true, false);
switch_rounds_ = 0;
} else {
switch_rounds_++;
if (switch_rounds_ >= 5) {
setRtxFec(false, true);
} else {
setRtxFec({}, true);
}
}
}
void RecoveryStrategyDelayBased::onNewRound(bool in_sync) {
if (!recovery_on_) {
// disable fec so that no extra packet will be sent
// for rtx we check if recovery is on in newPacketLoss
setRtxFec(true, false);
indexer_->setNFec(0);
return;
}
uint64_t rtt = state_->getMinRTT();
bool congestion = false;
// XXX at the moment we are not looking at congestion events
// congestion = rc_->inCongestionState();
if ((!fec_on_ && rtt >= 100) || (fec_on_ && rtt > 80) || congestion) {
// switch from rtx to fec or keep use fec. Notice that if some rtx are
// waiting to be scheduled, they will be sent normally, but no new rtx will
// be created If the loss rate is 0 keep to use RTX.
uint32_t fec_to_ask = computeFecPacketsToAsk(in_sync);
softSwitchToFec(fec_to_ask);
indexer_->setNFec(fec_to_ask);
return;
}
if ((fec_on_ && rtt <= 80) || (!rtx_on_ && rtt <= 100)) {
// turn on rtx
softSwitchToFec(0);
indexer_->setNFec(0);
return;
}
}
void RecoveryStrategyDelayBased::newPacketLoss(uint32_t seq) {
if (rtx_on_ && recovery_on_) {
addNewRtx(seq, false);
} else {
if (!state_->isPending(seq) && !indexer_->isFec(seq)) {
addNewRtx(seq, true);
} else {
recover_with_fec_.insert(seq);
state_->onPossibleLossWithNoRtx(seq);
}
}
}
void RecoveryStrategyDelayBased::receivedPacket(uint32_t seq) {
removePacketState(seq);
}
void RecoveryStrategyDelayBased::probing() {
// TODO
// for the moment ask for all fec and exit the probing phase
probing_state_ = false;
setRtxFec(false, true);
indexer_->setNFec(computeFecPacketsToAsk(true));
}
} // end namespace rtc
} // end namespace protocol
} // end namespace transport
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