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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.
*/
#pragma once
#include <protocols/rtc/rtc_recovery_strategy.h>
#include <vector>
namespace transport {
namespace protocol {
namespace rtc {
struct thresholds_t {
uint32_t rtt;
uint32_t loss_rtx_to_fec; // loss rate used to move from rtx to fec
uint32_t loss_fec_to_rtx; // loss rate used to move from fec to rtx
};
class RecoveryStrategyLowRate : public RecoveryStrategy {
public:
RecoveryStrategyLowRate(Indexer *indexer, SendRtxCallback &&callback,
asio::io_service &io_service,
interface::RtcTransportRecoveryStrategies rs_type,
interface::StrategyCallback &&external_callback);
RecoveryStrategyLowRate(RecoveryStrategy &&rs);
~RecoveryStrategyLowRate();
void turnOnRecovery();
void onNewRound(bool in_sync);
void newPacketLoss(uint32_t seq);
void receivedPacket(uint32_t seq);
private:
void initSwitchVector();
void setRecoveryParameters(bool use_rtx, bool use_fec, uint32_t fec_to_ask);
void selectRecoveryStrategy(bool in_sync);
uint32_t fec_consecutive_rounds_;
uint32_t rtx_allowed_consecutive_rounds_;
// this table contains the thresholds that indicates when to switch from RTX
// to FEC and viceversa. values in the vector are detected with a set of
// experiments. the vector is used in the following way: if rtt and loss rate
// are less than one of the values in the in the vector, losses are
// recovered using RTX. otherwive losses are recovered using FEC. as for FEC
// only and delay based strategy, the swith from RTX to FEC is smooth,
// meaning that FEC and RTX are used together for some rounds
std::vector<thresholds_t> switch_vector;
};
} // end namespace rtc
} // end namespace protocol
} // end namespace transport
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