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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
namespace transport {
namespace protocol {
namespace rtc {
class RTCQualityScore {
public:
RTCQualityScore(){};
~RTCQualityScore(){};
uint8_t getQualityScore(uint64_t RTT, uint32_t loss_rate) {
uint32_t delay_index = getDelay(RTT);
uint32_t loss_index = getLossRate(loss_rate);
return quality_score_[loss_index][delay_index];
}
private:
// see quality score map
uint8_t quality_score_[7][6]{{5, 5, 5, 4, 3, 1}, {5, 4, 3, 2, 1, 1},
{5, 3, 2, 1, 1, 1}, {5, 2, 1, 1, 1, 1},
{4, 1, 1, 1, 1, 1}, {3, 1, 1, 1, 1, 1},
{1, 1, 1, 1, 1, 1}};
uint8_t getDelay(uint64_t RTT) {
uint64_t OWD = RTT / 2;
// we should never get a OWD of 0. so we take the first col if OWD is < 5ms
if (OWD < 5) return 0;
if (OWD < 50) return 1;
if (OWD < 100) return 2;
if (OWD < 200) return 3;
if (OWD < 300) return 4;
return 5;
}
uint8_t getLossRate(uint32_t loss_rate) {
// we use 3% as mean loss rate
if (loss_rate < 3) return 0;
if (loss_rate < 10) return 1;
if (loss_rate < 20) return 2;
if (loss_rate < 30) return 3;
if (loss_rate < 40) return 4;
if (loss_rate < 50) return 5;
return 6;
}
};
} // namespace rtc
} // namespace protocol
} // namespace transport
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