| /* |
| * Copyright 2018 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| #include "modules/congestion_controller/bbr/loss_rate_filter.h" |
| |
| namespace webrtc { |
| namespace bbr { |
| namespace { |
| // From SendSideBandwidthEstimation. |
| const int kLimitNumPackets = 20; |
| // From RTCPSender video report interval. |
| const int64_t kUpdateIntervalMs = 1000; |
| } // namespace |
| |
| LossRateFilter::LossRateFilter() |
| : lost_packets_since_last_loss_update_(0), |
| expected_packets_since_last_loss_update_(0), |
| loss_rate_estimate_(0.0), |
| next_loss_update_ms_(0) {} |
| |
| void LossRateFilter::UpdateWithLossStatus(int64_t feedback_time, |
| int packets_sent, |
| int packets_lost) { |
| lost_packets_since_last_loss_update_ += packets_lost; |
| expected_packets_since_last_loss_update_ += packets_sent; |
| |
| if (feedback_time >= next_loss_update_ms_ && |
| expected_packets_since_last_loss_update_ >= kLimitNumPackets) { |
| int64_t lost = lost_packets_since_last_loss_update_; |
| int64_t expected = expected_packets_since_last_loss_update_; |
| loss_rate_estimate_ = static_cast<double>(lost) / expected; |
| next_loss_update_ms_ = feedback_time + kUpdateIntervalMs; |
| lost_packets_since_last_loss_update_ = 0; |
| expected_packets_since_last_loss_update_ = 0; |
| } |
| } |
| |
| double LossRateFilter::GetLossRate() const { |
| return loss_rate_estimate_; |
| } |
| } // namespace bbr |
| } // namespace webrtc |