diff options
Diffstat (limited to 'third_party/libwebrtc/modules/congestion_controller/pcc/rtt_tracker.cc')
-rw-r--r-- | third_party/libwebrtc/modules/congestion_controller/pcc/rtt_tracker.cc | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/congestion_controller/pcc/rtt_tracker.cc b/third_party/libwebrtc/modules/congestion_controller/pcc/rtt_tracker.cc new file mode 100644 index 0000000000..af9dc8f11b --- /dev/null +++ b/third_party/libwebrtc/modules/congestion_controller/pcc/rtt_tracker.cc @@ -0,0 +1,41 @@ +/* + * Copyright (c) 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/pcc/rtt_tracker.h" + +#include <algorithm> + +namespace webrtc { +namespace pcc { + +RttTracker::RttTracker(TimeDelta initial_rtt, double alpha) + : rtt_estimate_(initial_rtt), alpha_(alpha) {} + +void RttTracker::OnPacketsFeedback( + const std::vector<PacketResult>& packet_feedbacks, + Timestamp feedback_received_time) { + TimeDelta packet_rtt = TimeDelta::MinusInfinity(); + for (const PacketResult& packet_result : packet_feedbacks) { + if (!packet_result.IsReceived()) + continue; + packet_rtt = std::max<TimeDelta>( + packet_rtt, + feedback_received_time - packet_result.sent_packet.send_time); + } + if (packet_rtt.IsFinite()) + rtt_estimate_ = (1 - alpha_) * rtt_estimate_ + alpha_ * packet_rtt; +} + +TimeDelta RttTracker::GetRtt() const { + return rtt_estimate_; +} + +} // namespace pcc +} // namespace webrtc |