1 /* 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_ 12 #define WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_ 13 14 #include "webrtc/base/exp_filter.h" 15 #include "webrtc/system_wrappers/include/clock.h" 16 17 namespace webrtc { 18 19 namespace voe { 20 21 // NetworkPredictor is to predict network conditions e.g., packet loss rate, for 22 // sender and/or receiver to cope with changes in the network condition. 23 class NetworkPredictor { 24 public: 25 explicit NetworkPredictor(Clock* clock); 26 ~NetworkPredictor() {} 27 28 // Gets the predicted packet loss rate. 29 uint8_t GetLossRate(); 30 31 // Updates the packet loss rate predictor, on receiving a new observation of 32 // packet loss rate from past. Input packet loss rate should be in the 33 // interval [0, 255]. 34 void UpdatePacketLossRate(uint8_t loss_rate); 35 36 private: 37 Clock* clock_; 38 int64_t last_loss_rate_update_time_ms_; 39 40 // An exponential filter is used to predict packet loss rate. 41 rtc::scoped_ptr<rtc::ExpFilter> loss_rate_filter_; 42 }; 43 44 } // namespace voe 45 } // namespace webrtc 46 #endif // WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_ 47
