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| 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 <memory> | |
| 15 | |
| 16 #include "webrtc/base/exp_filter.h" | |
| 17 #include "webrtc/system_wrappers/include/clock.h" | |
| 18 | |
| 19 namespace webrtc { | |
| 20 | |
| 21 namespace voe { | |
| 22 | |
| 23 // NetworkPredictor is to predict network conditions e.g., packet loss rate, for | |
| 24 // sender and/or receiver to cope with changes in the network condition. | |
| 25 class NetworkPredictor { | |
| 26 public: | |
| 27 explicit NetworkPredictor(Clock* clock); | |
| 28 ~NetworkPredictor() {} | |
| 29 | |
| 30 // Gets the predicted packet loss rate. | |
| 31 uint8_t GetLossRate(); | |
| 32 | |
| 33 // Updates the packet loss rate predictor, on receiving a new observation of | |
| 34 // packet loss rate from past. Input packet loss rate should be in the | |
| 35 // interval [0, 255]. | |
| 36 void UpdatePacketLossRate(uint8_t loss_rate); | |
| 37 | |
| 38 private: | |
| 39 Clock* clock_; | |
| 40 int64_t last_loss_rate_update_time_ms_; | |
| 41 | |
| 42 // An exponential filter is used to predict packet loss rate. | |
| 43 std::unique_ptr<rtc::ExpFilter> loss_rate_filter_; | |
| 44 }; | |
| 45 | |
| 46 } // namespace voe | |
| 47 } // namespace webrtc | |
| 48 #endif // WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_ | |
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