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/interface/clock.h"
16
17namespace webrtc {
18
19namespace 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.
23class 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  scoped_ptr<rtc::ExpFilter> loss_rate_filter_;
42};
43
44}  // namespace voe
45}  // namespace webrtc
46#endif  // WEBRTC_VOICE_ENGINE_NETWORK_PREDICTOR_H_
47