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1 /* | |
2 * Copyright (c) 2017 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_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_ | |
12 #define WEBRTC_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_ | |
13 | |
14 #include <vector> | |
15 | |
16 #include "webrtc/base/optional.h" | |
17 | |
18 namespace webrtc { | |
19 | |
20 // Computes a bayesian estimate of the throughput given acks containing | |
21 // the arrival time and payload size. Samples which are far from the current | |
22 // estimate or are based on few packets are given a smaller weight, as they | |
23 // are considered to be more likely to have been caused by, e.g., delay spikes | |
24 // unrelated to congestion. | |
25 class BitrateEstimator { | |
26 public: | |
27 BitrateEstimator(); | |
28 virtual ~BitrateEstimator(); | |
29 virtual void Update(int64_t now_ms, int bytes); | |
30 | |
31 virtual rtc::Optional<uint32_t> bitrate_bps() const; | |
32 | |
33 private: | |
34 float UpdateWindow(int64_t now_ms, int bytes, int rate_window_ms); | |
35 int sum_; | |
36 int64_t current_win_ms_; | |
37 int64_t prev_time_ms_; | |
38 float bitrate_estimate_; | |
39 float bitrate_estimate_var_; | |
40 }; | |
41 | |
42 } // namespace webrtc | |
43 | |
44 #endif // WEBRTC_MODULES_CONGESTION_CONTROLLER_BITRATE_ESTIMATOR_H_ | |
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