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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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41 : updated(true), probe(probe), target_bitrate_bps(target_bitrate_bps) {} | 41 : updated(true), probe(probe), target_bitrate_bps(target_bitrate_bps) {} |
42 bool updated; | 42 bool updated; |
43 bool probe; | 43 bool probe; |
44 uint32_t target_bitrate_bps; | 44 uint32_t target_bitrate_bps; |
45 }; | 45 }; |
46 | 46 |
47 DelayBasedBwe(RtcEventLog* event_log, const Clock* clock); | 47 DelayBasedBwe(RtcEventLog* event_log, const Clock* clock); |
48 virtual ~DelayBasedBwe(); | 48 virtual ~DelayBasedBwe(); |
49 | 49 |
50 Result IncomingPacketFeedbackVector( | 50 Result IncomingPacketFeedbackVector( |
51 const std::vector<PacketFeedback>& packet_feedback_vector, | 51 const std::vector<PacketFeedback>& packet_feedback_vector); |
52 rtc::Optional<uint32_t> acked_bitrate_bps); | |
53 void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms); | 52 void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms); |
54 bool LatestEstimate(std::vector<uint32_t>* ssrcs, | 53 bool LatestEstimate(std::vector<uint32_t>* ssrcs, |
55 uint32_t* bitrate_bps) const; | 54 uint32_t* bitrate_bps) const; |
56 void SetStartBitrate(int start_bitrate_bps); | 55 void SetStartBitrate(int start_bitrate_bps); |
57 void SetMinBitrate(int min_bitrate_bps); | 56 void SetMinBitrate(int min_bitrate_bps); |
58 int64_t GetExpectedBwePeriodMs() const; | 57 int64_t GetExpectedBwePeriodMs() const; |
59 | 58 |
60 private: | 59 private: |
| 60 // Computes a bayesian estimate of the throughput given acks containing |
| 61 // the arrival time and payload size. Samples which are far from the current |
| 62 // estimate or are based on few packets are given a smaller weight, as they |
| 63 // are considered to be more likely to have been caused by, e.g., delay spikes |
| 64 // unrelated to congestion. |
| 65 class BitrateEstimator { |
| 66 public: |
| 67 BitrateEstimator(); |
| 68 void Update(int64_t now_ms, int bytes); |
| 69 rtc::Optional<uint32_t> bitrate_bps() const; |
| 70 |
| 71 private: |
| 72 float UpdateWindow(int64_t now_ms, int bytes, int rate_window_ms); |
| 73 int sum_; |
| 74 int64_t current_win_ms_; |
| 75 int64_t prev_time_ms_; |
| 76 float bitrate_estimate_; |
| 77 float bitrate_estimate_var_; |
| 78 }; |
| 79 |
61 void IncomingPacketFeedback(const PacketFeedback& packet_feedback); | 80 void IncomingPacketFeedback(const PacketFeedback& packet_feedback); |
62 Result OnLongFeedbackDelay(int64_t arrival_time_ms); | 81 Result OnLongFeedbackDelay(int64_t arrival_time_ms); |
63 | 82 |
64 Result MaybeUpdateEstimate(bool overusing, | 83 Result MaybeUpdateEstimate(bool overusing); |
65 rtc::Optional<uint32_t> acked_bitrate_bps); | |
66 // Updates the current remote rate estimate and returns true if a valid | 84 // Updates the current remote rate estimate and returns true if a valid |
67 // estimate exists. | 85 // estimate exists. |
68 bool UpdateEstimate(int64_t now_ms, | 86 bool UpdateEstimate(int64_t now_ms, |
69 rtc::Optional<uint32_t> acked_bitrate_bps, | 87 rtc::Optional<uint32_t> acked_bitrate_bps, |
70 bool overusing, | 88 bool overusing, |
71 uint32_t* target_bitrate_bps); | 89 uint32_t* target_bitrate_bps); |
72 | 90 |
73 rtc::ThreadChecker network_thread_; | 91 rtc::ThreadChecker network_thread_; |
74 RtcEventLog* const event_log_; | 92 RtcEventLog* const event_log_; |
75 const Clock* const clock_; | 93 const Clock* const clock_; |
76 std::unique_ptr<InterArrival> inter_arrival_; | 94 std::unique_ptr<InterArrival> inter_arrival_; |
77 std::unique_ptr<TrendlineEstimator> trendline_estimator_; | 95 std::unique_ptr<TrendlineEstimator> trendline_estimator_; |
78 OveruseDetector detector_; | 96 OveruseDetector detector_; |
| 97 BitrateEstimator receiver_incoming_bitrate_; |
79 int64_t last_seen_packet_ms_; | 98 int64_t last_seen_packet_ms_; |
80 bool uma_recorded_; | 99 bool uma_recorded_; |
81 AimdRateControl rate_control_; | 100 AimdRateControl rate_control_; |
82 ProbeBitrateEstimator probe_bitrate_estimator_; | 101 ProbeBitrateEstimator probe_bitrate_estimator_; |
83 size_t trendline_window_size_; | 102 size_t trendline_window_size_; |
84 double trendline_smoothing_coeff_; | 103 double trendline_smoothing_coeff_; |
85 double trendline_threshold_gain_; | 104 double trendline_threshold_gain_; |
86 int consecutive_delayed_feedbacks_; | 105 int consecutive_delayed_feedbacks_; |
87 uint32_t last_logged_bitrate_; | 106 uint32_t last_logged_bitrate_; |
88 BandwidthUsage last_logged_state_; | 107 BandwidthUsage last_logged_state_; |
89 bool in_sparse_update_experiment_; | 108 bool in_sparse_update_experiment_; |
90 | 109 |
91 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe); | 110 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe); |
92 }; | 111 }; |
93 | 112 |
94 } // namespace webrtc | 113 } // namespace webrtc |
95 | 114 |
96 #endif // WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_ | 115 #endif // WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_ |
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