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1 /* | 1 /* |
2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 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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32 void SetStartBitrate(int start_bitrate_bps); | 32 void SetStartBitrate(int start_bitrate_bps); |
33 void SetMinBitrate(int min_bitrate_bps); | 33 void SetMinBitrate(int min_bitrate_bps); |
34 int64_t GetFeedbackInterval() const; | 34 int64_t GetFeedbackInterval() const; |
35 // Returns true if the bitrate estimate hasn't been changed for more than | 35 // Returns true if the bitrate estimate hasn't been changed for more than |
36 // an RTT, or if the incoming_bitrate is less than half of the current | 36 // an RTT, or if the incoming_bitrate is less than half of the current |
37 // estimate. Should be used to decide if we should reduce the rate further | 37 // estimate. Should be used to decide if we should reduce the rate further |
38 // when over-using. | 38 // when over-using. |
39 bool TimeToReduceFurther(int64_t time_now, | 39 bool TimeToReduceFurther(int64_t time_now, |
40 uint32_t incoming_bitrate_bps) const; | 40 uint32_t incoming_bitrate_bps) const; |
41 uint32_t LatestEstimate() const; | 41 uint32_t LatestEstimate() const; |
42 uint32_t UpdateBandwidthEstimate(int64_t now_ms); | |
43 void SetRtt(int64_t rtt); | 42 void SetRtt(int64_t rtt); |
44 void Update(const RateControlInput* input, int64_t now_ms); | 43 uint32_t Update(const RateControlInput* input, int64_t now_ms); |
45 void SetEstimate(int bitrate_bps, int64_t now_ms); | 44 void SetEstimate(int bitrate_bps, int64_t now_ms); |
46 | 45 |
47 // Returns the increase rate which is used when used bandwidth is near the | 46 // Returns the increase rate which is used when used bandwidth is near the |
48 // maximal available bandwidth. | 47 // maximal available bandwidth. |
49 virtual int GetNearMaxIncreaseRateBps() const; | 48 virtual int GetNearMaxIncreaseRateBps() const; |
50 | 49 |
51 virtual rtc::Optional<int> GetLastBitrateDecreaseBps() const; | 50 virtual rtc::Optional<int> GetLastBitrateDecreaseBps() const; |
52 | 51 |
53 private: | 52 private: |
54 // Update the target bitrate according based on, among other things, | 53 // Update the target bitrate according based on, among other things, |
55 // the current rate control state, the current target bitrate and the incoming | 54 // the current rate control state, the current target bitrate and the incoming |
56 // bitrate. When in the "increase" state the bitrate will be increased either | 55 // bitrate. When in the "increase" state the bitrate will be increased either |
57 // additively or multiplicatively depending on the rate control region. When | 56 // additively or multiplicatively depending on the rate control region. When |
58 // in the "decrease" state the bitrate will be decreased to slightly below the | 57 // in the "decrease" state the bitrate will be decreased to slightly below the |
59 // incoming bitrate. When in the "hold" state the bitrate will be kept | 58 // incoming bitrate. When in the "hold" state the bitrate will be kept |
60 // constant to allow built up queues to drain. | 59 // constant to allow built up queues to drain. |
61 uint32_t ChangeBitrate(uint32_t current_bitrate, | 60 uint32_t ChangeBitrate(uint32_t current_bitrate, |
62 uint32_t incoming_bitrate, | 61 const RateControlInput& input, |
63 int64_t now_ms); | 62 int64_t now_ms); |
64 // Clamps new_bitrate_bps to within the configured min bitrate and a linear | 63 // Clamps new_bitrate_bps to within the configured min bitrate and a linear |
65 // function of the incoming bitrate, so that the new bitrate can't grow too | 64 // function of the incoming bitrate, so that the new bitrate can't grow too |
66 // large compared to the bitrate actually being received by the other end. | 65 // large compared to the bitrate actually being received by the other end. |
67 uint32_t ClampBitrate(uint32_t new_bitrate_bps, | 66 uint32_t ClampBitrate(uint32_t new_bitrate_bps, |
68 uint32_t incoming_bitrate_bps) const; | 67 uint32_t incoming_bitrate_bps) const; |
69 uint32_t MultiplicativeRateIncrease(int64_t now_ms, int64_t last_ms, | 68 uint32_t MultiplicativeRateIncrease(int64_t now_ms, int64_t last_ms, |
70 uint32_t current_bitrate_bps) const; | 69 uint32_t current_bitrate_bps) const; |
71 uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms) const; | 70 uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms) const; |
72 void UpdateChangePeriod(int64_t now_ms); | 71 void UpdateChangePeriod(int64_t now_ms); |
73 void UpdateMaxBitRateEstimate(float incoming_bit_rate_kbps); | 72 void UpdateMaxBitRateEstimate(float incoming_bit_rate_kbps); |
74 void ChangeState(const RateControlInput& input, int64_t now_ms); | 73 void ChangeState(const RateControlInput& input, int64_t now_ms); |
75 void ChangeState(RateControlState new_state); | |
76 void ChangeRegion(RateControlRegion region); | 74 void ChangeRegion(RateControlRegion region); |
77 | 75 |
78 uint32_t min_configured_bitrate_bps_; | 76 uint32_t min_configured_bitrate_bps_; |
79 uint32_t max_configured_bitrate_bps_; | 77 uint32_t max_configured_bitrate_bps_; |
80 uint32_t current_bitrate_bps_; | 78 uint32_t current_bitrate_bps_; |
81 float avg_max_bitrate_kbps_; | 79 float avg_max_bitrate_kbps_; |
82 float var_max_bitrate_kbps_; | 80 float var_max_bitrate_kbps_; |
83 RateControlState rate_control_state_; | 81 RateControlState rate_control_state_; |
84 RateControlRegion rate_control_region_; | 82 RateControlRegion rate_control_region_; |
85 int64_t time_last_bitrate_change_; | 83 int64_t time_last_bitrate_change_; |
86 RateControlInput current_input_; | |
87 bool updated_; | |
88 int64_t time_first_incoming_estimate_; | 84 int64_t time_first_incoming_estimate_; |
89 bool bitrate_is_initialized_; | 85 bool bitrate_is_initialized_; |
90 float beta_; | 86 float beta_; |
91 int64_t rtt_; | 87 int64_t rtt_; |
92 bool in_experiment_; | 88 bool in_experiment_; |
93 rtc::Optional<int> last_decrease_; | 89 rtc::Optional<int> last_decrease_; |
94 }; | 90 }; |
95 } // namespace webrtc | 91 } // namespace webrtc |
96 | 92 |
97 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ | 93 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ |
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