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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 |
11 #ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ | 11 #ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ |
12 #define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ | 12 #define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ |
13 | 13 |
14 #include "webrtc/base/constructormagic.h" | 14 #include "webrtc/base/constructormagic.h" |
15 #include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h" | 15 #include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h" |
16 | 16 |
17 namespace webrtc { | 17 namespace webrtc { |
18 | 18 |
19 // A rate control implementation based on additive increases of | 19 // A rate control implementation based on additive increases of |
20 // bitrate when no over-use is detected and multiplicative decreases when | 20 // bitrate when no over-use is detected and multiplicative decreases when |
21 // over-uses are detected. When we think the available bandwidth has changes or | 21 // over-uses are detected. When we think the available bandwidth has changes or |
22 // is unknown, we will switch to a "slow-start mode" where we increase | 22 // is unknown, we will switch to a "slow-start mode" where we increase |
23 // multiplicatively. | 23 // multiplicatively. |
24 class AimdRateControl { | 24 class AimdRateControl { |
25 public: | 25 public: |
26 AimdRateControl(); | 26 AimdRateControl(); |
27 virtual ~AimdRateControl() {} | 27 virtual ~AimdRateControl(); |
28 | 28 |
29 // Returns true if there is a valid estimate of the incoming bitrate, false | 29 // Returns true if there is a valid estimate of the incoming bitrate, false |
30 // otherwise. | 30 // otherwise. |
31 bool ValidEstimate() const; | 31 bool ValidEstimate() const; |
| 32 void SetStartBitrate(int start_bitrate_bps); |
32 void SetMinBitrate(int min_bitrate_bps); | 33 void SetMinBitrate(int min_bitrate_bps); |
33 int64_t GetFeedbackInterval() const; | 34 int64_t GetFeedbackInterval() const; |
34 // 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 |
35 // 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 |
36 // 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 |
37 // when over-using. | 38 // when over-using. |
38 bool TimeToReduceFurther(int64_t time_now, | 39 bool TimeToReduceFurther(int64_t time_now, |
39 uint32_t incoming_bitrate_bps) const; | 40 uint32_t incoming_bitrate_bps) const; |
40 uint32_t LatestEstimate() const; | 41 uint32_t LatestEstimate() const; |
41 uint32_t UpdateBandwidthEstimate(int64_t now_ms); | 42 uint32_t UpdateBandwidthEstimate(int64_t now_ms); |
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82 int64_t time_first_incoming_estimate_; | 83 int64_t time_first_incoming_estimate_; |
83 bool bitrate_is_initialized_; | 84 bool bitrate_is_initialized_; |
84 float beta_; | 85 float beta_; |
85 int64_t rtt_; | 86 int64_t rtt_; |
86 bool in_experiment_; | 87 bool in_experiment_; |
87 rtc::Optional<int> last_decrease_; | 88 rtc::Optional<int> last_decrease_; |
88 }; | 89 }; |
89 } // namespace webrtc | 90 } // namespace webrtc |
90 | 91 |
91 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ | 92 #endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_ |
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