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91 lines
3.9 KiB
C++
91 lines
3.9 KiB
C++
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_
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#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_
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#include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
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#include "webrtc/modules/remote_bitrate_estimator/remote_rate_control.h"
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namespace webrtc {
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// A RemoteRateControl implementation based on additive increases of
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// bitrate when no over-use is detected and multiplicative decreases when
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// over-uses are detected. When we think the available bandwidth has changes or
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// is unknown, we will switch to a "slow-start mode" where we increase
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// multiplicatively.
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class AimdRateControl : public RemoteRateControl {
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public:
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explicit AimdRateControl(uint32_t min_bitrate_bps);
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virtual ~AimdRateControl() {}
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// Implements RemoteRateControl.
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bool ValidEstimate() const override;
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RateControlType GetControlType() const override;
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uint32_t GetMinBitrate() const override;
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int64_t GetFeedbackInterval() const override;
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// Returns true if the bitrate estimate hasn't been changed for more than
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// an RTT, or if the incoming_bitrate is more than 5% above the current
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// estimate. Should be used to decide if we should reduce the rate further
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// when over-using.
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bool TimeToReduceFurther(int64_t time_now,
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uint32_t incoming_bitrate_bps) const override;
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uint32_t LatestEstimate() const override;
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uint32_t UpdateBandwidthEstimate(int64_t now_ms) override;
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void SetRtt(int64_t rtt) override;
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RateControlRegion Update(const RateControlInput* input,
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int64_t now_ms) override;
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void SetEstimate(int bitrate_bps, int64_t now_ms) override;
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private:
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// Update the target bitrate according based on, among other things,
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// the current rate control state, the current target bitrate and the incoming
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// bitrate. When in the "increase" state the bitrate will be increased either
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// additively or multiplicatively depending on the rate control region. When
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// in the "decrease" state the bitrate will be decreased to slightly below the
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// incoming bitrate. When in the "hold" state the bitrate will be kept
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// constant to allow built up queues to drain.
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uint32_t ChangeBitrate(uint32_t current_bit_rate,
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uint32_t incoming_bit_rate,
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int64_t now_ms);
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uint32_t MultiplicativeRateIncrease(int64_t now_ms, int64_t last_ms,
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uint32_t current_bitrate_bps) const;
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uint32_t AdditiveRateIncrease(int64_t now_ms, int64_t last_ms,
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int64_t response_time_ms) const;
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void UpdateChangePeriod(int64_t now_ms);
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void UpdateMaxBitRateEstimate(float incoming_bit_rate_kbps);
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void ChangeState(const RateControlInput& input, int64_t now_ms);
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void ChangeState(RateControlState new_state);
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void ChangeRegion(RateControlRegion region);
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uint32_t min_configured_bitrate_bps_;
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uint32_t max_configured_bitrate_bps_;
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uint32_t current_bitrate_bps_;
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uint32_t max_hold_rate_bps_;
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float avg_max_bitrate_kbps_;
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float var_max_bitrate_kbps_;
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RateControlState rate_control_state_;
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RateControlState came_from_state_;
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RateControlRegion rate_control_region_;
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int64_t time_last_bitrate_change_;
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RateControlInput current_input_;
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bool updated_;
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int64_t time_first_incoming_estimate_;
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bool bitrate_is_initialized_;
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float beta_;
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int64_t rtt_;
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int64_t time_of_last_log_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(AimdRateControl);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_AIMD_RATE_CONTROL_H_
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