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      1 /*
      2  *  Copyright (c) 2012 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  *  FEC and NACK added bitrate is handled outside class
     11  */
     12 
     13 #ifndef WEBRTC_MODULES_BITRATE_CONTROLLER_SEND_SIDE_BANDWIDTH_ESTIMATION_H_
     14 #define WEBRTC_MODULES_BITRATE_CONTROLLER_SEND_SIDE_BANDWIDTH_ESTIMATION_H_
     15 
     16 #include <deque>
     17 
     18 #include "webrtc/modules/rtp_rtcp/interface/rtp_rtcp_defines.h"
     19 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
     20 
     21 namespace webrtc {
     22 class SendSideBandwidthEstimation {
     23  public:
     24   SendSideBandwidthEstimation();
     25   virtual ~SendSideBandwidthEstimation();
     26 
     27   void CurrentEstimate(uint32_t* bitrate, uint8_t* loss, uint32_t* rtt) const;
     28 
     29   // Call periodically to update estimate.
     30   void UpdateEstimate(uint32_t now_ms);
     31 
     32   // Call when we receive a RTCP message with TMMBR or REMB.
     33   void UpdateReceiverEstimate(uint32_t bandwidth);
     34 
     35   // Call when we receive a RTCP message with a ReceiveBlock.
     36   void UpdateReceiverBlock(uint8_t fraction_loss,
     37                            uint32_t rtt,
     38                            int number_of_packets,
     39                            uint32_t now_ms);
     40 
     41   void SetSendBitrate(uint32_t bitrate);
     42   void SetMinMaxBitrate(uint32_t min_bitrate, uint32_t max_bitrate);
     43   void SetMinBitrate(uint32_t min_bitrate);
     44 
     45  private:
     46   void CapBitrateToThresholds();
     47 
     48   // Updates history of min bitrates.
     49   // After this method returns min_bitrate_history_.front().second contains the
     50   // min bitrate used during last kBweIncreaseIntervalMs.
     51   void UpdateMinHistory(uint32_t now_ms);
     52 
     53   std::deque<std::pair<uint32_t, uint32_t> > min_bitrate_history_;
     54 
     55   // incoming filters
     56   int accumulate_lost_packets_Q8_;
     57   int accumulate_expected_packets_;
     58 
     59   uint32_t bitrate_;
     60   uint32_t min_bitrate_configured_;
     61   uint32_t max_bitrate_configured_;
     62 
     63   uint32_t time_last_receiver_block_ms_;
     64   uint8_t last_fraction_loss_;
     65   uint16_t last_round_trip_time_ms_;
     66 
     67   uint32_t bwe_incoming_;
     68   uint32_t time_last_decrease_ms_;
     69 };
     70 }  // namespace webrtc
     71 #endif  // WEBRTC_MODULES_BITRATE_CONTROLLER_SEND_SIDE_BANDWIDTH_ESTIMATION_H_
     72