Remote Bitrate Estimator

Abstract

Remote Bitrate Estimator

Authors

Walter Fan

Status

WIP

Updated

2024-08-21

Overview

Classes

带宽的使用情况

enum class BandwidthUsage {
    kBwNormal = 0,
    kBwUnderusing = 1,
    kBwOverusing = 2,
    kLast
};

Code

class RemoteBitrateEstimator : public CallStatsObserver, public Module {
 public:
     ~RemoteBitrateEstimator() override {}
     // 在接收每一个包时调用，更新接收荷载比特率估计和过度使用检测器
     // 如果检测到了过度使用，远端比特率估计将被更新
     // 注意 `payload_size` 是指不包含包头的包长度
     // 注意 `arrival_time_ms` 可以基于任何时间基准

     virtual void IncomingPacket(int64_t arrival_time_ms,
                             size_t payload_size,
                             const RTPHeader& header) = 0;

     // 移除 `ssrc` 所标识的流的所有数据
     virtual void RemoveStream(uint32_t ssrc) = 0;

     // 返回 true if a valid estimate exists and sets `bitrate_bps` to the
     // estimated payload bitrate in bits per second. `ssrcs` is the list of ssrcs
     // currently being received and of which the bitrate estimate is based upon.
     virtual bool LatestEstimate(std::vector<uint32_t>* ssrcs,
                             uint32_t* bitrate_bps) const = 0;

     virtual void SetMinBitrate(int min_bitrate_bps) = 0;

 protected:
     static const int64_t kProcessIntervalMs = 500;
     static const int64_t kStreamTimeOutMs = 2000;
 };

Reference