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      1 /*
      2  *  Copyright (c) 2015 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 
     11 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_PACKET_LOSS_STATS_H_
     12 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_PACKET_LOSS_STATS_H_
     13 
     14 #include <stdint.h>
     15 #include <set>
     16 
     17 namespace webrtc {
     18 
     19 // Keeps track of statistics of packet loss including whether losses are a
     20 // single packet or multiple packets in a row.
     21 class PacketLossStats {
     22  public:
     23   PacketLossStats();
     24   ~PacketLossStats() {}
     25 
     26   // Adds a lost packet to the stats by sequence number.
     27   void AddLostPacket(uint16_t sequence_number);
     28 
     29   // Queries the number of packets that were lost by themselves, no neighboring
     30   // packets were lost.
     31   int GetSingleLossCount() const;
     32 
     33   // Queries the number of times that multiple packets with sequential numbers
     34   // were lost. This is the number of events with more than one packet lost,
     35   // regardless of the size of the event;
     36   int GetMultipleLossEventCount() const;
     37 
     38   // Queries the number of packets lost in multiple packet loss events. Combined
     39   // with the event count, this can be used to determine the average event size.
     40   int GetMultipleLossPacketCount() const;
     41 
     42  private:
     43   std::set<uint16_t> lost_packets_buffer_;
     44   std::set<uint16_t> lost_packets_wrapped_buffer_;
     45   int single_loss_historic_count_;
     46   int multiple_loss_historic_event_count_;
     47   int multiple_loss_historic_packet_count_;
     48 
     49   void ComputeLossCounts(int* out_single_loss_count,
     50                          int* out_multiple_loss_event_count,
     51                          int* out_multiple_loss_packet_count) const;
     52   void PruneBuffer();
     53 };
     54 
     55 }  // namespace webrtc
     56 
     57 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_PACKET_LOSS_STATS_H_
     58