Start integrating StatsCounter class.

webrtc/video/send_delay_stats.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_VIDEO_SEND_DELAY_STATS_H_
 #define WEBRTC_VIDEO_SEND_DELAY_STATS_H_
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/system_wrappers/include/clock.h"
+#include "webrtc/video/stats_counter.h"
 #include "webrtc/video_send_stream.h"
 
 namespace webrtc {
 
 class SendDelayStats : public SendPacketObserver {
  public:
   explicit SendDelayStats(Clock* clock);
   virtual ~SendDelayStats();
 
   // Adds the configured ssrcs for the rtp streams.
@@ skipping 21 matching lines @@
     Packet(uint32_t ssrc, int64_t capture_time_ms, int64_t send_time_ms)
         : ssrc(ssrc),
           capture_time_ms(capture_time_ms),
           send_time_ms(send_time_ms) {}
     uint32_t ssrc;
     int64_t capture_time_ms;
     int64_t send_time_ms;
   };
   typedef std::map<uint16_t, Packet, SequenceNumberOlderThan> PacketMap;
 
-  class SampleCounter {
-   public:
-    SampleCounter() : sum(0), num_samples(0) {}
-    ~SampleCounter() {}
-    void Add(int sample);
-    int Avg(int min_required_samples) const;
-
-   private:
-    int sum;
-    int num_samples;
-  };
-
   void UpdateHistograms();
   void RemoveOld(int64_t now, PacketMap* packets)
       EXCLUSIVE_LOCKS_REQUIRED(crit_);
+  AvgCounter* GetSendDelayCounter(uint32_t ssrc)
+      EXCLUSIVE_LOCKS_REQUIRED(crit_);
 
   Clock* const clock_;
   rtc::CriticalSection crit_;
 
   PacketMap packets_ GUARDED_BY(crit_);
   size_t num_old_packets_ GUARDED_BY(crit_);
   size_t num_skipped_packets_ GUARDED_BY(crit_);
 
   std::set<uint32_t> ssrcs_ GUARDED_BY(crit_);
-  std::map<uint32_t, SampleCounter> send_delay_counters_
-      GUARDED_BY(crit_);  // Mapped by SSRC.
+
+  // Mapped by SSRC.
+  std::map<uint32_t, std::unique_ptr<AvgCounter>> send_delay_counters_
+      GUARDED_BY(crit_);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_SEND_DELAY_STATS_H_