Reland of Merge webrtc/video_engine/ into webrtc/video/

webrtc/video_engine/call_stats.h

-/*
- *  Copyright (c) 2012 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_ENGINE_CALL_STATS_H_
-#define WEBRTC_VIDEO_ENGINE_CALL_STATS_H_
-
-#include <list>
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/base/scoped_ptr.h"
-#include "webrtc/modules/include/module.h"
-#include "webrtc/system_wrappers/include/clock.h"
-
-namespace webrtc {
-
-class CallStatsObserver;
-class CriticalSectionWrapper;
-class RtcpRttStats;
-
-// CallStats keeps track of statistics for a call.
-class CallStats : public Module {
- public:
-  friend class RtcpObserver;
-
-  explicit CallStats(Clock* clock);
-  ~CallStats();
-
-  // Implements Module, to use the process thread.
-  int64_t TimeUntilNextProcess() override;
-  int32_t Process() override;
-
-  // Returns a RtcpRttStats to register at a statistics provider. The object
-  // has the same lifetime as the CallStats instance.
-  RtcpRttStats* rtcp_rtt_stats() const;
-
-  // Registers/deregisters a new observer to receive statistics updates.
-  void RegisterStatsObserver(CallStatsObserver* observer);
-  void DeregisterStatsObserver(CallStatsObserver* observer);
-
-  // Helper struct keeping track of the time a rtt value is reported.
-  struct RttTime {
-    RttTime(int64_t new_rtt, int64_t rtt_time)
-        : rtt(new_rtt), time(rtt_time) {}
-    const int64_t rtt;
-    const int64_t time;
-  };
-
- protected:
-  void OnRttUpdate(int64_t rtt);
-
-  int64_t avg_rtt_ms() const;
-
- private:
-  Clock* const clock_;
-  // Protecting all members.
-  rtc::scoped_ptr<CriticalSectionWrapper> crit_;
-  // Observer receiving statistics updates.
-  rtc::scoped_ptr<RtcpRttStats> rtcp_rtt_stats_;
-  // The last time 'Process' resulted in statistic update.
-  int64_t last_process_time_;
-  // The last RTT in the statistics update (zero if there is no valid estimate).
-  int64_t max_rtt_ms_;
-  int64_t avg_rtt_ms_;
-
-  // All Rtt reports within valid time interval, oldest first.
-  std::list<RttTime> reports_;
-
-  // Observers getting stats reports.
-  std::list<CallStatsObserver*> observers_;
-
-  RTC_DISALLOW_COPY_AND_ASSIGN(CallStats);
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_VIDEO_ENGINE_CALL_STATS_H_