Add ToString method to AggregatedStats and log stats at the end of a call.

webrtc/video/stats_counter.cc

 /*
  *  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.
  */
 
 #include "webrtc/video/stats_counter.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
 
 namespace {
 // Default periodic time interval for processing samples.
 const int64_t kDefaultProcessIntervalMs = 2000;
 const uint32_t kStreamId0 = 0;
 }  // namespace
 
+std::string AggregatedStats::ToString() const {
+  std::stringstream ss;
+  ss << "periodic_samples:" << num_samples << ", {";
+  ss << "min:" << min << ", ";
+  ss << "avg:" << average << ", ";
+  ss << "max:" << max << "}";
+  return ss.str();
+}
+
 // Class holding periodically computed metrics.
 class AggregatedCounter {
  public:
   AggregatedCounter() : last_sample_(0), sum_samples_(0) {}
   ~AggregatedCounter() {}
 
   void Add(int sample) {
     last_sample_ = sample;
     sum_samples_ += sample;
     ++stats_.num_samples;
@@ skipping 358 matching lines @@
 
   *metric = (diff * 1000 + process_intervals_ms_ / 2) / process_intervals_ms_;
   return true;
 }
 
 int RateAccCounter::GetValueForEmptyInterval() const {
   return 0;
 }
 
 }  // namespace webrtc