Use RateCounter for received bitrate stats.

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.
  */
 
@@ skipping 56 matching lines @@
       observer_(observer),
       aggregated_counter_(new AggregatedCounter()),
       last_process_time_ms_(-1) {}
 
 StatsCounter::~StatsCounter() {}
 
 AggregatedStats StatsCounter::GetStats() {
   return aggregated_counter_->ComputeStats();
 }
 
+bool StatsCounter::HasSample() const {
+  return last_process_time_ms_ != -1;
+}
+
 bool StatsCounter::TimeToProcess() {
   int64_t now = clock_->TimeInMilliseconds();
   if (last_process_time_ms_ == -1)
     last_process_time_ms_ = now;
 
   int64_t diff_ms = now - last_process_time_ms_;
   if (diff_ms < kProcessIntervalMs)
     return false;
 
   // Advance number of complete kProcessIntervalMs that have passed.
@@ skipping 135 matching lines @@
 
 bool RateAccCounter::GetMetric(int* metric) const {
   if (num_samples_ == 0 || last_sum_ > sum_)
     return false;
   *metric =
       ((sum_ - last_sum_) * 1000 + kProcessIntervalMs / 2) / kProcessIntervalMs;
   return true;
 }
 
 }  // namespace webrtc