Fix div-by-0 in NetEq's StatisticsCalculator

webrtc/modules/audio_coding/neteq/statistics_calculator.cc

 /*
  *  Copyright (c) 2013 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 77 matching lines @@
   // Log the average for the current (incomplete) interval.
   LogToUma(Metric());
 }
 
 void StatisticsCalculator::PeriodicUmaAverage::RegisterSample(int value) {
   sum_ += value;
   ++counter_;
 }
 
 int StatisticsCalculator::PeriodicUmaAverage::Metric() const {
-  return static_cast<int>(sum_ / counter_);
+  return counter_ == 0 ? 0 : static_cast<int>(sum_ / counter_);
 }
 
 void StatisticsCalculator::PeriodicUmaAverage::Reset() {
   sum_ = 0.0;
   counter_ = 0;
 }
 
 StatisticsCalculator::StatisticsCalculator()
     : preemptive_samples_(0),
       accelerate_samples_(0),
@@ skipping 178 matching lines @@
     // Ratio must be smaller than 1 in Q14.
     assert((numerator << 14) / denominator < (1 << 14));
     return static_cast<uint16_t>((numerator << 14) / denominator);
   } else {
     // Will not produce a ratio larger than 1, since this is probably an error.
     return 1 << 14;
   }
 }
 
 }  // namespace webrtc