NetEq: Fix a bug in expand_rate and speech_expand_rate calculation

webrtc/modules/audio_coding/neteq/statistics_calculator.h

 /*
  *  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 27 matching lines @@
   void ResetMcu();
 
   // Reports that |num_samples| samples were produced through expansion, and
   // that the expansion produced other than just noise samples.
   void ExpandedVoiceSamples(size_t num_samples);
 
   // Reports that |num_samples| samples were produced through expansion, and
   // that the expansion produced only noise samples.
   void ExpandedNoiseSamples(size_t num_samples);
 
+  // Corrects the statistics for number of samples produced through non-noise
+  // expansion by adding |num_samples| (negative or positive) to the current
+  // value. The result is capped to zero to avoid negative values.
+  void ExpandedVoiceSamplesCorrection(int num_samples);
+
+  // Same as ExpandedVoiceSamplesCorrection but for noise samples.
+  void ExpandedNoiseSamplesCorrection(int num_samples);
+
   // Reports that |num_samples| samples were produced through preemptive
   // expansion.
   void PreemptiveExpandedSamples(size_t num_samples);
 
   // Reports that |num_samples| samples were removed through accelerate.
   void AcceleratedSamples(size_t num_samples);
 
   // Reports that |num_samples| zeros were inserted into the output.
   void AddZeros(size_t num_samples);
 
@@ skipping 100 matching lines @@
   std::deque<int> waiting_times_;
   uint32_t secondary_decoded_samples_;
   PeriodicUmaCount delayed_packet_outage_counter_;
   PeriodicUmaAverage excess_buffer_delay_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(StatisticsCalculator);
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_STATISTICS_CALCULATOR_H_