Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/neteq/preemptive_expand.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.
  */
 
@@ skipping 14 matching lines @@
 
 // This class implements the PreemptiveExpand operation. Most of the work is
 // done in the base class TimeStretch, which is shared with the Accelerate
 // operation. In the PreemptiveExpand class, the operations that are specific to
 // PreemptiveExpand are implemented.
 class PreemptiveExpand : public TimeStretch {
  public:
   PreemptiveExpand(int sample_rate_hz,
                    size_t num_channels,
                    const BackgroundNoise& background_noise,
-                   int overlap_samples)
+                   size_t overlap_samples)
       : TimeStretch(sample_rate_hz, num_channels, background_noise),
-        old_data_length_per_channel_(-1),
+        old_data_length_per_channel_(0),
         overlap_samples_(overlap_samples) {
   }
 
   // This method performs the actual PreemptiveExpand operation. The samples are
   // read from |input|, of length |input_length| elements, and are written to
   // |output|. The number of samples added through time-stretching is
   // is provided in the output |length_change_samples|. The method returns
   // the outcome of the operation as an enumerator value.
   ReturnCodes Process(const int16_t *pw16_decoded,
-                      int len,
-                      int old_data_len,
+                      size_t len,
+                      size_t old_data_len,
                       AudioMultiVector* output,
-                      int16_t* length_change_samples);
+                      size_t* length_change_samples);
 
  protected:
   // Sets the parameters |best_correlation| and |peak_index| to suitable
   // values when the signal contains no active speech.
   void SetParametersForPassiveSpeech(size_t input_length,
                                      int16_t* best_correlation,
-                                     int* peak_index) const override;
+                                     size_t* peak_index) const override;
 
   // Checks the criteria for performing the time-stretching operation and,
   // if possible, performs the time-stretching.
   ReturnCodes CheckCriteriaAndStretch(const int16_t* input,
                                       size_t input_length,
                                       size_t peak_index,
                                       int16_t best_correlation,
                                       bool active_speech,
                                       bool /*fast_mode*/,
                                       AudioMultiVector* output) const override;
 
  private:
-  int old_data_length_per_channel_;
-  int overlap_samples_;
+  size_t old_data_length_per_channel_;
+  size_t overlap_samples_;
 
   DISALLOW_COPY_AND_ASSIGN(PreemptiveExpand);
 };
 
 struct PreemptiveExpandFactory {
   PreemptiveExpandFactory() {}
   virtual ~PreemptiveExpandFactory() {}
 
   virtual PreemptiveExpand* Create(
       int sample_rate_hz,
       size_t num_channels,
       const BackgroundNoise& background_noise,
-      int overlap_samples) const;
+      size_t overlap_samples) const;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_PREEMPTIVE_EXPAND_H_