Update audio code to use size_t more correctly,

webrtc/modules/audio_processing/vad/standalone_vad.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 23 matching lines @@
   //     0: in success.
   // In case of error the content of |activity| is unchanged.
   //
   // Note that due to a high false-positive (VAD decision is active while the
   // processed audio is just background noise) rate, stand-alone VAD is used as
   // a one-sided indicator. The activity probability is 0.5 if the frame is
   // classified as active, and the probability is 0.01 if the audio is
   // classified as passive. In this way, when probabilities are combined, the
   // effect of the stand-alone VAD is neutral if the input is classified as
   // active.
-  int GetActivity(double* p, int length_p);
+  int GetActivity(double* p, size_t length_p);
 
   // Expecting 10 ms of 16 kHz audio to be pushed in.
-  int AddAudio(const int16_t* data, int length);
+  int AddAudio(const int16_t* data, size_t length);
 
   // Set aggressiveness of VAD, 0 is the least aggressive and 3 is the most
   // aggressive mode. Returns -1 if the input is less than 0 or larger than 3,
   // otherwise 0 is returned.
   int set_mode(int mode);
   // Get the agressiveness of the current VAD.
   int mode() const { return mode_; }
 
  private:
   explicit StandaloneVad(VadInst* vad);
 
-  static const int kMaxNum10msFrames = 3;
+  static const size_t kMaxNum10msFrames = 3;
 
   // TODO(turajs): Is there a way to use scoped-pointer here?
   VadInst* vad_;
   int16_t buffer_[kMaxNum10msFrames * kLength10Ms];
-  int index_;
+  size_t index_;
   int mode_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_