Update audio code to use size_t more correctly,

webrtc/modules/audio_processing/vad/standalone_vad.cc

 /*
  *  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 24 matching lines @@
 
   int err = WebRtcVad_Init(vad);
   err |= WebRtcVad_set_mode(vad, kDefaultStandaloneVadMode);
   if (err != 0) {
     WebRtcVad_Free(vad);
     return nullptr;
   }
   return new StandaloneVad(vad);
 }
 
-int StandaloneVad::AddAudio(const int16_t* data, int length) {
+int StandaloneVad::AddAudio(const int16_t* data, size_t length) {
   if (length != kLength10Ms)
     return -1;
 
   if (index_ + length > kLength10Ms * kMaxNum10msFrames)
     // Reset the buffer if it's full.
     // TODO(ajm): Instead, consider just processing every 10 ms frame. Then we
     // can forgo the buffering.
     index_ = 0;
 
   memcpy(&buffer_[index_], data, sizeof(int16_t) * length);
   index_ += length;
   return 0;
 }
 
-int StandaloneVad::GetActivity(double* p, int length_p) {
+int StandaloneVad::GetActivity(double* p, size_t length_p) {
   if (index_ == 0)
     return -1;
 
-  const int num_frames = index_ / kLength10Ms;
+  const size_t num_frames = index_ / kLength10Ms;
   if (num_frames > length_p)
     return -1;
   assert(WebRtcVad_ValidRateAndFrameLength(kSampleRateHz, index_) == 0);
 
   int activity = WebRtcVad_Process(vad_, kSampleRateHz, buffer_, index_);
   if (activity < 0)
     return -1;
   else if (activity == 0)
     p[0] = 0.01;  // Arbitrary but small and non-zero.
   else
     p[0] = 0.5;  // 0.5 is neutral values when combinned by other probabilities.
-  for (int n = 1; n < num_frames; n++)
+  for (size_t n = 1; n < num_frames; n++)
     p[n] = p[0];
   // Reset the buffer to start from the beginning.
   index_ = 0;
   return activity;
 }
 
 int StandaloneVad::set_mode(int mode) {
   if (mode < 0 || mode > 3)
     return -1;
   if (WebRtcVad_set_mode(vad_, mode) != 0)
     return -1;
 
   mode_ = mode;
   return 0;
 }
 
 }  // namespace webrtc