Update audio code to use size_t more correctly, webrtc/common_audio/resampler/

webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.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.
  */
 
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 
 #include "webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.h"
 
 #include <math.h>
 
 namespace webrtc {
 
 SinusoidalLinearChirpSource::SinusoidalLinearChirpSource(int sample_rate,
-  int samples, double max_frequency, double delay_samples)
+                                                         size_t samples,
+                                                         double max_frequency,
+                                                         size_t delay_samples)
     : sample_rate_(sample_rate),
       total_samples_(samples),
       max_frequency_(max_frequency),
       current_index_(0),
       delay_samples_(delay_samples) {
   // Chirp rate.
   double duration = static_cast<double>(total_samples_) / sample_rate_;
   k_ = (max_frequency_ - kMinFrequency) / duration;
 }
 
-void SinusoidalLinearChirpSource::Run(int frames, float* destination) {
-  for (int i = 0; i < frames; ++i, ++current_index_) {
+void SinusoidalLinearChirpSource::Run(size_t frames, float* destination) {
+  for (size_t i = 0; i < frames; ++i, ++current_index_) {
     // Filter out frequencies higher than Nyquist.
     if (Frequency(current_index_) > 0.5 * sample_rate_) {
       destination[i] = 0;
     } else {
       // Calculate time in seconds.
       if (current_index_ < delay_samples_) {
         destination[i] = 0;
       } else {
         // Sinusoidal linear chirp.
-        double t = (current_index_ - delay_samples_) / sample_rate_;
+        double t =
+            static_cast<double>(current_index_ - delay_samples_) / sample_rate_;
         destination[i] =
             sin(2 * M_PI * (kMinFrequency * t + (k_ / 2) * t * t));
       }
     }
   }
 }
 
-double SinusoidalLinearChirpSource::Frequency(int position) {
-  return kMinFrequency + (position - delay_samples_) *
+double SinusoidalLinearChirpSource::Frequency(size_t position) {
+  return kMinFrequency + (static_cast<double>(position) - delay_samples_) *
       (max_frequency_ - kMinFrequency) / total_samples_;
 }
 
 }  // namespace webrtc