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

webrtc/common_audio/real_fourier_ooura.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
 #include "webrtc/common_audio/real_fourier_ooura.h"
 
 #include <cmath>
 #include <algorithm>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/common_audio/fft4g.h"
 
 namespace webrtc {
 
 using std::complex;
 
 namespace {
 
-void Conjugate(complex<float>* array, int complex_length) {
+void Conjugate(complex<float>* array, size_t complex_length) {
   std::for_each(array, array + complex_length,
                 [=](complex<float>& v) { v = std::conj(v); });
 }
 
-size_t ComputeWorkIpSize(int fft_length) {
+size_t ComputeWorkIpSize(size_t fft_length) {
   return static_cast<size_t>(2 + std::ceil(std::sqrt(
       static_cast<float>(fft_length))));
 }
 
 }  // namespace
 
 RealFourierOoura::RealFourierOoura(int fft_order)
     : order_(fft_order),
       length_(FftLength(order_)),
       complex_length_(ComplexLength(order_)),
       // Zero-initializing work_ip_ will cause rdft to initialize these work
       // arrays on the first call.
-      work_ip_(new int[ComputeWorkIpSize(length_)]()),
+      work_ip_(new size_t[ComputeWorkIpSize(length_)]()),
       work_w_(new float[complex_length_]()) {
   CHECK_GE(fft_order, 1);
 }
 
 void RealFourierOoura::Forward(const float* src, complex<float>* dest) const {
   {
     // This cast is well-defined since C++11. See "Non-static data members" at:
     // http://en.cppreference.com/w/cpp/numeric/complex
     auto dest_float = reinterpret_cast<float*>(dest);
     std::copy(src, src + length_, dest_float);
     WebRtc_rdft(length_, 1, dest_float, work_ip_.get(), work_w_.get());
   }
 
   // Ooura places real[n/2] in imag[0].
   dest[complex_length_ - 1] = complex<float>(dest[0].imag(), 0.0f);
   dest[0] = complex<float>(dest[0].real(), 0.0f);
   // Ooura returns the conjugate of the usual Fourier definition.
   Conjugate(dest, complex_length_);
 }
 
 void RealFourierOoura::Inverse(const complex<float>* src, float* dest) const {
   {
     auto dest_complex = reinterpret_cast<complex<float>*>(dest);
     // The real output array is shorter than the input complex array by one
     // complex element.
-    const int dest_complex_length = complex_length_ - 1;
+    const size_t dest_complex_length = complex_length_ - 1;
     std::copy(src, src + dest_complex_length, dest_complex);
     // Restore Ooura's conjugate definition.
     Conjugate(dest_complex, dest_complex_length);
     // Restore real[n/2] to imag[0].
     dest_complex[0] = complex<float>(dest_complex[0].real(),
                                      src[complex_length_ - 1].real());
   }
 
   WebRtc_rdft(length_, -1, dest, work_ip_.get(), work_w_.get());
 
   // Ooura returns a scaled version.
   const float scale = 2.0f / length_;
   std::for_each(dest, dest + length_, [scale](float& v) { v *= scale; });
 }
 
 }  // namespace webrtc