Update audio code to use size_t more correctly, webrtc/modules/audio_processing/

webrtc/modules/audio_processing/beamformer/covariance_matrix_generator.cc

 /*
  *  Copyright (c) 2014 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 33 matching lines @@
       } else {
         mat_els[i][j] = i == j ? 1.f : 0.f;
       }
     }
   }
 }
 
 void CovarianceMatrixGenerator::AngledCovarianceMatrix(
     float sound_speed,
     float angle,
-    int frequency_bin,
-    int fft_size,
-    int num_freq_bins,
+    size_t frequency_bin,
+    size_t fft_size,
+    size_t num_freq_bins,
     int sample_rate,
     const std::vector<Point>& geometry,
     ComplexMatrix<float>* mat) {
   CHECK_EQ(static_cast<int>(geometry.size()), mat->num_rows());
   CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
 
   ComplexMatrix<float> interf_cov_vector(1, geometry.size());
   ComplexMatrix<float> interf_cov_vector_transposed(geometry.size(), 1);
   PhaseAlignmentMasks(frequency_bin,
                       fft_size,
                       sample_rate,
                       sound_speed,
                       geometry,
                       angle,
                       &interf_cov_vector);
   interf_cov_vector_transposed.Transpose(interf_cov_vector);
   interf_cov_vector.PointwiseConjugate();
   mat->Multiply(interf_cov_vector_transposed, interf_cov_vector);
 }
 
 void CovarianceMatrixGenerator::PhaseAlignmentMasks(
-    int frequency_bin,
-    int fft_size,
+    size_t frequency_bin,
+    size_t fft_size,
     int sample_rate,
     float sound_speed,
     const std::vector<Point>& geometry,
     float angle,
     ComplexMatrix<float>* mat) {
   CHECK_EQ(1, mat->num_rows());
   CHECK_EQ(static_cast<int>(geometry.size()), mat->num_columns());
 
   float freq_in_hertz =
       (static_cast<float>(frequency_bin) / fft_size) * sample_rate;
 
   complex<float>* const* mat_els = mat->elements();
   for (size_t c_ix = 0; c_ix < geometry.size(); ++c_ix) {
     float distance = std::cos(angle) * geometry[c_ix].x() +
                      std::sin(angle) * geometry[c_ix].y();
     float phase_shift = -2.f * M_PI * distance * freq_in_hertz / sound_speed;
 
     // Euler's formula for mat[0][c_ix] = e^(j * phase_shift).
     mat_els[0][c_ix] = complex<float>(cos(phase_shift), sin(phase_shift));
   }
 }
 
 }  // namespace webrtc