Miscellaneous changes split from https://codereview.webrtc.org/1230503003 .

webrtc/common_audio/resampler/sinc_resampler.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.
  */
 
@@ skipping 79 matching lines @@
 #include <assert.h>
 #include <math.h>
 #include <string.h>
 
 #include <limits>
 
 #include "webrtc/system_wrappers/interface/cpu_features_wrapper.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
+
 namespace {
 
 double SincScaleFactor(double io_ratio) {
   // |sinc_scale_factor| is basically the normalized cutoff frequency of the
   // low-pass filter.
   double sinc_scale_factor = io_ratio > 1.0 ? 1.0 / io_ratio : 1.0;
 
   // The sinc function is an idealized brick-wall filter, but since we're
   // windowing it the transition from pass to stop does not happen right away.
   // So we should adjust the low pass filter cutoff slightly downward to avoid
@@ skipping 257 matching lines @@
     sum1 += *input_ptr * *k1++;
     sum2 += *input_ptr++ * *k2++;
   }
 
   // Linearly interpolate the two "convolutions".
   return static_cast<float>((1.0 - kernel_interpolation_factor) * sum1 +
       kernel_interpolation_factor * sum2);
 }
 
 }  // namespace webrtc