Make the nonlinear beamformer steerable

webrtc/modules/audio_processing/beamformer/array_util.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.
  */
 
@@ skipping 11 matching lines @@
   float mic_spacing = std::numeric_limits<float>::max();
   for (size_t i = 0; i < (array_geometry.size() - 1); ++i) {
     for (size_t j = i + 1; j < array_geometry.size(); ++j) {
       mic_spacing =
           std::min(mic_spacing, Distance(array_geometry[i], array_geometry[j]));
     }
   }
   return mic_spacing;
 }
 
+float DegreesToRadians(float angle_degrees) {
+  return M_PI * angle_degrees / 180.f;
+}
+
+float RadiansToDegrees(float angle_radians) {
+  return 180.f * angle_radians / M_PI;
+}
+
 }  // namespace webrtc