Make the separation between target and interferer scenario depend on microphone spacing in Nonlinea…

webrtc/modules/audio_processing/beamformer/array_util.h

 /*
  *  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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_
 
 #include <cmath>
+#include <vector>
 
 namespace webrtc {
 
 // Coordinates in meters.
 template<typename T>
 struct CartesianPoint {
   CartesianPoint(T x, T y, T z) {
     c[0] = x;
     c[1] = y;
     c[2] = z;
   }
   T x() const { return c[0]; }
   T y() const { return c[1]; }
   T z() const { return c[2]; }
   T c[3];
 };
 
 using Point = CartesianPoint<float>;
 
+// Returns the minimum distance between any two Points in the given
+// |array_geometry|.
+float GetMinimumSpacing(const std::vector<Point>& array_geometry);
+
 template<typename T>
 float Distance(CartesianPoint<T> a, CartesianPoint<T> b) {
   return std::sqrt((a.x() - b.x()) * (a.x() - b.x()) +
                    (a.y() - b.y()) * (a.y() - b.y()) +
                    (a.z() - b.z()) * (a.z() - b.z()));
 }
 
 template <typename T>
 struct SphericalPoint {
   SphericalPoint(T azimuth, T elevation, T radius) {
     s[0] = azimuth;
     s[1] = elevation;
     s[2] = radius;
   }
   T azimuth() const { return s[0]; }
   T elevation() const { return s[1]; }
   T distance() const { return s[2]; }
   T s[3];
 };
 
 using SphericalPointf = SphericalPoint<float>;
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_