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

webrtc/modules/audio_processing/beamformer/array_util.cc

Index: webrtc/modules/audio_processing/beamformer/array_util.cc
diff --git a/webrtc/modules/audio_processing/beamformer/array_util.cc b/webrtc/modules/audio_processing/beamformer/array_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..201154bffce0ea8fa75272298df14e7278849629
--- /dev/null
+++ b/webrtc/modules/audio_processing/beamformer/array_util.cc
@@ -0,0 +1,30 @@
+/*
+ *  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/modules/audio_processing/beamformer/array_util.h"
+
+#include <limits>
+
+namespace webrtc {
+
+float GetMinimumSpacing(const std::vector<Point>& array_geometry) {

[Andrew MacDonald, 2015/10/19 22:35:07]

CHECK_GT(array_geometry.size(), 1);

[aluebs-webrtc, 2015/10/20 00:17:07]

Done.

+  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) {
+      float distance = Distance(array_geometry[i], array_geometry[j]);

[Andrew MacDonald, 2015/10/19 22:35:07]

A bit neater maybe:
mic_spacing = std::min(mic_spacing, Distance(...));

[aluebs-webrtc, 2015/10/20 00:17:07]

Done.

+      if (distance < mic_spacing) {
+        mic_spacing = distance;
+      }
+    }
+  }
+  return mic_spacing;
+}
+
+}  // namespace webrtc