Make the nonlinear beamformer steerable

webrtc/modules/audio_processing/include/audio_processing.h

 /*
  *  Copyright (c) 2012 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_INCLUDE_AUDIO_PROCESSING_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_PROCESSING_H_
 
+// MSVC++ requires this to be set before any other includes to get M_PI.
+#define _USE_MATH_DEFINES
+
+#include <math.h>
 #include <stddef.h>  // size_t
 #include <stdio.h>  // FILE
 #include <vector>
 
 #include "webrtc/base/arraysize.h"
 #include "webrtc/base/platform_file.h"
 #include "webrtc/common.h"
 #include "webrtc/modules/audio_processing/beamformer/array_util.h"
 #include "webrtc/typedefs.h"
 
@@ skipping 78 matching lines @@
   ExperimentalNs() : enabled(false) {}
   explicit ExperimentalNs(bool enabled) : enabled(enabled) {}
   bool enabled;
 };
 
 // Use to enable beamforming. Must be provided through the constructor. It will
 // have no impact if used with AudioProcessing::SetExtraOptions().
 struct Beamforming {
   Beamforming()
       : enabled(false),
-        array_geometry() {}
+        array_geometry(),
+        target_direction(
+            SphericalPointf(static_cast<float>(M_PI) / 2.f, 0.f, 1.f)) {}
   Beamforming(bool enabled, const std::vector<Point>& array_geometry)
+      : Beamforming(enabled,
+                    array_geometry,
+                    SphericalPointf(static_cast<float>(M_PI) / 2.f, 0.f, 1.f)) {
+  }
+  Beamforming(bool enabled,
+              const std::vector<Point>& array_geometry,
+              SphericalPointf target_direction)
       : enabled(enabled),
-        array_geometry(array_geometry) {}
+        array_geometry(array_geometry),
+        target_direction(target_direction) {}
   const bool enabled;
   const std::vector<Point> array_geometry;
+  const SphericalPointf target_direction;
 };
 
 // Use to enable intelligibility enhancer in audio processing. Must be provided
 // though the constructor. It will have no impact if used with
 // AudioProcessing::SetExtraOptions().
 //
 // Note: If enabled and the reverse stream has more than one output channel,
 // the reverse stream will become an upmixed mono signal.
 struct Intelligibility {
   Intelligibility() : enabled(false) {}
@@ skipping 801 matching lines @@
   // This does not impact the size of frames passed to |ProcessStream()|.
   virtual int set_frame_size_ms(int size) = 0;
   virtual int frame_size_ms() const = 0;
 
  protected:
   virtual ~VoiceDetection() {}
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_INCLUDE_AUDIO_PROCESSING_H_