Make the nonlinear beamformer steerable

webrtc/modules/audio_processing/beamformer/beamformer.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.
  */
 
@@ skipping 14 matching lines @@
   // into frequency bands inside the ChannelBuffer. The number of frames and
   // channels must correspond to the constructor parameters. The same
   // ChannelBuffer can be passed in as |input| and |output|.
   virtual void ProcessChunk(const ChannelBuffer<T>& input,
                             ChannelBuffer<T>* output) = 0;
 
   // Sample rate corresponds to the lower band.
   // Needs to be called before the the Beamformer can be used.
   virtual void Initialize(int chunk_size_ms, int sample_rate_hz) = 0;
 
+  // Aim the beamformer at a point in space.
+  virtual void AimAt(const SphericalPointf& spherical_point) = 0;
+
   // Indicates whether a given point is inside of the beam.
   virtual bool IsInBeam(const SphericalPointf& spherical_point) { return true; }
 
   // Returns true if the current data contains the target signal.
   // Which signals are considered "targets" is implementation dependent.
   virtual bool is_target_present() = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_BEAMFORMER_H_