Added basic framework for AEC3 in the audio processing module

webrtc/modules/audio_processing/aec/aec_core.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.
  */
 
@@ skipping 221 matching lines @@
   int delay_correction_count;
   int shift_offset;
   float delay_quality_threshold;
   int frame_count;
 
   // 0 = delay agnostic mode (signal based delay correction) disabled.
   // Otherwise enabled.
   int delay_agnostic_enabled;
   // 1 = extended filter mode enabled, 0 = disabled.
   int extended_filter_enabled;
-  // 1 = next generation aec mode enabled, 0 = disabled.
-  int aec3_enabled;
+  // 1 = refined filter adaptation aec mode enabled, 0 = disabled.
   bool refined_adaptive_filter_enabled;
 
   // Runtime selection of number of filter partitions.
   int num_partitions;
 
   // Flag that extreme filter divergence has been detected by the Echo
   // Suppressor.
   int extreme_filter_divergence;
 };
 
@@ skipping 49 matching lines @@
                              int metrics_mode,
                              int delay_logging);
 
 // Non-zero enables, zero disables.
 void WebRtcAec_enable_delay_agnostic(AecCore* self, int enable);
 
 // Returns non-zero if delay agnostic (i.e., signal based delay estimation) is
 // enabled and zero if disabled.
 int WebRtcAec_delay_agnostic_enabled(AecCore* self);
 
-// Non-zero enables, zero disables.
-void WebRtcAec_enable_aec3(AecCore* self, int enable);
-
-// Returns 1 if the next generation aec is enabled and zero if disabled.
-int WebRtcAec_aec3_enabled(AecCore* self);
-
 // Turns on/off the refined adaptive filter feature.
 void WebRtcAec_enable_refined_adaptive_filter(AecCore* self, bool enable);
 
 // Returns whether the refined adaptive filter is enabled.
 bool WebRtcAec_refined_adaptive_filter(const AecCore* self);
 
 // Enables or disables extended filter mode. Non-zero enables, zero disables.
 void WebRtcAec_enable_extended_filter(AecCore* self, int enable);
 
 // Returns non-zero if extended filter mode is enabled and zero if disabled.
 int WebRtcAec_extended_filter_enabled(AecCore* self);
 
 // Returns the current |system_delay|, i.e., the buffered difference between
 // far-end and near-end.
 int WebRtcAec_system_delay(AecCore* self);
 
 // Sets the |system_delay| to |value|.  Note that if the value is changed
 // improperly, there can be a performance regression.  So it should be used with
 // care.
 void WebRtcAec_SetSystemDelay(AecCore* self, int delay);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_H_