Some minor (bitexact) AEC echo suppressor refactoring (#2)

webrtc/modules/audio_processing/aec/aec_core_internal.h

 /*
  *  Copyright (c) 2013 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 134 matching lines @@
   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;
   // 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;
+
 #ifdef WEBRTC_AEC_DEBUG_DUMP
   // Sequence number of this AEC instance, so that different instances can
   // choose different dump file names.
   int instance_index;
 
   // Number of times we've restarted dumping; used to pick new dump file names
   // each time.
   int debug_dump_count;
 
   RingBuffer* far_time_buf;
@@ skipping 37 matching lines @@
                                       const float* noisePow,
                                       const float* lambda);
 extern WebRtcAecComfortNoise WebRtcAec_ComfortNoise;
 
 typedef void (*WebRtcAecSubBandCoherence)(AecCore* aec,
                                           float efw[2][PART_LEN1],
                                           float dfw[2][PART_LEN1],
                                           float xfw[2][PART_LEN1],
                                           float* fft,
                                           float* cohde,
-                                          float* cohxd);
+                                          float* cohxd,
+                                          int* extreme_filter_divergence);
 extern WebRtcAecSubBandCoherence WebRtcAec_SubbandCoherence;
 
 typedef int (*WebRtcAecPartitionDelay)(const AecCore* aec);
 extern WebRtcAecPartitionDelay WebRtcAec_PartitionDelay;
 
 typedef void (*WebRtcAecStoreAsComplex)(const float* data,
                                         float data_complex[2][PART_LEN1]);
 extern WebRtcAecStoreAsComplex WebRtcAec_StoreAsComplex;
 
 typedef void (*WebRtcAecWindowData)(float* x_windowed, const float* x);
 extern WebRtcAecWindowData WebRtcAec_WindowData;
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC_AEC_CORE_INTERNAL_H_