Added support in the AEC for refined filter adaptation.

webrtc/modules/audio_processing/aec/aec_core_internal.h

Index: webrtc/modules/audio_processing/aec/aec_core_internal.h
diff --git a/webrtc/modules/audio_processing/aec/aec_core_internal.h b/webrtc/modules/audio_processing/aec/aec_core_internal.h
index 05f5083c4ad919065048ec157456bfc6936c473a..1f7b6b541fa9a27a07ac67d2c4e77e3a769dc695 100644
--- a/webrtc/modules/audio_processing/aec/aec_core_internal.h
+++ b/webrtc/modules/audio_processing/aec/aec_core_internal.h
@@ -35,11 +35,6 @@ enum {
   kHistorySizeBlocks = 125
 };
 
-// Extended filter adaptation parameters.
-// TODO(ajm): No narrowband tuning yet.
-static const float kExtendedMu = 0.4f;
-static const float kExtendedErrorThreshold = 1.0e-6f;
-
 typedef struct PowerLevel {
   PowerLevel();
 
@@ -126,12 +121,12 @@ struct AecCore {
   int system_delay;  // Current system delay buffered in AEC.
 
   int mult;  // sampling frequency multiple
-  int sampFreq;
+  int sampFreq = 16000;
   size_t num_bands;
   uint32_t seed;
 
-  float normal_mu;               // stepsize
-  float normal_error_threshold;  // error threshold
+  float filter_step_size;  // stepsize
+  float error_threshold;   // error threshold
 
   int noiseEstCtr;
 
@@ -178,6 +173,7 @@ struct AecCore {
   int extended_filter_enabled;
   // 1 = next generation aec mode enabled, 0 = disabled.
   int aec3_enabled;
+  bool refined_adaptive_filter_enabled;
 
   // Runtime selection of number of filter partitions.
   int num_partitions;
@@ -210,9 +206,8 @@ typedef void (*WebRtcAecFilterFar)(
     float h_fft_buf[2][kExtendedNumPartitions * PART_LEN1],
     float y_fft[2][PART_LEN1]);
 extern WebRtcAecFilterFar WebRtcAec_FilterFar;
-typedef void (*WebRtcAecScaleErrorSignal)(int extended_filter_enabled,
-                                          float normal_mu,
-                                          float normal_error_threshold,
+typedef void (*WebRtcAecScaleErrorSignal)(float mu,
+                                          float error_threshold,
                                           float x_pow[PART_LEN1],
                                           float ef[2][PART_LEN1]);
 extern WebRtcAecScaleErrorSignal WebRtcAec_ScaleErrorSignal;