Adding fraction of filter divergence in AEC metrics.

webrtc/modules/audio_processing/utility/block_fraction_calculator.cc

 /*
  *  Copyright 2016 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.
  */
 
-#include "webrtc/modules/audio_processing/utility/block_mean_calculator.h"
+#include "webrtc/modules/audio_processing/utility/block_fraction_calculator.h"
 
 #include "webrtc/base/checks.h"
 
 namespace webrtc {
 
-BlockMeanCalculator::BlockMeanCalculator(size_t block_length)
+BlockFractionCalculator::BlockFractionCalculator(size_t block_length)
     : block_length_(block_length),
       count_(0),
-      sum_(0.0),
-      mean_(0.0) {
+      occurrence_(0),
+      fraction_(-1.0) {
   RTC_DCHECK(block_length_ != 0);
 }
 
-void BlockMeanCalculator::Reset() {
+void BlockFractionCalculator::Reset() {
   Clear();
-  mean_ = 0.0;
+  fraction_ = -1.0;
 }
 
-void BlockMeanCalculator::AddValue(float value) {
-  sum_ += value;
+void BlockFractionCalculator::AddObservation(bool occurred) {
+  if (occurred)
+    occurrence_++;
   ++count_;
   if (count_ == block_length_) {
-    mean_ = sum_ / block_length_;
+    fraction_ = static_cast<float>(occurrence_) / block_length_;
     Clear();
   }
 }
 
-bool BlockMeanCalculator::EndOfBlock() const {
-  return count_ == 0;
-}
-
-float BlockMeanCalculator::GetLatestMean() const {
-  return mean_;
+float BlockFractionCalculator::GetLatestFraction() const {
+  return fraction_;
 }
 
 // Flush all samples added.
-void BlockMeanCalculator::Clear() {
+void BlockFractionCalculator::Clear() {
   count_ = 0;
-  sum_ = 0.0;
+  occurrence_ = 0;
 }
 
 }  // namespace webrtc