Adding fraction of filter divergence in AEC metrics.

webrtc/modules/audio_processing/utility/block_fraction_calculator.cc

Index: webrtc/modules/audio_processing/utility/block_fraction_calculator.cc
diff --git a/webrtc/modules/audio_processing/utility/block_mean_calculator.cc b/webrtc/modules/audio_processing/utility/block_fraction_calculator.cc
similarity index 55%
copy from webrtc/modules/audio_processing/utility/block_mean_calculator.cc
copy to webrtc/modules/audio_processing/utility/block_fraction_calculator.cc
index 7f4508ecc7058f80a3c71e0ff390275b4bc6a0af..8dbfac7bdb02983ddb24674caa2c966f29da5687 100644
--- a/webrtc/modules/audio_processing/utility/block_mean_calculator.cc
+++ b/webrtc/modules/audio_processing/utility/block_fraction_calculator.cc
@@ -8,46 +8,43 @@
  *  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