text: /*
   *  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 "modules/audio_processing/utility/block_mean_calculator.h"
  
  #include "rtc_base/checks.h"
  
  namespace webrtc {
  
  BlockMeanCalculator::BlockMeanCalculator(size_t block_length)
      : block_length_(block_length), count_(0), sum_(0.0), mean_(0.0) {
    RTC_DCHECK(block_length_ != 0);
  }
  
  void BlockMeanCalculator::Reset() {
    Clear();
    mean_ = 0.0;
  }
  
  void BlockMeanCalculator::AddValue(float value) {
    sum_ += value;
    ++count_;
    if (count_ == block_length_) {
      mean_ = sum_ / block_length_;
      Clear();
    }
  }
  
  bool BlockMeanCalculator::EndOfBlock() const {
    return count_ == 0;
  }
  
  float BlockMeanCalculator::GetLatestMean() const {
    return mean_;
  }
  
  // Flush all samples added.
  void BlockMeanCalculator::Clear() {
    count_ = 0;
    sum_ = 0.0;
  }
  
  }  // namespace webrtc
  