| /* |
| * Copyright (c) 2015 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. |
| */ |
| |
| #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_MOVING_AVERAGE_H_ |
| #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_MOVING_AVERAGE_H_ |
| |
| #include <stddef.h> |
| |
| #include <list> |
| |
| #include "webrtc/typedefs.h" |
| |
| namespace webrtc { |
| template <class T> |
| class MovingAverage { |
| public: |
| MovingAverage(); |
| void AddSample(T sample); |
| bool GetAverage(size_t num_samples, T* average); |
| void Reset(); |
| int size(); |
| |
| private: |
| T sum_; |
| std::list<T> samples_; |
| }; |
| |
| template <class T> |
| MovingAverage<T>::MovingAverage() |
| : sum_(static_cast<T>(0)) {} |
| |
| template <class T> |
| void MovingAverage<T>::AddSample(T sample) { |
| samples_.push_back(sample); |
| sum_ += sample; |
| } |
| |
| template <class T> |
| bool MovingAverage<T>::GetAverage(size_t num_samples, T* avg) { |
| if (num_samples > samples_.size()) |
| return false; |
| |
| // Remove old samples. |
| while (num_samples < samples_.size()) { |
| sum_ -= samples_.front(); |
| samples_.pop_front(); |
| } |
| |
| *avg = sum_ / static_cast<T>(num_samples); |
| return true; |
| } |
| |
| template <class T> |
| void MovingAverage<T>::Reset() { |
| sum_ = static_cast<T>(0); |
| samples_.clear(); |
| } |
| |
| template <class T> |
| int MovingAverage<T>::size() { |
| return samples_.size(); |
| } |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_MOVING_AVERAGE_H_ |