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Diffstat (limited to 'webrtc/modules/video_coding/utility/moving_average.h')
-rw-r--r-- | webrtc/modules/video_coding/utility/moving_average.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/webrtc/modules/video_coding/utility/moving_average.h b/webrtc/modules/video_coding/utility/moving_average.h new file mode 100644 index 0000000000..494bfd51fb --- /dev/null +++ b/webrtc/modules/video_coding/utility/moving_average.h @@ -0,0 +1,71 @@ +/* + * 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 <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_ |