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/*
* Copyright (c) 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/video_coding/utility/moving_average.h"
#include <algorithm>
namespace webrtc {
MovingAverage::MovingAverage(size_t s) : sum_history_(s + 1, 0) {}
void MovingAverage::AddSample(int sample) {
count_++;
sum_ += sample;
sum_history_[count_ % sum_history_.size()] = sum_;
}
rtc::Optional<int> MovingAverage::GetAverage() const {
return GetAverage(size());
}
rtc::Optional<int> MovingAverage::GetAverage(size_t num_samples) const {
if (num_samples > size() || num_samples == 0)
return rtc::nullopt;
int sum = sum_ - sum_history_[(count_ - num_samples) % sum_history_.size()];
return sum / static_cast<int>(num_samples);
}
void MovingAverage::Reset() {
count_ = 0;
sum_ = 0;
std::fill(sum_history_.begin(), sum_history_.end(), 0);
}
size_t MovingAverage::size() const {
return std::min(count_, sum_history_.size() - 1);
}
} // namespace webrtc
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