61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
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/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/numerics/moving_average.h"
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#include <algorithm>
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#include "rtc_base/checks.h"
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namespace rtc {
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MovingAverage::MovingAverage(size_t window_size) : history_(window_size, 0) {
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// Limit window size to avoid overflow.
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RTC_DCHECK_LE(window_size, (int64_t{1} << 32) - 1);
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}
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MovingAverage::~MovingAverage() = default;
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void MovingAverage::AddSample(int sample) {
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count_++;
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size_t index = count_ % history_.size();
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if (count_ > history_.size())
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sum_ -= history_[index];
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sum_ += sample;
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history_[index] = sample;
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}
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absl::optional<int> MovingAverage::GetAverageRoundedDown() const {
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if (count_ == 0)
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return absl::nullopt;
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return sum_ / Size();
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}
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absl::optional<int> MovingAverage::GetAverageRoundedToClosest() const {
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if (count_ == 0)
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return absl::nullopt;
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return (sum_ + Size() / 2) / Size();
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}
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absl::optional<double> MovingAverage::GetUnroundedAverage() const {
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if (count_ == 0)
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return absl::nullopt;
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return sum_ / static_cast<double>(Size());
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}
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void MovingAverage::Reset() {
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count_ = 0;
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sum_ = 0;
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}
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size_t MovingAverage::Size() const {
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return std::min(count_, history_.size());
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}
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} // namespace rtc
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