diff options
Diffstat (limited to 'third_party/libwebrtc/rtc_base/numerics/moving_average.cc')
-rw-r--r-- | third_party/libwebrtc/rtc_base/numerics/moving_average.cc | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/numerics/moving_average.cc b/third_party/libwebrtc/rtc_base/numerics/moving_average.cc new file mode 100644 index 0000000000..c825839227 --- /dev/null +++ b/third_party/libwebrtc/rtc_base/numerics/moving_average.cc @@ -0,0 +1,60 @@ +/* + * Copyright (c) 2018 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 "rtc_base/numerics/moving_average.h" + +#include <algorithm> + +#include "rtc_base/checks.h" + +namespace rtc { + +MovingAverage::MovingAverage(size_t window_size) : history_(window_size, 0) { + // Limit window size to avoid overflow. + RTC_DCHECK_LE(window_size, (int64_t{1} << 32) - 1); +} +MovingAverage::~MovingAverage() = default; + +void MovingAverage::AddSample(int sample) { + count_++; + size_t index = count_ % history_.size(); + if (count_ > history_.size()) + sum_ -= history_[index]; + sum_ += sample; + history_[index] = sample; +} + +absl::optional<int> MovingAverage::GetAverageRoundedDown() const { + if (count_ == 0) + return absl::nullopt; + return sum_ / Size(); +} + +absl::optional<int> MovingAverage::GetAverageRoundedToClosest() const { + if (count_ == 0) + return absl::nullopt; + return (sum_ + Size() / 2) / Size(); +} + +absl::optional<double> MovingAverage::GetUnroundedAverage() const { + if (count_ == 0) + return absl::nullopt; + return sum_ / static_cast<double>(Size()); +} + +void MovingAverage::Reset() { + count_ = 0; + sum_ = 0; +} + +size_t MovingAverage::Size() const { + return std::min(count_, history_.size()); +} +} // namespace rtc |