98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*
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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 "api/numerics/samples_stats_counter.h"
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#include <algorithm>
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#include <cmath>
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#include "absl/algorithm/container.h"
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#include "rtc_base/time_utils.h"
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namespace webrtc {
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SamplesStatsCounter::SamplesStatsCounter() = default;
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SamplesStatsCounter::~SamplesStatsCounter() = default;
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SamplesStatsCounter::SamplesStatsCounter(const SamplesStatsCounter&) = default;
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SamplesStatsCounter& SamplesStatsCounter::operator=(
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const SamplesStatsCounter&) = default;
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SamplesStatsCounter::SamplesStatsCounter(SamplesStatsCounter&&) = default;
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SamplesStatsCounter& SamplesStatsCounter::operator=(SamplesStatsCounter&&) =
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default;
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void SamplesStatsCounter::AddSample(double value) {
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AddSample(StatsSample{value, Timestamp::Micros(rtc::TimeMicros())});
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}
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void SamplesStatsCounter::AddSample(StatsSample sample) {
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stats_.AddSample(sample.value);
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samples_.push_back(sample);
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sorted_ = false;
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}
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void SamplesStatsCounter::AddSamples(const SamplesStatsCounter& other) {
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stats_.MergeStatistics(other.stats_);
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samples_.insert(samples_.end(), other.samples_.begin(), other.samples_.end());
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sorted_ = false;
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}
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double SamplesStatsCounter::GetPercentile(double percentile) {
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RTC_DCHECK(!IsEmpty());
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RTC_CHECK_GE(percentile, 0);
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RTC_CHECK_LE(percentile, 1);
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if (!sorted_) {
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absl::c_sort(samples_, [](const StatsSample& a, const StatsSample& b) {
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return a.value < b.value;
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});
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sorted_ = true;
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}
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const double raw_rank = percentile * (samples_.size() - 1);
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double int_part;
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double fract_part = std::modf(raw_rank, &int_part);
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size_t rank = static_cast<size_t>(int_part);
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if (fract_part >= 1.0) {
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// It can happen due to floating point calculation error.
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rank++;
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fract_part -= 1.0;
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}
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RTC_DCHECK_GE(rank, 0);
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RTC_DCHECK_LT(rank, samples_.size());
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RTC_DCHECK_GE(fract_part, 0);
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RTC_DCHECK_LT(fract_part, 1);
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RTC_DCHECK(rank + fract_part == raw_rank);
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const double low = samples_[rank].value;
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const double high = samples_[std::min(rank + 1, samples_.size() - 1)].value;
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return low + fract_part * (high - low);
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}
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SamplesStatsCounter operator*(const SamplesStatsCounter& counter,
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double value) {
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SamplesStatsCounter out;
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for (const auto& sample : counter.GetTimedSamples()) {
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out.AddSample(
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SamplesStatsCounter::StatsSample{sample.value * value, sample.time});
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}
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return out;
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}
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SamplesStatsCounter operator/(const SamplesStatsCounter& counter,
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double value) {
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SamplesStatsCounter out;
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for (const auto& sample : counter.GetTimedSamples()) {
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out.AddSample(
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SamplesStatsCounter::StatsSample{sample.value / value, sample.time});
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}
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return out;
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}
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} // namespace webrtc
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