| /* |
| * 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. |
| */ |
| |
| #ifndef RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_ |
| #define RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_ |
| |
| #include "absl/types/optional.h" |
| |
| namespace rtc { |
| |
| // Simple utility class for counting basic statistics (max./avg./variance) on |
| // stream of samples. |
| class SampleCounter { |
| public: |
| SampleCounter(); |
| ~SampleCounter(); |
| void Add(int sample); |
| absl::optional<int> Avg(int64_t min_required_samples) const; |
| absl::optional<int64_t> Variance(int64_t min_required_samples) const; |
| absl::optional<int> Max() const; |
| void Reset(); |
| // Adds all the samples from the |other| SampleCounter as if they were all |
| // individually added using |Add(int)| method. |
| void Add(const SampleCounter& other); |
| |
| private: |
| int64_t sum_ = 0; |
| int64_t sum_squared_ = 0; |
| int64_t num_samples_ = 0; |
| absl::optional<int> max_; |
| }; |
| |
| } // namespace rtc |
| #endif // RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_ |