Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/numerics/sample_counter.h

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+/*
+ *  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 <stdint.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<int> Max() const;
+  absl::optional<int> Min() const;
+  absl::optional<int64_t> Sum(int64_t min_required_samples) const;
+  int64_t NumSamples() 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);
+
+ protected:
+  int64_t sum_ = 0;
+  int64_t num_samples_ = 0;
+  absl::optional<int> max_;
+  absl::optional<int> min_;
+};
+
+class SampleCounterWithVariance : public SampleCounter {
+ public:
+  SampleCounterWithVariance();
+  ~SampleCounterWithVariance();
+  void Add(int sample);
+  absl::optional<int64_t> Variance(int64_t min_required_samples) 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 SampleCounterWithVariance& other);
+
+ private:
+  int64_t sum_squared_ = 0;
+};
+
+}  // namespace rtc
+#endif  // RTC_BASE_NUMERICS_SAMPLE_COUNTER_H_