edb9f00df7
This change is the complete Widevine metrics system. It will measure and record runtime information about what is happening in the CDM - such as errors and throughput. Bug: 33745339 Bug: 26027857 Change-Id: Ic9a82074f1e2b72c72d751b235f8ae361232787d
54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// This file contains the definition of a Distribution class which computes
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// the distribution values of a series of samples.
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#ifndef WVCDM_METRICS_DISTRIBUTION_H_
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#define WVCDM_METRICS_DISTRIBUTION_H_
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#include <stdint.h>
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namespace wvcdm {
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namespace metrics {
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// The Distribution class holds statistics about a series of values that the
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// client provides via the Record method. A caller will call Record once for
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// each of the values in a series. The Distribution instance will calculate the
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// mean, count, min, max and variance of the distribution.
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//
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// Example usage:
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// Distribution dist;
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// dist.Record(1);
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// dist.Record(2);
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// dist.Mean(); // Returns 1.5.
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// dist.Count(); // Returns 2.
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class Distribution {
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public:
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Distribution();
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// Uses the provided sample value to update the computed statistics.
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void Record(double value);
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// Return the value for each of the stats computed about the series of
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// values (min, max, count, etc.).
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const double Min() { return min_; }
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const double Max() { return max_; }
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const double Mean() { return mean_; }
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const int64_t Count() { return count_; }
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const double Variance() {
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return count_ == 0 ? 0.0 : sum_squared_deviation_ / count_;
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}
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private:
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int64_t count_;
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double min_;
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double max_;
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double mean_;
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double sum_squared_deviation_;
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};
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} // namespace metrics
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} // namespace wvcdm
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#endif // WVCDM_METRICS_DISTRIBUTION_H_
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