OLD | NEW |
(Empty) | |
| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_BASE_MOVING_AVERAGE_H_ |
| 6 #define MEDIA_BASE_MOVING_AVERAGE_H_ |
| 7 |
| 8 #include <vector> |
| 9 |
| 10 #include "base/time/time.h" |
| 11 #include "media/base/media_export.h" |
| 12 |
| 13 namespace media { |
| 14 |
| 15 // Simple class for calculating a moving average of fixed size. |
| 16 class MEDIA_EXPORT MovingAverage { |
| 17 public: |
| 18 // Creates a MovingAverage instance with space for |depth| samples. |
| 19 explicit MovingAverage(size_t depth); |
| 20 ~MovingAverage(); |
| 21 |
| 22 // Adds a new sample to the average; replaces the oldest sample if |depth_| |
| 23 // has been exceeded. Updates |total_| to the new sum of values. |
| 24 void AddSample(base::TimeDelta sample); |
| 25 |
| 26 // Returns the current average of all held samples. |
| 27 base::TimeDelta Average() const; |
| 28 |
| 29 // Resets the state of the class to its initial post-construction state. |
| 30 void Reset(); |
| 31 |
| 32 private: |
| 33 // Maximum number of elements allowed in the average. |
| 34 const size_t depth_; |
| 35 |
| 36 // Number of elements seen thus far. |
| 37 size_t count_; |
| 38 |
| 39 std::vector<base::TimeDelta> samples_; |
| 40 base::TimeDelta total_; |
| 41 |
| 42 DISALLOW_COPY_AND_ASSIGN(MovingAverage); |
| 43 }; |
| 44 |
| 45 } // namespace media |
| 46 |
| 47 #endif // MEDIA_BASE_MOVING_AVERAGE_H_ |
OLD | NEW |