histogram.h (1498B)
1 /* 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_VIDEO_CODING_HISTOGRAM_H_ 12 #define MODULES_VIDEO_CODING_HISTOGRAM_H_ 13 14 #include <cstddef> 15 #include <vector> 16 17 namespace webrtc { 18 namespace video_coding { 19 class Histogram { 20 public: 21 // A discrete histogram where every bucket with range [0, num_buckets). 22 // Values greater or equal to num_buckets will be placed in the last bucket. 23 Histogram(size_t num_buckets, size_t max_num_values); 24 25 // Add a value to the histogram. If there already is max_num_values in the 26 // histogram then the oldest value will be replaced with the new value. 27 void Add(size_t value); 28 29 // Calculates how many buckets have to be summed in order to accumulate at 30 // least the given probability. 31 size_t InverseCdf(float probability) const; 32 33 // How many values that make up this histogram. 34 size_t NumValues() const; 35 36 private: 37 // A circular buffer that holds the values that make up the histogram. 38 std::vector<size_t> values_; 39 std::vector<size_t> buckets_; 40 size_t index_; 41 }; 42 43 } // namespace video_coding 44 } // namespace webrtc 45 46 #endif // MODULES_VIDEO_CODING_HISTOGRAM_H_