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/*
* Copyright (c) 2016 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 MODULES_VIDEO_CODING_HISTOGRAM_H_
#define MODULES_VIDEO_CODING_HISTOGRAM_H_
#include <cstddef>
#include <vector>
namespace webrtc {
namespace video_coding {
class Histogram {
public:
// A discrete histogram where every bucket with range [0, num_buckets).
// Values greater or equal to num_buckets will be placed in the last bucket.
Histogram(size_t num_buckets, size_t max_num_values);
// Add a value to the histogram. If there already is max_num_values in the
// histogram then the oldest value will be replaced with the new value.
void Add(size_t value);
// Calculates how many buckets have to be summed in order to accumulate at
// least the given probability.
size_t InverseCdf(float probability) const;
// How many values that make up this histogram.
size_t NumValues() const;
private:
// A circular buffer that holds the values that make up the histogram.
std::vector<size_t> values_;
std::vector<size_t> buckets_;
size_t index_;
};
} // namespace video_coding
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_HISTOGRAM_H_
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