47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_VIDEO_CODING_HISTOGRAM_H_
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#define MODULES_VIDEO_CODING_HISTOGRAM_H_
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#include <cstddef>
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#include <vector>
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namespace webrtc {
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namespace video_coding {
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class Histogram {
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public:
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// A discrete histogram where every bucket with range [0, num_buckets).
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// Values greater or equal to num_buckets will be placed in the last bucket.
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Histogram(size_t num_buckets, size_t max_num_values);
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// Add a value to the histogram. If there already is max_num_values in the
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// histogram then the oldest value will be replaced with the new value.
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void Add(size_t value);
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// Calculates how many buckets have to be summed in order to accumulate at
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// least the given probability.
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size_t InverseCdf(float probability) const;
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// How many values that make up this histogram.
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size_t NumValues() const;
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private:
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// A circular buffer that holds the values that make up the histogram.
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std::vector<size_t> values_;
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std::vector<size_t> buckets_;
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size_t index_;
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};
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} // namespace video_coding
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_HISTOGRAM_H_
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