65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
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/*
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* Copyright (c) 2019 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_AUDIO_CODING_NETEQ_HISTOGRAM_H_
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#define MODULES_AUDIO_CODING_NETEQ_HISTOGRAM_H_
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#include <string.h> // Provide access to size_t.
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#include <vector>
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#include "absl/types/optional.h"
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namespace webrtc {
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class Histogram {
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public:
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// Creates histogram with capacity |num_buckets| and |forget_factor| in Q15.
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Histogram(size_t num_buckets,
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int forget_factor,
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absl::optional<double> start_forget_weight = absl::nullopt);
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virtual ~Histogram();
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// Resets the histogram to the default start distribution.
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virtual void Reset();
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// Add entry in bucket |index|.
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virtual void Add(int index);
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// Calculates the quantile at |probability| (in Q30) of the histogram
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// distribution.
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virtual int Quantile(int probability);
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// Returns the number of buckets in the histogram.
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virtual int NumBuckets() const;
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// Returns the probability for each bucket in Q30.
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std::vector<int> buckets() const { return buckets_; }
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// Accessors only intended for testing purposes.
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int base_forget_factor_for_testing() const { return base_forget_factor_; }
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int forget_factor_for_testing() const { return forget_factor_; }
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absl::optional<double> start_forget_weight_for_testing() const {
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return start_forget_weight_;
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}
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private:
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std::vector<int> buckets_;
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int forget_factor_; // Q15
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const int base_forget_factor_;
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int add_count_;
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const absl::optional<double> start_forget_weight_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_CODING_NETEQ_HISTOGRAM_H_
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