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1 /*
2  *  Copyright (c) 2019 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_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_
12 #define MODULES_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_
13 
14 #include <math.h>
15 #include <array>
16 
17 #include "api/array_view.h"
18 #include "modules/audio_processing/ns/ns_common.h"
19 
20 namespace webrtc {
21 
22 constexpr int kSimult = 3;
23 
24 // For quantile noise estimation.
25 class QuantileNoiseEstimator {
26  public:
27   QuantileNoiseEstimator();
28   QuantileNoiseEstimator(const QuantileNoiseEstimator&) = delete;
29   QuantileNoiseEstimator& operator=(const QuantileNoiseEstimator&) = delete;
30 
31   // Estimate noise.
32   void Estimate(rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum,
33                 rtc::ArrayView<float, kFftSizeBy2Plus1> noise_spectrum);
34 
35  private:
36   std::array<float, kSimult * kFftSizeBy2Plus1> density_;
37   std::array<float, kSimult * kFftSizeBy2Plus1> log_quantile_;
38   std::array<float, kFftSizeBy2Plus1> quantile_;
39   std::array<int, kSimult> counter_;
40   int num_updates_ = 1;
41 };
42 
43 }  // namespace webrtc
44 
45 #endif  // MODULES_AUDIO_PROCESSING_NS_QUANTILE_NOISE_ESTIMATOR_H_
46