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_HISTOGRAMS_H_ 12 #define MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_ 13 14 #include <array> 15 16 #include "api/array_view.h" 17 #include "modules/audio_processing/ns/ns_common.h" 18 #include "modules/audio_processing/ns/signal_model.h" 19 20 namespace webrtc { 21 22 constexpr int kHistogramSize = 1000; 23 24 // Class for handling the updating of histograms. 25 class Histograms { 26 public: 27 Histograms(); 28 Histograms(const Histograms&) = delete; 29 Histograms& operator=(const Histograms&) = delete; 30 31 // Clears the histograms. 32 void Clear(); 33 34 // Extracts thresholds for feature parameters and updates the corresponding 35 // histogram. 36 void Update(const SignalModel& features_); 37 38 // Methods for accessing the histograms. get_lrt()39 rtc::ArrayView<const int, kHistogramSize> get_lrt() const { return lrt_; } get_spectral_flatness()40 rtc::ArrayView<const int, kHistogramSize> get_spectral_flatness() const { 41 return spectral_flatness_; 42 } get_spectral_diff()43 rtc::ArrayView<const int, kHistogramSize> get_spectral_diff() const { 44 return spectral_diff_; 45 } 46 47 private: 48 std::array<int, kHistogramSize> lrt_; 49 std::array<int, kHistogramSize> spectral_flatness_; 50 std::array<int, kHistogramSize> spectral_diff_; 51 }; 52 53 } // namespace webrtc 54 55 #endif // MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_ 56