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+/*
+ * Copyright (c) 2019 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_AUDIO_PROCESSING_NS_HISTOGRAMS_H_
+#define MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_
+
+#include <array>
+
+#include "api/array_view.h"
+#include "modules/audio_processing/ns/ns_common.h"
+#include "modules/audio_processing/ns/signal_model.h"
+
+namespace webrtc {
+
+constexpr int kHistogramSize = 1000;
+
+// Class for handling the updating of histograms.
+class Histograms {
+ public:
+ Histograms();
+ Histograms(const Histograms&) = delete;
+ Histograms& operator=(const Histograms&) = delete;
+
+ // Clears the histograms.
+ void Clear();
+
+ // Extracts thresholds for feature parameters and updates the corresponding
+ // histogram.
+ void Update(const SignalModel& features_);
+
+ // Methods for accessing the histograms.
+ rtc::ArrayView<const int, kHistogramSize> get_lrt() const { return lrt_; }
+ rtc::ArrayView<const int, kHistogramSize> get_spectral_flatness() const {
+ return spectral_flatness_;
+ }
+ rtc::ArrayView<const int, kHistogramSize> get_spectral_diff() const {
+ return spectral_diff_;
+ }
+
+ private:
+ std::array<int, kHistogramSize> lrt_;
+ std::array<int, kHistogramSize> spectral_flatness_;
+ std::array<int, kHistogramSize> spectral_diff_;
+};
+
+} // namespace webrtc
+
+#endif // MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_