chromium/third_party/webrtc/modules/audio_processing/ns/prior_signal_model_estimator.cc

/*
 *  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.
 */

#include "modules/audio_processing/ns/prior_signal_model_estimator.h"

#include <math.h>

#include <algorithm>

#include "modules/audio_processing/ns/fast_math.h"
#include "rtc_base/checks.h"

namespace webrtc {

namespace {

// Identifies the first of the two largest peaks in the histogram.
void FindFirstOfTwoLargestPeaks(
    float bin_size,
    rtc::ArrayView<const int, kHistogramSize> spectral_flatness,
    float* peak_position,
    int* peak_weight) { … }

void UpdateLrt(rtc::ArrayView<const int, kHistogramSize> lrt_histogram,
               float* prior_model_lrt,
               bool* low_lrt_fluctuations) { … }

}  // namespace

PriorSignalModelEstimator::PriorSignalModelEstimator(float lrt_initial_value)
    : … { … }

// Extract thresholds for feature parameters and computes the threshold/weights.
void PriorSignalModelEstimator::Update(const Histograms& histograms) { … }

}  // namespace webrtc