chromium/third_party/webrtc/modules/audio_processing/aec3/suppression_filter.cc

/*
 *  Copyright (c) 2017 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/aec3/suppression_filter.h"

#include <algorithm>
#include <cmath>
#include <cstring>
#include <functional>
#include <iterator>

#include "modules/audio_processing/aec3/vector_math.h"
#include "rtc_base/checks.h"
#include "rtc_base/numerics/safe_minmax.h"

namespace webrtc {
namespace {

// Hanning window from Matlab command win = sqrt(hanning(128)).
const float kSqrtHanning[kFftLength] = …;

}  // namespace

SuppressionFilter::SuppressionFilter(Aec3Optimization optimization,
                                     int sample_rate_hz,
                                     size_t num_capture_channels)
    : … { … }

SuppressionFilter::~SuppressionFilter() = default;

void SuppressionFilter::ApplyGain(
    rtc::ArrayView<const FftData> comfort_noise,
    rtc::ArrayView<const FftData> comfort_noise_high_band,
    const std::array<float, kFftLengthBy2Plus1>& suppression_gain,
    float high_bands_gain,
    rtc::ArrayView<const FftData> E_lowest_band,
    Block* e) { … }

}  // namespace webrtc