chromium/third_party/webrtc/modules/audio_processing/aec3/render_signal_analyzer.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/render_signal_analyzer.h"

#include <math.h>

#include <algorithm>
#include <utility>
#include <vector>

#include "api/array_view.h"
#include "rtc_base/checks.h"

namespace webrtc {

namespace {
constexpr size_t kCounterThreshold = …;

// Identifies local bands with narrow characteristics.
void IdentifySmallNarrowBandRegions(
    const RenderBuffer& render_buffer,
    const absl::optional<size_t>& delay_partitions,
    std::array<size_t, kFftLengthBy2 - 1>* narrow_band_counters) { … }

// Identifies whether the signal has a single strong narrow-band component.
void IdentifyStrongNarrowBandComponent(const RenderBuffer& render_buffer,
                                       int strong_peak_freeze_duration,
                                       absl::optional<int>* narrow_peak_band,
                                       size_t* narrow_peak_counter) { … }

}  // namespace

RenderSignalAnalyzer::RenderSignalAnalyzer(const EchoCanceller3Config& config)
    : … { … }
RenderSignalAnalyzer::~RenderSignalAnalyzer() = default;

void RenderSignalAnalyzer::Update(
    const RenderBuffer& render_buffer,
    const absl::optional<size_t>& delay_partitions) { … }

void RenderSignalAnalyzer::MaskRegionsAroundNarrowBands(
    std::array<float, kFftLengthBy2Plus1>* v) const { … }

}  // namespace webrtc