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

#include <array>
#include <vector>

#include "modules/audio_processing/aec3/aec3_common.h"
#include "rtc_base/checks.h"

namespace webrtc {
namespace {

// signal.butter(2, 3400/8000.0, 'lowpass', analog=False)
const std::vector<CascadedBiQuadFilter::BiQuadParam> GetLowPassFilterDS2() { … }

// signal.ellip(6, 1, 40, 1800/8000, btype='lowpass', analog=False)
const std::vector<CascadedBiQuadFilter::BiQuadParam> GetLowPassFilterDS4() { … }

// signal.cheby1(1, 6, [1000/8000, 2000/8000], btype='bandpass', analog=False)
const std::vector<CascadedBiQuadFilter::BiQuadParam> GetBandPassFilterDS8() { … }

// signal.butter(2, 1000/8000.0, 'highpass', analog=False)
const std::vector<CascadedBiQuadFilter::BiQuadParam> GetHighPassFilter() { … }

const std::vector<CascadedBiQuadFilter::BiQuadParam> GetPassThroughFilter() { … }
}  // namespace

Decimator::Decimator(size_t down_sampling_factor)
    : … { … }

void Decimator::Decimate(rtc::ArrayView<const float> in,
                         rtc::ArrayView<float> out) { … }

}  // namespace webrtc