42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|
||
|
|
#define MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|
||
|
|
|
||
|
|
#include <array>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "api/array_view.h"
|
||
|
|
#include "modules/audio_processing/aec3/aec3_common.h"
|
||
|
|
#include "modules/audio_processing/utility/cascaded_biquad_filter.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Provides functionality for decimating a signal.
|
||
|
|
class Decimator {
|
||
|
|
public:
|
||
|
|
explicit Decimator(size_t down_sampling_factor);
|
||
|
|
|
||
|
|
Decimator(const Decimator&) = delete;
|
||
|
|
Decimator& operator=(const Decimator&) = delete;
|
||
|
|
|
||
|
|
// Downsamples the signal.
|
||
|
|
void Decimate(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);
|
||
|
|
|
||
|
|
private:
|
||
|
|
const size_t down_sampling_factor_;
|
||
|
|
CascadedBiQuadFilter anti_aliasing_filter_;
|
||
|
|
CascadedBiQuadFilter noise_reduction_filter_;
|
||
|
|
};
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
|