42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
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#include <array>
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#include <vector>
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#include "api/array_view.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/utility/cascaded_biquad_filter.h"
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namespace webrtc {
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// Provides functionality for decimating a signal.
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class Decimator {
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public:
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explicit Decimator(size_t down_sampling_factor);
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Decimator(const Decimator&) = delete;
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Decimator& operator=(const Decimator&) = delete;
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// Downsamples the signal.
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void Decimate(rtc::ArrayView<const float> in, rtc::ArrayView<float> out);
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private:
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const size_t down_sampling_factor_;
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CascadedBiQuadFilter anti_aliasing_filter_;
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CascadedBiQuadFilter noise_reduction_filter_;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_
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