decimator.h (1196B)
1 /* 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_ 13 14 #include <cstddef> 15 16 #include "api/array_view.h" 17 #include "modules/audio_processing/utility/cascaded_biquad_filter.h" 18 19 namespace webrtc { 20 21 // Provides functionality for decimating a signal. 22 class Decimator { 23 public: 24 explicit Decimator(size_t down_sampling_factor); 25 26 Decimator(const Decimator&) = delete; 27 Decimator& operator=(const Decimator&) = delete; 28 29 // Downsamples the signal. 30 void Decimate(ArrayView<const float> in, ArrayView<float> out); 31 32 private: 33 const size_t down_sampling_factor_; 34 CascadedBiQuadFilter anti_aliasing_filter_; 35 CascadedBiQuadFilter noise_reduction_filter_; 36 }; 37 } // namespace webrtc 38 39 #endif // MODULES_AUDIO_PROCESSING_AEC3_DECIMATOR_H_