1 /* 2 * Copyright (c) 2012 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 WEBRTC_MODULES_AUDIO_PROCESSING_VAD_POLE_ZERO_FILTER_H_ 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_VAD_POLE_ZERO_FILTER_H_ 13 14 #include <cstddef> 15 16 #include "webrtc/typedefs.h" 17 18 namespace webrtc { 19 20 class PoleZeroFilter { 21 public: 22 ~PoleZeroFilter() {} 23 24 static PoleZeroFilter* Create(const float* numerator_coefficients, 25 size_t order_numerator, 26 const float* denominator_coefficients, 27 size_t order_denominator); 28 29 int Filter(const int16_t* in, size_t num_input_samples, float* output); 30 31 private: 32 PoleZeroFilter(const float* numerator_coefficients, 33 size_t order_numerator, 34 const float* denominator_coefficients, 35 size_t order_denominator); 36 37 static const int kMaxFilterOrder = 24; 38 39 int16_t past_input_[kMaxFilterOrder * 2]; 40 float past_output_[kMaxFilterOrder * 2]; 41 42 float numerator_coefficients_[kMaxFilterOrder + 1]; 43 float denominator_coefficients_[kMaxFilterOrder + 1]; 44 45 size_t order_numerator_; 46 size_t order_denominator_; 47 size_t highest_order_; 48 }; 49 50 } // namespace webrtc 51 52 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_VAD_POLE_ZERO_FILTER_H_ 53
