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/*
* Copyright (c) 2012 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_VAD_POLE_ZERO_FILTER_H_
#define MODULES_AUDIO_PROCESSING_VAD_POLE_ZERO_FILTER_H_
#include <stddef.h>
#include <stdint.h>
namespace webrtc {
class PoleZeroFilter {
public:
~PoleZeroFilter() {}
static PoleZeroFilter* Create(const float* numerator_coefficients,
size_t order_numerator,
const float* denominator_coefficients,
size_t order_denominator);
int Filter(const int16_t* in, size_t num_input_samples, float* output);
private:
PoleZeroFilter(const float* numerator_coefficients,
size_t order_numerator,
const float* denominator_coefficients,
size_t order_denominator);
static const int kMaxFilterOrder = 24;
int16_t past_input_[kMaxFilterOrder * 2];
float past_output_[kMaxFilterOrder * 2];
float numerator_coefficients_[kMaxFilterOrder + 1];
float denominator_coefficients_[kMaxFilterOrder + 1];
size_t order_numerator_;
size_t order_denominator_;
size_t highest_order_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_VAD_POLE_ZERO_FILTER_H_
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