iir_df1.h

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/* SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright(c) 2022 Intel Corporation. All rights reserved.
 *
 * Author: Andrula Song <andrula.song@intel.com>
 */
 
#ifndef __SOF_MATH_IIR_DF1_H__
#define __SOF_MATH_IIR_DF1_H__
 
#include <stddef.h>
#include <stdint.h>
#include <sof/common.h>
 
#define IIR_DF1_NUM_STATE 4
#define SOF_IIR_DF1_4TH_NUM_BIQUADS 2
 
struct iir_state_df1 {
    unsigned int biquads; /* Number of IIR 2nd order sections total */
    unsigned int biquads_in_series; /* Number of IIR 2nd order sections
                     * in series.
                     */
    int32_t *coef; /* Pointer to IIR coefficients */
    int32_t *delay; /* Pointer to IIR delay line */
};
 
struct sof_eq_iir_header;
 
int iir_init_coef_df1(struct iir_state_df1 *iir,
              struct sof_eq_iir_header *config);
 
int iir_delay_size_df1(struct sof_eq_iir_header *config);
 
void iir_init_delay_df1(struct iir_state_df1 *iir, int32_t **state);
 
void iir_reset_df1(struct iir_state_df1 *iir);

int32_t iir_df1(struct iir_state_df1 *iir, int32_t x);

int32_t iir_df1_4th(struct iir_state_df1 *iir, int32_t x);
 
/* Inline functions */
#if SOF_USE_MIN_HIFI(3, FILTER)
#include "iir_df1_hifi3.h"
#else
#include "iir_df1_generic.h"
#endif
 
#endif