fir_hifi2ep.h

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/* SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright(c) 2017 Intel Corporation. All rights reserved.
 *
 * Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
 */
 
#ifndef __SOF_MATH_FIR_HIFI2EP_H__
#define __SOF_MATH_FIR_HIFI2EP_H__
 
#include <sof/math/fir_config.h>
#include <sof/common.h>
 
#if SOF_USE_HIFI(2, FILTER)
 
#include <sof/audio/audio_stream.h>
#include <sof/audio/buffer.h>
#include <user/fir.h>
#include <xtensa/config/defs.h>
#include <xtensa/tie/xt_hifi2.h>
#include <stdint.h>
 
struct comp_buffer;
struct sof_eq_fir_coef_data;
 
struct fir_state_32x16 {
    ae_p24x2f *rwp; /* Circular read and write pointer */
    ae_p24f *delay; /* Pointer to FIR delay line */
    ae_p24f *delay_end; /* Pointer to FIR delay line end */
    ae_p16x2s *coef; /* Pointer to FIR coefficients */
    int taps; /* Number of FIR taps */
    int length; /* Number of FIR taps plus input length (even) */
    int out_shift; /* Amount of right shifts at output */
};
 
void fir_reset(struct fir_state_32x16 *fir);
 
int fir_delay_size(struct sof_fir_coef_data *config);
 
int fir_init_coef(struct fir_state_32x16 *fir,
          struct sof_fir_coef_data *config);
 
void fir_init_delay(struct fir_state_32x16 *fir, int32_t **data);
 
/* Setup circular buffer for FIR input data delay */
static inline void fir_hifiep_setup_circular(struct fir_state_32x16 *fir)
{
    AE_SETCBEGIN0(fir->delay);
    AE_SETCEND0(fir->delay_end);
}
 
void fir_get_lrshifts(struct fir_state_32x16 *fir, int *lshift,
              int *rshift);
 
void fir_32x16(struct fir_state_32x16 *fir, int32_t x, int32_t *y, int lshift, int rshift);
 
void fir_32x16_2x(struct fir_state_32x16 *fir, int32_t x0, int32_t x1,
          int32_t *y0, int32_t *y1, int lshift, int rshift);
 
#endif
#endif /* __SOF_MATH_FIR_HIFI2EP_H__ */