fir.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 __USER_FIR_H__
#define __USER_FIR_H__
 
#include <stdint.h>
 
#define SOF_FIR_MAX_LENGTH 256 /* Max length for individual filter */
 
struct sof_fir_coef_data {
    int16_t length; /* Number of FIR taps */
    int16_t out_shift; /* Amount of right shifts at output */
 
    /* reserved */
    uint32_t reserved[4];
 
    int16_t coef[]; /* FIR coefficients */
} __attribute__((packed));
 
/* In the struct above there's two 16 bit words (length, shift) and four
 * reserved 32 bit words before the actual FIR coefficients. This information
 * is used in parsing of the configuration blob.
 */
#define SOF_FIR_COEF_NHEADER \
    (sizeof(struct sof_fir_coef_data) / sizeof(int16_t))
 
#endif /* __USER_FIR_H__ */