/* SPDX-License-Identifier: BSD-3-Clause

*

* Copyright(c) 2017 Intel Corporation. All rights reserved.

*

* Author: Amery Song <chao.song@intel.com>

* Keyon Jie <yang.jie@linux.intel.com>

*/

#ifndef __SOF_FFT_H__

#define __SOF_FFT_H__

#include <sof/audio/format.h>

#include <sof/common.h>

#include <stdbool.h>

#include <stdint.h>

#define FFT_GENERIC

#if defined(__XCC__)

#include <xtensa/config/core-isa.h>

#if XCHAL_HAVE_HIFI3 || XCHAL_HAVE_HIFI4

#undef FFT_GENERIC

#define FFT_HIFI3

#endif

#endif

#define FFT_SIZE_MAX 1024

struct icomplex32 {

int32_t real;

int32_t imag;

};

/* Note: the add of packed attribute to icmplex16 would significantly increase

* processing time of fft_execute_16() so it is not done. The optimized versions of

* FFT for HiFi will need a different packed data structure vs. generic C.

*/

struct icomplex16 {

int16_t real;

int16_t imag;

};

struct fft_plan {

uint32_t size; /* fft size */

uint32_t len; /* fft length in exponent of 2 */

uint16_t *bit_reverse_idx; /* pointer to bit reverse index array */

struct icomplex32 *inb32; /* pointer to input integer complex buffer */

struct icomplex32 *outb32; /* pointer to output integer complex buffer */

struct icomplex16 *inb16; /* pointer to input integer complex buffer */

struct icomplex16 *outb16; /* pointer to output integer complex buffer */

};

/* interfaces of the library */

struct fft_plan *fft_plan_new(void *inb, void *outb, uint32_t size, int bits);

void fft_execute_16(struct fft_plan *plan, bool ifft);

void fft_execute_32(struct fft_plan *plan, bool ifft);

void fft_plan_free(struct fft_plan *plan16);

#endif /* __SOF_FFT_H__ */