nrf_dsp_var.h

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/*
 * Copyright (c) 2026 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
#ifndef _NRF_DSP_STAT_VAR_FUNCTIONS_H_
#define _NRF_DSP_STAT_VAR_FUNCTIONS_H_
 
#include <nrf_edgeai/dsp/nrf_dsp_types.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
flt32_t nrf_dsp_var_f32(const flt32_t* p_input, uint16_t num, nrf_dsp_stat_ctx_f32_t* p_ctx);
 
flt32_t nrf_dsp_var_f32_s(const flt32_t*          p_input,
                          uint16_t                num,
                          size32_t                stride,
                          nrf_dsp_stat_ctx_f32_t* p_ctx);
 
typedef struct nrf_dsp_derivative_var_f32_s
{
    flt32_t first;
 
    flt32_t second;
} nrf_dsp_derivative_var_f32_t;
 
void nrf_dsp_deriv_var_f32(const flt32_t*                p_input,
                           uint16_t                      num,
                           nrf_dsp_derivative_var_f32_t* p_deriv_variance);
 
uint16_t nrf_dsp_var_i8(const int8_t* p_input, uint16_t num, nrf_dsp_stat_ctx_i8_t* p_ctx);
 
uint16_t nrf_dsp_var_i8_s(const int8_t*          p_input,
                          uint16_t               num,
                          size32_t               stride,
                          nrf_dsp_stat_ctx_i8_t* p_ctx);
 
typedef struct nrf_dsp_derivative_var_i8_s
{
    uint16_t first;
 
    uint16_t second;
} nrf_dsp_derivative_var_i8_t;
 
void nrf_dsp_deriv_var_i8(const int8_t*                p_input,
                          uint16_t                     num,
                          nrf_dsp_derivative_var_i8_t* p_deriv_variance);
 
uint32_t nrf_dsp_var_i16(const int16_t* p_input, uint16_t num, nrf_dsp_stat_ctx_i16_t* p_ctx);
 
uint32_t nrf_dsp_var_i16_s(const int16_t*          p_input,
                           uint16_t                num,
                           size32_t                stride,
                           nrf_dsp_stat_ctx_i16_t* p_ctx);
 
typedef struct nrf_dsp_derivative_var_i16_s
{
    uint32_t first;
 
    uint32_t second;
} nrf_dsp_derivative_var_i16_t;
 
void nrf_dsp_deriv_var_i16(const int16_t*                p_input,
                           uint16_t                      num,
                           nrf_dsp_derivative_var_i16_t* p_deriv_variance);
 
#ifdef __cplusplus
}
#endif
 
#endif /* _NRF_DSP_STAT_VAR_FUNCTIONS_H_ */