dsps_mulc.h File Reference

#include "dsp_err.h"
#include "dsps_mulc_platform.h"

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#define	dsps_mulc_f32   dsps_mulc_f32_ansi
#define	dsps_mulc_s16   dsps_mulc_s16_ansi
esp_err_t	dsps_mulc_f32_ansi (const float *input, float *output, int len, float C, int step_in, int step_out)
	multiply constant
esp_err_t	dsps_mulc_f32_ae32 (const float *input, float *output, int len, float C, int step_in, int step_out)
esp_err_t	dsps_mulc_s16_ae32 (const int16_t *input, int16_t *output, int len, int16_t C, int step_in, int step_out)
esp_err_t	dsps_mulc_s16_ansi (const int16_t *input, int16_t *output, int len, int16_t C, int step_in, int step_out)

Macro Definition Documentation

dsps_mulc_f32

#define dsps_mulc_f32   dsps_mulc_f32_ansi

Definition at line 69 of file dsps_mulc.h.

dsps_mulc_s16

#define dsps_mulc_s16   dsps_mulc_s16_ansi

Definition at line 70 of file dsps_mulc.h.

Function Documentation

dsps_mulc_f32_ae32()

esp_err_t dsps_mulc_f32_ae32	(	const float *	input,
		float *	output,
		int	len,
		float	C,
		int	step_in,
		int	step_out )

References C.

dsps_mulc_f32_ansi()

esp_err_t dsps_mulc_f32_ansi	(	const float *	input,
		float *	output,
		int	len,
		float	C,
		int	step_in,
		int	step_out )

multiply constant

The function multiplies input array to the constant value x[i*step_out] = y[i*step_in]*C; i=[0..len) The implementation use ANSI C and could be compiled and run on any platform

Parameters

[in]	input	input array
	output	output array
	len	amount of operations for arrays
	C	constant value
	step_in	step over input array (by default should be 1)
	step_out	step over output array (by default should be 1)

Returns

• ESP_OK on success
• One of the error codes from DSP library

Definition at line 17 of file dsps_mulc_f32_ansi.c.

{
    if (NULL == input) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == output) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
 
    for (int i = 0 ; i < len ; i++) {
        output[i * step_out] = input[i * step_in] * C;
    }
    return ESP_OK;
}

References C, ESP_ERR_DSP_PARAM_OUTOFRANGE, and ESP_OK.

Referenced by audio_read_task(), audio_read_task(), audio_read_task(), dspm::Mat::operator*=(), and dspm::Mat::operator/=().

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dsps_mulc_s16_ae32()

esp_err_t dsps_mulc_s16_ae32	(	const int16_t *	input,
		int16_t *	output,
		int	len,
		int16_t	C,
		int	step_in,
		int	step_out )

References C.

dsps_mulc_s16_ansi()

esp_err_t dsps_mulc_s16_ansi	(	const int16_t *	input,
		int16_t *	output,
		int	len,
		int16_t	C,
		int	step_in,
		int	step_out )

Definition at line 17 of file dsps_mulc_s16_ansi.c.

{
    if (NULL == input) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == output) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
 
    for (int i = 0 ; i < len ; i++) {
        int32_t acc = (int32_t)input[i * step_in] * (int32_t)C;
        output[i * step_out] = (int16_t)(acc >> 15);
    }
    return ESP_OK;
}

References C, ESP_ERR_DSP_PARAM_OUTOFRANGE, and ESP_OK.