105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
// Copyright 2018-2025 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _dsps_biquad_H_
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#define _dsps_biquad_H_
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#include "dsp_err.h"
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#include "dsps_biquad_platform.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**@{*/
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/**
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* @brief IIR filter
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*
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* IIR filter 2nd order direct form II (bi quad)
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* The extension (_ansi) use ANSI C and could be compiled and run on any platform.
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* The extension (_ae32) is optimized for ESP32 chip.
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*
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* @param[in] input: input array
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* @param output: output array
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* @param len: length of input and output vectors
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* @param coef: array of coefficients. b0,b1,b2,a1,a2
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* expected that a0 = 1. b0..b2 - numerator, a0..a2 - denominator
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* @param w: delay line w0,w1. Length of 2.
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* @return
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* - ESP_OK on success
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* - One of the error codes from DSP library
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*/
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esp_err_t dsps_biquad_f32_ansi(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_f32_ae32(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_f32_aes3(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_f32_arp4(const float *input, float *output, int len, float *coef, float *w);
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/**@}*/
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/**@{*/
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/**
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* @brief IIR filter for stereo data
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*
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* IIR filter 2nd order direct form II (bi quad)
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* The extension (_ansi) use ANSI C and could be compiled and run on any platform.
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* The extension (_ae32) is optimized for ESP32 chip.
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*
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* @param[in] input: input array of two channels: L/R/L/R/L/R
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* @param output: output array of two channels: L/R/L/R/L/R
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* @param len: number of samples in one channel
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* @param coef: array of coefficients. b0,b1,b2,a1,a2
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* expected that a0 = 1. b0..b2 - numerator, a0..a2 - denominator
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* @param w: delay line w0,w1,w2,w3. Length of 4. w0,w1 - channel0, w2,w3 - channel1
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* @return
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* - ESP_OK on success
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* - One of the error codes from DSP library
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*/
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esp_err_t dsps_biquad_sf32_ansi(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_sf32_ae32(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_sf32_aes3(const float *input, float *output, int len, float *coef, float *w);
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esp_err_t dsps_biquad_sf32_arp4(const float *input, float *output, int len, float *coef, float *w);
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/**@}*/
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#ifdef __cplusplus
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}
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#endif
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#if CONFIG_DSP_OPTIMIZED
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#if (dsps_biquad_f32_ae32_enabled == 1)
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#define dsps_biquad_f32 dsps_biquad_f32_ae32
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#define dsps_biquad_sf32 dsps_biquad_sf32_ae32
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#elif (dsps_biquad_f32_aes3_enabled == 1)
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#define dsps_biquad_f32 dsps_biquad_f32_aes3
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#define dsps_biquad_sf32 dsps_biquad_sf32_ae32
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#elif (dsps_biquad_f32_arp4_enabled == 1)
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#define dsps_biquad_f32 dsps_biquad_f32_arp4
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#define dsps_biquad_sf32 dsps_biquad_sf32_arp4
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#else
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#define dsps_biquad_f32 dsps_biquad_f32_ansi
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#define dsps_biquad_sf32 dsps_biquad_sf32_ansi
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#endif
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#else // CONFIG_DSP_OPTIMIZED
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#define dsps_biquad_f32 dsps_biquad_f32_ansi
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#define dsps_biquad_sf32 dsps_biquad_sf32_ansi
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#endif // CONFIG_DSP_OPTIMIZED
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#endif // _dsps_biquad_H_
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