106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/*
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* Copyright (C) 2017 XRADIO TECHNOLOGY CO., LTD. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name of XRADIO TECHNOLOGY CO., LTD. nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EQ_H_
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#define _EQ_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* EQ filter type definition */
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typedef enum {
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/* low pass shelving filter */
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LOWPASS_SHELVING,
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/* band pass peak filter */
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BANDPASS_PEAK,
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/* high pass shelving filter */
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HIHPASS_SHELVING,
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LOWPASS,
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HIGHPASS
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} eq_ftype_t;
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/* equalizer parameters */
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typedef struct {
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/* boost/cut gain in dB */
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float G;
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/* cutoff/center frequency in Hz */
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int fc;
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/* quality factor */
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float Q;
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/* filter type */
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eq_ftype_t type;
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} eq_core_prms_t;
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typedef struct {
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/*num of items(biquad)*/
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int biq_num;
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/* sampling rate */
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int sampling_rate;
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/* channel num */
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int chan;
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/* eq parameters for generate IIR coeff*/
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eq_core_prms_t *core_prms;
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} eq_prms_t;
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typedef struct {
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int biq_num; /*num of items(biquad)*/
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eq_core_prms_t *core_params;
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} eq_user_params_t;
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/**
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* @brief Create the equalizer object
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* @param[in] params Desired frequency response array
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* @retval The equalizer handle
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*/
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void *eq_create(void *params);
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/**
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* @brief Equalizer processing function
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* @handle[in] handle Equalzier handle
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* @handle[in,out] x Input signal
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* @handle[in] len Input length(in samples)
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* @retval None
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*/
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void eq_process(void *handle, short *x, int len);
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/**
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* @brief Destroy the equalizer object
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* @param[in] handle Equalizer handle
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* @retval None
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*/
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void eq_destroy(void *handle);
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#ifdef __cplusplus
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}
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#endif
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#endif
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