/*
 * eq.h
 * Description:
 *
 *  Created on: 2014-10-8
 *      Author: Graydon
 *  Modify:
 */

#ifndef EQ_H_
#define EQ_H_

typedef enum {
	eq_lpf,
	eq_hpf,
	eq_bpf_pq, //(constant skirt gain, peak gain = Q)
	eq_bpf_zero, //(constant 0 dB peak gain)
	eq_notch,
	eq_apf,
	eq_peaking_eq, //peq_peak_3dB
	eq_lowshelf,
	eq_highshelf,
	eq_geq,
	eq_constQ, //peq_zero_3dB
	eq_count,
}eq_type_t;

typedef enum{
         peq_zero_3dB,  //bw at 3dB frequency
         peq_middle,
         peq_peak_3dB, //bw at above or below peaking 3dB frequency
}peq_bw;

/*description: Create ParametricEQ handle.
 *@param1: sample rate
 *@param2: sample number per frame
 *@param3: The number of ParametricEQ sections
 *return: The handle
 */
void* alg_eq_create(int smpRate,int smpNum,int nsections);

/*description: ParametricEQ handle.
 *@param1: sample rate
 *return: none
 */
void alg_eq_destroy(void* h);

/*description: Set ParametricEQ 's param.
 *@param1: ParametricEQ handle
 *@param2: select the section from total sections of ParametricEQ
 *@param3: ParametricEQ's frequency
 *@param4: ParametricEQ's Gain
 *@param5: ParametricEQ's Q
 *return: None
 */
void alg_eq_set_param(void* h,int nsection,eq_type_t type ,int bypass,float freqency,float gain,float Q);

/*description: ParametricEQ process function.
 *@param1: ParametricEQ handle
 *@param2: audio data Input
 *@param3: proceeded data output
 *return: 0-successful
 */
int alg_eq_filter(void* h , const float *data_in, float *data_out);

void callEQcoeffs(eq_type_t type , float f0,float g,float q,int fs, __OUT float *b,__OUT float *a);
void call_peaking_eq2(peq_bw  bw_type ,float fc, float gain, float q, int fs, __OUT float *coef_b, __OUT float *coef_a);
void alg_eq_acc_coeffs(int smpRate, int nsection ,eq_type_t type,float freqency,float gain,float q, __OUT float* pcoeffs);

#endif /* EQ_H_ */