110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
// --------------------------------------------------------------
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// --------------------------------------------------------------
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#ifndef _FILTER_H_
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#define _FILTER_H_
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#include "synth_defs.h"
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#define FILTER_RECALC_F_THRESH (0.000)
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#define FILTER_RECALC_Q_THRESH (0.000)
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// --------------------------------------------------------------
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// Types
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// --------------------------------------------------------------
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enum
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{
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VCF_FILTERTYPE_LOWPASS = 0,
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VCF_FILTERTYPE_HIGHPASS,
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VCF_FILTERTYPE_BANDPASS,
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VCF_NUM_FILTERTYPES
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};
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enum
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{
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VCF_FILTERORDER_2 = 0,
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VCF_FILTERORDER_4,
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VCF_NUM_FILTERORDER
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};
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typedef struct _svcf_coef_t
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{
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synth_float_t ak0, ak1, ak2;
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synth_float_t bk0, bk1, bk2;
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} vcf_coef_t;
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typedef struct _svcf_state_t
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{
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synth_float_t xn1, xn2;
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synth_float_t yn1, yn2;
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} vcf_state_t;
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typedef struct _svcf_common_t
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{
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synth_float_t *pLUT_cos;
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synth_float_t *pLUT_sin;
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} vcf_common_t;
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typedef struct _svcf_t
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{
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vcf_common_t *pCom;
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UINT32 id;
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UINT32 type;
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UINT32 order;
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UINT32 num_sections;
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synth_float_t fs;
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vcf_coef_t *pCoef;
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vcf_coef_t *pCoeff_last;
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vcf_state_t pState[FILTER_MAX_ORDER/2];
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synth_float_t pQP_inv[FILTER_MAX_ORDER/2];
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synth_float_t *pOut;
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synth_float_t cv_f_bias;
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synth_float_t cv_q_bias;
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synth_float_t cv_f_last;
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synth_float_t cv_q_last;
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UINT32 req_filter_update;
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UINT32 bufsize;
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synth_float_t num_octaves;
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synth_float_t omega_min;
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synth_float_t omega_max;
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} vcf_t;
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// --------------------------------------------------------------
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#if defined(__cplusplus)
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extern "C" {
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#endif
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// --------------------------------------------------------------
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// Exported functions
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// --------------------------------------------------------------
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void VCF_ModInit(vcf_t *pObj);
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void VCF_ModFree(vcf_t *pObj);
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void VCF_Init(vcf_t *pObj, UINT32 id, vcf_common_t *pCom, synth_float_t fs);
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void VCF_Free(vcf_t *pObj);
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void VCF_SetBufsize(vcf_t *pObj, UINT32 bufsize);
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void VCF_FilterParamUpdate(vcf_t *pObj);
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void VCF_Coeff_update(vcf_t *pObj);
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void VCF_SetFS(vcf_t *pObj, synth_float_t fs);
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void VCF_SetF(vcf_t *pObj, synth_float_t f);
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void VCF_SetQ(vcf_t *pObj, synth_float_t q);
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void VCF_SetType(vcf_t *pObj, UINT32 type);
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void VCF_SetOrder(vcf_t *pObj, UINT32 order);
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synth_float_t VCF_cv2omega(vcf_t *pObj, synth_float_t omega);
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synth_float_t VCF_omega2cv(vcf_t *pObj, synth_float_t cv);
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void VCF_clear_state(vcf_t *pObj);
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void VCF_CalcCoeff(vcf_t *pObj, vcf_coef_t *pCoeff, synth_float_t *pCV_f, synth_float_t *pCV_q, UINT32 len);
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synth_float_t* VCF_ProcessDataV(vcf_t *pObj, synth_float_t *pCV_f, synth_float_t *pCV_q, synth_float_t *pX, UINT32 len);
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#if defined(__cplusplus)
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}
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#endif
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// --------------------------------------------------------------
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#endif // _FILTER_H_
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