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#include "MSPd.h"
/*
IMPLEMENT ELLIPTICAL FILTERS FROM CMIX
*/
#define OBJECT_NAME "killdc~"
#if __MSP__
void *killdc_class;
#endif
#if __PD__
static t_class *killdc_class;
#endif
#define FUNC_LEN (512)
#define MAXSECTS 20
typedef struct {
float ps[4][MAXSECTS];
float c[4][MAXSECTS];
int nsects ;
float xnorm;
} COEFS ;
typedef struct _killdc
{
#if __MSP__
t_pxobject x_obj;
#endif
#if __PD__
t_object x_obj;
float x_f;
#endif
COEFS fdata;
} t_killdc;
void *killdc_new(t_symbol *s);
t_int *offset_perform(t_int *w);
t_int *killdc_perform(t_int *w);
void killdc_dsp(t_killdc *x, t_signal **sp, short *count);
void killdc_assist(t_killdc *x, void *b, long m, long a, char *s);
#define DEFAULT_DSP_FREE 0
#if __MSP__
void main(void)
{
setup((t_messlist **)&killdc_class, (method)killdc_new, (method)dsp_free, (short)sizeof(t_killdc), 0L, A_DEFSYM, 0);
addmess((method)killdc_dsp, "dsp", A_CANT, 0);
addmess((method)killdc_assist,"assist",A_CANT,0);
post("%s %s",OBJECT_NAME, LYONPOTPOURRI_MSG);
dsp_initclass();
}
#endif
#if __PD__
void killdc_tilde_setup(void)
{
killdc_class = class_new(gensym("killdc~"),(t_newmethod)killdc_new,DEFAULT_DSP_FREE,
sizeof(t_killdc), 0, A_DEFSYMBOL,0);
CLASS_MAINSIGNALIN(killdc_class,t_killdc, x_f );
class_addmethod(killdc_class,(t_method)killdc_dsp,gensym("dsp"),A_CANT,0);
class_addmethod(killdc_class,(t_method)killdc_assist,gensym("assist"),A_CANT,0);
post("%s %s",OBJECT_NAME, LYONPOTPOURRI_MSG);
}
#endif
void killdc_assist (t_killdc *x, void *b, long msg, long arg, char *dst)
{
if (msg==1) {
switch (arg) {
case 0:
sprintf(dst,"(signal) Input");
break;
}
} else if (msg==2) {
sprintf(dst,"(signal) Output");
}
}
void *killdc_new(t_symbol *s)
{
int i, j;
#if __MSP__
t_killdc *x = (t_killdc *)newobject(killdc_class);
dsp_setup((t_pxobject *)x,1);
outlet_new((t_pxobject *)x, "signal");
#endif
#if __PD__
t_killdc *x = (t_killdc *)pd_new(killdc_class);
outlet_new(&x->x_obj, gensym("signal"));
#endif
/**************/
x->fdata.nsects = 3;
x->fdata.c[0][0] = -1.9999995 ;
x->fdata.c[1][0] = -1.9997407 ;
x->fdata.c[2][0] = 1.0000000 ;
x->fdata.c[3][0] = 0.99974253 ;
x->fdata.c[0][1] = -1.9999997 ;
x->fdata.c[1][1] = -1.9988353 ;
x->fdata.c[2][1] = 1.0000000 ;
x->fdata.c[3][1] = 0.99883796 ;
x->fdata.c[0][2] = -2.0000000 ;
x->fdata.c[1][2] = -1.9959218 ;
x->fdata.c[2][2] = 1.0000000 ;
x->fdata.c[3][2] = 0.99592773 ;
for(i=0; i< x->fdata.nsects; i++) {
for(j=0;j<4;j++) {
x->fdata.ps[j][i] = 0.0;
}
}
x->fdata.xnorm = 0.99725327e+00 ;
// INITIALIZATIONS
return (x);
}
// method from Paul Lansky's cmix implementation
t_int *killdc_perform(t_int *w)
{
t_float *in1,*out;
float sample ;
int n;
int m;
float op;
// int lcount = 0;
/********/
t_killdc *x = (t_killdc *) (w[1]);
in1 = (t_float *)(w[2]);
out = (t_float *)(w[3]);
n = (int)(w[4]);
while (n--) {
sample = *in1++;
for(m=0; m< x->fdata.nsects;m++) {
op = sample + x->fdata.c[0][m] * x->fdata.ps[0][m] +
x->fdata.c[2][m] * x->fdata.ps[1][m]
- x->fdata.c[1][m] * x->fdata.ps[2][m]
- x->fdata.c[3][m] * x->fdata.ps[3][m];
x->fdata.ps[1][m] = x->fdata.ps[0][m];
x->fdata.ps[0][m] = sample;
x->fdata.ps[3][m] = x->fdata.ps[2][m];
x->fdata.ps[2][m] = op;
sample = op;
}
*out++ = sample * x->fdata.xnorm ;
}
return (w+5);
}
void killdc_dsp(t_killdc *x, t_signal **sp, short *count)
{
// long i;
dsp_add(killdc_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
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