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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2011 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ---------- para_bp2~ - parametric bandpass 2. order ----------- */
typedef struct _para_bp2_tilde
{
t_object x_obj;
t_float wn1;
t_float wn2;
t_float a0;
t_float a1;
t_float a2;
t_float b1;
t_float b2;
t_float sr;
t_float cur_f;
t_float cur_l;
t_float cur_a;
t_float cur_g;
t_float delta_f;
t_float delta_a;
t_float delta_g;
t_float end_f;
t_float end_a;
t_float end_g;
t_float ticks_per_interpol_time;
t_float rcp_ticks;
t_float interpol_time;
int ticks;
int counter_f;
int counter_a;
int counter_g;
int event_mask;
void *x_debug_outlet;
t_atom x_at[5];
t_float x_float_sig_in;
} t_para_bp2_tilde;
static t_class *para_bp2_tilde_class;
static void para_bp2_tilde_calc(t_para_bp2_tilde *x)
{
t_float l, al, gal, l2, rcp;
l = x->cur_l;
l2 = l*l + 1.0f;
al = l*x->cur_a;
gal = al*x->cur_g;
rcp = 1.0f/(al + l2);
x->a0 = rcp*(l2 + gal);
x->a1 = rcp*2.0f*(2.0f - l2);
x->a2 = rcp*(l2 - gal);
x->b1 = -x->a1;
x->b2 = rcp*(al - l2);
}
static void para_bp2_tilde_dsp_tick(t_para_bp2_tilde *x)
{
if(x->event_mask)
{
t_float discriminant;
if(x->counter_f)
{
t_float l, si, co;
if(x->counter_f <= 1)
{
x->cur_f = x->end_f;
x->counter_f = 0;
x->event_mask &= 6;/*set event_mask_bit 0 = 0*/
}
else
{
x->counter_f--;
x->cur_f *= x->delta_f;
}
l = x->cur_f * x->sr;
if(l < 1.0e-20f)
x->cur_l = 1.0e20f;
else if(l > 1.57079632f)
x->cur_l = 0.0f;
else
{
si = sin(l);
co = cos(l);
x->cur_l = co/si;
}
}
if(x->counter_a)
{
if(x->counter_a <= 1)
{
x->cur_a = x->end_a;
x->counter_a = 0;
x->event_mask &= 5;/*set event_mask_bit 1 = 0*/
}
else
{
x->counter_a--;
x->cur_a *= x->delta_a;
}
}
if(x->counter_g)
{
if(x->counter_g <= 1)
{
x->cur_g = x->end_g;
x->counter_g = 0;
x->event_mask &= 3;/*set event_mask_bit 2 = 0*/
}
else
{
x->counter_g--;
x->cur_g *= x->delta_g;
}
}
para_bp2_tilde_calc(x);
/* stability check */
discriminant = x->b1 * x->b1 + 4.0f * x->b2;
if(x->b1 <= -1.9999996f)
x->b1 = -1.9999996f;
else if(x->b1 >= 1.9999996f)
x->b1 = 1.9999996f;
if(x->b2 <= -0.9999998f)
x->b2 = -0.9999998f;
else if(x->b2 >= 0.9999998f)
x->b2 = 0.9999998f;
if(discriminant >= 0.0f)
{
if(0.9999998f - x->b1 - x->b2 < 0.0f)
x->b2 = 0.9999998f - x->b1;
if(0.9999998f + x->b1 - x->b2 < 0.0f)
x->b2 = 0.9999998f + x->b1;
}
}
}
static t_int *para_bp2_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_para_bp2_tilde *x = (t_para_bp2_tilde *)(w[3]);
int i, n = (t_int)(w[4]);
t_float wn0, wn1=x->wn1, wn2=x->wn2;
t_float a0=x->a0, a1=x->a1, a2=x->a2;
t_float b1=x->b1, b2=x->b2;
para_bp2_tilde_dsp_tick(x);
for(i=0; i<n; i++)
{
wn0 = *in++ + b1*wn1 + b2*wn2;
*out++ = a0*wn0 + a1*wn1 + a2*wn2;
wn2 = wn1;
wn1 = wn0;
}
/* NAN protect */
if(IEM_DENORMAL(wn2))
wn2 = 0.0f;
if(IEM_DENORMAL(wn1))
wn1 = 0.0f;
x->wn1 = wn1;
x->wn2 = wn2;
return(w+5);
}
/* yn0 = *out;
xn0 = *in;
*************
yn0 = a0*xn0 + a1*xn1 + a2*xn2 + b1*yn1 + b2*yn2;
yn2 = yn1;
yn1 = yn0;
xn2 = xn1;
xn1 = xn0;
*************************
y/x = (a0 + a1*z-1 + a2*z-2)/(1 - b1*z-1 - b2*z-2);*/
static t_int *para_bp2_tilde_perf8(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_para_bp2_tilde *x = (t_para_bp2_tilde *)(w[3]);
int i, n = (t_int)(w[4]);
t_float wn[10];
t_float a0=x->a0, a1=x->a1, a2=x->a2;
t_float b1=x->b1, b2=x->b2;
para_bp2_tilde_dsp_tick(x);
wn[0] = x->wn2;
wn[1] = x->wn1;
for(i=0; i<n; i+=8, in+=8, out+=8)
{
wn[2] = in[0] + b1*wn[1] + b2*wn[0];
out[0] = a0*wn[2] + a1*wn[1] + a2*wn[0];
wn[3] = in[1] + b1*wn[2] + b2*wn[1];
out[1] = a0*wn[3] + a1*wn[2] + a2*wn[1];
wn[4] = in[2] + b1*wn[3] + b2*wn[2];
out[2] = a0*wn[4] + a1*wn[3] + a2*wn[2];
wn[5] = in[3] + b1*wn[4] + b2*wn[3];
out[3] = a0*wn[5] + a1*wn[4] + a2*wn[3];
wn[6] = in[4] + b1*wn[5] + b2*wn[4];
out[4] = a0*wn[6] + a1*wn[5] + a2*wn[4];
wn[7] = in[5] + b1*wn[6] + b2*wn[5];
out[5] = a0*wn[7] + a1*wn[6] + a2*wn[5];
wn[8] = in[6] + b1*wn[7] + b2*wn[6];
out[6] = a0*wn[8] + a1*wn[7] + a2*wn[6];
wn[9] = in[7] + b1*wn[8] + b2*wn[7];
out[7] = a0*wn[9] + a1*wn[8] + a2*wn[7];
wn[0] = wn[8];
wn[1] = wn[9];
}
/* NAN protect */
if(IEM_DENORMAL(wn[0]))
wn[0] = 0.0f;
if(IEM_DENORMAL(wn[1]))
wn[1] = 0.0f;
x->wn1 = wn[1];
x->wn2 = wn[0];
return(w+5);
}
static void para_bp2_tilde_ft4(t_para_bp2_tilde *x, t_floatarg t)
{
int i = (int)((x->ticks_per_interpol_time)*t);
x->interpol_time = t;
if(i <= 0)
i = 1;
x->ticks = i;
x->rcp_ticks = 1.0f / (t_float)i;
}
static void para_bp2_tilde_ft3(t_para_bp2_tilde *x, t_floatarg l)
{
t_float g = exp(0.11512925465 * l);
if(g != x->cur_g)
{
x->end_g = g;
x->counter_g = x->ticks;
x->delta_g = exp(log(g/x->cur_g)*x->rcp_ticks);
x->event_mask |= 4;/*set event_mask_bit 2 = 1*/
}
}
static void para_bp2_tilde_ft2(t_para_bp2_tilde *x, t_floatarg q)
{
t_float a;
if(q <= 0.0f)
q = 0.000001f;
a = 1.0f/q;
if(a != x->cur_a)
{
x->end_a = a;
x->counter_a = x->ticks;
x->delta_a = exp(log(a/x->cur_a)*x->rcp_ticks);
x->event_mask |= 2;/*set event_mask_bit 1 = 1*/
}
}
static void para_bp2_tilde_ft1(t_para_bp2_tilde *x, t_floatarg f)
{
if(f <= 0.0f)
f = 0.000001f;
if(f != x->cur_f)
{
x->end_f = f;
x->counter_f = x->ticks;
x->delta_f = exp(log(f/x->cur_f)*x->rcp_ticks);
x->event_mask |= 1;/*set event_mask_bit 0 = 1*/
}
}
static void para_bp2_tilde_set(t_para_bp2_tilde *x, t_symbol *s, int argc, t_atom *argv)
{
if((argc >= 2) && IS_A_FLOAT(argv, 1) && IS_A_FLOAT(argv, 0))
{
x->wn1 = (t_float)atom_getfloatarg(0, argc, argv);
x->wn2 = (t_float)atom_getfloatarg(1, argc, argv);
}
}
static void para_bp2_tilde_print(t_para_bp2_tilde *x)
{
// post("fb1 = %g, fb2 = %g, ff1 = %g, ff2 = %g, ff3 = %g", x->b1, x->b2, x->a0, x->a1, x->a2);
x->x_at[0].a_w.w_float = x->b1;
x->x_at[1].a_w.w_float = x->b2;
x->x_at[2].a_w.w_float = x->a0;
x->x_at[3].a_w.w_float = x->a1;
x->x_at[4].a_w.w_float = x->a2;
outlet_list(x->x_debug_outlet, &s_list, 5, x->x_at);
}
static void para_bp2_tilde_dsp(t_para_bp2_tilde *x, t_signal **sp)
{
t_float si, co, f;
int i, n=(int)sp[0]->s_n;
x->sr = 3.14159265358979323846f / (t_float)(sp[0]->s_sr);
x->ticks_per_interpol_time = 0.001f * (t_float)(sp[0]->s_sr) / (t_float)n;
i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
if(i <= 0)
i = 1;
x->ticks = i;
x->rcp_ticks = 1.0f / (t_float)i;
f = x->cur_f * x->sr;
if(f < 1.0e-20f)
x->cur_l = 1.0e20f;
else if(f > 1.57079632f)
x->cur_l = 0.0f;
else
{
si = sin(f);
co = cos(f);
x->cur_l = co/si;
}
if(n&7)
dsp_add(para_bp2_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
else
dsp_add(para_bp2_tilde_perf8, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
}
static void *para_bp2_tilde_new(t_symbol *s, int argc, t_atom *argv)
{
t_para_bp2_tilde *x = (t_para_bp2_tilde *)pd_new(para_bp2_tilde_class);
int i;
t_float si, co, f=0.0f, q=1.0f, l=0.0f, interpol=0.0f;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft3"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft4"));
outlet_new(&x->x_obj, &s_signal);
x->x_debug_outlet = outlet_new(&x->x_obj, &s_list);
x->x_float_sig_in = 0.0f;
x->x_at[0].a_type = A_FLOAT;
x->x_at[1].a_type = A_FLOAT;
x->x_at[2].a_type = A_FLOAT;
x->x_at[3].a_type = A_FLOAT;
x->x_at[4].a_type = A_FLOAT;
x->event_mask = 1;
x->counter_f = 1;
x->counter_a = 0;
x->counter_g = 0;
x->delta_f = 0.0f;
x->delta_a = 0.0f;
x->delta_g = 0.0f;
x->interpol_time = 500.0f;
x->wn1 = 0.0f;
x->wn2 = 0.0f;
x->a0 = 0.0f;
x->a1 = 0.0f;
x->a2 = 0.0f;
x->b1 = 0.0f;
x->b2 = 0.0f;
x->sr = 3.14159265358979323846f / 44100.0f;
x->cur_a = 1.0f;
if((argc == 4)&&IS_A_FLOAT(argv,3)&&IS_A_FLOAT(argv,2)&&IS_A_FLOAT(argv,1)&&IS_A_FLOAT(argv,0))
{
f = (t_float)atom_getfloatarg(0, argc, argv);
q = (t_float)atom_getfloatarg(1, argc, argv);
l = (t_float)atom_getfloatarg(2, argc, argv);
interpol = (t_float)atom_getfloatarg(3, argc, argv);
}
if(f <= 0.0f)
f = 0.000001f;
x->cur_f = f;
f *= x->sr;
if(f < 1.0e-20f)
x->cur_l = 1.0e20f;
else if(f > 1.57079632f)
x->cur_l = 0.0f;
else
{
si = sin(f);
co = cos(f);
x->cur_l = co/si;
}
if(q <= 0.0f)
q = 0.000001f;
x->cur_a = 1.0f/q;
x->cur_g = exp(0.11512925465 * l);
if(interpol <= 0.0f)
interpol = 0.0f;
x->interpol_time = interpol;
x->ticks_per_interpol_time = 0.5f;
i = (int)((x->ticks_per_interpol_time)*(x->interpol_time));
if(i <= 0)
i = 1;
x->ticks = i;
x->rcp_ticks = 1.0f / (t_float)i;
x->end_f = x->cur_f;
x->end_a = x->cur_a;
x->end_g = x->cur_g;
return(x);
}
void para_bp2_tilde_setup(void)
{
para_bp2_tilde_class = class_new(gensym("para_bp2~"), (t_newmethod)para_bp2_tilde_new,
0, sizeof(t_para_bp2_tilde), 0, A_GIMME, 0);
CLASS_MAINSIGNALIN(para_bp2_tilde_class, t_para_bp2_tilde, x_float_sig_in);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_dsp, gensym("dsp"), 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft3, gensym("ft3"), A_FLOAT, 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_ft4, gensym("ft4"), A_FLOAT, 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_set, gensym("set"), A_GIMME, 0);
class_addmethod(para_bp2_tilde_class, (t_method)para_bp2_tilde_print, gensym("print"), 0);
}
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