apps/plugins/pdbox/PDa/intern/hip~.c

   1 #include "../src/m_pd.h"
   2 #include <../src/m_fixed.h>
   3
   4 typedef struct hipctl
   5 {
   6     t_sample c_x;
   7     t_sample c_coef;
   8 } t_hipctl;
   9
  10 typedef struct sighip
  11 {
  12     t_object x_obj;
  13     float x_sr;
  14     float x_hz;
  15     t_hipctl x_cspace;
  16     t_hipctl *x_ctl;
  17     float x_f;
  18 } t_sighip;
  19
  20 t_class *sighip_class;
  21 static void sighip_ft1(t_sighip *x, t_floatarg f);
  22
  23 static void *sighip_new(t_floatarg f)
  24 {
  25     t_sighip *x = (t_sighip *)pd_new(sighip_class);
  26     inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
  27     outlet_new(&x->x_obj, gensym("signal"));
  28     x->x_sr = 44100;
  29     x->x_ctl = &x->x_cspace;
  30     x->x_cspace.c_x = 0;
  31     sighip_ft1(x, f);
  32     x->x_f = 0;
  33     return (x);
  34 }
  35
  36 static void sighip_ft1(t_sighip *x, t_floatarg f)
  37 {
  38     t_float coeff;
  39     if (f < 0.001) f = 10;
  40     x->x_hz = f;
  41     coeff = 1 - f * (2 * 3.14159) / x->x_sr;
  42     if (coeff < 0) coeff = 0;
  43     x->x_ctl->c_coef = ftofix(coeff);
  44 }
  45
  46 static t_int *sighip_perform(t_int *w)
  47 {
  48     t_sample *in = (t_sample *)(w[1]);
  49     t_sample *out = (t_sample *)(w[2]);
  50     t_hipctl *c = (t_hipctl *)(w[3]);
  51     int n = (t_int)(w[4]);
  52     int i;
  53     t_sample last = c->c_x;
  54     t_sample coef = c->c_coef;
  55     for (i = 0; i < n; i++)
  56     {
  57         t_sample new = *in++ + mult(coef,last);
  58         *out++ = new - last;
  59         last = new;
  60     }
  61     if (PD_BADFLOAT(last))
  62         last = 0;
  63     c->c_x = last;
  64     return (w+5);
  65 }
  66
  67 static void sighip_dsp(t_sighip *x, t_signal **sp)
  68 {
  69     x->x_sr = sp[0]->s_sr;
  70     sighip_ft1(x,  x->x_hz);
  71     dsp_add(sighip_perform, 4,
  72         sp[0]->s_vec, sp[1]->s_vec,
  73             x->x_ctl, sp[0]->s_n);
  74
  75 }
  76
  77 static void sighip_clear(t_sighip *x, t_floatarg q)
  78 {
  79 #ifdef ROCKBOX
  80     (void) q;
  81 #endif
  82     x->x_cspace.c_x = 0;
  83 }
  84
  85 void hip_tilde_setup(void)
  86 {
  87     sighip_class = class_new(gensym("hip~"), (t_newmethod)sighip_new, 0,
  88         sizeof(t_sighip), 0, A_DEFFLOAT, 0);
  89     CLASS_MAINSIGNALIN(sighip_class, t_sighip, x_f);
  90     class_addmethod(sighip_class, (t_method)sighip_dsp, gensym("dsp"), 0);
  91     class_addmethod(sighip_class, (t_method)sighip_ft1,
  92         gensym("ft1"), A_FLOAT, 0);
  93     class_addmethod(sighip_class, (t_method)sighip_clear, gensym("clear"), 0);
  94     class_sethelpsymbol(sighip_class, gensym("lop~-help.pd"));
  95 }
  96