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-rw-r--r--src/pdf~.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/pdf~.c b/src/pdf~.c
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index 0000000..ef06a59
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+++ b/src/pdf~.c
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+/******************************************************
+ *
+ * zexy - implementation file
+ *
+ * copyleft (c) IOhannes m zmölnig
+ *
+ * 1999:forum::für::umläute:2004
+ *
+ * institute of electronic music and acoustics (iem)
+ *
+ ******************************************************
+ *
+ * license: GNU General Public License v.2
+ *
+ ******************************************************/
+
+/* get the ProbabilityDensityFunction of a signal */
+
+#include "zexy.h"
+
+/* ------------------------ pdf~ ----------------------------- */
+
+static t_class *pdf_class;
+
+typedef struct _pdf
+{
+ t_object x_obj;
+
+ t_float *buf;
+ int size;
+ t_float halfsize;
+} t_pdf;
+
+static void clear_pdfbuf(t_pdf *x)
+{
+ int n = x->size;
+ t_float *buf = x->buf;
+
+ while (n--) *buf++=0.;
+}
+
+static void pdf_bang(t_pdf *x)
+{
+ int n = x->size;
+ t_float *buf = x->buf, max = 0;
+ t_atom a[2];
+
+ while (n--) if (max < *buf++) max = buf[-1];
+
+ n=x->size;
+ buf = x->buf;
+
+ if (max==0.) max=1.;
+ max = 1./max;
+
+ while (n--)
+ {
+ SETFLOAT(a, *buf++*max);
+ SETFLOAT(a+1,x->size-n-1);
+ outlet_list(x->x_obj.ob_outlet, &s_list, 2, (t_atom*)&a);
+ }
+}
+
+static void pdf_float(t_pdf *x, t_floatarg f)
+{
+ if (f) pdf_bang(x); else clear_pdfbuf(x);
+}
+
+static t_int *pdf_perform(t_int *w)
+{
+ t_float *in = (t_float *)(w[1]);
+ t_pdf *x = (t_pdf *)(w[2]);
+ int n = (int)(w[3]);
+
+ t_float *buf = x->buf;
+ t_float halfsize = x->halfsize;
+
+ while (n--)
+ {
+ t_float f = *in++;
+ int iindex = ((f + 1.0) * halfsize)+0.5;
+ buf[(iindex<0)?0:((iindex>=x->size)?x->size-1:iindex)]+=1.;
+ }
+ return (w+4);
+}
+
+static void pdf_dsp(t_pdf *x, t_signal **sp)
+{
+ x->halfsize = (x->size - 1) / 2.0;
+
+ dsp_add(pdf_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void *pdf_new(t_floatarg f)
+{
+ int i = f;
+ t_pdf *x = (t_pdf *)pd_new(pdf_class);
+ t_float *buf;
+
+ x->size = (i)?i:64;
+ x->buf = (t_float *)getbytes(x->size * sizeof(t_float));
+ buf = x->buf;
+ clear_pdfbuf(x);
+
+ outlet_new(&x->x_obj, &s_list);
+
+ return (x);
+}
+
+static void pdf_free(t_pdf *x)
+{
+ freebytes(x->buf, x->size*sizeof(t_float));
+}
+
+static void helper(void)
+{
+ post("\n%c pdf~\t:: get the probability density function of a signal (-1.0 to +1.0)", HEARTSYMBOL);
+ post("'bang'\t : output a list of the probabilities of 'n' function values"
+ "\n'clear'\t : clear the buffer (set all probabilities to zero)"
+ "\n<1/0>\t : short for 'bang' and 'clear'"
+ "\n'help'\t : view this");
+ post("creation :: 'pdf~ [<n>]':: get the pdf for <n> (default: 64) values");
+}
+
+void pdf_tilde_setup(void)
+{
+ pdf_class = class_new(gensym("pdf~"), (t_newmethod)pdf_new, (t_method)pdf_free,
+ sizeof(t_pdf), 0, A_DEFFLOAT, 0);
+
+ class_addmethod(pdf_class, nullfn, gensym("signal"), 0);
+ class_addmethod(pdf_class, (t_method)pdf_dsp, gensym("dsp"), 0);
+
+ class_addmethod(pdf_class, (t_method)pdf_bang, gensym("bang"), 0);
+ class_addmethod(pdf_class, (t_method)clear_pdfbuf, gensym("clear"), 0);
+ class_addfloat(pdf_class, pdf_float);
+
+ class_addmethod(pdf_class, (t_method)helper, gensym("help"), 0);
+ class_sethelpsymbol(pdf_class, gensym("zexy/pdf~"));
+ zexy_register("pdf~");
+}