1 files changed, 116 insertions, 0 deletions
diff --git a/src/mavg.c b/src/mavg.c
new file mode 100644
index 0000000..2ed0352
--- /dev/null
+++ b/src/mavg.c
@@ -0,0 +1,116 @@
+/******************************************************
+ *
+ * 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
+ *
+ ******************************************************/
+
+
+#include "zexy.h"
+
+/* mavg :: moving average filter */
+
+static t_class *mavg_class;
+
+typedef struct _mavg
+{
+  t_object x_obj;
+
+  t_float n_inv;
+  t_float avg;
+  int size;
+  t_float *buf, *wp;
+} t_mavg;
+
+static void mavg_resize(t_mavg *x, t_float f)
+{
+  int i;
+  t_float *dumbuf;
+
+  f = (int)f;
+  if ((f<1) || (f == x->size)) return;
+
+  freebytes(x->buf, sizeof(t_float)*x->size);
+  x->n_inv = 1.0/f;
+  x->size = f;
+  x->buf = getbytes(sizeof(t_float)*x->size);
+
+  dumbuf = x->wp = x->buf;
+  i = x->size;
+  while(i--) *dumbuf++ = x->avg;
+}
+
+static void mavg_set(t_mavg *x, t_symbol *s, int argc, t_atom *argv)
+{
+  int i = x->size;
+  t_float *dummy = x->buf;
+  t_float f=(argc)?atom_getfloat(argv):x->avg;
+
+  while (i--) *dummy++=f;
+
+  x->wp = x->buf;
+}
+
+static void mavg_float(t_mavg *x, t_float f)
+{
+  int i = x->size;
+  t_float dummy = 0;
+  t_float *dumb = x->buf;
+
+  *x->wp++ = f;
+  if (x->wp == x->buf + x->size) x->wp = x->buf;
+
+  while (i--) dummy += *dumb++;
+
+  x->avg = dummy*x->n_inv;
+
+  outlet_float(x->x_obj.ob_outlet,x->avg);
+}
+
+static void *mavg_new(t_floatarg f)
+{
+  t_mavg *x = (t_mavg *)pd_new(mavg_class);
+  int i = (f<1)?2:f;
+  t_float *dumbuf;
+
+  outlet_new(&x->x_obj, gensym("float"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym(""));
+
+  x->buf = x->wp = (t_float *)getbytes(sizeof(t_float) * i);
+  x->size = i;
+  x->n_inv = 1.0f/(t_float)i;
+
+  dumbuf = x->buf;
+  while (i--) *dumbuf++=0;
+
+  return (x);
+}
+
+static void mavg_help(void)
+{
+  post("mavg\t:: moving average filter");
+}
+
+void mavg_setup(void)
+{
+  mavg_class = class_new(gensym("mavg"), (t_newmethod)mavg_new, 0,
+			 sizeof(t_mavg), 0, A_DEFFLOAT, 0);
+
+  class_addfloat(mavg_class, (t_method)mavg_float);
+
+  class_addmethod(mavg_class, (t_method)mavg_help, gensym("help"), 0);
+  class_addmethod(mavg_class, (t_method)mavg_set, gensym("set"), A_GIMME, 0);
+  class_addmethod(mavg_class, (t_method)mavg_resize, gensym(""), A_DEFFLOAT, 0);
+
+  class_sethelpsymbol(mavg_class, gensym("zexy/mavg"));
+  zexy_register("mavg");
+}