1 files changed, 99 insertions, 0 deletions
diff --git a/src/tavg~.c b/src/tavg~.c
new file mode 100644
index 0000000..cddbd41
--- /dev/null
+++ b/src/tavg~.c
@@ -0,0 +1,99 @@
+/******************************************************
+ *
+ * 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"
+#include <math.h>
+
+#ifdef NT
+#define sqrtf sqrt
+#endif
+
+#ifdef MACOSX
+#define sqrtf sqrt
+#endif
+
+
+
+/* triggered average :: arithmetic mean between last and current BANG */
+
+static t_class *tavg_class;
+
+typedef struct _tavg
+{
+  t_object x_obj;
+  t_float n_inv;
+  t_float buf;
+  int blocks;
+} t_tavgtilde;
+
+
+static void tavg_bang(t_tavgtilde *x)
+{
+  if (x->blocks) {
+    outlet_float(x->x_obj.ob_outlet, x->buf*x->n_inv/x->blocks);
+    x->blocks = 0;
+    x->buf = 0.;
+  }
+}
+
+static t_int *tavg_perform(t_int *w)
+{
+    t_float *in = (t_float *)(w[1]);
+	t_tavgtilde *x = (t_tavgtilde *)w[2];
+    int n = (int)(w[3]);
+
+	t_float buf = x->buf;
+
+    while (n--) buf += *in++;
+
+	x->buf = buf;
+	x->blocks++;
+
+    return (w+4);
+}
+
+static void tavg_dsp(t_tavgtilde *x, t_signal **sp)
+{
+	x->n_inv=1./sp[0]->s_n;
+    dsp_add(tavg_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void *tavg_new(void)
+{
+    t_tavgtilde *x = (t_tavgtilde *)pd_new(tavg_class);
+    outlet_new(&x->x_obj, gensym("float"));
+    return (x);
+}
+
+static void tavg_help(void)
+{
+	post("tavg~\t\t:: outputs the arithmetic mean of a signal when triggered");
+	post("<bang>\t\t:  triggers the output");
+}
+
+void tavg_tilde_setup(void)
+{
+    tavg_class = class_new(gensym("tavg~"), (t_newmethod)tavg_new, 0,
+    	sizeof(t_tavgtilde), 0, A_DEFFLOAT, 0);
+    class_addmethod(tavg_class, nullfn, gensym("signal"), 0);
+    class_addmethod(tavg_class, (t_method)tavg_dsp, gensym("dsp"), 0);
+
+	class_addbang(tavg_class, tavg_bang);
+
+	class_addmethod(tavg_class, (t_method)tavg_help, gensym("help"), 0);
+	class_sethelpsymbol(tavg_class, gensym("zexy/tavg~"));
+  zexy_register("tavg~");
+}