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-rw-r--r--src/tavg~.c99
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~");
+}