1 files changed, 100 insertions, 0 deletions
diff --git a/source/freqdiv~.c b/source/freqdiv~.c
new file mode 100644
index 0000000..fa6ba12
--- /dev/null
+++ b/source/freqdiv~.c
@@ -0,0 +1,100 @@
+/* sIgpAck
+ * for
+ * pure-data
+ * www.weiss-archiv.de */
+
+#include "m_pd.h"
+#include <math.h>
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ------------------------ sp.freqdiv~ ----------------------------- */
+/* frequency divider */
+/* code from swh_plugins by steve harris www.plugins.org.uk */
+
+static t_class *freqdiv_tilde_class;
+
+typedef struct _freqdiv_tilde
+{
+    t_object x_obj;
+	t_sample x_denominate;
+	t_sample x_amp;
+	float x_count;
+	t_sample x_lamp;
+	t_sample x_last;
+	t_sample x_out;
+	int x_zeroxs;
+	float x_f;
+} t_freqdiv_tilde;
+
+static void *freqdiv_tilde_new(t_floatarg denominate)
+{
+    t_freqdiv_tilde *x = (t_freqdiv_tilde *)pd_new(freqdiv_tilde_class);
+	x->x_denominate = denominate;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_denominate);
+	x->x_f = 0;
+	x->x_amp = 0;
+	x->x_count = 0;
+	x->x_lamp = 0;
+	x->x_last = 0;
+	x->x_out = 0;
+	x->x_zeroxs = 0;
+	if (denominate) x->x_denominate = denominate;
+	else x->x_denominate = 1;
+    return (x);
+}
+
+static t_int *freqdiv_tilde_perform(t_int *w)
+{
+	t_freqdiv_tilde *x = (t_freqdiv_tilde *)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    int n = (int)(w[4]);
+	float f;
+	int den = (int)x->x_denominate;
+    while (n--)
+    {
+		f = *in++;
+		x->x_count += 1.0f;
+		if ((f > 0.0f && x->x_last <= 0.0f) || (f < 0.0f && x->x_last >= 0.0))
+		{
+			x->x_zeroxs++;
+			if (den == 1)
+			{
+				x->x_out = x->x_out > 0.0f ? -1.0f : 1.0f;
+				x->x_lamp = x->x_amp / x->x_count;
+				x->x_zeroxs = 0;
+				x->x_count = 0;
+				x->x_amp = 0;
+			}
+		}
+		x->x_amp += fabs(f);
+		if (den > 1 && (x->x_zeroxs % den) == den-1)
+		{
+			x->x_out = x->x_out > 0.0f ? -1.0f : 1.0f;
+			x->x_lamp = x->x_amp / x->x_count;
+			x->x_zeroxs = 0;
+			x->x_count = 0;
+			x->x_amp = 0;
+		}
+		x->x_last = f;
+		*out++ = x->x_out * x->x_lamp;
+    }
+    return (w+5);
+}
+
+static void freqdiv_tilde_dsp(t_freqdiv_tilde *x, t_signal **sp)
+{
+    dsp_add(freqdiv_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void freqdiv_tilde_setup(void)
+{
+    freqdiv_tilde_class = class_new(gensym("sp.freqdiv~"), (t_newmethod)freqdiv_tilde_new, 0,
+    	sizeof(t_freqdiv_tilde), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(freqdiv_tilde_class, t_freqdiv_tilde, x_f);
+    class_addmethod(freqdiv_tilde_class, (t_method)freqdiv_tilde_dsp, gensym("dsp"), 0);
+}