From d449d31030cfc4a3e06858bf877dcbfacad59f74 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Mon, 9 Jan 2006 21:24:28 +0000
Subject: checked in code from sIgpAck0.03.ZIP; cleaned up comment warnings and
 changed #ifdef NT to #ifdef _MSC_VER; removed sp. prefix and set up for
 namespaces

svn path=/trunk/externals/sigpack/; revision=4381
---
 source/decimate~.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 source/decimate~.c

(limited to 'source/decimate~.c')

diff --git a/source/decimate~.c b/source/decimate~.c
new file mode 100644
index 0000000..b7fb073
--- /dev/null
+++ b/source/decimate~.c
@@ -0,0 +1,76 @@
+/* sIgpAck
+ * for
+ * pure-data
+ * www.weiss-archiv.de */
+
+#include "m_pd.h"
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+// ------------------------ sp.decimate~ ----------------------------- 
+// signal decimation
+// code from musicdsp.org posted by tobybear 
+
+static t_class *decimate_tilde_class;
+
+typedef struct _decimate_tilde
+{
+    t_object x_obj;
+	t_sample x_rate;
+	t_sample x_bits;
+	float x_f;
+} t_decimate_tilde;
+
+static void *decimate_tilde_new(t_floatarg rate, t_floatarg bits)
+{
+    t_decimate_tilde *x = (t_decimate_tilde *)pd_new(decimate_tilde_class);
+	x->x_rate = rate;
+	x->x_bits = bits;
+    outlet_new(&x->x_obj, gensym("signal"));
+	floatinlet_new(&x->x_obj, &x->x_rate);
+	floatinlet_new(&x->x_obj, &x->x_bits);
+	x->x_f = 0;
+	if (rate) x->x_rate = rate;
+	else x->x_rate = 0.5;
+	if (bits) x->x_bits = bits;
+	else x->x_bits = 16;
+    return (x);
+}
+
+static t_int *decimate_tilde_perform(t_int *w)
+{
+	t_decimate_tilde *x = (t_decimate_tilde *)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    int n = (int)(w[4]);
+	float f;
+	long int m=1<<(int)(x->x_bits-1);
+	float y=0, cnt=0;
+    while (n--)
+    {
+		f = *in++;
+		cnt+=x->x_rate;
+		if (cnt>=1)
+		{
+			cnt-=1;
+			y=(long int)(f*m)/(float)m;
+		}
+		*out++ = y;
+    }
+    return (w+5);
+}
+
+static void decimate_tilde_dsp(t_decimate_tilde *x, t_signal **sp)
+{
+    dsp_add(decimate_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void decimate_tilde_setup(void)
+{
+    decimate_tilde_class = class_new(gensym("sp.decimate~"), (t_newmethod)decimate_tilde_new, 0,
+    	sizeof(t_decimate_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(decimate_tilde_class, t_decimate_tilde, x_f);
+    class_addmethod(decimate_tilde_class, (t_method)decimate_tilde_dsp, gensym("dsp"), 0);
+}
-- 
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