From d2eec74a4d8c21aad495ba61539486b24d7ab8dc Mon Sep 17 00:00:00 2001
From: Guenter  Geiger <ggeiger@users.sourceforge.net>
Date: Wed, 9 Oct 2002 10:19:04 +0000
Subject: moved from zexy/zexy to zexy

svn path=/trunk/externals/zexy/; revision=169
---
 src/z_quantize.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/z_quantize.c

(limited to 'src/z_quantize.c')

diff --git a/src/z_quantize.c b/src/z_quantize.c
new file mode 100644
index 0000000..a66c1eb
--- /dev/null
+++ b/src/z_quantize.c
@@ -0,0 +1,99 @@
+/*
+	the long waited for quantize~-object that quantizes in many possible (but equal) steps
+	of course, we´ll make a comfortable quantize of the float-signal for 16bit and 8bit
+
+	1110:forum::für::umläute:1999
+  */
+
+#include "zexy.h"
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ------------------------ quantize~ ----------------------------- */
+
+static t_class *quantize_class;
+
+typedef struct _quantize
+{
+    t_object x_obj;
+	t_float quantiz, dequantiz;
+} t_quantize;
+
+static void quantize_float(t_quantize *x, t_floatarg f)
+{
+	x->quantiz   = f;
+	x->dequantiz = 1./f;
+}
+
+static void quantize_16bit(t_quantize *x)
+{
+	x->quantiz   = 32768.;
+	x->dequantiz = 1./32768.;
+}
+
+static void quantize_8bit(t_quantize *x)
+{
+	x->quantiz   = 128.;
+	x->dequantiz = 1./128.;
+}
+
+static t_int *quantize_perform(t_int *w)
+{
+	t_quantize	*x = (t_quantize *)(w[1]);
+    t_float *in = (t_float *)(w[2]);
+    t_float *out = (t_float *)(w[3]);
+    int n = (int)(w[4]);
+
+	t_float quantiz = x->quantiz, dequantiz = x->dequantiz;
+
+	if (quantiz)
+		while (n--) *out++ = dequantiz*(int)(quantiz**in++);
+	else while (n--) *out++ = *in++;
+
+	return (w+5);
+}
+
+static void quantize_dsp(t_quantize *x, t_signal **sp)
+{
+    dsp_add(quantize_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+static void helper(t_quantize *x)
+{
+	post("%c quantize~-object\t:: used for quantizing signals by various degrees", HEARTSYMBOL);
+	post("<quants> : quantize a signal into <quants> steps ('0' turns quantizing off)\n"
+		 "'8bit'   : quantize to 8 bit\n"
+		 "'16bit'  : quantize to 16 bit (default)\n"
+		 "'float'  : pass-through the signal unchanged\n"
+		 "'help'   : view this\n"
+		 "signal~\n");
+	post("creation:: \"quantize~ [<quants>]\"");
+
+}
+
+static void *quantize_new(t_floatarg f)
+{
+    t_quantize *x = (t_quantize *)pd_new(quantize_class);
+    outlet_new(&x->x_obj, gensym("signal"));
+	if (f) quantize_float(x, f);
+	else quantize_16bit(x);
+	
+    return (x);
+}
+
+void z_quantize_setup(void)
+{
+    quantize_class = class_new(gensym("quantize~"), (t_newmethod)quantize_new, 0,
+    	sizeof(t_quantize), 0, A_DEFFLOAT, 0);
+    class_addmethod(quantize_class, nullfn, gensym("signal"), 0);
+    class_addmethod(quantize_class, (t_method)quantize_dsp, gensym("dsp"), 0);
+
+	class_addfloat(quantize_class, quantize_float);
+    class_addmethod(quantize_class, (t_method)quantize_8bit, gensym("8bit"), 0);
+    class_addmethod(quantize_class, (t_method)quantize_16bit, gensym("16bit"), 0);
+
+	class_addmethod(quantize_class, (t_method)helper, gensym("help"), 0);
+	class_sethelpsymbol(quantize_class, gensym("zexy/quantize~"));
+}
-- 
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