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_zdelay.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/z_zdelay.c

(limited to 'src/z_zdelay.c')

diff --git a/src/z_zdelay.c b/src/z_zdelay.c
new file mode 100644
index 0000000..1c4f1ed
--- /dev/null
+++ b/src/z_zdelay.c
@@ -0,0 +1,120 @@
+/*
+	here we do some sample-wise delay, so you can do your own FIR-filter-designs
+	here are :: "z^(-1)", "z^(-N)"
+	to do :: a "lattice~" section ...
+
+	1302:forum::für::umläute:2000
+*/
+
+#include "zexy.h"
+
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ----------------------------------------------------- */
+
+static t_class *zNdelay_class;
+
+typedef struct _zNdelay
+{
+  t_object x_obj;
+
+  t_float *buf;
+  int bufsize, phase;
+
+} t_zNdelay;
+
+static void zdel_float(t_zNdelay *x, t_floatarg f)
+{
+  int i = f+1;
+  if (i<1)i=1;
+  if (i==x->bufsize)return;
+  freebytes(x->buf, x->bufsize*sizeof(t_float));
+  x->bufsize=i;
+  x->buf=(t_float *)getbytes(x->bufsize*sizeof(t_float));
+  x->phase=0;
+}
+
+static t_int *zN_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_zNdelay *x = (t_zNdelay *)(w[3]);
+  int n = (int)(w[4]);
+
+  t_float *buf = x->buf;
+  int bufsize=x->bufsize, ph=x->phase;
+
+  if (bufsize==1) {
+    if (in!=out)while(n--)*out++=*in++;
+  } else if (bufsize==2) {
+    register t_float f, last=*buf;
+    while(n--){
+      f=*in++;
+      *out++=last;
+      last=f;
+    }
+    *buf=last;
+  } else {
+    while (n--) {
+      *(buf+ph++) = *in++;
+      *out++    = buf[ph%=bufsize];
+    }
+    x->phase=ph;
+  }
+  return (w+5);
+}
+
+
+static void zNdelay_dsp(t_zNdelay *x, t_signal **sp)
+{
+  dsp_add(zN_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *zNdelay_new(t_floatarg f)
+{
+  t_zNdelay *x = (t_zNdelay *)pd_new(zNdelay_class);
+  int i = f;
+  t_float *b;
+
+  if (i<=0) i=1;
+  i++;
+
+  x->bufsize = i;
+  x->buf = (t_float *)getbytes(sizeof(t_float) * x->bufsize);
+  b=x->buf;
+  while (i--) {
+    *b++=0;
+  }
+  x->phase = 0;
+
+  outlet_new(&x->x_obj, gensym("signal")); 
+  return (x);
+}
+
+static void zNdelay_free(t_zNdelay *x)
+{
+  freebytes(x->buf, sizeof(t_float) * x->bufsize);
+}
+
+
+static void zdel_helper(void)
+{
+  post("\n%c z~\t:: samplewise delay", HEARTSYMBOL);
+  post("creation :: 'z~ [<n>]' : creates a <n>-sample delay; default is 1");
+}
+
+
+void z_zdelay_setup(void)
+{
+  zNdelay_class = class_new(gensym("z~"), (t_newmethod)zNdelay_new, (t_method)zNdelay_free,
+			    sizeof(t_zNdelay), 0, A_DEFFLOAT, 0);
+  class_addmethod(zNdelay_class, nullfn, gensym("signal"), 0);
+  class_addmethod(zNdelay_class, (t_method)zNdelay_dsp, gensym("dsp"), 0);
+
+  class_addfloat(zNdelay_class, zdel_float);
+  class_addmethod(zNdelay_class, (t_method)zdel_helper, gensym("help"), 0);
+  class_sethelpsymbol(zNdelay_class, gensym("zexy/z~"));
+}
-- 
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