From 6b378329aa20ec2caa3f06968c2ac71d41dca7f9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?=
 <zmoelnig@users.sourceforge.net>
Date: Tue, 17 May 2005 16:50:28 +0000
Subject: renamed *_tilde.c-files to *~.c

svn path=/trunk/externals/zexy/; revision=2998
---
 src/swap~.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/swap~.c

(limited to 'src/swap~.c')

diff --git a/src/swap~.c b/src/swap~.c
new file mode 100644
index 0000000..9f14310
--- /dev/null
+++ b/src/swap~.c
@@ -0,0 +1,101 @@
+/******************************************************
+ *
+ * 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
+ ******************************************************/
+
+/*
+	the long waited for swap~-object that does a byte swap
+	of course, we unfortunately have to quantize the float-signal to 16bit (to get bytes)
+
+	1110:forum::für::umläute:1999
+*/
+
+#include "zexy.h"
+
+/* ------------------------ swap~ ----------------------------- */
+#define FLOAT2SHORT 32768.
+#define SHORT2FLOAT 1./32768.
+
+static t_class *swap_class;
+
+typedef struct _swap
+{
+  t_object x_obj;
+  int swapper;
+} t_swap;
+
+static void swap_float(t_swap *x, t_floatarg f)
+{
+  x->swapper = (f != 0);
+}
+
+static void swap_bang(t_swap *x)
+{
+  x->swapper ^= 1;
+}
+
+static t_int *swap_perform(t_int *w)
+{
+  t_swap	*x = (t_swap *)(w[1]);
+  t_float *in = (t_float *)(w[2]);
+  t_float *out = (t_float *)(w[3]);
+  int n = (int)(w[4]);
+
+
+  if (x->swapper) 
+    while (n--) {
+      short dummy = FLOAT2SHORT * *in++;
+      *out++ = SHORT2FLOAT * (short)( ((dummy & 0xFF) << 8) | ((dummy & 0xFF00) >> 8) );
+    }
+  else while (n--) *out++ = *in++;
+  
+  return (w+5);
+}
+
+static void swap_dsp(t_swap *x, t_signal **sp)
+{
+  dsp_add(swap_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+static void swap_helper(void)
+{
+  post("\n%c swap~-object for byteswapping a signal", HEARTSYMBOL);
+  post("<1/0>  : turn the swapper on/off\n"
+       "'bang' : toggle the swapper on/off\n"
+       "'help' : view this\n"
+       "signal~");
+  post("outlet : signal~");
+}
+
+static void *swap_new(void)
+{
+  t_swap *x = (t_swap *)pd_new(swap_class);
+  outlet_new(&x->x_obj, gensym("signal"));
+  x->swapper = 1;
+  return (x);
+}
+
+void swap_tilde_setup(void)
+{
+  swap_class = class_new(gensym("swap~"), (t_newmethod)swap_new, 0,
+			 sizeof(t_swap), 0, A_NULL);
+  class_addmethod(swap_class, nullfn, gensym("signal"), 0);
+  class_addmethod(swap_class, (t_method)swap_dsp, gensym("dsp"), 0);
+  
+  class_addfloat(swap_class, swap_float);
+  class_addbang(swap_class, swap_bang);
+  
+  class_addmethod(swap_class, (t_method)swap_helper, gensym("help"), 0);
+  class_sethelpsymbol(swap_class, gensym("zexy/swap~"));
+  zexy_register("swap~");
+}
-- 
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