1 files changed, 89 insertions, 0 deletions
diff --git a/src/z_swap.c b/src/z_swap.c
new file mode 100644
index 0000000..60b72c2
--- /dev/null
+++ b/src/z_swap.c
@@ -0,0 +1,89 @@
+/*
+	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"
+#ifdef NT
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+/* ------------------------ 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 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()
+{
+    t_swap *x = (t_swap *)pd_new(swap_class);
+    outlet_new(&x->x_obj, gensym("signal"));
+	x->swapper = 1;
+    return (x);
+}
+
+void z_swap_setup(void)
+{
+    swap_class = class_new(gensym("swap~"), (t_newmethod)swap_new, 0,
+    	sizeof(t_swap), 0, A_DEFFLOAT, 0);
+    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)helper, gensym("help"), 0);
+	class_sethelpsymbol(swap_class, gensym("zexy/swap~"));
+}