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-rw-r--r--src/blockswap~.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/blockswap~.c b/src/blockswap~.c
new file mode 100644
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--- /dev/null
+++ b/src/blockswap~.c
@@ -0,0 +1,99 @@
+/******************************************************
+ *
+ * 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
+ *
+ ******************************************************/
+
+#include "zexy.h"
+
+/* ------------------------ blockswap~ ----------------------------- */
+
+/* swaps a signalblock around it's center:
+ {x[0], x[1], ... x[n-1]} --> {x[n-1], x[n-2], ... x[0]}
+*/
+
+static t_class *blockswap_class;
+
+typedef struct _blockswap
+{
+ t_object x_obj;
+ int doit;
+ int blocksize;
+ t_float *blockbuffer;
+} t_blockswap;
+
+static void blockswap_float(t_blockswap *x, t_floatarg f)
+{
+ x->doit = (f != 0);
+}
+
+static t_int *blockswap_perform(t_int *w)
+{
+ t_blockswap *x = (t_blockswap *)(w[1]);
+ t_float *in = (t_float *)(w[2]);
+ t_float *out = (t_float *)(w[3]);
+ int N = (int)(w[4]);
+ int N2=N/2;
+ if (x->doit) {
+ int n=N2;
+ t_float *dummy=x->blockbuffer;
+ while(n--)*dummy++=*in++;
+ n=N-N2;
+ while(n--)*out++=*in++;
+ dummy=x->blockbuffer;
+ n=N2;
+ while(n--)*out++=*dummy++;
+ } else while (N--) *out++=*in++;
+ return (w+5);
+}
+
+static void blockswap_dsp(t_blockswap *x, t_signal **sp)
+{
+ if (x->blocksize*2<sp[0]->s_n){
+ if(x->blockbuffer)freebytes(x->blockbuffer, sizeof(t_float)*x->blocksize);
+ x->blocksize = sp[0]->s_n/2;
+ x->blockbuffer = getbytes(sizeof(t_float)*x->blocksize);
+ }
+ dsp_add(blockswap_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+static void blockswap_helper(void)
+{
+ post("\n%c blockswap~-object for blockwise-swapping of a signal ", HEARTSYMBOL);
+ post("'help' : view this\n"
+ "signal~");
+ post("outlet : signal~");
+}
+
+static void *blockswap_new(void)
+{
+ t_blockswap *x = (t_blockswap *)pd_new(blockswap_class);
+ outlet_new(&x->x_obj, gensym("signal"));
+ x->doit = 1;
+ x->blocksize=0;
+ return (x);
+}
+
+void blockswap_tilde_setup(void)
+{
+ blockswap_class = class_new(gensym("blockswap~"), (t_newmethod)blockswap_new, 0,
+ sizeof(t_blockswap), 0, A_NULL);
+ class_addmethod(blockswap_class, nullfn, gensym("signal"), 0);
+ class_addmethod(blockswap_class, (t_method)blockswap_dsp, gensym("dsp"), 0);
+
+ class_addfloat(blockswap_class, blockswap_float);
+
+ class_addmethod(blockswap_class, (t_method)blockswap_helper, gensym("help"), 0);
+ class_sethelpsymbol(blockswap_class, gensym("zexy/blockswap~"));
+ zexy_register("blockswap~");
+}