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-rw-r--r--src/z~.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/src/z~.c b/src/z~.c
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+/******************************************************
+ *
+ * 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
+ *
+ ******************************************************/
+
+/*
+ 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"
+
+/* ----------------------------------------------------- */
+
+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_tilde_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~"));
+ zexy_register("z~");
+}