1 files changed, 107 insertions, 0 deletions
diff --git a/src/spec2_shift~.c b/src/spec2_shift~.c
new file mode 100644
index 0000000..14ccea1
--- /dev/null
+++ b/src/spec2_shift~.c
@@ -0,0 +1,107 @@
+/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+
+iem_spec2 written by Thomas Musil (c) IEM KUG Graz Austria 2002 - 2006 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+
+/* -- spec2_shift~ - shift spectral bins to left (lower, negative) or to right (higher, positiv) --- */
+
+typedef struct spec2_shift_tilde
+{
+  t_object  x_obj;
+  int       x_blocksize;
+  t_float   x_add;
+  t_float   *x_spec;
+  t_float   x_msi;
+} t_spec2_shift_tilde;
+
+t_class *spec2_shift_tilde_class;
+
+static t_int *spec2_shift_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  t_spec2_shift_tilde *x = (t_spec2_shift_tilde *)(w[3]);
+  int i, j, n = (t_int)(w[4])+1;
+  t_float *spec=x->x_spec;
+  t_float add=x->x_add;
+  
+  if((add >= n) || (add <= -n))
+  {
+    for(i=0; i<n; i++)/* clear residal of spec-buffer */
+      out[i] = 0.0f;
+  }
+  else
+  {
+    for(i=0; i<n; i++)/* copy spec into buffer */
+      spec[i] = in[i];
+    
+    if(add >= 0)
+    {
+      for(i=0; i<add; i++)/* clear residal of spec-buffer */
+        out[i] = 0.0f;
+      for(j=0; i<n; i++, j++)/* copy spec into buffer */
+        out[i] = spec[j];
+    }
+    else
+    {
+      add *= -1;
+      for(i=0, j=add; j<n; i++, j++)/* copy spec into buffer */
+        out[i] = spec[j];
+      for(; i<n; i++)/* clear residal of spec-buffer */
+        out[i] = 0.0f;
+    }
+  }
+  return(w+5);
+}
+
+static void spec2_shift_tilde_add(t_spec2_shift_tilde *x, t_floatarg add)
+{
+  x->x_add = add;
+}
+
+static void spec2_shift_tilde_dsp(t_spec2_shift_tilde *x, t_signal **sp)
+{
+  int n = (sp[0]->s_n)/2;
+  
+  if(!x->x_blocksize)
+  {
+    x->x_spec = (t_float *)getbytes((n+1)*sizeof(t_float));
+    x->x_blocksize = n;
+  }
+  else if(x->x_blocksize != n)
+  {
+    x->x_spec = (t_float *)resizebytes(x->x_spec, (x->x_blocksize+1)*sizeof(t_float), (n+1)*sizeof(t_float));
+    x->x_blocksize = n;
+  }
+  dsp_add(spec2_shift_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
+}
+
+static void *spec2_shift_tilde_new(t_floatarg add)
+{
+  t_spec2_shift_tilde *x = (t_spec2_shift_tilde *)pd_new(spec2_shift_tilde_class);
+  
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_blocksize = 0;
+  x->x_add = add;
+  x->x_spec = (t_float *)0;
+  return (x);
+}
+
+static void spec2_shift_tilde_free(t_spec2_shift_tilde *x)
+{
+  if(x->x_spec)
+    freebytes(x->x_spec, (x->x_blocksize+1) * sizeof(t_float));
+}
+
+void spec2_shift_tilde_setup(void)
+{
+  spec2_shift_tilde_class = class_new(gensym("spec2_shift~"), (t_newmethod)spec2_shift_tilde_new,
+    0, sizeof(t_spec2_shift_tilde), 0, A_DEFFLOAT, 0);
+  CLASS_MAINSIGNALIN(spec2_shift_tilde_class, t_spec2_shift_tilde, x_msi);
+  class_addmethod(spec2_shift_tilde_class, (t_method)spec2_shift_tilde_dsp, gensym("dsp"), 0);
+  class_addfloat(spec2_shift_tilde_class, (t_method)spec2_shift_tilde_add);
+  class_sethelpsymbol(spec2_shift_tilde_class, gensym("iemhelp/spec2_shift~-help"));
+}