1 files changed, 66 insertions, 0 deletions
diff --git a/src/spec2_powtodb~.c b/src/spec2_powtodb~.c
new file mode 100644
index 0000000..ebb064e
--- /dev/null
+++ b/src/spec2_powtodb~.c
@@ -0,0 +1,66 @@
+/* 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, Copyright (c) IEM KUG Graz Austria 2000 - 2006 */
+
+#include "m_pd.h"
+#include "iemlib.h"
+#include <math.h>
+
+#define SPEC2LOGTEN 2.302585092994f
+
+/* ------------------------ spec2_powtodb_tilde~ ------------------------- */
+
+static t_class *spec2_powtodb_tilde_class;
+
+typedef struct _spec2_powtodb_tilde
+{
+  t_object  x_obj;
+  t_float   x_msi;
+} t_spec2_powtodb_tilde;
+
+static t_int *spec2_powtodb_tilde_perform(t_int *w)
+{
+  t_float *in = (t_float *)(w[1]);
+  t_float *out = (t_float *)(w[2]);
+  int n = w[3]+1;
+  
+  for(; n--; in++, out++)
+  {
+    t_float f = *in;
+    
+    if(f <= 0.0f)
+      *out = 0.0f;
+    else
+    {
+      t_float g = 100.0f + 10.0f/SPEC2LOGTEN * log(f);
+      *out = (g < 0.0f ? 0.0f : g);
+    }
+  }
+  return(w+4);
+}
+
+static void spec2_powtodb_tilde_dsp(t_spec2_powtodb_tilde *x, t_signal **sp)
+{
+  int n = (sp[0]->s_n)/2;
+  
+  dsp_add(spec2_powtodb_tilde_perform, 3, sp[0]->s_vec, sp[0]->s_vec, n);
+}
+
+static void *spec2_powtodb_tilde_new(void)
+{
+  t_spec2_powtodb_tilde *x = (t_spec2_powtodb_tilde *)pd_new(spec2_powtodb_tilde_class);
+  
+  outlet_new(&x->x_obj, &s_signal);
+  x->x_msi = 0.0f;
+  return (x);
+}
+
+void spec2_powtodb_tilde_setup(void)
+{
+  spec2_powtodb_tilde_class = class_new(gensym("spec2_powtodb~"), (t_newmethod)spec2_powtodb_tilde_new,
+    0, sizeof(t_spec2_powtodb_tilde), 0, 0);
+  CLASS_MAINSIGNALIN(spec2_powtodb_tilde_class, t_spec2_powtodb_tilde, x_msi);
+  class_addmethod(spec2_powtodb_tilde_class, (t_method)spec2_powtodb_tilde_dsp, gensym("dsp"), 0);
+  class_sethelpsymbol(spec2_powtodb_tilde_class, gensym("iemhelp2/spec2_powtodb~-help"));
+}