1 files changed, 77 insertions, 0 deletions
diff --git a/flib/src/sc~.c b/flib/src/sc~.c
new file mode 100644
index 0000000..47c69f5
--- /dev/null
+++ b/flib/src/sc~.c
@@ -0,0 +1,77 @@
+/* flib - PD library for feature extraction 
+Copyright (C) 2005  Jamie Bullock
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+
+
+/* calculates the spectral sc of one frame, given peak frequency and amplitude to first and second inputs respectively */
+
+#include "flib.h"
+
+static t_class *sc_class;
+
+typedef struct _sc {
+  t_object  x_obj;
+  t_float f, x;
+} t_sc;
+
+static t_int *sc_perform(t_int *w)
+{
+  t_sample *in1 = (t_sample *)(w[1]);
+  t_sample *in2 = (t_sample *)(w[2]);
+  t_sc *x = (t_sc *)(w[3]);
+  t_int N = (t_int)(w[4]),M = N >> 1,n;
+  t_float FA = 0,A = 0,C;
+  for (n = 0; n < M; n++){
+	  if (in2[n] != 0){
+		  FA += in1[n] * in2[n];
+		  A += in2[n];
+	  }
+  }
+  C = FA / A;
+  outlet_float(x->x_obj.ob_outlet, C);
+  return (w+5);
+}
+
+static void sc_dsp(t_sc *x, t_signal **sp)
+{
+  dsp_add(sc_perform, 4,
+          sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
+}
+
+static void *sc_new(void)
+{
+  t_sc *x = (t_sc *)pd_new(sc_class);
+ 
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_float);
+  return (void *)x;
+}
+
+
+void sc_tilde_setup(void) {
+  sc_class = class_new(gensym("sc~"),
+        (t_newmethod)sc_new,
+        0, sizeof(t_sc),
+        CLASS_DEFAULT, 
+        A_DEFFLOAT, 0);
+
+  class_addmethod(sc_class,
+        (t_method)sc_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(sc_class, t_sc,f);
+  class_sethelpsymbol(sc_class, gensym("help-flib"));
+}