1 files changed, 71 insertions, 0 deletions
diff --git a/flib/src/ss~.c b/flib/src/ss~.c
new file mode 100644
index 0000000..8ad1caa
--- /dev/null
+++ b/flib/src/ss~.c
@@ -0,0 +1,71 @@
+/* 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 smoothness of one frame according to Krimphoff et al. 1994*/
+
+#include "flib.h"
+static t_class *ss_class;
+
+typedef struct _ss {
+  t_object  x_obj;
+  t_float f,x;
+} t_ss;
+
+static t_int *ss_perform(t_int *w)
+{
+  t_sample *in = (t_sample *)(w[1]);
+  t_ss *x = (t_ss *)(w[2]);
+  t_int N = (t_int)(w[3]),M = N >> 1,n;
+  t_float I = 0, buf[M];
+  for(n = 0; n < M; buf[n++] = *in++);
+  for(n = 2; n < M - 1; n++){
+	  if(buf[n] != 0 && buf[n-1] != 0 && buf[n+1] != 0)
+		  I += (buf[n] - (buf[n-1] + buf[n] + buf[n+1]) / 3);
+  }
+
+  outlet_float(x->x_obj.ob_outlet, I);
+  return (w+4);
+}
+
+static void ss_dsp(t_ss *x, t_signal **sp)
+{
+  dsp_add(ss_perform, 3,
+          sp[0]->s_vec, x, sp[0]->s_n);
+}
+
+static void *ss_new(void)
+{
+  t_ss *x = (t_ss *)pd_new(ss_class);
+  outlet_new(&x->x_obj, &s_float);
+  return (void *)x;
+}
+
+
+void ss_tilde_setup(void) {
+  ss_class = class_new(gensym("ss~"),
+        (t_newmethod)ss_new,
+        0, sizeof(t_ss),
+        CLASS_DEFAULT,0);
+
+  class_addmethod(ss_class,
+        (t_method)ss_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(ss_class, t_ss,f);
+  class_sethelpsymbol(ss_class, gensym("help-flib"));
+}