1 files changed, 77 insertions, 0 deletions
diff --git a/flib/src/pspec~.c b/flib/src/pspec~.c
new file mode 100644
index 0000000..80512c5
--- /dev/null
+++ b/flib/src/pspec~.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.
+*/
+
+
+
+/* Compute the phase (in radians) spectrum of a signal given the real and imaginary components of an fft */
+
+#include "flib.h"
+#define SQ(a) (a * a)
+
+static t_class *pspec_class;
+
+typedef struct _pspec {
+  t_object  x_obj;
+  t_float f;
+} t_pspec;
+
+static t_int *pspec_perform(t_int *w)
+{
+  t_sample *in1 = (t_sample *)(w[1]);
+  t_sample *in2 = (t_sample *)(w[2]);
+  t_sample *out = (t_sample *)(w[3]);
+  t_int N = (t_int)(w[4]),n;
+  t_float piv2 = M_PI * .5;
+  for (n = 0; n < N; n++){
+	  if(in1[n] == 0 && in2[n] == 0 || in1[n] == 0)
+		  *out++ = 0;
+	  else if(in2[n] == 0) 
+		  *out++ = piv2;
+	  else
+	  *out++ = atanf(in1[n] / in2[n]);
+  }
+  return (w+5);
+}
+
+static void pspec_dsp(t_pspec *x, t_signal **sp)
+{
+  dsp_add(pspec_perform, 4,
+          sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
+}
+
+static void *pspec_new(void)
+{
+  t_pspec *x = (t_pspec *)pd_new(pspec_class);
+ 
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
+  outlet_new(&x->x_obj, &s_signal);
+  return (void *)x;
+}
+
+
+void pspec_tilde_setup(void) {
+  pspec_class = class_new(gensym("pspec~"),
+        (t_newmethod)pspec_new,
+        0, sizeof(t_pspec),
+        CLASS_DEFAULT, 0);
+
+  class_addmethod(pspec_class,
+        (t_method)pspec_dsp, gensym("dsp"), 0);
+  CLASS_MAINSIGNALIN(pspec_class, t_pspec,f);
+  class_sethelpsymbol(pspec_class, gensym("help-flib"));
+}