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src/mathutils.c: add window type 'ones'

--- a/src/mathutils.c

+++ b/src/mathutils.c

@@ -28,6 +28,7 @@

 /** Window types */

 typedef enum

 {

+  aubio_win_ones,

   aubio_win_rectangle,

   aubio_win_hamming,

   aubio_win_hanning,

@@ -63,7 +64,9 @@

   if (window_type == NULL) {

       AUBIO_ERR ("window type can not be null.\n");

       return 1;

-  } else if (strcmp (window_type, "rectangle") == 0)

+  } else if (strcmp (window_type, "ones") == 0)

+      wintype = aubio_win_ones;

+  else if (strcmp (window_type, "rectangle") == 0)

       wintype = aubio_win_rectangle;

   else if (strcmp (window_type, "hamming") == 0)

       wintype = aubio_win_hamming;

@@ -88,9 +91,11 @@

       return 1;

   }

   switch(wintype) {

+    case aubio_win_ones:

+      fvec_ones(win);

+      break;

     case aubio_win_rectangle:

-      for (i=0;i<size;i++)

-        w[i] = 0.5;

+      fvec_set_all(win, .5);

       break;

     case aubio_win_hamming:

       for (i=0;i<size;i++)