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diff --git a/src/itdcont.hpp b/src/itdcont.hpp
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+++ b/src/itdcont.hpp
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+/*
+    cw_binaural~: a binaural synthesis external for pure data
+    by David Doukhan - david.doukhan@gmail.com - http://www.limsi.fr/Individu/doukhan
+    and Anne Sedes - sedes.anne@gmail.com
+    Copyright (C) 2009-2011  David Doukhan and Anne Sedes
+
+    For more details, see CW_binaural~, a binaural synthesis external for Pure Data
+    David Doukhan and Anne Sedes, PDCON09
+
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+
+#ifndef ITDCONT_HPP_
+# define ITDCONT_HPP_
+
+# include <map>
+
+# include "ir_key.hpp"
+# include "interpolation_candidates.hpp"
+
+class ItdCont
+{
+public:
+  ItdCont(const ir_key& k);
+  // a positive return value means the right signal is late
+  // a negative return value means the left signal is late
+  float	itd_from_candidates(const interp_cdts& ic);
+
+  // to remove
+  inline map<float,map<float,float> >& map_get() {return _m;}
+protected:
+  float	cross_correlation_itd(const float *lsig, const float *rsig, size_t len_sig);
+  float	cross_correlation(const float* s1, const float* s2, size_t len_sig, int n);
+
+  map<float,map<float,float> >	_m;
+};
+
+#endif