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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 IR_KEY_HPP_
+# define IR_KEY_HPP_
+
+# include <string>
+
+using namespace std;
+
+// this structure is aimed at identifying
+// a requested impulse response set
+// that will be use as it
+
+typedef struct s_ir_key
+{
+  // TODO
+  // * add ITD computation method!!
+  // * add resampling options
+
+  // tells if we want a minphase/allpass decomposition
+  // having this options set to true implies more computations
+  // and a better hrtf interpolation
+  bool		minp_ap_dec;
+  // tells whether we want to use the impulse response
+  // in the frequency domain or in the time domain
+  bool		spectral;
+  // the length of the considered impulse response
+  size_t	length;
+  // the path to the directory storing the set of impulse responses
+  string	path;
+  // the regex that should match the name of valid IR files
+  // contains 2 groups corresponding to the azimuth and elevation
+  // composing the sound file name
+  string	iir_regex;
+  // set to true if the azimuth is in the first group of iir_regex
+  // false if the elevation is first
+  bool		is_azimuth_first;
+  // set to true in the db is indexed in vertical-polar coordinates
+  // set to false if the db is indexed in interaural-polar_coordinates
+  bool		vertical_polar_coords;
+
+  // constructor init the structure fields to default values
+  s_ir_key(): minp_ap_dec(false),
+	      spectral(false),
+	      length(0),
+	      path(""),
+	      iir_regex(""),
+	      is_azimuth_first(true),
+	      vertical_polar_coords(true) {}
+} ir_key;
+
+
+// The impulse response key comparison function
+// returns true if its first argument is less than its second argument,
+// and false otherwise
+// it is necessary to index ir_key into sorted containers (map, etc...)
+class ir_key_isless
+{
+public:
+  bool operator() (const ir_key& a, const ir_key& b);
+};
+
+
+#endif