From 45dfb5debd4a0d0bc79ad8b6691576e8462d1396 Mon Sep 17 00:00:00 2001
From: David Doukhan <rudk@users.sourceforge.net>
Date: Mon, 7 Feb 2011 13:09:27 +0000
Subject: cw_binaural~ code and examples! Makefile still missing

svn path=/trunk/externals/ddoukhan/cw_binaural~/; revision=14855
---
 src/itdcont.cpp | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/itdcont.cpp

(limited to 'src/itdcont.cpp')

diff --git a/src/itdcont.cpp b/src/itdcont.cpp
new file mode 100644
index 0000000..74a679b
--- /dev/null
+++ b/src/itdcont.cpp
@@ -0,0 +1,92 @@
+/*
+    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/>.
+*/
+
+
+#include "itdcont.hpp"
+#include "flyweight_ir_factory.hpp"
+
+#include "logstring.hpp"
+
+// returns an itd set corresponding to key k
+// assumption: constructor will alwas be called from FlyweightIrFactory
+// and the field spectral set to false in the factory
+ItdCont::ItdCont(const ir_key& k)
+{
+  ir_key	k2 = k;
+  k2.minp_ap_dec = false;
+
+  HrtfCont*	hc = FlyweightIrFactory::instance()->hrtf_set_get(k2);
+  
+  for (angle1_cit ia1 = hc->map_get()->begin(); ia1 != hc->map_get()->end(); ia1++)
+    for (angle2_cit ia2 = ia1->second.begin(); ia2 != ia1->second.end(); ia2++)
+      _m[ia1->first][ia2->first]
+	= cross_correlation_itd(ia2->second.lbuf, ia2->second.rbuf, hc->ir_length_get());
+}
+
+// compute the cross-correlation between signals s1, s2 of size len_sig
+// for n sample time lag
+float	ItdCont::cross_correlation(const float* s1, const float* s2, size_t len_sig, int n)
+{
+  float	res = 0;
+  //  slog << "ARG " << n << endl;
+  for (int i = (n >= 0 ? 0 : -n); i < (n <= 0 ? (int) len_sig : (int) len_sig - n); ++i)
+    res += s1[i] * s2[i+n];
+
+  //  slog << "local cross corr " << n << ":" << res << endl;
+  return res;
+}
+
+// compute an estimation of the ITD using crosscorrelation
+// taking into account the left and right impulse responses
+float	ItdCont::cross_correlation_itd(const float *lsig, const float *rsig, size_t len_sig)
+{
+  int	arg, argmax;
+  float val, valmax;
+  int ilen_sig = (int) len_sig;
+
+  // slog << "lensig " << len_sig << ilen_sig<< endl;
+
+  //slog << lsig << rsig << len_sig << endl;
+  argmax = 1-len_sig;
+  valmax = cross_correlation(lsig, rsig, len_sig, argmax);
+  for (arg = 2 -  ilen_sig; arg < ilen_sig - 1; ++arg)
+    //{
+    //  slog << "FOR ARG " << arg << endl;
+    if ((val = cross_correlation(lsig, rsig, len_sig, arg)) > valmax)
+      {
+	argmax = arg;
+	valmax = val;
+      }
+  //  }
+  // slog << "ARGMAXXXX " << argmax << endl;
+  return argmax;
+}
+
+float	ItdCont::itd_from_candidates(const interp_cdts& ic)
+{
+  float res = _m[ic.angle_index1[0] ][ic.angle_index2[0] ] * ic.weight[0];
+  for (size_t i = 1; i < ic.size; ++i)
+    res += _m[ic.angle_index1[i]][ic.angle_index2[i]] * ic.weight[i];
+  return res;
+}
-- 
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