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diff --git a/pd_rhythm_ioi_histogram.h b/pd_rhythm_ioi_histogram.h
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+/* Rhythm estimation in real time -- PD wrapper
+   Copyright (C) 2000 Jarno Seppänen and Piotr Majdak
+   $Id: pd_rhythm_ioi_histogram.h,v 1.1 2002-11-19 11:39:55 ggeiger Exp $
+
+   This file is part of rhythm_estimator.
+
+   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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
+
+#ifndef __PD_RHYTHM_IOI_HISTOGRAM_H__
+#define __PD_RHYTHM_IOI_HISTOGRAM_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#ifndef MAXPDSTRING /* how primitive */
+#include "m_pd.h"
+#endif /* MAXPDSTRING */
+
+#include "rhythm_ioi_histogram.h"
+
+    /* Parameter strings for setting using set-method */
+#define RHYTHM_IOI_HISTOGRAM_HIST_HALF_LIFE_STR "half_life"
+#define RHYTHM_IOI_HISTOGRAM_HIST_CYCLES_STR "cycles"
+
+typedef struct
+{
+    t_object	x_obj;
+
+    Rhythm_Ioi_Histogram*	rhythm_ioi_histogram;
+
+    /* Array-related variables */
+    t_symbol*	array_symbol;
+    unsigned array_nsampsintab;
+    float*	array_vec;
+
+} pd_t_rhythm_ioi_histogram;
+
+/* Object construction and destruction */
+void		rhythm_ioi_histogram_setup (void);
+static void*	pd_rhythm_ioi_histogram_new (t_symbol* s);
+static void	pd_rhythm_ioi_histogram_free (pd_t_rhythm_ioi_histogram* x);
+
+/* "Bang" inlet message callback */
+static void	pd_rhythm_ioi_histogram_bang (pd_t_rhythm_ioi_histogram* x);
+/* Float inlet message callback */
+static void	pd_rhythm_ioi_histogram_float (pd_t_rhythm_ioi_histogram* x, t_floatarg f);
+/* Set-Message interpreter */
+static void	pd_rhythm_ioi_histogram_set (pd_t_rhythm_ioi_histogram* x,
+					     t_symbol* s,
+					     t_float value);
+    /* print method */
+static void	pd_rhythm_ioi_histogram_print (pd_t_rhythm_ioi_histogram* x);
+
+    /* helper functions */
+    /* access to time */
+static	double pd_rhythm_ioi_histogram_get_time (void);
+
+    /* access to an array for displaying the histogram */
+static void	pd_rhythm_ioi_histogram_array_initialize (pd_t_rhythm_ioi_histogram* x,
+						   t_symbol* s);
+static void	pd_rhythm_ioi_histogram_array_write (pd_t_rhythm_ioi_histogram* x,
+					      float* vector,
+					      unsigned length);
+static void	pd_rhythm_ioi_histogram_array_finish (pd_t_rhythm_ioi_histogram* x);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __PD_RHYTHM_IOI_HISTOGRAM_H__ */
+/* EOF */
+