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diff --git a/src/lingot-core.h b/src/lingot-core.h
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+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot 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.
+ *
+ * lingot 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 lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_CORE_H__
+#define __LINGOT_CORE_H__
+
+#include <pthread.h>
+
+#include "lingot-defs.h"
+#include "lingot-complex.h"
+#include "lingot-filter.h"
+#include "lingot-config.h"
+
+#ifdef LIB_FFTW
+# include <fftw.h>
+#endif
+
+#ifdef LIBSNDOBJ
+#  include <SndObj/AudioDefs.h>
+#else
+#  include "lingot-audio.h"
+#endif
+
+typedef struct _LingotCore LingotCore;
+
+struct _LingotCore {
+
+	//  -- shared data --
+	FLT freq; // analog frequency calculated.
+	FLT* X; // visual portion of FFT.
+	//  -- shared data --
+
+# ifdef LIBSNDOBJ
+	SndRTIO* audio; // audio handler.
+# else
+	LingotAudio* audio; // audio handler.
+# endif
+
+	SAMPLE_TYPE* read_buffer;
+	FLT* flt_read_buffer;
+	FLT* temporal_buffer; // sample memory.
+
+	// precomputed hamming windows
+	FLT* hamming_window_temporal;
+	FLT* hamming_window_fft;
+
+	// windowed signals
+	FLT* windowed_temporal_buffer;
+	FLT* windowed_fft_buffer;
+
+	// spectral power distribution esteem.
+	FLT* spd_fft;
+	FLT* spd_dft;
+	FLT* diff2_spd_fft;
+
+# ifdef LIB_FFTW
+	fftw_complex* fftw_in;
+	fftw_complex* fftw_out; // complex signals in time and freq.
+	fftw_plan fftwplan;
+# else
+	LingotComplex* fft_out; // complex signal in freq.
+# endif
+
+	LingotFilter* antialiasing_filter; // antialiasing filter for decimation.
+
+	int running;
+
+	LingotConfig* conf; // configuration structure
+
+	// pthread-related  member variables
+	pthread_t thread;
+	pthread_attr_t attr;
+};
+
+//----------------------------------------------------------------
+
+LingotCore* lingot_core_new(LingotConfig*);
+void lingot_core_destroy(LingotCore*);
+
+// start process
+void lingot_core_start(LingotCore*);
+
+// stop process
+void lingot_core_stop(LingotCore*);
+
+// process thread
+void lingot_core_run(LingotCore*);
+
+#endif //__LINGOT_CORE_H__