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diff --git a/src/lingot-audio.h b/src/lingot-audio.h
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+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2011  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_AUDIO_H__
+#define __LINGOT_AUDIO_H__
+
+#ifdef ALSA
+#include <alsa/asoundlib.h>
+#endif
+
+#ifdef JACK
+#include <jack/jack.h>
+#endif
+
+#include "lingot-config.h"
+
+typedef void (*LingotAudioProcessCallback)(FLT* read_buffer,
+		int read_buffer_size, void *arg);
+
+typedef struct _LingotAudioHandler LingotAudioHandler;
+
+struct _LingotAudioHandler {
+
+	int audio_system;
+	char device[100];
+
+	LingotAudioProcessCallback process_callback;
+	void* process_callback_arg;
+
+#ifdef ALSA
+	snd_pcm_t *capture_handle;
+#endif
+
+	int dsp; // file handler.
+	int read_buffer_size;
+	SAMPLE_TYPE* read_buffer;
+	FLT* flt_read_buffer;
+
+#	ifdef JACK
+	jack_port_t *jack_input_port;
+	jack_client_t *jack_client;
+	int nframes;
+#	endif
+
+	//	char error_message[100];
+	unsigned int real_sample_rate;
+
+	// pthread-related  member variables
+	pthread_t thread_input_read;
+	pthread_attr_t thread_input_read_attr;
+
+	// indicates whether the audio thread is running
+	int running;
+
+	// indicates whether the thread was interrupted (by the audio server, not
+	// by the user)
+	int interrupted;
+};
+
+typedef struct _LingotAudioSystemProperties LingotAudioSystemProperties;
+
+struct _LingotAudioSystemProperties {
+
+	int forced_sample_rate; // tells whether the sample rate can be changed
+
+	int n_sample_rates; // number of available sample rates
+	int* sample_rates; // sample rates
+
+	int n_devices; // number of available devices
+	char** devices; // devices
+};
+
+LingotAudioSystemProperties* lingot_audio_get_audio_system_properties(
+		audio_system_t audio_system);
+void lingot_audio_audio_system_properties_destroy(LingotAudioSystemProperties*);
+
+// creates an audio handler
+LingotAudioHandler
+		*
+		lingot_audio_new(audio_system_t audio_system, char* device,
+				int sample_rate, LingotAudioProcessCallback process_callback,
+				void *process_callback_arg);
+
+// destroys an audio handler
+void lingot_audio_destroy(LingotAudioHandler*);
+
+int lingot_audio_start(LingotAudioHandler*);
+void lingot_audio_stop(LingotAudioHandler*);
+
+#endif