v4l2_libs/libv4lconvert/processing/libv4lprocessing-priv.h

/*
#             (C) 2008-2009 Elmar Kleijn <elmar_kleijn@hotmail.com>
#             (C) 2008-2009 Sjoerd Piepenbrink <need4weed@gmail.com>
#             (C) 2008-2009 Hans de Goede <hdegoede@redhat.com>

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License, version 2.1,
# as published by the Free Software Foundation.
#
# 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335  USA
 */

#ifndef __LIBV4LPROCESSING_PRIV_H
#define __LIBV4LPROCESSING_PRIV_H

#include "../control/libv4lcontrol.h"
#include "../libv4lsyscall-priv.h"

#define V4L2PROCESSING_UPDATE_RATE 10

struct v4lprocessing_data {
	struct v4lcontrol_data *control;
	int fd;
	int do_process;
	int controls_changed;
	/* True if any of the lookup tables does not contain
	   linear 0-255 */
	int lookup_table_active;
	/* Counts the number of processed frames until a
	   V4L2PROCESSING_UPDATE_RATE overflow happens */
	int lookup_table_update_counter;
	/* RGB/BGR lookup tables */
	unsigned char comp1[256];
	unsigned char green[256];
	unsigned char comp2[256];
	/* Filter private data for filters which need it */
	/* whitebalance.c data */
	int green_avg;
	int comp1_avg;
	int comp2_avg;
	/* gamma.c data */
	int last_gamma;
	unsigned char gamma_table[256];
	/* autogain.c data */
	int last_gain_correction;
};

struct v4lprocessing_filter {
	/* Returns 1 if the filter is active */
	int (*active)(struct v4lprocessing_data *data);
	/* Returns 1 if any of the lookup tables was changed */
	int (*calculate_lookup_tables)(struct v4lprocessing_data *data,
			unsigned char *buf, const struct v4l2_format *fmt);
};

extern struct v4lprocessing_filter whitebalance_filter;
extern struct v4lprocessing_filter autogain_filter;
extern struct v4lprocessing_filter gamma_filter;

#endif