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/*
* OMAP3 image quality tuning
*
* Copyright (C) 2010-2012 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* 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.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "isp/omap3isp.h"
#include "isp/stats.h"
#include "isp/tools.h"
#include "iq.h"
struct iq_tuning {
struct omap3_isp_device *isp;
unsigned int frame_count;
unsigned int pix_max;
float mean_level;
unsigned int exposure;
unsigned int exposure_min;
unsigned int exposure_max;
unsigned int gain;
unsigned int gain_min;
unsigned int gain_max;
unsigned int black_level;
};
void iq_aewb_process(struct iq_tuning *iq,
const struct omap3_isp_aewb_stats *stats)
{
unsigned int i;
float gains[4];
double factor;
double gain;
double mean;
/* Automatic White Balance */
mean = stats->accum[0] + stats->accum[3]
+ (stats->accum[1] + stats->accum[2]) / 2;
mean /= 3;
for (i = 0; i < 4; ++i)
gains[i] = mean / stats->accum[i];
omap3_isp_preview_set_white_balance(iq->isp, gains);
/* Automatic Exposure */
if ((iq->frame_count++ % 2) == 0)
return;
mean = stats->accum[0] + stats->accum[1]
+ stats->accum[2] + stats->accum[3];
mean /= 4 * stats->npix;
factor = (iq->pix_max * iq->mean_level) / mean;
gain = factor * iq->exposure * iq->gain / iq->gain_min;
iq->exposure = clamp((unsigned int)gain,
iq->exposure_min, iq->exposure_max);
gain = gain / iq->exposure * iq->gain_min;
iq->gain = clamp((unsigned int)gain,
iq->gain_min, iq->gain_max);
printf("AE: factor %.4f exposure %u sensor gain %u\n",
factor, iq->exposure, iq->gain);
omap3_isp_sensor_set_exposure(iq->isp, iq->exposure);
omap3_isp_sensor_set_gain(iq->isp, iq->gain);
}
struct iq_tuning *iq_init(struct omap3_isp_device *isp)
{
struct v4l2_mbus_framefmt format;
struct v4l2_rect window;
struct iq_tuning *iq;
iq = malloc(sizeof *iq);
if (iq == NULL)
return NULL;
iq->isp = isp;
iq->frame_count = 0;
iq->pix_max = (1 << 10) - 1;
iq->mean_level = 0.15;
iq->exposure = 1000;
iq->exposure_min = 10;
iq->exposure_max = 2000;
iq->gain = 8;
iq->gain_min = 8;
iq->gain_max = 1024;
iq->black_level = 64;
omap3_isp_sensor_set_gain(isp, iq->gain);
omap3_isp_sensor_set_exposure(isp, iq->exposure);
omap3_isp_ccdc_set_black_level(isp, iq->black_level);
omap3_isp_stats_get_format(isp, &format);
window.left = 0;
window.top = 0;
window.width = format.width;
window.height = format.height;
omap3_isp_aewb_configure(isp, &window, iq->pix_max - iq->black_level - 1);
omap3_isp_stats_enable(isp, true);
return iq;
}
void iq_cleanup(struct iq_tuning *iq)
{
free(iq);
}
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