/*
 *		Ugly hack made for AlguaBeep
 *
 *		+++++++++++++++++++++++++++++++++++++++++
 *		+   DO   NOT   USE   IN   REAL   LIFE   +
 *		+++++++++++++++++++++++++++++++++++++++++
 */
#include  <stdio.h>
#include  <stdlib.h>
#include  <unistd.h>
#include  <errno.h>
#include <sys/ioctl.h>

#include  <string.h>

#include <linux/videodev2.h>
#include <libv4l2.h>

#include  "controls.h"

extern int verbosity;

int set_controls(int fd, int brightness, int contrast)
{
struct v4l2_queryctrl queryctrl;
struct v4l2_control control;

memset (&queryctrl, 0, sizeof (queryctrl));
queryctrl.id = V4L2_CID_BRIGHTNESS;

if (-1 == ioctl (fd, VIDIOC_QUERYCTRL, &queryctrl)) {
	if (errno != EINVAL) {
		perror ("VIDIOC_QUERYCTRL");
		exit (EXIT_FAILURE);
	} else {
		fprintf (stderr, "V4L2_CID_BRIGHTNESS is not supported\n");
	}
} else if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
	fprintf (stderr, "V4L2_CID_BRIGHTNESS is not supported\n");
} else {
	memset (&control, 0, sizeof (control));
	control.id = V4L2_CID_BRIGHTNESS;
	control.value = queryctrl.default_value;

	if (-1 == ioctl (fd, VIDIOC_S_CTRL, &control)) {
		perror ("VIDIOC_S_CTRL");
		exit (EXIT_FAILURE);
	}
}

memset (&control, 0, sizeof (control));
control.id = V4L2_CID_CONTRAST;

if (0 == ioctl (fd, VIDIOC_G_CTRL, &control)) {
	control.value += 1;

	/* The driver may clamp the value or return ERANGE, ignored here */

	if (-1 == ioctl (fd, VIDIOC_S_CTRL, &control)
	    && errno != ERANGE) {
		perror ("VIDIOC_S_CTRL");
		exit (EXIT_FAILURE);
	}
/* Ignore if V4L2_CID_CONTRAST is unsupported */
} else if (errno != EINVAL) {
	perror ("VIDIOC_G_CTRL");
	exit (EXIT_FAILURE);
}

control.id = V4L2_CID_AUDIO_MUTE;
control.value = 1; /* silence */

/* Errors ignored */
ioctl (fd, VIDIOC_S_CTRL, &control);

return 0;
}