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1
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/* shflip.c */
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2
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#include <stdio.h>
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3
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#include <string.h>
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4
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#include <sys/types.h>
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#include <linux/types.h>
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#include <sys/ioctl.h>
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#include <linux/videodev2.h>
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8
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#include <fcntl.h>
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#include <errno.h>
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10
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11
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main(int argc, char *argv[])
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{
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int fd = open("/dev/video0", O_RDWR);
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int ret;
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struct v4l2_queryctrl queryctrl;
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struct v4l2_control ctrl;
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18
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memset(&queryctrl, 0, sizeof(queryctrl));
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for (queryctrl.id = V4L2_CID_BASE;
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queryctrl.id < V4L2_CID_LASTP1;
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queryctrl.id++) {
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if (0 == ioctl (fd, VIDIOC_QUERYCTRL, &queryctrl)) {
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if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)
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continue;
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printf ("Control %s\n", queryctrl.name);
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28
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} else {
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if (errno == EINVAL)
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continue;
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32
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perror ("VIDIOC_QUERYCTRL");
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return (1);
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35
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}
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36
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}
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37
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memset(&ctrl, 0, sizeof(ctrl));
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39
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ctrl.id = V4L2_CID_HFLIP;
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40
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ret = ioctl(fd, VIDIOC_G_CTRL, &ctrl);
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printf("Get H flip, ret %d value %d\n", ret, ctrl.value);
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42
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if (argc > 1) {
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ctrl.value = atoi(argv[1]);
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ret = ioctl(fd, VIDIOC_S_CTRL, &ctrl);
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printf("Set to %d, ret %d\n", ctrl.value, ret);
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46
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}
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}
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48
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