其中enum v4l2_ctrl_type { V4L2_CTRL_TYPE_INTEGER = 1, /* 整形 */ V4L2_CTRL_TYPE_BOOLEAN = 2, /* 真值 */ V4L2_CTRL_TYPE_MENU = 3, /* 菜单 */ V4L2_CTRL_TYPE_BUTTON = 4, /* 无值 */ V4L2_CTRL_TYPE_INTEGER64 = 5, /* 后面三种不常用 */ V4L2_CTRL_TYPE_CTRL_CLASS = 6, ...
enum v4l2_ctrl_type { V4L2_CTRL_TYPE_INTEGER = 1,/* 整形 */ V4L2_CTRL_TYPE_BOOLEAN = 2,/* 真值 */ V4L2_CTRL_TYPE_MENU = 3,/* 菜单 */ V4L2_CTRL_TYPE_BUTTON = 4,/* 无值 */ V4L2_CTRL_TYPE_INTEGER64 = 5,/* 后面三种不常用 */ V4L2_CTRL_TYPE_CTRL_CLASS = 6, V4L2_CTRL_...
这可以是V4L2_CTRL_TYPE_INTEGER、 V4L2_CTRL_TYPE_BOOLEAN、V4L2_CTRL_TYPE_MENU (针对一组固定的择项) 或V4L2_CTRL_TYPE_BUTTON (针对一些设定时会忽略任何给出的值的控制操作).name字段用来描述控制操作;它可以在展现给用户的应用接口中使用。 对于整型的控制来说(仅针对这种控制),minimum和maximum 描述的是控...
|= V4L2_CTRL_FLAG_NEXT_CTRL; } 当然前提是驱动必须提供对 V4L2_CTRL_FLAG_NEXT_CTRL 的支持。 应用程序可以为创建一个控制面板,其中包含一系列控制,每个 control class 用一个 V4L2_CTRL_TYPE_CTRL_CLASS 类型开始,当使用 VIDIOC_QUERYCTRL 的时候将返回这个 control class 的 name ,下面我们来看 camera cont...
int ioctl(int fd, int request, struct v4l2_querymenu *argp); 获得user control ID 以后,可以对其中可以修改的 ID 按照应用程序的要求进行修改 VIDIOC_G_CTRL, VIDIOC_S_CTRL : int ioctl(int fd, int request, struct v4l2_control *argp); ...
static const struct v4l2_ctrl_config vivi_ctrl_int64 = { .ops = &vivi_ctrl_ops, .id = VIVI_CID_CUSTOM_BASE + 3, .name = "Integer 64 Bits", .type = V4L2_CTRL_TYPE_INTEGER64, .step = 1, }; static const char * const vivi_ctrl_menu_strings[] = { ...
V4l2拍照API调⽤详解 v4l2 操作实际上就是 open() 设备， close() 设备，以及中间过程的 ioctl() 操作。对于 ioctl 的调⽤，要注意对 errno 的判断，如果调⽤被其他信号中断，即 errno 等于 EINTR 的时候，要重新调⽤。Video capture device 的实际功能就是采集视频信号，并将数字化的图像保存在 memory ...
void (*copy)(camera_menu_t*, struct v4l2_querymenu*) = &camera_menu_copy; switch (control->type) { case CAMERA_CTRL_MENU: break; #ifndef CAMERA_OLD_VIDEODEV2_H case CAMERA_CTRL_INTEGER_MENU: copy = &camera_integer_menu_copy; ...
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这可以是V4L2_CTRL_TYPE_INTEGER、V4L2_CTRL_TYPE_BOOLEAN、V4L2_CTRL_TYPE_MENU (针对一组固定的择项)或V4L2_CTRL_TYPE_BUTTON(针对一些设定时会忽略任何给出的值的控制操作).name字段用来描述控制操作;它可以在展现给用户的应用接口中使用。对于整型的控制来说(仅针对这种控制),minimum和maximum 描述的是控制所...