答:在驱动程序中抽象出来一个结构体v4l2_ctrl, 每个Ctrl对应其中的一项(音量、亮度等等); 由v4l2_ctrl_handler来管理他们 1.初始化 v4l2_ctrl_handler_init 2.设置 v4l2_ctrl_new_std v4l2_ctrl_new_custom 这些函数就是创建各个属性,并且放入v4l2_ctrl_handler的链表 3.跟vdev关联 dev->v4l2_dev.ctrl_handle...
v4l2_ctrl_new_std v4l2_ctrl_new_custom 这些函数就是创建各个属性,并且放入v4l2_ctrl_handler的链表 3.跟vdev关联 dev->v4l2_dev.ctrl_handler = hdl; 1staticint__init vivi_create_instance(intinst)2{3structvivi_dev *dev;4structvideo_device *vfd;5structv4l2_ctrl_handler *hdl;//定义v4l2_ctrl_h...
驱动程序: v4l2_ctrl : 属性。 v4l2_ctrl_handler : 管理 ===>(1)初始化:v4l2_ctrl_handler_init (2)设置:v4l2_ctrl_new_std , v4l2_ctrl_new_custom ,设置创建v4l2_ctrl并加入链表。 (3)跟vdev关联: v4l2_dev.ctrl_handler = hdl video_dev -> v4l2_dev....
&vivi_ctrl_int32,NULL);dev->int64=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_int64,NULL);dev->boolean=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_boolean,NULL);dev->menu=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_menu,NULL);dev->string=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_string,NULL...
dev.name),14"%s-%03d", VIVI_MODULE_NAME, inst);15ret = v4l2_device_register(NULL, &dev->v4l2_dev);16if (ret)17goto free_dev;18//摄像头相关属性设置 19 dev->fmt = &formats[0];20 dev->width = 640;21 dev->height = 480;22 hdl = &dev->ctrl_handler;
-c, --set-ctrl=<ctrl>=<val>[,<ctrl>=<val>...] set the value of the controls [VIDIOC_S_EXT_CTRLS] -D, --info show driver info [VIDIOC_QUERYCAP] -d, --device=<dev> use device <dev> instead of /dev/video0 if <dev> starts with a digit, then /dev/video<dev> is used ...
问在设置V4L2处理程序后添加自定义V4L2控件ENV4L2英文全称是Video for Linux2，它是专门为视频设备设计的...
* based on the requested type and registers the new device node with * the kernel.* * This function assumes that struct video_device was zeroed when it * was allocated and does not contain any stale date.* * An error is returned if no free minor or device node number c...
ctrl->val); else brightness = __intensity_to_led_brightness(ctrl, ctrl->val); /* * In case a LED Flash class driver provides ops for custom * brightness <-> intensity conversion, it also must have defined * related v4l2 control step == 1. In such a case a backward conversion ...
张倩敏 ，刘 拥，吴其林，刘 运 （巢湖学院 信息工程学院，安徽 巢湖 ２３８０００）摘 要：Ｖ４Ｌ２框架新添加了一种Ｒｅｑｕｅｓｔａｐｉ新架构，让视频在编解码时的每一张输入图像可以携带不同的参数，有效提升ｓｔａｔｅｌｅｓｓｃｏｄｅｃｓ、ＣｏｍｐｌｅｘＣａｍｅｒａ、ＣｏｄｅｃＶ２等复杂应用场景的...