v4l2_ctrl_new_std_menu(&foo->ctrl_handler,&foo_ctrl_ops,V4L2_CID_POWER_LINE_FREQUENCY,V4L2_CID_POWER_LINE_FREQUENCY_60HZ,0,V4L2_CID_POWER_LINE_FREQUENCY_DISABLED); ...if(foo->ctrl_handler.error){int err=foo->ctr
struct v4l2_ctrl_handler {// 互斥锁,用于控制对该处理程序及其控件的访问struct mutex _lock;// 指向互斥锁的指针struct mutex *lock;// 控件列表struct list_head ctrls;// 控件引用列表struct list_head ctrl_refs;// 上次找到的控件引用,因为同一个控件可能需要多次使用,所以这是一个简单的优化struct v4l2...
unsignedintnotification,void*arg);structv4l2_ctrl_handler*ctrl_handler;structv4l2_prio_stateprio;structkrefref;void(*release)(structv4l2_device *v4l2_dev);
_CONTRAST, 0, 255, 1, 16); v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_SATURATION, 0, 255, 1, 127); v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_HUE, -128, 127, 1, 0); if (hdl->error) { ret = hdl->error; goto free_hdl; } skel->v4l2_dev.ctrl_handler =...
(struct v4l2_subdev*sd,unsigned int notification,void*arg);/* The control handler. May be NULL. */struct v4l2_ctrl_handler*ctrl_handler;/* Device's priority state */struct v4l2_prio_state prio;/* BKL replacement mutex. Temporary solution only. */struct mutex ioctl_lock;/* Keep track of...
struct v4l2_ctrl_handler *ctrl_handler; //控制处理数据结构 struct v4l2_prio_state prio; //优先级状态 struct kref ref; //计数 void (*release)(struct v4l2_device *v4l2_dev); //释放v4l2设备函数指针 }; 1. 2. 3. 4. 5. 6. 7. ...
struct v4l2_ctrl_handler*ctrl_handler;//设备优先级状态 struct v4l2_prio_state prio;/*BKL replacement mutex.Temporary solution only.*/struct mutex ioctl_lock;//struct v4l2_device结构体的引用计数,等于0时才释放 struct kref ref;//引用计数ref为0时,调用release函数进行释放资源和清理工作 ...
**K8S关键词:v4l2_ctrl_handler_init** ## 介绍 在Kubernetes(K8S)中,v4l2_ctrl_handler_init 是一个用于初始化控制器处理程序的函数。这个函数通常被用于视频设备的驱动程序中,用于初始化控制器的结构体,并设置相关参数。 ## 实现步骤 在实现 v4l2_ctrl_handler_init 这一函数时,我们需要按照以下步骤进行操作。
modprobe: ERROR: could not insert 'v4l2loopback': Unknown symbol in module, or unknown parameter (see dmesg) 如果检查dmesg:87243.295525 v4l2loopback: Unknown symbol video_ioctl2 (err -2) 87243.295553 v4l2loopback:未知符号v4l2_ctrl_handler_init_class (err -2) ...
@@ -2290,6 +2290,16 @@ int tegra_channel_init_video(struct tegra_channel *chan) chan->video->ctrl_handler = &chan->ctrl_handler; chan->video->lock = &chan->video_lock; + /* Validate that the name fits */ + if (ARRAY_SIZE(chan->video->name) >= ARRAY_SIZE(chan->devnode_nam...