Linux V4L2框架源码分析

最新推荐文章于 2025-07-06 14:34:23 发布

Wind-flow

最新推荐文章于 2025-07-06 14:34:23 发布

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分类专栏： Linux 文章标签： v4l2

本文链接：https://blog.youkuaiyun.com/lphappiness/article/details/78829020

#V4L2 video_device 分析

##目录

文章目录

- #V4L2 video_device 分析
- video_device 结构体

video_device 结构体

struct video_device 结构体是用来生成和管理V4L2 device节点的。video_device结构体如下：

struct video_device
{
#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_entity entity;
	struct media_intf_devnode *intf_devnode;
	struct media_pipeline pipe;
#endif
	const struct v4l2_file_operations *fops;

	u32 device_caps;     //device capabilities as used in v4l2_capabilities

	/* sysfs */
	struct device dev;     //struct device for the video device
	struct cdev *cdev;

	struct v4l2_device *v4l2_dev;    //pointer to &struct v4l2_device parent
	struct device *dev_parent;
	
	struct v4l2_ctrl_handler *ctrl_handler;

	struct vb2_queue *queue;    //vb2_queue associated with this device node

	struct v4l2_prio_state *prio;   //with device's Priority state

	/* device info */
	char name[32];
	int vfl_type;         //V4L device type
	int v