what is v4L2
一个图补充华清远见（ 背景： 从是在 linux 内核中关于视频设备的子系统，涉及视频设备的操作控制。从 2.5.x 版本的内核开始，其改进版本 V4L2 （ Video4Linux2 ， VideoforLinux Two ）就被集成到内核里面去了，修复了 V4L 设计的部分 bug 。 V4L2 设计 的
一个图 补充华清远见（
背景：
从 是在li nux内核中关于视频设备的子系统，涉及视频设备的操作控制。从
2.5.x版本的内核开始，其改进版本V4L2（Video4Linux2 ，Video for Linux
Two ）就被集成到内核里面去了，修复了V4L 设计的部分bug。V4L2设计
的目的是要支持更多的设备其中只有一部分在本质上是真正的视频设备 的目的是要支持更多的设备，其中只有一部分在本质上是真正的视频设备
。V4L2提供有如下几种接口：
} A 、视频采集接口(video capture interface)
驱动高频头或者摄像头 } 驱动高频头或者摄像头
} B、视频输出接口(video output interface)
} 驱动计算机外围视频图像设备，如可以输出电视信号格式的设备
} C、直接传输视频接口(video overlay interface)//现在使用的，在huawei
} 驱动把采集的信号直接输出到输出设备的视频采集设备，而不经过CPU
} D 、视频间隔消隐信号接口(VBI interface)
} 应用于可以访问传输消隐期的视频信号
} E、收音机接口(radio interface)
} 驱动处理音频流的AM或FM高频头设备
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