u012420933的专栏

一般操作流程（视频设备）： 1. 打开设备文件。 int fd=open("/dev/video0",O_RDWR); 2. 取得设备的capability，看看设备具有什么功能，比如是否具有视频输入,或者音频输入输出等。VIDIOC_QUERYCAP,struct v4l2_capability 3. 选择视频输入，一个视频设备可以有多个视频输入。VIDIOC_S_INPUT,struct

Profiles The standard includes the following seven sets of capabilities, which are referred to as profiles, targeting specific classes of applications: Baseline Profile (BP): Primarily for lowe