/* flags 为缓存当前状态(常见值有 V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE,分别代表当前缓存已经 映射、缓存可以采集数据、缓存可以提取数据) */ enum v4l2_field field; struct timeval timestamp; struct v4l2_timecode timecode; __u32 sequence; /* memory location */ enu...