UVC摄像头驱动怎么识别一帧图像数据？

通过UVC的负载数据头（payload header informatiion）来实现的。
如我们通过BUSHOUND进行抓包：

  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  2f fa b1 0a 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  69 c8 92 51 
  30.3  IN     0c 0e 00 00  00 00 00 00  00 00 00 00  ed e7 3e 2c 
  30    IN                                                        
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  ae 0c 8e 63 
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  63 68 78 d0 
  30.3  IN     0c 0f 00 00  00 00 00 00  00 00 00 00  d0 93 b5 aa 
  30    IN                                                        
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  df ac 8a 22 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  55 e3 23 cc 
  30.3  IN     0c 0e 00 00  00 00 00 00  00 00 00 00  3c f8 30 f4

可以看到，负载数据头为12字节，其bmHeaderInfo的bit1为1时（可选），代表一个完整的帧传输完成，而BIT0从0变成1或者从1变成0时，代表一个新帧的开始。所以以上数据的格式帧应该这样划化：

//第一帧
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  2f fa b1 0a 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  69 c8 92 51 
  30.3  IN     0c 0e 00 00  00 00 00 00  00 00 00 00  ed e7 3e 2c 


//第2帧
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  ae 0c 8e 63 
  30.3  IN     0c 0d 00 00  00 00 00 00  00 00 00 00  63 68 78 d0 
  30.3  IN     0c 0f 00 00  00 00 00 00  00 00 00 00  d0 93 b5 aa 

//第3帧
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  00 00 00 01 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  df ac 8a 22 
  30.3  IN     0c 0c 00 00  00 00 00 00  00 00 00 00  55 e3 23 cc 
  30.3  IN     0c 0e 00 00  00 00 00 00  00 00 00 00  3c f8 30 f4

更细节的内容分析可见：http://www.usbzh.com/article/detail-7.html