UVC_HEADER_DESCRIPTOR 描述符

include/uapi/linux/usb/video.h:210:#define DECLARE_UVC_HEADER_DESCRIPTOR(n) \
struct UVC_HEADER_DESCRIPTOR (n){
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u16 bcdUVC;
__u16 wTotalLength;
__u32 dwClockFrequency;
__u8 bInCollection;
__u8 baInterfaceNr[n];
} attribute ((packed))