uvc英文版规范，研究无驱usb摄像头可参考一下 USB_Video_Class_1.1.pdf USB_Video_Example 1.1.pdf USB_Video_FAQ_1.1.pdf USB_Video_Identifiers_1.1.pdf USB_Video_Payload_DV_1.1.pdf USB_Video_Payload_Frame_Based_1.1.pdf USB_Video_Payload_MJPEG_1.1.pdf USB_Video_Payload_MPEG-2_TS_1.1.pdf USB_Video_Payload_Stream_Based_1.1.pdf USB_Video_Payload_Uncompressed_1.1.pdf USB_Video_Transport_1.1.pdf