USB UVC Camera DEBUG

最新推荐文章于 2023-12-05 22:10:07 发布

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#interface #class #linux #stream #audio #image

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本文介绍如何在Linux 2.6.32环境下使Logitech QuickCam正常工作，该设备采用特定供应商协议而非标准USB Video Class(UVC)。文章详细记录了针对zc3xx芯片的驱动开发过程及遇到的问题。

OS :Linux2.6.32
Camera Chip:QuickCam Image

Background:
1)Linux Kernel Support zc3xx chip with QuickCam Image sensor support,I need to make it work under Linux USB UVC(USB Video Class) Framework
2)From lsusb -v that We know Logitech QuickCam Camera use Vendor Specific protocol,So when usb_register driver,we need to let USB core to know that Our Device protocol interface,so we implemented it to make it work with probing
in /usr/src/linux/drivers/media/video/uvc/uvc_driver.c

1969         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
1970                                 | USB_DEVICE_ID_MATCH_INT_INFO,
1971           .idVendor             = 0x046d,
1972           .idProduct            = 0x08a7,
1973           .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
1974           .bInterfaceSubClass   = USB_CLASS_VENDOR_SPEC,
1975           .bInterfaceProtocol   = USB_CLASS_VENDOR_SPEC },

3)error "can not find a valid chain",

Summary:
This Web camera is not UVC compliant Camera,just support Mic,have audio stream interface support,short of VideoStreamInterface Support