[Libusb-win32-devel] =?gb2312?B?tPC4tDogW0xpYnVzYi13aW4zMi1kZXZlbF0gRG9lcyBMaWJVU0Igbg==?= =?gb2312?B?b3Qgc3VwcG9ydCBVU0IgQ2FtZXJhIGRldmljZSA/?=

[SinaVIP <da...@vi...>]

 Hi

   My camera use  isochronous transfer protocol.=20

DLL version:	0.1.12.0
Driver version:	0.1.12.0

bus/device  idVendor/idProduct
bus-0/\\.\libusb0-0001--0x0ac8-0x301b     0AC8/301B
- Manufacturer : Vimicro Corp.
- Product      : PC Camera
  wTotalLength:         193
  bNumInterfaces:       1
  bConfigurationValue:  1
  iConfiguration:       0
  bmAttributes:         a0h
  MaxPower:             80
    bInterfaceNumber:   0
    bAlternateSetting:  0
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   0
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  1
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   128
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  2
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   192
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  3
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   256
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  4
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   384
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  5
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   512
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  6
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   768
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
    bInterfaceNumber:   0
    bAlternateSetting:  7
    bNumEndpoints:      2
    bInterfaceClass:    255
    bInterfaceSubClass: 255
    bInterfaceProtocol: 255
    iInterface:         0
      bEndpointAddress: 81h
      bmAttributes:     01h
      wMaxPacketSize:   896
      bInterval:        1
      bRefresh:         0
      bSynchAddress:    0
      bEndpointAddress: 82h
      bmAttributes:     03h
      wMaxPacketSize:   8
      bInterval:        10
      bRefresh:         0
      bSynchAddress:    0
=20

-----=D3=CA=BC=FE=D4=AD=BC=FE-----
=B7=A2=BC=FE=C8=CB: lib...@li...
[mailto:lib...@li...] =B4=FA=B1=ED =
Bertrik
Sikken
=B7=A2=CB=CD=CA=B1=BC=E4: 2006=C4=EA11=D4=C215=C8=D5 1:39
=CA=D5=BC=FE=C8=CB: lib...@li...
=D6=F7=CC=E2: Re: [Libusb-win32-devel] Does LibUSB not support USB =
Camera device ?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

SinaVIP wrote:
> Dear Sir
> =20
>  =20
>     I wanna use LibUSB access USB camera and grab the video data. But=20
> usb_set_configuration function alwayes said "CRC Error" ,Why?
> Does LibUSB not support USB Camera device ?

As far as I know, libusb cannot do isochronous transfers yet (which are =
used
by a lot of webcams). What kind of protocol does your camera use?
Apparently, some of the newer (and expensive) ones use the USB video =
class
standard.

CRC error does not make sense to me in response to a =
usb_set_configuration
call. What argument do you use?
It is in line with the device descriptor?

Kind regards,
Bertrik
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