On Thu, 18 Jun 2009, Andy Walls wrote:
My daughter just got one of these toy digital video recorder & webcam
unit.
It normally shows up as a mass storage drive.
If I hold down the shutter button while connecting the USB cable, the
camera LCD show a "webcam mode" icon and it shows up as a different USB
device.
Any chance of this working as a webcam under linux?
Regards,
Andy
lsusb -vvv output:
Mass storage mode:
Bus 003 Device 003: ID 0979:0371 Jeilin Technology Corp., Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0979 Jeilin Technology Corp., Ltd
idProduct 0x0371
bcdDevice 1.00
iManufacturer 1 Jeilin
iProduct 2 USB 1.1 Device
iSerial 3 09790
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 4 SMC CF SD
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
Webcam mode:
Bus 003 Device 005: ID 0979:0280 Jeilin Technology Corp., Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0979 Jeilin Technology Corp., Ltd
idProduct 0x0280
bcdDevice 1.00
iManufacturer 1 Jeilin
iProduct 2 USB 1.1 Device
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 0 (Defined at Interface level)
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 4 SMC CF SD
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
Interesting. To answer your question, I have no idea off the top of my
head. I do have what seems to be a similar camera. It is
Bus 005 Device 006: ID 0979:0371 Jeilin Technology Corp., Ltd
and the rest of the lsusb output looks quite similar. I do not know,
though, if it has any chance of working as a webcam. Somehow, the thought
never occurred to me back when I got the thing. I would have to hunt some
stuff down even to know if it is claimed to work as a webcam.
You did say that it comes up as a different USB device when it is a
webcam? You mean, a different product ID or so?
Some history about my camera, which will perhaps make you smile:
I got it a couple of years ago, at about the same time that someone in
Germany got a similar camera, and he wanted to get it supported. He wanted
to stick it on a model airplane, IIRC, and take pictures. Well, it says it
is a mass storage device. But it wouldn't work with the mass storage
driver. So I got on the mass-storage mailing list about the camera. Alan
Stern was the one who figured out first what was the problem. I was right
behind him, and it made me feel stupid that I was slower than he was. But
you do have to be mighty good to keep up with Alan, so I really don't feel
bad. What was the problem? Well, notice that there are two pairs of bulk
endpoints. The camera uses one pair for data, and the other pair for
commands. But which pair? Well, the mass storage driver at the time was
choosing the wrong pair. And it was the camera which was in spec, not the
mass storage stack. Needless to say, that got fixed, pronto. And all
because of one of these pesky cameras.
Another general comment about Jeilin is probably not relevant here,
but I will make it anyway:
Some of their cameras (the 0979:0227 cameras) use a really nasty
compression algorithm. These are also dual-mode still and web cams. There
is no hope of supporting them unless the compression is figured out. I
hope some clever guy reads this comment.
Probably what is happening with your camera is, it is using something like
JPEG in stillcam mode? If so, it might possibly send down JPEG frames in
webcam mode, too. Perhaps with the use of SnoopyPro or such, it is
possible to find out?
Theodore Kilgore
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