Re: Sakar 57379 USB Digital Video Camera...

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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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