Re: programming the usb cam

On 6 4 , 10 00 , Lew Pitcher <lpitc...@xxxxxxxxxxxx> wrote:
On Jun 4, 2:24 am, cmk...@xxxxxxxxxxx wrote:

Hi
I have a logitech video cam, i want to programming it to capture
the screen back. Where i can download the protocol?

Sorry, Peter, but it is unclear to me what you want to do with your
webcam.

The way I read your post, it sounds like you want to set up your
webcam so that it views your screen, and you subsequently want to
capture this view. Is this correct?

To do this, you want us to tell you where you can "download the
protocol" from so that you can "program it [the webcam]". Is this
correct?

If this last is correct, then
a) you don't "download the protocol" any more than you "read an idea".
A protocol is an abstract thing, a description of how two somethings
work together. There's nothing concrete to download. You /could/
download a description of the protocol, though. From the first part of
your query, it sounds like you want to know the "on the wire" protocol
used by your webcam. Why? Why not just use the APIs (v4l or v4l2) that
give you access to the data, and let /them/ handle the protocol?
b) typically, you don't "program the webcam". Webcams are mostly dumb
devices, and any program would reside on your linux system instead.
Why do you want to program your webcam? Why not write a linux program
to access the webcam? For that matter, why not use one of the many v4l/
v4l2 applications already available for Linux to access your webcam?
Or is that what you are asking about?

Please clarify
--
Lew

Hi Lew
Yes, i want to write a program to control the webcam directly. But
i don't think logitech or other web cam manufacturer will provide you
a sdk. So no API is available. I am planning to build my linux robot
running on an arm development board.
I nearly have nothing on my embedded linux, not much library. so i
want to control the cam directly, that why i ask for a communication
protocol/API.

thanks
from Peter (cmk128@xxxxxxxxxxx)

.

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