The RAVL IO mechanism includes a way of accessing various system
resources like they were a file, much like devices in /dev under
UN*X. In RAVL all virtual devices start with the @
character. They allow you to access things like frame grabbers and
the display as if it was a file.
Here's some examples:
@X and @XA Used to display images on the screen.
@V4L and @V4LH Access a video 4 linux frame grabber. (From RAVL's Contrib library)
@METEOR1 Access a meteor 1 frame grabber. (From RAVL's Contrib library)
@str Allows a string embedded in a file name to read as if it were the contents of a
file. E.g. if this string is used in place of a "file name":
"@str:... some data ..." then on reading the "file", its "contents" would be:
... some data ...