Re: [Basic Glib Questions/Help] Unable to create GSource

[John K Luebs <jkluebs luebsphoto com>]

On Tue, Dec 23, 2003 at 02:49:20PM -0800, ZHOU DX wrote:
> > GLib contains various sources that you can look at
> > the source of ...
> > timeouts, idles, IO watches.
> A question about IO watches. 
>
> I am developing a Linux USB2 camera driver.
>  My Gtk app opens it simply by:
> camera_fd=open("/dev/video1").
>
> Is that possible to watch this "camera_fd" in the Gtk
> main loop just like what we usually do on socket or
> file?  (Say, I want to register a callback that is
> called after camera data is ready.)
> What kind of interface the camera driver should
> provide  to support that?

The "standard" interface for video capture devices in Linux is V4L2.
A driver can support mmap, read (potentially zero-copy), and poll.
You should look here for further information: http://bytesex.org/v4l/

--jkl