Hi Mauro, On Thursday 25 August 2011 14:43:56 Mauro Carvalho Chehab wrote: > Em 24-08-2011 19:29, Sakari Ailus escreveu: [snip] > > The question I still have on this is that how should the user know which > > video node to access on an embedded system with a camera: the OMAP 3 ISP, > > for example, contains some eight video nodes which have different ISP > > blocks connected to them. Likely two of these nodes are useful for a > > general purpose application based on which image format it requests. It > > would make sense to provide generic applications information only on > > those devices they may meaningfully use. > > IMO, we should create a namespace device mapping for video devices. What I > mean is that we should keep the "raw" V4L2 devices as: > /dev/video?? > But also recommend the creation of a new userspace map, like: > /dev/webcam?? > /dev/tv?? > ... > with is an alias for the actual device. > > Something similar to dvd/cdrom aliases that already happen on most distros: > > lrwxrwxrwx 1 root root 3 Ago 24 12:14 cdrom -> sr0 > lrwxrwxrwx 1 root root 3 Ago 24 12:14 cdrw -> sr0 > lrwxrwxrwx 1 root root 3 Ago 24 12:14 dvd -> sr0 > lrwxrwxrwx 1 root root 3 Ago 24 12:14 dvdrw -> sr0 I've been toying with a similar idea. libv4l currently wraps /dev/video* device nodes and assumes a 1:1 relationship between a video device node and a video device. Should this assumption be somehow removed, replaced by a video device concept that wouldn't be tied to a single video device node ? -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
