On 09:39 Sat 29 Sep 2007, Michel Xhaard wrote: > Le Vendredi 28 Septembre 2007 20:01, Greg KH a ?crit?: > > On Fri, Sep 28, 2007 at 07:38:17PM +0200, Hans de Goede wrote: > > > Greg KH wrote: > > >> On Fri, Sep 28, 2007 at 02:13:37PM +0200, Bertrik Sikken wrote: > > >>> Many webcam drivers are consequently maintained out of the > > >>> official kernel and *DO* include decompression and bayer > > >>> conversion to at least get webcams into a workable state. > > >>> (Examples, there are many more: > > >>> * Philips PWC driver: http://www.saillard.org/linux/pwc/ > > >>> * Various other drivers: http://www.linux-projects.org > > >>> * Spca driver: http://mxhaard.free.fr/spca5xx.html ) > > >>> > > >>> Some ideas: > > >>> * create a user-space library for webcams that reads the compressed > > >>> data from a v4l(2) device file, decompresses and unbayers it, > > >>> then exposes it through a standard API to applications. > > >>> * as above, instead of library, use gstreamer plug-ins (each compressed > > >>> webcam format would have its own plugin, with perhaps a single plugin > > >>> for unbayering). > > >>> * bypass the kernel drivers entirely and use libusb to talk to the > > >>> webcams. A problem is that (AFAIK) libusb does not support > > >>> isochronous USB transfers and many cameras use this transfer mode. > > >>> > > >>> Any thoughts on how to improve Linux webcam support? > > >> > > >> Yes, work with the existing Linux video driver developers. They need > > >> all the help they can get. > > >> More information about them can be found at http://linuxtv.org > > >> That being said, I have no objection to people helping on this project > > >> to take some of the current out-of-tree drivers and cleaning them up to > > >> get them included in the main kernel source tree. That would be an > > >> immense help that the people here could provide. > > >> Does anyone want to pick up one of the above mentioned drivers, or any > > >> of the other ones floating around on the net, and do this? > > > > > > Actually I've been toying with the idea to work on the UVC webcam driver > > > to make it suitable for upstream / mainstream kernel merging. I haven't > > > contacted the UVC developers about this yet, as I've been swamped with > > > other stuff. > > > > There is already a developer, Brandon (on the CC:) who is actively > > working on this. You might want to work with him, if he needs any help. > > His response might be delayed as he is traveling this weekend across > > the globe... > > Is Brandon working with the Linux UVC team ? You should forward to the > uvcvideo mailing list !! Yes, I will once I have working patches :) I took a quick detour to fix up the vivi driver against the latest videobuf code. http://linuxtv.org/hg/~mchehab/videobuf/ The two things that need to be done to get UVC in are moving to videobuf instead of using uvc_queue.c and moving the ioctls to video_ioctl2. Cheers, Brandon
