Thomas Petazzoni (thomas.petazzoni@xxxxxxxx) wrote: > Hello, > > Christophe Lucas wrote: > > >Use V4L2. > >Perhaps this pointers could help you : > > http://www.mail-archive.com/linux-usb@xxxxxxxx/msg02026.html (very > > old) > > http://www.ussg.iu.edu/hypermail/linux/kernel/0408.3/2684.html > > http://v4l2spec.bytesex.org/spec/format.html#AEN656 > > Apparently, V4L2 allows user-space programs to «negotiate» the format of > the frames to be exchanged. I understand that this is useful to > negotiate whether you want a RGB image or YUV image or whatever, but how > can this help in decompressing a specific frame format ? I mean, the > userspace program negotiate with the pwc driver. The pwc kernel driver > can only capture compressed frames. Who will make the decompression ? > The userspace program itself ? > > (Of course, I may have completely misunderstood the possibilities of > V4L2. Don't hesitate to tell me if I did). I can give you one example: programs based on sn9c102 driver. userspace programs negociate between Bayer image or sn9c kind of picture. And decompression is made in userspace. Some projects like : http://sn-webcam.sourceforge.net http://stolk.org/sonic-snap/ Have a nice day, ~Christophe PS: I think this thread begin to be HS. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
