Hi Thomas On Thu, 1 Sep 2011, Thomas Petazzoni wrote: > Hello Josh, > > I am currently looking at V4L2 and your atmel-isi driver for an AT91 > based platform on which I would like the ISI interface to capture the > image from a camera and have this image directly output in RGB format > at a specific location on the screen (so that it can be nicely > integrated into a Qt application for example). Isn't this what V4L2_CAP_VIDEO_OVERLAY type drivers are doing? I've never dealt with those, but it seems to be exactly what you need. ATM there are no soc-camera drivers, implementing this capability, so, looks like implementing this in atmel-isi won't be a very boring task for you;-) Thanks Guennadi > > At the moment, I grab frames from the V4L2 device to userspace, do the > YUV -> RGB conversion manually in my application, and then displays the > converted frame on the framebuffer thanks to normal Qt painting > mechanisms. This works, but obviously consumes a lot of CPU. > > >From the AT91 datasheet, I understand that the ISI interface is capable > of doing the YUV -> RGB conversion and is also capable of outputting > the frame at some location in the framebuffer, but I don't see how to > use this capability with the Linux V4L2 and framebuffer infrastructures. > > Is this possible ? If so, could you provide some pointers or starting > points to get me started ? If not, what is missing in the driver ? > > Thanks a lot, > > Thomas > -- > Thomas Petazzoni, Free Electrons > Kernel, drivers, real-time and embedded Linux > development, consulting, training and support. > http://free-electrons.com > -- > 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 > --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- 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
