Messages in this thread | | | Date | Tue, 23 Dec 2008 11:52:46 +0100 | From | Sascha Hauer <> | Subject | Re: [PATCH 2/4 v4] i.MX31: Image Processing Unit DMA and IRQ drivers |
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On Tue, Dec 23, 2008 at 01:09:10PM +0300, Dmitry Krivoschekov wrote: > Robert Schwebel wrote: > > On Mon, Dec 22, 2008 at 07:37:53PM +0100, Sascha Hauer wrote: > >> Another thing is the overlay framebuffer. I think it's mainly useful > >> to display video streams. > > > > Right. The idea is that you can push a video stream into /dev/fb1 (for > > example by using the gstreamer fbdev sink) while displaying widgets from > > a GUI toolkit on /dev/fb0. > > > >> Maybe it's better to implement this as a v4l device as unlike the > >> framebuffer API the v4l API is designed to handle different image > >> buffers. > > > > Huh? v4l is image-frames-to-userspace, not vice versa. > > > ...and vice versa too, v4l2 is not about input devices only but it is > also related to output devices, v4l2 spec even has a special chapter > dedicated to overlays [1]. Moreover, you can find such a driver within > Freescale's BSP [2]. Another example is Omap's videoout driver [3].
Are you aware of any application making use of this feature?
Sascha
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