Hello Stuvart, On Thursday 19 Jan 2017 09:43:16 Stuvart S wrote: > On Thu, Jan 19, 2017 at 2:44 PM Laurent Pinchart wrote: > > On Thursday 19 Jan 2017 08:24:38 Stuvart S wrote: > >> Hi Laurent and all, > >> > >> I would like to ask a very basic question here .. I have an Rcar E2 > >> board with me..Linux 4.8 version kernel is running perfectly on this > >> board.. Now I am getting videos on HDMI output.. I would like to modify > >> this video by tapping from du unit and rescale that video .. I found > >> that many du output source code are there in driver/gpu/drm/rcar-du ..I > >> dont know which of these that I have to edit.. Am I able to take video/ > >> image data from du? I am a newbi in this field .. > > > > The DU doesn't have any scaler, you will need to use an external scaler, > > such as the one included in the VSP (using OpenGL for scaling is also an > > option if you have support for the GPU). No kernel modification is needed > > for this, the DU and VSP are both supported in mainline with a DRM/KMS and > > V4L2 driver respectively. > > Thank you so much . I understand.. But here I am trying to ask about data > tapping from DU .. I cant see any data flow through DU source code ..which > area that I have to focus to do so.. Normally many DU outputs are there > like lvds,hdmi etc.. Here I would like to try to take the data at just > before output port Do you mean capturing the frames to memory ? The DU supports write-back, but there's no software support for it on R-Car Gen2 at the moment. > I dont know wether it is a meaningless question .. -- Regards, Laurent Pinchart
