On Sun July 7 2013 23:50:30 Sylwester Nawrocki wrote: > Hi Hans, > > On 06/28/2013 02:27 PM, Hans Verkuil wrote: > > This patch series adds support for matrices and motion detection and > > converts the solo6x10 driver to use these new APIs. > > > > See the RFCv2 for details on the motion detection API: > > > > http://www.mail-archive.com/linux-media@xxxxxxxxxxxxxxx/msg62085.html > > > > And this RFC for details on the matrix API (which superseeds the v4l2_md_blocks > > in the RFC above): > > > > http://permalink.gmane.org/gmane.linux.drivers.video-input-infrastructure/65195 > > > > I have tested this with the solo card, both global motion detection and > > regional motion detection, and it works well. > > > > There is no documentation for the new APIs yet (other than the RFCs). I would > > like to know what others think of this proposal before I start work on the > > DocBook documentation. > > These 3 ioctls look pretty generic and will likely allow us to handle wide > range of functionalities, similarly to what the controls framework does > today. > > What I don't like in the current trend of the V4L2 API development > though is > that we have seemingly separate APIs for configuring integers, rectangles, > matrices, etc. And interactions between those APIs sometimes happen to be > not well defined. > > I'm not opposed to having this matrix API, but I would _much_ more like to > see it as a starting point of a more powerful API, that would allow to > model > dependencies between parameters being configured and the objects more > explicitly and freely (e.g. case of the per buffer controls), that would > allow to pass a list of commands to the hardware for atomic > re-configurations, > that would allow to create hardware configuration contexts, etc., etc. > > But it's all song of future, requires lots of effort, founding and takes > engineers with significant experience. > > As it likely won't happen soon I guess we can proceed with the matrix API > for now. Do you attend the LPC in New Orleans? I would like to discuss this further, but it is easier to do so face-to-face with a whiteboard. Alternatively, we could set up a brainstorm session somewhere. This discussion keeps cropping up time and again, perhaps we should start to do something about it :-) Regards, Hans -- 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
