Hi Laurent, On Wed, 2012-06-27 at 16:42 +0200, Laurent Pinchart wrote: > Hi Ivan, > > On Wednesday 27 June 2012 17:30:32 Ivan T. Ivanov wrote: > > On Wed, 2012-06-27 at 15:54 +0200, Laurent Pinchart wrote: > > > On Wednesday 27 June 2012 16:42:01 Ivan T. Ivanov wrote: > > > > On Tue, 2012-06-26 at 03:30 +0200, Laurent Pinchart wrote: > > > > > On Saturday 23 June 2012 11:22:37 Sakari Ailus wrote: > > > > > > On Mon, Jun 18, 2012 at 04:30:53PM +0200, Laurent Pinchart wrote: > > > > > > > Rearrange the CFA interpolation coefficients table based on the > > > > > > > Bayer pattern. Modifying the table during streaming isn't > > > > > > > supported anymore, but didn't make sense in the first place > > > > > > > anyway. > > > > > > > > > > > > Why not? I could imagine someone might want to change the table > > > > > > while streaming to change the white balance, for example. Gamma > > > > > > tables or the SRGB matrix can be used to do mostly the same but we > > > > > > should leave the decision which one to use to the user space. > > > > > > > > > > Because making the CFA table runtime-configurable brings an additional > > > > > complexity without a use case I'm aware of. The preview engine has > > > > > separate gamma tables, white balance matrices, and RGB-to-RGB and RGB- > > > > > to-YUV matrices that can be modified during streaming. If a user > > > > > really needs to modify the CFA tables during streaming I'll be happy > > > > > to implement that (and even happier to receive a patch :-)), but I'm a > > > > > bit reluctant to add complexity to an already complex code without a > > > > > real use case. > > > > > > > > Sorry for not following this thread very closely. One use case for > > > > changing CFA table is to adjust sharpness of the frames coming out > > > > of the ISP. And we are doing exactly this in N9. > > > > > > Thank you for the valuable feedback. Now we have a use case :-) I'll make > > > sure the CFA table can be updated during streaming then. Are you fine > > > with always specifying the table in SGRBG order, and letting the driver > > > rearrange the 4 blocks based on the input bayer pattern ? > > > > I am afraid that I am not :-). Primary and secondary cameras of the above > > device have different order of the color channels. We are selecting desired > > CFA table pattern based on sensor used. Probably we can add yet another > > IOCTL to previewer sub-device, which will explicitly overwrite "order" of > > the user supplied table? > > The idea is that applications should supply a CFA table in the SGRBG order, > regardless of the real sensor pattern. The ISP driver will then rearrange the > table based on the pattern of the select sensor. I like this idea. > > This will break compatibility with libomap3camd, but the N9 isn't supported by > Nokia anymore anyway :-/ Same feelings :-/. In this case, I suppose you are free to change it as you like it. > BTW, are the CFA tables hardcoded in the libomap3camd > binary, or are they loaded from an external file ? No comments :-) Regards, Ivan -- 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
