Add "greyworld" AWB option for input_raspicam

[markus-k]

This pull-request updates the mmal library for the raspicam and adds the "greyworld" AWB option for use with the NoIR camera.

[kbowman-newedenconsultinggroup]

Installed and working perfectly. Thanks for doing this pull!

[jantman]

Any hope of getting this merged?

Confirmed that this fixes it for me as well. Before and after photos with my NoIR camera can be seen at https://github.com/jantman/OctoPi/releases/tag/greyworld-v1

[jacksonliam]

Thanks for this and sorry for the delay, I usually comment on PRs as I see them come in but have missed a few.

This obviously makes a big change to the mmal libraries copied into this repo, the problem I have with updating them is making sure things still work for people running e.g. old versions of raspbian (or at least fail with suitable messages).

I have some old Pis on old images for this testing purpose but when I test on them and things don't work it can be a long process to try and figure out why. For that reason I haven't merged anything which changes the mmal stuff for a while. The old Pis have also been packed away in boxes since March because I needed the office space to make a suitable day-job office. Once

I have the office sorted I will try to get the mmal stuff sorted and up to date ASAP, and look to make sure we can pass-through as many options as possible.

[GhostlyCrowd]

Sure would be nice to have this merged.......

[jantman]

Just checking back on this again. I've been running off of a fork for a year and a half just because of this one feature :(

[Nexpyro]

up running jantman fork too only for this