Add avfoundation support for normal OSX build, not just iOS (Bug #4187)

Added by Dustin Spicuzza about 10 years ago. Updated over 9 years ago.

Status:	New	Start date:	2015-02-10
Priority:	Normal	Due date:
Assignee:	Vadim Pisarevsky	% Done:	0%
Category:	highgui-video
Target version:	3.0
Affected version:	branch 'master' (3.0-dev)	Operating System:	Mac OSX
Difficulty:	Easy	HW Platform:	x64
Pull request:

Description

When using QTKit, things like exposure settings and such aren't supported. AVFoundation supports doing this, however.

I hacked with the makefiles in a very minimal way, and I found the following:

Can't enable QTKit and AVFoundation at the same time, otherwise link errors occur
Have to add some frameworks in CMakeLists.txt in videoio -- here's what my line that worked was (not sure if there's too many frameworks there, I just copy/pasted settings from IOS):

list(APPEND VIDEOIO_LIBRARIES "-framework Accelerate" "-framework AVFoundation" "-framework CoreGraphics" "-framework CoreMedia" "-framework CoreVideo" )

Once I did this very minimal change, I compiled and was able to set the exposure on the webcam using PROP_IOS_DEVICE_EXPOSURE on my Macbook Pro. I haven't done extensive testing yet, but my understanding is that AVFoundation is mostly identical on iOS and OSX.