ahc2src: Introduce a new source for Android Camera 2 NDK API

Submitted by Justin Kim @joykim

Link to original bug (#788696)

Description

Created attachment 361159
ahc2src: new source element for camera2ndk on Android

Since Android Nougat, Android provides Camera 2 NDK APIs so no JNI wrappers are required to implement ahc2src. Therefore, cebero's 'target_distro_version' should be 'DistroVersion.ANDROID_NOUGAT' or greater to build this element.

One outstanding result of this element is the quick response to discarding internal buffers so 763308 will not happen.

Patch 361159, "ahc2src: new source element for camera2ndk on Android":
0001-ahc2src-Add-support-android-camera2ndk.patch