How to use V4L or V4L2 (Video for Linux) in Android?

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Does Android Linux Kernel support V4L or V4L2 (Video for Linux). If not, is it possible to add it?

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Yes,Android support V4L2,Android camera subsystem internally uses V4L2.
For more reference pls check http://comments.gmane.org/gmane.comp.handhelds.android.porting/12285

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On newer devices it's actually used ( Samsung Note 3 or S4 GT-I9506 ) to play videos, handle the camera and so on.