Extract black and white image from android camera's NV21 format

Question

I have done some google-ing around and couldn\'t find enough information about this format. It is the default format for camera preview. Can anyone suggest good sources of i

Answer 1

NV21 is basically YUV420 but instead of planar format where Y, U and V have independent planes, NV21 has 1 plane for Luma and 2nd plane for Chroma. The format looks like

YYYYYYYYYYYYYYYYYYYYYYYYYYYYY YYYYYYYYYYYYYYYYYYYYYYYYYYYYY . . . .

VUVUVUVUVUVUVUVUVUVUVUVUVUVUVU VUVUVUVUVUVUVUVUVUVUVUVUVUVUVU . . . . .