If  using same frame work , allocate 8M 16bit will using  16M memory
and It is physically DMA memory. It to hard for linux system.

I think  Andorid Camera hardware interface give a good interface for
it .
it can use Jpeg callback to transfer the JPEG data not the raw
data.

/frameworks/base/include/ui/CameraHardwareInterface.h
    virtual status_t    takePicture(shutter_callback,
                                    raw_callback,
                                    jpeg_callback,
                                    void* user) = 0;


It suitable for using the smart camera sensor !
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