opencv/modules/androidcamera/camera_wrapper/camera_wrapper.h

enum CameraWrapperErrorCode {
    ERROR_NATIVE_CAMERA_WRAPPER_NOERROR = 0,
    ERROR_NATIVE_CAMERA_WRAPPER_CANNOT_FIND_CLASS = 1,
    ERROR_NATIVE_CAMERA_WRAPPER_CANNOT_FIND_FIELD = 2,
    ERROR_NATIVE_CAMERA_WRAPPER_CANNOT_SET_PREVIEW_DISPLAY = 3
};

typedef bool (*CameraCallback)(void* buffer, size_t bufferSize, void* userData);

typedef void* (*InitCameraConnectC)(void* cameraCallback, int cameraId, void* userData);
typedef void (*CloseCameraConnectC)(void**);
typedef double (*GetCameraPropertyC)(void* camera, int propIdx);
typedef void (*SetCameraPropertyC)(void* camera, int propIdx, double value);
typedef void (*ApplyCameraPropertiesC)(void** camera);

extern "C" 
{
void* initCameraConnectC(void* cameraCallback, int cameraId, void* userData);
void closeCameraConnectC(void**);
double getCameraPropertyC(void* camera, int propIdx);
void setCameraPropertyC(void* camera, int propIdx, double value);
void applyCameraPropertiesC(void** camera);
}