A 32-bit value representing a handle used to identify an open instance of a logical camera unit on a device
#include <camera/camera_api.h>
typedef int32_t camera_handle_t;
A handle to the camera is created by calling the camera_open() function and is released by calling the camera_close() function. A handle, when available, is similar to a file descriptor used to access the camera. Various Camera library calls use the handle to interact with the camera.