Retrieve the current camera time
#include <camera/external_camera_api.h>
typedef int64_t(* get_time_func_t)(void *handle);
This function returns the current time value in the camera time domain in microseconds. The time domain used here must be the same one as the one used to fill the timestamp in get_preview_frame_func_t.
This function is optional. If this function isn't specified, the default implementation uses CLOCK_MONOTONIC.
The current sensor time in microseconds.