cdef class Detection:
    cdef public double x, y, w, h, confidence
    cdef public str annotation_name
    cdef public int cls

    cdef public overlaps(self, Detection det2)

cdef class Annotation:
    cdef public str name
    cdef public str original_media_name
    cdef long time
    cdef public list[Detection] detections
    cdef public bytes image

    cdef format_time(self, ms)
    cdef bytes serialize(self)