Generate a (marker_code, segment_offset) 2-tuple for each marker in
        the JPEG *stream*, in the order they occur in the stream.

def iter_markers(self):
        """
        Generate a (marker_code, segment_offset) 2-tuple for each marker in
        the JPEG *stream*, in the order they occur in the stream.
        """
        marker_finder = _MarkerFinder.from_stream(self._stream)
        start = 0
        marker_code = None
        while marker_code != JPEG_MARKER_CODE.EOI:
            marker_code, segment_offset = marker_finder.next(start)
            marker = _MarkerFactory(
                marker_code, self._stream, segment_offset
            )
            yield marker
            start = segment_offset + marker.segment_length