blackrockio.py 文件源码

def __read_nev_data(self, nev_data_masks, nev_data_types):
        """
        Extract nev data from a 2.1 or 2.2 .nev file
        """
        filename = '.'.join([self._filenames['nev'], 'nev'])
        data_size = self.__nev_basic_header['bytes_in_data_packets']
        header_size = self.__nev_basic_header['bytes_in_headers']

        # read all raw data packets and markers
        dt0 = [
            ('timestamp', 'uint32'),
            ('packet_id', 'uint16'),
            ('value', 'S{0}'.format(data_size - 6))]

        raw_data = np.memmap(filename, offset=header_size, dtype=dt0)

        masks = self.__nev_data_masks(raw_data['packet_id'])
        types = self.__nev_data_types(data_size)

        data = {}
        for k, v in nev_data_masks.items():
            data[k] = raw_data.view(types[k][nev_data_types[k]])[masks[k][v]]

        return data