digital_rf_deprecated_hdf5.py 文件源码

def _get_new_rows(self, rf_file_basename):
        """_get_new_rows is a private method that returns all needed rows for self.metadata in the correct recarray
        format for rf_file_basename, or None if that file has disappeared

        Inputs:
            rf_file_basename - rf file to examine

        Throws IOError if global indices overlap with previous metadata
        """
        # read data from /rf_data_index
        fullname = os.path.join(self.top_level_dir, self.channel_name, self.subdirectory, rf_file_basename)
        try:
            f = h5py.File(fullname, 'r')
        except IOError:
            # presumably file deleted
            return(None)
        rf_data_index = f['/rf_data_index']
        samples_per_file = f['rf_data'].attrs['samples_per_file'][0]
        if self.samples_per_file is None:
            self.samples_per_file = int(samples_per_file)
        elif self.samples_per_file != int(samples_per_file):
            raise IOError, 'Illegal change in samples_per_file from %i to %i in file %s' % (self.samples_per_file, int(samples_per_file),
                                                                                            fullname)

        # create recarray
        new_rows = numpy.zeros((len(rf_data_index),),dtype=self.data_t)
        new_rows['unix_sample_index'] = rf_data_index[:,0]
        new_rows['file_index'] = rf_data_index[:,1]
        new_rows['rf_basename'] = rf_file_basename

        f.close()

        return(new_rows)