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Ignore event_offset in cnt when no events exist. #4520

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Sep 6, 2017
Merged

Ignore event_offset in cnt when no events exist. #4520

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26 changes: 16 additions & 10 deletions mne/io/cnt/cnt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -183,7 +183,10 @@ def _get_cnt_info(input_fname, eog, ecg, emg, misc, data_format, date_format):
cnt_info['continuous_seconds'] = np.fromfile(fid, dtype='<f4',
count=1)[0]

data_size = event_offset - (900 + 75 * n_channels)
if event_offset < data_offset: # no events
data_size = n_samples * n_channels
else:
data_size = event_offset - (data_offset + 75 * n_channels)
if data_format == 'auto':
if (n_samples == 0 or
data_size // (n_samples * n_channels) not in [2, 4]):
Expand Down Expand Up @@ -228,17 +231,20 @@ def _get_cnt_info(input_fname, eog, ecg, emg, misc, data_format, date_format):
cal = np.fromfile(fid, dtype='f4', count=1)
cals.append(cal * sensitivity * 1e-6 / 204.8)

fid.seek(event_offset)
event_type = np.fromfile(fid, dtype='<i1', count=1)[0]
event_size = np.fromfile(fid, dtype='<i4', count=1)[0]
if event_type == 1:
event_bytes = 8
elif event_type in (2, 3):
event_bytes = 19
if event_offset > data_offset:
fid.seek(event_offset)
event_type = np.fromfile(fid, dtype='<i1', count=1)[0]
event_size = np.fromfile(fid, dtype='<i4', count=1)[0]
if event_type == 1:
event_bytes = 8
elif event_type in (2, 3):
event_bytes = 19
else:
raise IOError('Unexpected event size.')
n_events = event_size // event_bytes
else:
raise IOError('Unexpected event size.')
n_events = 0

n_events = event_size // event_bytes
stim_channel = np.zeros(n_samples) # Construct stim channel
for i in range(n_events):
fid.seek(event_offset + 9 + i * event_bytes)
Expand Down