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TdtRawIO: detect SEV vs TEV using the UCF flag instead of silent per-channel fallback #1835

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TdtRawIO: detect SEV vs TEV using the UCF flag instead of silent per-channel fallback #1835

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687f42c
fix tdt
h-mayorquin Apr 20, 2026
9323263
Merge branch 'master' into fix_tdt
h-mayorquin Apr 21, 2026
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16 changes: 15 additions & 1 deletion neo/rawio/tdtrawio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -214,6 +214,13 @@ def _parse_header(self):
buffer_id = ""
signal_streams.append((stream_name, stream_id, buffer_id))

# The UCF ("use compact format") bit in the TankEvType flags indicates that the
# store was configured at recording time to write per-channel SEV files rather
# than embedding stream data in the shared TEV file. When this bit is set, the
# TEV file does not contain valid stream data for this store, so any missing
# SEV file must be surfaced as an error rather than silently falling back.
store_requires_sev = bool(info["TankEvType"] & EVTYPE_UCF)

for channel_index in range(info["NumChan"]):
global_chan_index = len(signal_channels)
chan_id = channel_index + 1
Expand Down Expand Up @@ -305,13 +312,20 @@ def _parse_header(self):

# in case non or multiple sev files are found for current stream + channel
if len(sev_filename) != 1:
missing_sev_channels.append(chan_id)
if not store_requires_sev:
missing_sev_channels.append(chan_id)
sev_filename = None
else:
sev_filename = sev_filename[0]

if (sev_filename is not None) and sev_filename.exists():
data = np.memmap(sev_filename, mode="r", offset=0, dtype="uint8")
elif store_requires_sev:
raise NeoReadWriteError(
f"Store '{stream_name}' was recorded in SEV (discrete files) mode but no SEV "
f"file was found for channel {chan_id} in segment '{segment_name}'. "
f"TEV does not contain valid stream data for this store, so there is no fallback."
)
else:
data = self._tev_datas[seg_index]
if data is None:
Expand Down
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