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fix(decode): recover the exact waveform trigger from the binary (no .TXT)

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Follow-up to the ts1→ts2 fix: get the trigger to the second from the binary
alone, instead of falling back to the stop time (~record-duration late) for
no-report events.

The configured post-trigger record time is a big-endian float32 in the
recording-setup config block, exactly 30 bytes before the "Standard Recording
Setup" marker.  _parse_record_time_seconds reads it; the waveform branch now
stamps trigger = ts2 - record_time.  Verified: the field reads 1.0 / 2.0 / 3.0 s
across different setups in the corpus, and all 7 BE12844 oracle events now
decode to their exact Blastware trigger (N844LQHB 10:33:29) from the binary,
no paired .TXT needed.  Falls back to ts2 (the stop) if the config block is
absent.  A paired report's event_datetime stays authoritative (clock drift).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDXjZCr4RqT2U3QvMDhgzf
This commit is contained in:
serversdown
2026-09-20 22:31:22 +00:00
co-authored by Claude Opus 4.8
parent a84a46e9d4
commit 1e76d08b37
2 changed files with 47 additions and 19 deletions
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tests/test_event_timestamp.py
+11 -10
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@@ -29,11 +29,12 @@ def _tuple(ts):
return (ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second)
def test_waveform_timestamp_is_event_stop_not_session_start():
def test_waveform_timestamp_is_exact_trigger_from_binary():
ev = read_blastware_file(WAVEFORM)
# ts2 (the event's recording stop), NOT the 06:00:13 monitoring-session
# start the old decode used.
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 32), _tuple(ev.timestamp)
# The EXACT Blastware trigger, from the binary alone: ts2 (stop 10:33:32)
# minus the config record time (3.0 s) = 10:33:29 — NOT the 06:00:13
# monitoring-session start the old decode used.
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 29), _tuple(ev.timestamp)
def test_histogram_timestamp_is_window_start_unchanged():
@@ -43,11 +44,11 @@ def test_histogram_timestamp_is_window_start_unchanged():
assert _tuple(ev.timestamp) == (2026, 5, 10, 19, 4, 50), _tuple(ev.timestamp)
def test_report_event_datetime_overrides_to_exact_trigger():
# A paired BW report carries the exact trigger time; applying it must
# override the binary footer's stop time so the event matches BW exactly.
def test_report_event_datetime_is_authoritative_over_binary():
# The binary already yields the exact trigger, but a paired report stays
# authoritative (e.g. if the unit clock had drifted) — applying it wins.
ev = read_blastware_file(WAVEFORM)
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 32) # stop, pre-report
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 29) # exact, from binary
apply_report_to_event(ev, BwAsciiReport(
event_datetime=datetime.datetime(2026, 8, 25, 10, 33, 29)))
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 33, 29) # exact BW trigger
event_datetime=datetime.datetime(2026, 8, 25, 10, 35, 0)))
assert _tuple(ev.timestamp) == (2026, 8, 25, 10, 35, 0) # report wins