Claude
ae0e17b5dc
Three things to make pickup smoother: 1. analysis/README.md (NEW): catalogues the ~25 scratch scripts. Categorizes them as "still useful" / "superseded — keep for archaeology" / "pure exploration". Tells a fresh engineer which files to read first and which to ignore. 2. scratch/next_experiment_skeleton.py (NEW): stub + spec for the segment-channel scoring analyzer. Includes the fixture loader, block walker, and decode-segment-as-channel helper — just enough scaffolding that the next pass starts from "fill in score_segment_against_all_channels()" rather than from scratch. Already runs and confirms 13 segments per 3-sec event with sample starts going to 6590 (way past the 3328 actual samples) — strong evidence that not all segments carry Tran. 3. Removed decode-re/ duplicate. It was a mirror of tests/fixtures/. Analysis scripts that hardcoded decode-re/ paths updated to point at tests/fixtures/. CLAUDE.md note updated: future event uploads go directly into a dated subdirectory under tests/fixtures/. All 40 tests still pass. Skeleton runs.
82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
"""Decode Tran across multiple segments by resetting at 40 02 headers."""
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import sys
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sys.path.insert(0, ".")
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from analysis.load_bundle import _parse_txt
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from minimateplus.waveform_codec import walk_body, find_data_start
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def s4(n):
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return n if n < 8 else n - 16
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def i8(b):
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return b if b < 128 else b - 256
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def decode_full_tran(body):
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"""Decode all Tran samples in the body, walking through segments."""
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if len(body) < 7 or body[0:3] != b"\x00\x02\x00":
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return None
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T0 = int.from_bytes(body[3:5], "big", signed=True)
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T1 = int.from_bytes(body[5:7], "big", signed=True)
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# Locate first tag
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i = 7
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while i + 1 < len(body) and body[i] not in (0x00, 0x10, 0x20, 0x30, 0x40):
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i += 1
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blocks = walk_body(body, i)
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T = [T0, T1]
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cur = T1
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for bi, blk in enumerate(blocks):
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if blk.tag_hi == 0x40:
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# Segment header — try interpreting bytes [0:2] as new T anchor
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if len(blk.data) >= 2:
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new_anchor = int.from_bytes(blk.data[0:2], "big", signed=True)
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# The next sample IS this anchor value, NOT a delta from cur.
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T.append(new_anchor)
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cur = new_anchor
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elif blk.tag_hi == 0x10:
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for byte in blk.data:
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for nib in ((byte >> 4) & 0xF, byte & 0xF):
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cur += s4(nib)
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T.append(cur)
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elif blk.tag_hi == 0x20:
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for byte in blk.data:
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cur += i8(byte)
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T.append(cur)
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elif blk.tag_hi == 0x00:
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# RLE: append NN zero deltas
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for _ in range(blk.tag_lo):
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T.append(cur)
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# 30 NN: skip
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return T
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def main():
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for stem in ("M529LL1L.V70", "M529LL1L.JQ0", "M529LL1A.SP0", "M529LL1A.SS0", "M529LL1A.SV0"):
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path = f"tests/fixtures/5-11-26/{stem}"
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with open(path, "rb") as f:
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body = f.read()[43:-26]
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_, samples = _parse_txt(path + ".TXT")
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truth_T = [round(v*200) for v in samples["Tran"]]
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n_truth = len(truth_T)
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decoded = decode_full_tran(body)
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n = min(len(decoded), n_truth)
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matches = sum(1 for i in range(n) if decoded[i] == truth_T[i])
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# Find first divergence
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div_at = -1
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for i in range(n):
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if decoded[i] != truth_T[i]:
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div_at = i
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break
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print(f"{stem}: decoded={len(decoded)}, truth={n_truth}, matches={matches}/{n}, first div={div_at}")
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if div_at >= 0 and div_at < 30:
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print(f" truth around div [{max(0,div_at-3)}:{div_at+8}]: {truth_T[max(0,div_at-3):div_at+8]}")
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print(f" pred around div [{max(0,div_at-3)}:{div_at+8}]: {decoded[max(0,div_at-3):div_at+8]}")
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if __name__ == "__main__":
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main()
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