Claude
a0c9a482c7
User uploaded a Vert-heavy event (JQ0) and a Mic-heavy event (V70). Those two were exactly what was needed to crack the next piece: - 00 NN block = run-length-encoded zero deltas in the current channel. Append NN copies of the current cumulative value (no change). - find_data_start now recognizes 00 NN as a valid first tag (some events begin with a leading 00 NN RLE block). - decode_tran_initial now decodes the FULL segment 0 (not just the first data block). Results across 5 fixture events: - M529LL1A.SP0 (loud-all-channels) : 510 / 510 ✓ - M529LL1L.JQ0 (Vert-heavy) : 510 / 510 ✓ - M529LL1L.V70 (Mic-heavy) : 510 / 510 ✓ - M529LL1A.SV0 (loud-from-start) : 58 / 58 ✓ - M529LL1A.SS0 (loud-from-start) : 42 / 502 (stops at first 30 04) The 30 04 block (only seen in loud-from-start events) hasn't been decoded yet — likely a channel-switch marker for the high-amplitude regime. Also discovered: segment header (40 02) payload bytes [0:2] = T_delta at first sample of new segment, [6:8] = byte length to next segment. Multi-segment Tran decoding still diverges after sample 512 because the per-segment channel ordering after the header is unknown. Tests: 40 pass (up from 36). Files: - minimateplus/waveform_codec.py: find_data_start fix, RLE handling, full segment-0 decode in decode_tran_initial - tests/test_waveform_codec.py: synthetic RLE test, full segment 0 tests for JQ0 and V70 - tests/fixtures/5-11-26/: M529LL1L.JQ0, M529LL1L.V70 + TXT exports - docs/instantel_protocol_reference.md §7.6.1: RLE + segment-header docs
82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
"""Decode Tran across multiple segments by resetting at 40 02 headers."""
|
|
import sys
|
|
sys.path.insert(0, ".")
|
|
from analysis.load_bundle import _parse_txt
|
|
from minimateplus.waveform_codec import walk_body, find_data_start
|
|
|
|
|
|
def s4(n):
|
|
return n if n < 8 else n - 16
|
|
|
|
|
|
def i8(b):
|
|
return b if b < 128 else b - 256
|
|
|
|
|
|
def decode_full_tran(body):
|
|
"""Decode all Tran samples in the body, walking through segments."""
|
|
if len(body) < 7 or body[0:3] != b"\x00\x02\x00":
|
|
return None
|
|
T0 = int.from_bytes(body[3:5], "big", signed=True)
|
|
T1 = int.from_bytes(body[5:7], "big", signed=True)
|
|
|
|
# Locate first tag
|
|
i = 7
|
|
while i + 1 < len(body) and body[i] not in (0x00, 0x10, 0x20, 0x30, 0x40):
|
|
i += 1
|
|
|
|
blocks = walk_body(body, i)
|
|
T = [T0, T1]
|
|
cur = T1
|
|
for bi, blk in enumerate(blocks):
|
|
if blk.tag_hi == 0x40:
|
|
# Segment header — try interpreting bytes [0:2] as new T anchor
|
|
if len(blk.data) >= 2:
|
|
new_anchor = int.from_bytes(blk.data[0:2], "big", signed=True)
|
|
# The next sample IS this anchor value, NOT a delta from cur.
|
|
T.append(new_anchor)
|
|
cur = new_anchor
|
|
elif blk.tag_hi == 0x10:
|
|
for byte in blk.data:
|
|
for nib in ((byte >> 4) & 0xF, byte & 0xF):
|
|
cur += s4(nib)
|
|
T.append(cur)
|
|
elif blk.tag_hi == 0x20:
|
|
for byte in blk.data:
|
|
cur += i8(byte)
|
|
T.append(cur)
|
|
elif blk.tag_hi == 0x00:
|
|
# RLE: append NN zero deltas
|
|
for _ in range(blk.tag_lo):
|
|
T.append(cur)
|
|
# 30 NN: skip
|
|
return T
|
|
|
|
|
|
def main():
|
|
for stem in ("M529LL1L.V70", "M529LL1L.JQ0", "M529LL1A.SP0", "M529LL1A.SS0", "M529LL1A.SV0"):
|
|
path = f"decode-re/5-11-26/{stem}"
|
|
with open(path, "rb") as f:
|
|
body = f.read()[43:-26]
|
|
_, samples = _parse_txt(path + ".TXT")
|
|
truth_T = [round(v*200) for v in samples["Tran"]]
|
|
n_truth = len(truth_T)
|
|
|
|
decoded = decode_full_tran(body)
|
|
n = min(len(decoded), n_truth)
|
|
matches = sum(1 for i in range(n) if decoded[i] == truth_T[i])
|
|
# Find first divergence
|
|
div_at = -1
|
|
for i in range(n):
|
|
if decoded[i] != truth_T[i]:
|
|
div_at = i
|
|
break
|
|
print(f"{stem}: decoded={len(decoded)}, truth={n_truth}, matches={matches}/{n}, first div={div_at}")
|
|
if div_at >= 0 and div_at < 30:
|
|
print(f" truth around div [{max(0,div_at-3)}:{div_at+8}]: {truth_T[max(0,div_at-3):div_at+8]}")
|
|
print(f" pred around div [{max(0,div_at-3)}:{div_at+8}]: {decoded[max(0,div_at-3):div_at+8]}")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|