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LR-IMP-FORMATS: decode Canon EOS R5 Mark II C-RAW (CRX QP-map first literal and escape)

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The CRX 0x200 QP map opens with its first symbol as a 32-bit literal; every
later symbol is Rice coded with a limited-length escape: 23 zeros, the
terminating 1 and the symbol in 8 bits (the ITU-T T.87 layout for a 32-bit
limit and 8-bit symbols, without its minus-one offset). The old rule (an
escape after 16 zeros with a 16-bit literal) matched only the first symbol,
which is all the R8 and R7 maps need. R5 Mark II maps (QP 150-162) jump by up
to 12 where the Rice parameter is 0, giving 18- to 22-zero prefixes that
misparsed ("Canon CRX adaptive QP value -21087"): 174 of 306 sampled files
from a private R5 Mark II library opened as previews. Every QP map of its
33,665 C-RAW files now decodes to the exact end of its entropy stream; the six
oracle fixtures are unchanged. Established by black-box analysis of the
bitstream; no third-party decoder source consulted.

Adds the four CC0 R5 Mark II samples (raw.pixls.us 7881-7884) to the corpus
with pinned sensor hashes (the crop-mode framing is left to #754), bumps
RENDER_CACHE_VERSION to 43, and updates cr3.md, raw-parity (235 verified
models), coverage, gaps, the checklist rows, ROADMAP, target-app-parity and
What's New.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
ingolfteetzandClaude Opus 5.5 committed 2026-10-11 09:20:49 +02:00
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commit 4700c8a74e
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docs/raw/coverage.tsv
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@@ -188,7 +188,7 @@ Canon EOS R1 CR3 2023 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 s
Canon EOS R3 CR3 2021 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R5 CR3 2019 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R5 C CR3 2021 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R5 Mark II CR3 2023 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R5 Mark II CR3 2023 verified corpus: crates/raw/tests/cr3_corpus.rs (pinned sensor hashes, docs/cr3.md); bulk: QP maps of 33,665 C-RAW files
Canon EOS R6 CR3 2019 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R6 V CR3 2025 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
Canon EOS R6 Mark II CR3 2022 unverified CRX decoder: lossless and C-RAW 0x100 / 0x200 single-tile; other variants fall back to the preview
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