tests: add CEA-608 SCC test corpus (pop-on, roll-up, special chars)#2256
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DhanushVarma-2 wants to merge 1 commit intoCCExtractor:masterfrom
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tests: add CEA-608 SCC test corpus (pop-on, roll-up, special chars)#2256DhanushVarma-2 wants to merge 1 commit intoCCExtractor:masterfrom
DhanushVarma-2 wants to merge 1 commit intoCCExtractor:masterfrom
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Hand-crafted SCC test files for validating CEA-608 subtitle decoding: - popon_basic.scc: pop-on mode (ENM/RCL/PAC/EDM/EOC, multi-line, speaker change) - rollup_basic.scc: roll-up mode (RU2->RU3 switch, CR scrolling) - special_chars.scc: special chars (music note, registered, trademark) and extended chars (accented E/I/A with replacement semantics) Includes generate_scc.py (reproducible generation with parity table), expected SRT reference files, and run_tests.sh for automated diffing.
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The files live in tests/cea608_corpus/ and cover:
Pop-on captions (popon_basic.scc) — the standard buffer-flip workflow with ENM/RCL/PAC/EDM/EOC. Tests single-line, multi-line, and the >> speaker change convention.
Roll-up captions (rollup_basic.scc) — starts with 2-row roll-up, switches to 3-row mid-stream, tests carriage return scrolling behavior.
Special & extended characters (special_chars.scc) — music notes, ®, ™, and accented characters like É, Ï, À. The extended characters use the replacement semantics where they overwrite the previous character, which is a common source of bugs in 608 decoders.