[XairRrR]

What

Uncharted: Legacy of Thieves Collection (PPSA05684) plays its intro and menu movies through libSceVdecsw and stops on main with:

sceVdecswQueryComputeMemoryInfo not implemented

(#1208 and #1881 were closed because no title was shown reaching the module.)

• Decoder creation, compute queues, memory queries, decode input and output, AVC picture info, reset and finalize use the layouts of shadPS4's vdecsw.h, checked against the title's movie decoder; decoding goes through libSceVideodec2.
• At most four decoded pictures are queued. The last one is held until sceVdecswFinalizeDecodeSequence and marked as the last frame: the title waits for it to end a movie.
• What is inferred is recorded in TechnicalDebt; the eleven "unknown signature" entries are removed.
• The H.264 stream of guest_videodec2 moves to tests/H264Fixture.hpp; the new guest_vdecsw test decodes it through Vdecsw.

Tested

Arch Linux, GCC 16.2.1, NVIDIA GeForce RTX 4070 Ti SUPER (driver 615.71.09).

• The branch alone on current main (d70b899): tools/check_conventions.py passes; of the 514 ctest tests all pass except agc_driver_dcc_keys_first_write, which fails the same way on main (an unchanged pending image was uploaded again). agc_driver_storage_cache_budget passes run alone; under ctest -j8 a local 3 GB RSS limit stopped it.
• Uncharted: Legacy of Thieves Collection (PPSA05684): with this and the other changes of its bring-up, the title boots past the stop quoted above and reaches its main menu.
• the PlayStation Studios intro movie of the title plays with sound and ends, then the game continues.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed in TechnicalDebt
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• AI-assisted: yes

[popcoder565]

Native Windows run, since no Windows results were posted. Setup: Windows 10 (19045), MinGW-w64 GCC 15.2.0 (WinLibs r7), Release. Head 60c26120, merged onto main d70b899 in one build with 38 other PRs that had no Windows run.

• This PR's tests pass: guest_vdecsw, guest_videodec2. None of them reported skipping a case.
• Full ctest in that build: 519 of 519. That needed local fixes to three other PRs in the batch that don't build or pass on Windows: feat(libc): export scriptingGetMem and scriptingFreeMem from application heap #1611, feat(posix): implement gethostbyname #1796 and feat(zlib): implement sequential libSceZlib decompression #1824 (reported there).

No title was run.

🤖 Addressed by Claude Code

[adriadam10]

Checked on Linux (GCC, merged onto current main): build and ctest green for guest_vdecsw and guest_videodec2; guest_vdecsw fails without the change. Struct sizes and offsets match shadPS4 vdecsw.h; the inferred error codes and queue depth are recorded in TechnicalDebt. Windows run by @popcoder565 also passes. Merging once CI is green.

[github-actions]

Progress report (d70b899 → 60c2612)

📈 System libraries: 85.12% (+0.43%, +13 implemented functions)

✅ 13 implemented

Library	Name
libSceVdecsw	sceVdecswAllocateComputeQueue
libSceVdecsw	sceVdecswCreateDecoder
libSceVdecsw	sceVdecswDeleteDecoder
libSceVdecsw	sceVdecswFinalizeDecodeSequence
libSceVdecsw	sceVdecswGetAvcPictureInfo
libSceVdecsw	sceVdecswQueryComputeMemoryInfo
libSceVdecsw	sceVdecswQueryDecoderMemoryInfo
libSceVdecsw	sceVdecswReleaseComputeQueue
libSceVdecsw	sceVdecswResetDecoder
libSceVdecsw	sceVdecswSetDecodeInput
libSceVdecsw	sceVdecswSetDecodeOutput
libSceVdecsw	sceVdecswTrySyncDecodeInput
libSceVdecsw	sceVdecswTrySyncDecodeOutput