feat(libSceAudioOut): implement sceAudioOutGetSystemState

[bcortezf]

What

Red Dead Redemption (PPSA30528) imports sceAudioOutGetSystemState (NID R5hemoKKID8) and fails to load without it:

FAIL: unresolved ELF import R5hemoKKID8 from libSceAudioOut.prx

This PR adds it with the same behaviour as the existing sceAudioOut2GetSystemState:

• Arguments and state: it takes a pointer to a 64-byte system state (a float loudness, padding and reserved words) and reports a loudness of 0.0f.
• Null pointer: returns 0x80260004, like the other AudioOut calls.

The signature and layout come from the shadPS4 and fpPS4 reimplementations, not from a console measurement. They are recorded under "Unknown function info" in docs/dev/debt/libSceAudioOut.md.

A unit test (audio_out_system_state) checks the result, the loudness and the null pointer.

Tested

Windows 11 (10.0.26200), MinGW build

• Unit test: ctest -R audio_out_system_state passes.
• Conventions: python3 tools/check_conventions.py --base origin/main passes.
• PPSA30528: with this export, the title loads past the import. It reaches gameplay on main a0f5916 plus this commit, together with separate local rendering workarounds that are not part of this PR. On current main, a fresh run of the title also needs its executable converted again with the current relinker, which I have not redone.

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 under Silent stubs in their library's technical debt file
• 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
• Unblocks: PPSA30528 (Red Dead Redemption): it does not load without this export
• GPUs tested: n/a
• AI-assisted: yes

[bcortezf]

could someone check this? @adriadam10

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
PR 6170	docs/dev/debt/libSceAudioOut.md L14-15

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 5021	core/libs/prx/libSceAudioOut/CMakeLists.txt docs/dev/debt/libSceAudioOut.md
PR 6044	core/libs/prx/libSceAudioOut/CMakeLists.txt
PR 6879	core/libs/prx/libSceAudioOut/src/AudioOut.cpp
PR 6964	docs/dev/debt/libSceAudioOut.md
PR 6977	core/libs/SceTypes.hpp
PR 7332	core/libs/prx/libSceAudioOut/CMakeLists.txt

[github-actions]

Progress report (ab9a476 → 46cd6d5)

📈 System libraries: 88.72% (+0.01%, +1 implemented functions)

✅ 1 implemented

Library	Name
libSceAudioOut	sceAudioOutGetSystemState

[adriadam10]

Thanks. Build and the AudioOut ctest scope are green here, and audio_out_system_state fails to build without the change. One thing to fix:

• core/libs/SceTypes.hpp:575 AudioOutSystemState is 64 bytes (copied from AudioOut2SystemState), but the sources the debt line cites say 32: shadPS4's OrbisAudioOutSystemState is float loudness; u8 reserved8[4]; u64 reserved64[3], and SharpProspero's SceAudioOutSystemState has Size = 32. Please use the 32-byte layout (std::uint64_t reserved[3]), and add a static_assert(sizeof(...) == 32).
• docs/dev/debt/libSceAudioOut.md:15: the layout is not from shadPS4/fpPS4 as written, so correct it once the struct matches. Also note there that shadPS4 returns NOT_INIT before init (not modelled) and that SharpProspero documents loudness in LKFS, so the constant 0.0f is unconfirmed.