11 lines
2.5 KiB
Markdown
11 lines
2.5 KiB
Markdown
# libSceAudioPropagation technical debt
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### Silent stubs
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- [libSceAudioPropagation](../../../core/libs/prx/libSceAudioPropagation/Export.cpp) implements only the no-acoustic-propagation path: the system keeps a 16-byte header in the title's CPU memory (no GPU memory), rooms, portals, sources and materials are tracked handles, attributes are validated and have no effect, no rays are requested and sources report no audio paths. Ray results, path calculation and audio paths are accepted only when empty and throw otherwise; `sceAudioPropagationSourceRender` writes silence (zeroes) to each source's output buffer for the given size, without a dry signal. Objects still alive when their system is destroyed become unusable, and their later destroy or unregister is a no-op: PPSA21567 releases its reference-counted room, portal and source owners just before `sceAudioPropagationSystemDestroy`, so the order for every object is not proven. Occlusion, reflections and reverb from level geometry are absent; in-game behaviour remains unverified.
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### Unknown function info
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- [sceAudioPropagationSourceSetAudioPath](../../../core/libs/prx/libSceAudioPropagation/Export.cpp) (libSceAudioPropagation, NID `tKSmk2JsMAA`) - `(uint64_t path, const void* data, float gain)` follows [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/5dfdb4b0b166e83dc9ae275001afb695f12c7174/src/SharpProspero/Interop/Audio/AudioPropagation.cs) and SAROS's call, which passes a handle from `sceAudioPropagationSourceGetAudioPath`, path data and gain 1.0. Path updates are unsupported and every call throws without reading or writing caller memory. The no-propagation model yields no path handles; path allocation, ownership, rendering and console error codes remain unknown.
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- [libSceAudioPropagation](../../../core/libs/prx/libSceAudioPropagation/Export.cpp) (libSceAudioPropagation) - signatures and struct descriptors recovered from PPSA21567's calls (#481), not from documentation. The system options layout is unknown (only checked for non-null); the fourth argument of `sceAudioPropagationSourceCalculateAudioPaths` is unknown; `sceAudioPropagationSourceGetAudioPath` is assumed to output an 8-byte path handle. The meaning of the `RenderInfo` word at +0x28 is unknown (PPSA21567 and PPSA21564 pass 2); only 2 is accepted. Both titles pass one `RenderInfo` per call: a count of 0 throws, and larger counts are handled element by element without proof. No error code is known, so invalid input throws instead of returning one
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