AnyPS5/docs/dev/debt/libSceAcm.md

libSceAcm technical debt

Silent stubs

• libSceAcm batches execute as silent no-ops, and do not execute encoded panner, FFT and reverb commands.

Unknown function info

• Additional ACM exports - the eleven name/NID pairs below are defined exports in the firmware 13.60 inventory. Their ABIs and behaviour are unknown. Parameterless int declarations are import-resolution placeholders, not established signatures; every call throws NotImplemented_nid_no_patch. No audio-chain, reverb or telemetry behaviour is implemented.

Name	NID
sceAcmChain_Audio3dPO1_Clear	+o6KUwnCB+0
sceAcmChain_Audio3dPO1_RenderObject	0P2PH7lou4g
sceAcmChain_Audio3dPO1_Activate	5pi7bGbV7JM
sceAcmChain_Audio3dPO1_Output	7EGMt3d6RAk
sceAcm_ConvReverb_SharedIr_2	PVx9oQUaDdk
sceAcmChain_Audio3dPO1_RenderAmbisonicsChannel	ZViifnXeAUc
sceAcmChain_Audio3dPO2_Activate	aUfAPcEySHU
sceAcmChain_Audio3dPO1_RenderPassthroughObject	eU9FRHNi+xU
sceAcmChain_Audio3dPO2_RenderDelay	p23f04CznHs
sceAcmGetTelemetry	vQb-lO9SzEI
sceAcm_ConvReverb_SharedInput_2	wM41Cc+ieog

• libSceAcm context creation, batch submission and waiting use host identifiers instead of the native device and ioctl requests. Batch identifiers, timeout handling, DSP scheduling and service-side errors remain unimplemented. Panner source parameter and matrix payloads are forwarded by the native library; their DSP interpretation remains unverified.

• sceAcm_ConvReverb_SharedIr (libSceAcm) - its name and NID are in the PS5 3.20 export inventory, but no credible prototype was found. It is declared without parameters solely to resolve known imports; this is not an ABI claim

• sceAcm_FFT and sceAcm_IFFT encode their jobs as libSceAcm.sprx does on firmware 13.40, where both exports call one encoder with a direction flag (read from the module's code and compared with that code run on x86-64, not measured on a console). PPSA14632 imports sceAcm_FFT; no known title imports sceAcm_IFFT. The DSP meaning of the job words is unverified.

• sceAcmBatchJobNotification is a parameterless pending declaration for import resolution. Its signature and behavior are unverified; it throws through NotImplemented_nid_no_patch.

• sceAcm_ConvReverb_SharedInput encodes the reverb jobs as libSceAcm.sprx does on firmware 13.40 (read from the module's code and compared with that code run on x86-64, not measured on a console). PPSA01317 calls it during boot with 512-sample blocks. Its input stage appends one sceAcm_FFT job of twice the block size (256 points for 128-sample blocks). The meaning of the reverb descriptor's block metadata for the DSP is unverified.