# libSceAt9Enc technical debt

### Unknown function info

- [libSceAt9Enc](../../../core/libs/prx/libSceAt9Enc/Export.cpp) (libSceAt9Enc, sysmodule id `0x000000d1`) has no encoder, so all five exports throw: `sceAt9EncClearContext`, `sceAt9EncCreateEncoder`, `sceAt9EncEncode`, `sceAt9EncFlush` and `sceAt9EncQueryMemSize`. PPSA03332 imports them and fails to load (`libSceAt9Enc.prx: cannot open shared object file`) when the library is absent. The names are from the aerolib NID list, and the name reads as the ATRAC9 encoder, unconfirmed
- [sceAt9Enc*](../../../core/libs/prx/libSceAt9Enc/Export.cpp) (libSceAt9Enc) - the signatures follow [Orbital](https://github.com/AlexAltea/orbital/blob/cc408367da6a6ebbf5ac1ac559fefeadc73b2831/tools/ida/db_types.json), which gives `int32_t sceAt9EncClearContext(void *pAt9EncWorkArea, int32_t *pInternalResult)`, `int32_t sceAt9EncCreateEncoder(void *pAt9EncWorkArea, struct *pAt9EncParam, int32_t memSize, int32_t *pInternalResult)`, `int32_t sceAt9EncEncode(void *pAt9EncWorkArea, const void *pInputBuf, void *pOutputBuf, uint32_t inputBufSize, uint32_t outputBufSize, uint32_t *pOutputDataByte, uint32_t *pUsedBufSize, int32_t *pInternalResult)`, `int32_t sceAt9EncFlush(void *pAt9EncWorkArea, void *pOutputBuf, uint32_t outputBufSize, uint32_t *pOutputDataByte, int32_t *pInternalResult)` and `int32_t sceAt9EncQueryMemSize(struct *pAt9EncParam, int32_t *pMemSize, int32_t *pInternalResult)`. Its `struct *pAt9EncParam` is a placeholder, so that parameter's layout is unknown