FMOD::Studio::System::loadBankMemory randomly fails with FMOD_ERR_INVALID_PARAM, despite seemingly being passed the same parameters

FMOD Studio
1

Issue was due to me misunderstanding and 32-byte aligning buffer size rather than the actual memory address. Issue resolved.

2

When using FMOD_STUDIO_LOAD_MEMORY_POINT, the buffer needs to be 32-bit aligned. Which would explain why you don’t get this error every time.

https://www.fmod.com/resources/documentation-api?page=content/generated/FMOD_Studio_System_LoadBankMemory.html#/

Make sure to keep the buffer around, you can only free it after receiving a FMOD_STUDIO_SYSTEM_CALLBACK_BANK_UNLOAD callback, otherwise use FMOD_STUDIO_LOAD_MEMORY to create a copy.

https://www.fmod.com/docs/api/content/generated/FMOD_STUDIO_LOAD_MEMORY_MODE.html

1 Like
3

If you look at my original code sample, you’ll see that it actually is aligned correctly (it’s 32 bytes btw, not bits, but it uses a define anyway)

And yes, I am keeping it in memory

4

Can you try with the logging libs, they should provide more information on the cause.

5

Looks like FMOD seem to think that the data isn’t 32 byte aligned

[ERR] AsyncCommandTableShadow::system_loadBankMemory : Error! FMOD_STUDIO_LOAD_MEMORY_POINT buffer is not 32-byte aligned!

However, I’m pretty sure that 800 bytes are aligned to 32 bytes?

I logged my variables just to be sure:
BANK SIZE: 800, WAS 774, PADDED WITH 26

This only happens for this bank as well. The other banks are much larger and always loads correctly:

BANK SIZE: 12480, WAS 12474, PADDED WITH 6
BANK SIZE: 5663456, WAS 5663456, PADDED WITH 0

6

Or wait, should the actual memory address be aligned to 32 even bytes? Not just the actual size… ?

7

Yup, that seemed to have been the case. My bad! And thank you for the support Cameron, very appreciated!