[Mp4-tech] [ISOLib] how to use user data function in isolib

[Houari]

Dear all,
I wonder can I use ISONewForeignAtom and ISOGetForeignAtom to create my own-defined box in the ISOLib.
If it is so, I think that would be simpler that modifying the ISO lib code. The problem is, how can I use those function? Since there is no example in the document.
It would be nice if someone can give or point to link for this.
Thank you in advance...
Regards,
- Houari
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