GF_ISOFile from Memory Buffer

[Ahmed Hamza]

Thanks for the great framework. It seems that most of functions in libgpac operate on GF_ISOFile objects. I have the MP4 data in a memory buffer. Would it be possible to obtain a GF_ISOFile object from a memory buffer? If so, where can I find the necessary API functions. If not, what needs to be done to achieve this?

Thanks.

[Romain Bouqueau]

What operations do you plan to do? Demux? Mux? Split? ...

[Ahmed Hamza]

I need to perform two operations. I need to read samples from an MP4 container to extract the elementary stream NALUs. I'm able to do that on ordinary files but I would rather avoid any disk I/O operations if possible since the data is already in-memory after being downloaded. And I also want to perform re-muxing of scalable video streams (i.e., generate a single decodable file from two files, each containing one layer).

[Romain Bouqueau]

Here is a demux example from memory: https://github.com/gpac/gpac/blob/master/applications/testapps/fmp4demux/main.c

It is complex because it can handle incomplete ISOBMF (e.g. being streamed).

[Ahmed Hamza]

Thank you very much! That is exactly what I was looking for.