Using native iOS audio loader

[rahul140490]

Hi @dbogdanov , in one of your comments in some issue you mentioned that for iOS apps we can use native audio loaders instead of using MPPEG or monoloader/audioloader. Would you please describe how we can do that?
Please take one of the available examples to explain(preferably standard_mfcc.cpp class as I am working on that).

Also, I built the essentia library using monoloader and audioloader, but was getting undefined symbols error(like Undefined symbol: _av_frame_unref) so had to drop that.

[dbogdanov]

We do not have ready-made examples of that (anyone is welcome to contribute). What I meant is that you can look at the ways to load audio files that iOS provides, but iOS is out of my scope and perhaps someone here working with it can answer you better, especially given the PR #1153.