use of impl / private code in example utils; enumGenreType

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I'm wondering what the "right" way is to use code like enumGenreType, etc. as 
used by the example util code (mp4info) in the project.  I came across the 
issue dealing with genre and genreType tags, found issue #45 
https://code.google.com/p/mp4v2/issues/detail?id=45 and saw the solution, but 
it isn't clear to me how to actually best use that solution in my own code.

The the enumGenreType, and associated enum templates used for toString, etc. 
all are in "private" code rather than the public interface.  It looks like the 
compiled library actually includes the code, but what's the right way to access 
it?  Do I really need to copy the header files, or the project itself, into my 
project to be able to use what is considered to be the solution to issue #45?

It looks like a nice solution.  Would love to be able to use it as simply as 
mp4info does.

Original issue reported on code.google.com by [email protected] on 11 May 2015 at 7:33