The audio codec application is removed from UMC from IPP 6.0. It the application is needed for you, I think you can look the old application sample code, and port it to 7.0. But note, they are not validated and support with new version now.
I am not sure which sample code you are downloaded, This is link to our sample code page - http://software.intel.com/en-us/articles/intel-integrated-performance-primitives-code-samples/
Download Main sample, this has got audio sample including umc_audio_codec.cpp.
Main reason to recommend UIC instead of individual codec is, it has got implementation on top of abstract base classes.
Only document is available in the sample folder, also a Knowledge base article - http://software.intel.com/en-us/articles/intel-ipp-uic/
Porting guide is not available...