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I’m looking for a library that could be used to manipulate audio files. Essentially what I would like to do is:
Load an MP3/WAV file
Get a 15 second clip of the file
Overlay another MP3/WAV file ontop of it
Render as a new MP3/WAV file
You can use any common MP3 codec API to decode the stream, work with it, and save it again. For instance you could use libLAME for this part.
As for mixing, you could either do it yourself (e.g., naively, add two samples and divide by two — which might not sound too good), or find a proper library for it.
You might also be interested in a related Stack Overflow question at best c audio library linux