iOS - how can I add audio files into another audio file?

Question

I want to add some can music or sound effect into an audio that recorded using avaudiorecorder. How can I do it? Thanks.

Answer 1

Audio mixing can be really challenging. You need to mix the two waveforms-- combine the data programatically.

Here is a nice little demo showing one way to do so.

And here is another answer with some ideas.

and another sample.

Sorry for all the links, but this is a pretty complicated question.