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I use the RtAudio library.
I would like to implement an audio program where I can control the panning (e.g. shifting the sound from the left channel to the right channel).
In my specific case, I use RtAudio in duplex mode (you can find an example here: duplex mode). It means that I link the microphone input to the speaker output.
I have searched on the web, but I did not find anything useful. Should I apply a filter on the output buffer? What kind of filter?
To pan a sound, you just have to reduce the volume in one channel while increasing it in the other. But you have to do it in such a way that the overall volume does not change, since a center pan will have two channels producing sound instead of one (full left or full right pan).
More info here: http://logicquicktips.blogspot.com/2006/10/laws-of-pan.html