Audio generation and analysis framework in C++

Question

Hello,

I am looking for a C++ framework that can synthesise audio and also has the ability to analyse audio input for its frequencies. What I am trying to do is create a digital transmission algorithm that can transmit data and text via audio.

It should be possible to create an audiostream with different frequencies and phasing at one time and to analyse an incoming stream for its frequency parts.

Does anyone know of a library that can do such things?

Thanks in advance, Norman