I want to transplant the sound part of Shadertoy

Hello everyone.
I’d like to port this shadertoy code to openframeworks, but what about the part of iChannel0?

https://www.shadertoy.com/view/4slGz4

ofTexture channel0
shader.setUniformTexture(“iChannel0”, channel0, 1);

How can I pass sound information in ofTexture?
I want to know how to convert the information of loaded mp3.

Take a look this