How do I check the current amplitude/volume of the sound

[kepexx]

It's done in games like Geometry Dash. In GD, the orbs get bigger if the music gets louder as a visual effect. I want to do something similar to that.

This isn't the volume method, since that just gets a multiplier that we multiply with the samples to make it louder/quieter. I want the actual, current volume that the person hears.

[jedahan]

surprisingly difficult to find a cross-platform example of getting the current default mixer volume.

[anselanza]

I'm also interested in this. I presume getting access to the underlying stream, or at least samples of it, would be the way to go. In a separate thread, it would be useful to get "windows" of frames to analyse for volume, frequency analysis (FFT), etc. but I'm not sure how to even start, and I don't see any examples of doing this kind of thing.