How to create audio visualizer?

Hello everyone,

I'm new to Qt, I created a Audio player. It works fine. now i want to create a audio visualizer.

Please help me which Class i have to read.

There is no such class in Qt, as far a I am aware there is no such widget in external additions to Qt but You can look for it in google.
I think that You will have to create your own equalizer class inherited from QWidget and than draw on this widget. With signals&slots mechanism you will control state of equalizer/visualizer.

Maybe you can get some ideas from this.