How to render a self-written widget in Gtk

I've been writing a Gtk+ Widget which plays videos and, using libAV, I can load and read video files but I don't know how to get the frame data rendered as a widget. What do I do to render it? The frame data consists of an array of unsigned chars.

>>8
>spend several hours fucking about
You are using an "OOP" system implemented in C with clusterfuck of a GUI library implemented on top.
You have to read the documentation.
There are no shortcuts.

I wrote you an example widget that draws data from a memory buffer:
http://www.mediafire.com/?fiotik2h23t54q3
It's Gtk3 code though.