Understanding the code: Frames of a video

[VirMarGu]

Hello,
I'm developing an Android application for video. I've been reviewing all class of VLC for Android and I have understood how VLC gets thumbnail of a video, but I haven't seen what class makes the decoding of frames and the presentation of video frames.
I understand that when VLC receives a video in streaming, VLC is able to decode the video and get its frames and then displays them.

I need help finding what methods perform the decoding of frames and how VLC display this video.

Thanks and sorry