Encode and Decode Audio

Hi

I am working on Screen Capture and Encode it (Screen Capture) to h264. All this is working fine. Now i want include Audio in this.

Guide me how to add Audio to Encode and Decode it with Screen Capture i.e., Audio that is running at the time of screen capture(i.e., Screen Capture when the VLC player is playing vedio file with it's audio) and also Audio of Mike.

Till now Encoding of Screen Capture into h264 is working fine.

Also, if there any sample_Code for Audio encoding and decoding then provide me please.

Help me in adding audio Encoding/Decoding in it.

Thank you