[FFmpeg-user] How could I take a snapshot on a live stream with ffmpeg library?

[seaguest]

Hello everyone,

Sorry to spam you, since I am new and I couldn't find any material on 
this topic on the Internet.

I need to take a snapshot for given live stream, how should I do with 
ffmpeg library?

I know the corresponding command line is:
ffmpeg -i http://59.175.153.138/video/s10008-hbws/index.m3u8 -f image2 
-vframes 1 snapshot.jpg

but what should I do if I want to call the ffmpeg library code?

Is there any tutorial that shows the code entry corresponding to command 
line ?

best regards

Yongkan