Hi,
I am new to using/working on Vorbis command line code.
Can you please tell me how can I use the vorbis source code to compress and decompress the audio files at 48, 96, 192KHz.

I have downloaded libvorbis-1.1.2

http://www.xiph.org/vorbis/doc/vorbisfile/example.html

Here is a decoding example for reference.

http://www.xiph.org/vorbis/doc/vorbisenc/examples.html

Here is an encoding example for reference.

The library is designed to be pretty straightforward depending upon what you want to do. Calculating the sample rate would just require some trivial multiplication.