You have to make sure you have the accompanying .ABK files.
The .ABK files were not in the same directory as the .AST files. They were hidden in a .BIG file in the USRDIR directory.
To extract .BIG files, I used the FinalBIG program. Once the .ABK files are extracted, copy the .AST files into the same directory. Then, drag the .ABK files into foobar2000. It goes without saying you should have the vgmstream component installed :)
Congratulation!Thanks razzledazzle for giving the way to play nba audio! First i think ps3 games use ea layer3(mp3),then i use ealayer3-0.7.0-win32 and get error Now i found sns file Matching snr file