Since Windows Media Player 6.1, Windows has its' own mp3 decoder. Can I use that decoder to get access to the decoded audio (raw) data?
I assume it would have to be done with DirectShow.
You can add a sample grabber into the graph after the mp3 decoder. The sample grabber allows you to configure a callback that gets called as each sample passes through the media pipeline.
Your graph would look something like
mp3 file -> mp3 decoder -> sample grabber -> renderer
来源：https://stackoverflow.com/questions/8125234/how-to-access-raw-decoded-audio-data-using-windows-built-in-mp3-decoder