Has anyone done MP3 or WAV on Gr-Sakura?


there's a web page about GR-Sakura and MP3 (http://homepage3.nifty.com/fpga/gr/), but unfortunately it's in Japanese. There are also some videos on YouTube, but no code is given.
And there's also some description about RX implementing MP3. But this is not easy to use for GR-Sakura.

Has anyone done any activity so far for implementing to play MP3 on GR-Sakura? (e.g. implementing libmad?)

If someone has implemented to play WAV, this would also be cool!

Many thanks for any hint