#34 Opus support

[Steven Ruppert]

I want to be able to listen to opus streams, e.g., from the beta version of icecast (2.4).

How hard would it be to add support? From some cursory googling, ffmpeg does support a libopus backend, and others have attempted to build it on android. I'm not terribly familiar with ffmpeg or Android NDK/JNI stuff, but if anybody could provide light guidance, I could probably implement this.

For testing, some opus streams: http://dir.xiph.org/by_format/Opus