Support Opus codec

Hi,

Thanks for the library, is there a plan to support Opus codec conversion like Vorbis is already in? Maybe you can use https://github.com/google/opuscpp as single header dream

Thanks!

I'm unlikely to have time or reason to look at it in the near future, but it'd nice to have.

If you need it, you could always have a go yourself by following the pattern used for the other formats, and I'd be happy to help get it to a releasable state.

Thanks for quick response, I need to review and maybe I will try to implement

This would be very useful to have.