Recording hi-res content from iradio on hdx

With more hi-res content appearing on iradiothere is likely to be some good live material that I would like to be able to capture from my hdx. I understand how I could do this by running iradio on a pc, but I would like the functionality I had usingcassettes, and my old revox b77 for analogue, but to be able to save as 24bit/192 flac or wav files saved on my nas, to be replayed through my hdx. Any advice would be appreciated, thanks,

Jeff