Alan is correct. If it's on a disc, it's digital. Period. The hires tracks are typically PASSED via analog because of copy protection concerns, and also because of the fact that the MUCH higher data rates are apparently too much for optical/coaxial digital connections. Most receiver manufacturers did not build in the decoding chips for high res tracks either (probably because they wanted to see which one would survive), and without those, you must rely on the player to do the decoding.
Spiffy, DVD-A and SACD are considerably higher resolution than DD/DTS digital tracks, they are basically like MP3 - compressed formats that keep the data rates down.
If you like NIN, go pick up the DTS version of And All that Could Have Been DVD. It's full bitrate (1509k) DTS and the sound is pretty amazing. Most movies are half bitrate (754k).