No not really. Elaborating on where I was originally heading with this, as my primary source I use a 2010 Mac Mini running iTunes, which in turn is plugged into a HRT Streamer II+ DAC. The Mac Mini streams lossless files from a NAS. Back in July I had thoughts about selling the Mac Mini and buying a cheap old iPad, such as an iPad 2, and use it to stream my library losslessly from my NAS to an AE, which in turn I had hoped would acknowledge my HRT II+ DAC when plugged into its USB socket and use it as an output device. But as explained to me, the USB socket is only for WiFi printing.
The DAC is USB powered and has no other input, so it wouldn't be compatible with an ATV either, I imagine.
In the end I gave up on the idea and carried on using the Mac Mini linked to the HRT II+