Any digital signal is already converted anilog if it can drive speakers, amps.
So, I'm not sure if I fully understand the question.
Personally, I have a PC (just using the MB's sound chip), my TV, and an MP3 player feed into one of the inputs on my integrated amp.
All are feed into a simple 4 output source selector switch which is then fed into the amp.
It's simple and effective.
BTW, I can also feed my PC's video into my TV via a graphics card that can output to a HDMI jack.
So, I have all bases covered.