Rockbox Technical Forums

Rockbox General => Rockbox General Discussion => Topic started by: RobioCraft on October 29, 2020, 07:40:22 AM

Title: Bypassing iPod Classic DAC and outputting digital stream via Rockbox software
Post by: RobioCraft on October 29, 2020, 07:40:22 AM
Hello, I've seen some posts regarding this but none lead to any development.

I think this theoretically would be possible, because few amp+dac combo devices like Sony PH-1, Fostex HP-P1 (for ex.) are able to bypass iPod's internal DAC and use their own hardware. I've read that this is possible by the apple authentication chip that was manufactured when these companies had a deal with apple. So it could be possible to reverse engineer the key from these authentication chips so Rockbox can use it in software to gain access to iPod's digital stream and output it via 30pin adapter.

It's probably way more times more complicated, than In theory, but I'd love to hear input from others.
If came to fruition then iPod would serve as a media and playlist device and would no longer be held back by it's dac, and would be able to utilize way more modern hardware, there are a lot of good and affordable external amplifier+dac devices on the market.
Title: Re: Bypassing iPod Classic DAC and outputting digital stream via Rockbox software
Post by: saratoga on October 29, 2020, 11:42:17 AM
Hello, I've seen some posts regarding this but none lead to any development.

There is nothing usable, but there has been development over the years:  https://gerrit.rockbox.org/r/#/c/rockbox/+/1009/

If came to fruition then iPod would serve as a media and playlist device and would no longer be held back by it's dac, and would be able to utilize way more modern hardware, there are a lot of good and affordable external amplifier+dac devices on the market.

DAC in the iPods is good enough for 16 bit audio, which is all we output anyway, so not a huge reason to lug around a separate DAC when you could use the internal one more efficiently.