why 'like'? rockbox is open source - you could use it as the main OS
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I just did a search on the web and there are several diy mp3 players....but we are looking for somthing alot more high end
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Makezine had one... it uses an all-integrated-chip. sd card interface, mp3 decoder, user interface, headphone amp... not really a good option.
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It would be sweet to see something flash based like a Shuffle (without a screen to make it easier on the developer, just buttons) with the 1/8th jack being a dedicated line out....i.e. useless without an amp, or can be used cans with an inline attenuator ala KSC 75s ampless.
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all that's really needed is something which accepts sd cards, and puts out an i2s or spdif signal. the rest can be borrowed from the alien dac or other usb-powered diy dacs. I'm interested in such a thing too. After my holidays, I'll try to find a chip which could one or more of the required things. Oh and why sd cards? 1. available everywhere 2. cheap 3. easy to adress from a hardware perspective 4. exchangeable. if you don't need multiple megabytes per second (320kbps mp3 equals just 40kb/sec), you can access sd cards with a simple serial protocol.
ti, maxim or ad surely have some mp3 decoders. maybe even with some extra stuff like spdif out... the other controling stuff could be done by an atmel microcontroller
edit: jonnywolfet: indeed interesting. seems like this guy wrote the mp3 decoder 100% in software, and used mm cards (sd cards are backwards compatible). but I don't think the on-chip dac could be considered audiophile.
edit2: looks like a software-emulated 1-bit dac. yep, maybe not audiophile...