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Wisconsin
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Hello,

So I have a project that cant exactly house an arduino or its MP3 Shield.  So I was curious, cause I see so many mp3 shields out there with different things, what exactly is needed to play mp3s from an SD card out a speaker?
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Gosport, UK
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Have a look at http://mp3-tech.org/programmer/decoding.html for mp3 decoding sources.

The sd library is easy to examine.
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Those look like decoders that would be used on a PC.  Am I supposed to put a decoder on a microcontroller?
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No, or at least not on an Arduino. An Arm based microcontroller could probably do it.

I probably misunderstood your question. Are you wanting to build a smaller, standalone version of arduino/mp3 shield?

I found this http://www.pjrc.com/mp3/sta013.html which might be of use.
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Oh that does look useful.
So I would load up a song on the SD and then shoot it over to this chip and then connect a speaker to the chip and BOOM! it plays sexy and i know it?
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It looks like you need a DAC too, but basically that's it.
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It looks like that is something more so for a pic application or something standalone.  Is there something that is more....arduino friendly? or AVR friendly?
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Generally, an mp3 shield.
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Blech, this sounds like its going to be tough...
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What about http://www.gravitech.us/mp3pladforar.html ? Small enough?
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Nah, I need it to pull from an SD card.
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It has a microsd slot on it.
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Yea I just noticed that, even still it can't be in a ready made module since I'll need to put it all on a board myself. 

I'm more so looking for a guide that somebody did and put it on the internet.
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maybe looking using .wav files.. and  making a 'custom' Arduino/WaveShield hybrid board..

there are already 2 libraries out for playing .wav files by author: fat16lib

and I think Adafruit has the schematics posted for the shield to look at?

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ohhhh schematics, eh? I'll check that out.  isn't waveform only a mono speaker? I wanna play some sweet Sexy and I know it and I don't think it would sound right if It was mono.
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