Learn mp3 format and audio signal processing

Posted by Shankhoneer Chakrovarty on Stack Overflow See other posts from Stack Overflow or by Shankhoneer Chakrovarty
Published on 2012-03-23T05:24:32Z Indexed on 2012/03/23 5:30 UTC
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java

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mp3

I am trying to learn the following things:

How mp3 file looks like internally? I found this: http://mpgedit.org/mpgedit/mpeg_format/MP3Format.html but it seems old. Is there any recent changes to the format? I couldnt find any.
How to open a mp3 file in java and look for bytes? I tried using audiostream but I am getting a lot of zeros and signed short integers which nowhere resemble the header/body format as mentioned in the above link. Am I wrong in interpreting the bytes?
How to get amplitude, frequency and pitch of a mp3 file? No idea. Can you please suggest some book or tutorial?

Can you please help me in getting the solution for the above questions? I am sorry if some questions appear to be naive, I am a just begun to learn mp3.

Thanks

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