Extraction of MDCT coefficients on MP3 or WAV previously compressed

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Extraction of MDCT coefficients on MP3 or WAV previously compressed

Rodrigo Cenachi Araújo
Hi,



I'm doing a master's on detection of double compression on MP3 audio files.
I need to extract the MDCT (Modified Discrete Cosine Transform)
coefficients of MP3 file or WAV previously compressed. The related work
that i found utilized the LAME MP3 (http://sourceforge.net/projects/lame/ )
encoder to do that extraction, but i found it's very difficult to use for
that objective. There is a minimal documentation on the file HACKING of the
link. It only describes that is possible to compute the MDCT coefficients,
but i don't know how to do it.



I appreciate any help.


Thanks,

Rodrigo Araujo
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