use taglib to find start of the audio data?

[Michael Helmling]

Hi Taglib,

is it possible to determine at which position in the binary data of an 
audio file the audio data itself starts, i.e. where the end of the 
metadata block(s) is?
I would like to be able to generate hashes of the audio data only, in 
order to identify audio files even if they have been renamed and/or tags 
were changed; I assume that the raw audio stream itself normally never 
changes.
I am aware that this is not the original task of taglib as a metadata 
library, but I guess that the information I want is generated as a 
by-product anyway while parsing metadata, so it might be possible to 
extract it easily. Or is this generally a silly approach because there 
could be formats that interleave metadata and audio blocks, for example? 
Does anyone know how to do it otherwise? At the moment I am calling 
'mplayer -dumpaudio' as a workaround, which doesn't seem very clever 
after all. ;-)

Michael