[gdal-dev] lib to get from GDAL/geotiff to PROJ4

[wsvries]

Hi,
I am working on an application (adding terrain info to maps for 3D 
rendering) that does some heavy projection calculations using the proj4 
libs.
Input for now is geotiff.
I have Googled a lot, but I was not able to find any libs that can 
output proj4 strings based on geotiff input.
I have seen (GDAL based) utilities that are able to do that but no libs 
to use in my application.
Any hint is welcome.
Thanks.