Convert source file from Object Pascal to Delphi Pascal

I have a Pascal unit written in Object Pascal (around 4000 lines of code). I need this file converted to Delphi Pascal sintax (should be able to compile on Delphi 7, very important!!) You should be familiar with the minimal differences between both Pascal dialects sintax. The unit is a OGG decoder, that comes with a sample test program. This test program receives a OGG file and outputs a WAV file. This is already working 100%, but requires Free Pascal Compiler to compile. The unit must be changed to allow compilation in Delphi 7.