Watch Vimeo video into AIR iOS app

Hi, I'm currently developing a mobile app in Adobe AIR.

I need to display a full screen video and I saw that the perfect way is to link the user to an .mp4 file into vimeo using this very basicly code:

myButton.addEventListener(MouseEvent.MOUSE_DOWN,fn_video);

function fn_video(e:MouseEvent):void{

     navigateToURL(new URLRequest("myVideoOnVimeoURL.mp4"));

}

It works perfectly... but now my question is if there's a way to obtain the direct URL of a video into Vimeo.

From the web site it is possibile... but I need to obtain that path automatically.

AS3, PHP, JavaScript...doesn't matter the language, I only need a code to study on.

Cheers

Bran