url地址解密问题！

http://infinitinb.net/COFFdD0xMzY1NTE2NDY5Jmk9MjcuMTUwLjMyLjE1NiZ1PVNvbmdzL3YxL2ZhaW50UUMvMDEvZTIyMmM0YzlkMWIwZDhlMjlhMTdhZGFhNTFlYjhjMDEubXAzJm09MTE2ZGMyYTFjMDMxODg1YmNiNzg2OWVjNWVhNzk4Y2Umdj1saXN0ZW4mbj3U2sr3yc+zqrjoLiZzPbn5vrImcD1z.mp3
http://upupyoyoyo.net/COFFdD0xMzY1NTE2NzI5Jmk9MjcuMTUwLjMyLjE1NiZ1PVNvbmdzL3YyL0IxLzRELzM4MjM2XzUwNjA4Nl+3ycLWuqMtsru74bCuLndtYSZtPTBkM2M0Y2Y4MDU5ZDJlMThlMjQxOTMwZjEzNGRiYTgwJnY9ZG93biZuPbK7u+GwriZzPbfJwta6oyZwPXM=.wma
这个地址 是用什么加密的！ 
用php 怎么解啊！！！解密