对音频的编码、解码的封装，接口非常简单，支持g722,g723,g728,g729的编解码,For audio encoding, decoding package, interface is very easy to support g722, g723, g728, g729 codec

PCM转g.729的源码 用vs2005编译通过-PCM to G.729 source code with VS2005 compiler through