用DirectSound实现了音频的采集与播放，采用Speex算法压缩与解压缩音频数据，但还没有加上网络通讯层，所以不能作为商业代码来用，只能适合初学者自学（vs2005编译通过）-Use DirectSound audio capture and playback, Speex algorithm for compression and decompression of audio data, but have not yet coupled with the network communic