1. http://www.cocoachina.com/bbs/read.php?tid=114755
2, http://blog.csdn.net/jiangyiaxiu/article/details/9191013
3, http://blog.csdn.net/shenjie12345678/article/details/39934673
4, http://blog.csdn.net/shenjie12345678/article/details/40108817
5, http://blog.csdn.net/DotScylla/article/details/4402688
6, record speex