1、下载fdk-aac
https://github.com/mstorsjo/fdk-aac
2、需要安装automake libtool,运行:brew install automake libtool
3、下载build脚本
https://github.com/kewlbear/fdk-aac-build-script-for-iOS
4、将fdk-aac拷贝到build脚本目录下,并重命名为fdk-aac-0.1.5,在fdk-aac-0.1.5目录下运行:autogen.sh
回到上一层目录,运行:build-fdk-aac.sh lipo