AAC音频编码
https://www.jianshu.com/p/af0165f923e9
https://blog.csdn.net/u013427969/article/details/53091594
https://blog.csdn.net/qinglongzhan/article/details/80972174
时域频域的介绍（傅里叶变换）：https://blog.csdn.net/u013539952/article/details/80525393
心理声学：
RTMP应用层协议
https://blog.csdn.net/qq_34447388/article/details/78995606
https://blog.csdn.net/leixiaohua1020/article/details/11694129
https://blog.csdn.net/leixiaohua1020/article/details/15814587