Advanced Linux Sound Architecture reference: https://www.alsa-project.org/wiki/Main_Page https://blog.csdn.net/droidphone/category_1118446.html https://blog.csdn.net/guet_kite/category_10314173.html https://blog.csdn.net/azloong/category_778492.html https://www.cnblogs.com/fellow1988/tag/ALSA/
