sdl 音频最简
https://blog.csdn.net/leixiaohua1020/article/details/40544521?utm_medium=distribute.pc_relevant.none-task-blog-OPENSEARCH-2.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-OPENSEARCH-2.control
里面有地址
http://www.samirchen.com/ffmpeg-tutorial-3/