在linux系统下安装eclipse，并导入NDK编译器，编写android.mk脚本文件。把ffmpeg移植到android，通过JNI为上层java提供接口-In the Linux system under eclipse installed, and import NDK compiler, compiling a android.mk scr ipt file. Porting ffmpeg to Android, through the JNI for the java interf

读取并解析AAC文件，AAC音频格式分析(Reading and parsing AAC files, AAC audio format analysis)