这是一个 Android 端万能音频播放器，只要给我一个路径我就能进行播放。
主要是对市面上所有的音频的播放，不限于音频格式。
对音频数据流的操作，比如裁剪，变声等。
更多介绍请移步博客详解 音视频学习 (十二) 基于 FFmpeg + OpenSLES 实现音频万能播放器
功能点介绍:
| 功能点 | 是否完成 |
|---|---|
| 读取任意格式音频流 | Yes |
| FFMPEG 音频解码为 PCM | Yes |
| 音频 Native OpenSL ES渲染 | Yes |
| 音频音量控制 | Yes |
| 拖动播放控制 | Yes |
| 声道切换 | Yes |
| 变调变速 | Yes |
| 变声 | |
| 裁剪音频输出 PCM/MP3 等格式 | Yes |
| 边播边录制 | |
| 音频编码为 AAC、MP3(OK)、WAV | |
一开始avformat_open_input本地路径的音频文件总是返回-13的错误，AndroidManifest.xml中也是有读写权限，后来在节点增加 android:requestLegacyExternalStorage="true" 后不再返回-13，但是运行后点开始播放后崩溃，如下为崩溃信息:
fatal error: '../lame/libmp3lame/lame.h' file not found
#include "../lame/libmp3lame/lame.h"
少了lame相关的源文件，无法运行。
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