实现安卓录音,添加背景音乐,并对二者进行混音处理.-Realize the android recording, add background music, and carries on the mixing process.

实现了android音乐均衡器、混响、混音功能(Android music equalizer, reverb and mixing functions are realized)

音频混合：实时录制audio时录制麦克风数据 和 写入背景音乐 本次案例实现了 ＊MediaPlayer 播放音频 ＊AudioTrack 播放音频 mp3 --> pcm data ( libs/jl1.0.1.jar ) ＊AudioRecord 录制音频 pcm file ＊AudioTrack 播放音频 pcm data ＊AudioRecord 录制音频 use MediaCodec & MediaMuxer write data ＊MediaExtract