整理自 自https://github.com/VladimirKulyk/SoundTouch-Android.git 原项目太老跑不动 ，后续改为cmake,不然开发体验太差
soundTouch的使用方法:
//There are currently 16 track id's you can use (0-15), each one has a separate SoundTouch processor.
//Set your audio processing requirements: track id, channels, samplingRate, bytesPerSample,
// tempoChange (1.0 is normal speed), pitchChange (in semi-tones)
SoundTouch soundTouch = new SoundTouch(0, 2, 44100, 2, 1.0f, 2.0f);
//byte[] sizes are recommended to be 8192 bytes.
//put a byte[] of PCM audio in the sound processor:
soundTouch.putBytes(input);
//write output to a byte[]:
int bytesReceived = soundTouch.getBytes(output);
//after you write the last byte[], call finish().
soundTouch.finish();
//now get the remaining bytes from the sound processor.
int bytesReceived = 0;
do
{
bytesReceived = soundTouch.getBytes(output);
//do stuff with output.
} while (bytesReceived != 0)
//if you stop playing, call clear on the track to clear the pipeline for later use.
soundTouch.clearBuffer()SoundStreamAudioPlayer.java 是一个支持可变速变调播放音频的播放器，基于MediaCodec做音轨解码，其使用方法如下：
//The last two parameters are speed of playback (1.0 is 100% of original speed) and pitch adjustment in semi-tones.
SoundStreamAudioPlayer player = new SoundStreamAudioPlayer(0, f.getPath(), 1.0f, 1.0f);
new Thread(player).start();
player.start();结束播放时，应调用stop释放资源：
st.pause();
st.stop();音频变速变调的另外一种思路是，对音频文件通过soundTouch处理后，重新编码为aac文件，任何播放器可以播放这个文件：
SoundStreamFileWriter writer = new SoundStreamFileWriter(0, fileNameIn, fileNameOut, tempo, pitch);
new Thread(writer).start();
writer.start();