项目中需要用到对PCM人声音频数据进行变声处理。苦苦挣扎了一周终于找到了纯Java实现的一套框架——TarsosDSP。功能非常强大！可以实时音频处理！当然我只用到了对文件处理。实际上逻辑是一样的
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TarsosDSP的GitHub地址：https://github.com/JorenSix/TarsosDSP 将它整合至自己的项目工程。
具体Java工具类代码：
/**
* 变声
* @param rawPcmInputStream 原始PCM数据输入流
* @param speedFactor 变速率 (0,2) 大于1为加快语速，小于1为放慢语速
* @param rateFactor 音调变化率 (0,2) 大于1为降低音调（深沉），小于1为提升音调（尖锐）
* @return 变声后的PCM数据输入流
*/
public static InputStream speechPitchShift(final InputStream rawPcmInputStream,double speedFactor,double rateFactor) {
TarsosDSPAudioFormat format = new TarsosDSPAudioFormat(16000,16,1,true,false);
AudioInputStream inputStream = new AudioInputStream(rawPcmInputStream, JVMAudioInputStream.toAudioFormat(format),AudioSystem.NOT_SPECIFIED);
JVMAudioInputStream stream = new JVMAudioInputStream(inputStream);
WaveformSimilarityBasedOverlapAdd w = new WaveformSimilarityBasedOverlapAdd(WaveformSimilarityBasedOverlapAdd.Parameters.speechDefaults(speedFactor, 16000));
int inputBufferSize = w.getInputBufferSize();
int overlap = w.getOverlap();
AudioDispatcher dispatcher = new AudioDispatcher(stream, inputBufferSize ,overlap);
w.setDispatcher(dispatcher);
AudioOutputToByteArray out = new AudioOutputToByteArray();
dispatcher.addAudioProcessor(w);
dispatcher.addAudioProcessor(new RateTransposer(rateFactor));
dispatcher.addAudioProcessor(out);
dispatcher.run();
return new ByteArrayInputStream(out.getData());
}其中数据转录器(AudioOutputToByteArray)代码如下：
public class AudioOutputToByteArray implements AudioProcessor {
private boolean isDone = false;
private byte[] out = null;
private ByteArrayOutputStream bos;
public AudioOutputToByteArray() {
bos = new ByteArrayOutputStream();
}
public byte[] getData() {
while (!isDone && out == null) {
try {
Thread.sleep(10);
} catch (InterruptedException ignored) {}
}
return out;
}
@Override
public boolean process(AudioEvent audioEvent) {
bos.write(audioEvent.getByteBuffer(),0,audioEvent.getByteBuffer().length);
return true;
}
@Override
public void processingFinished() {
out = bos.toByteArray().clone();
bos = null;
isDone = true;
}
}可以通过这个工具方法播放音频：
/**
* 播放PCM
*
* 不要在非桌面环境调用。。。鬼知道会发生什么
* @param rawPcmInputStream 原始PCM数据输入流
* @throws LineUnavailableException
*/
public static void play(final InputStream rawPcmInputStream) throws LineUnavailableException {
TarsosDSPAudioFormat format = new TarsosDSPAudioFormat(16000,16,1,true,false);
AudioInputStream inputStream = new AudioInputStream(rawPcmInputStream, JVMAudioInputStream.toAudioFormat(format),AudioSystem.NOT_SPECIFIED);
JVMAudioInputStream stream = new JVMAudioInputStream(inputStream);
AudioDispatcher dispatcher = new AudioDispatcher(stream, 1024 ,0);
dispatcher.addAudioProcessor(new AudioPlayer(format,1024));
dispatcher.run();
}
