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

TarsosDSP的GitHub地址：https://github.com/JorenSix/T...。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) {// 这里根据自己PCM格式修改对应参数。我们项目里音频格式是固定的，所以写死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;}@Overridepublic boolean process(AudioEvent audioEvent) {bos.write(audioEvent.getByteBuffer(),0,audioEvent.getByteBuffer().length);return true;}@Overridepublic 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 {// 这里根据自己PCM格式修改对应参数。我们项目里音频格式是固定的，所以写死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();}