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/TarsosDSP 将它整合至自己的项目工程。
具体Java工具类代码：
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/** * 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：
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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：
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/** * 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();} |
原文链接：https://segmentfault.com/a/1190000012834216
