Code Analysis in JAVA, javapcm

Code Analysis in JAVA, javapcm

TheAudio Data of PCM voice changes. After struggling for a week, I finally found a framework implemented in pure Java-TarsosDSP. Very powerful! Real-time audio processing! Of course, I only used to process files. Actually, the logic is the same.

GitHub address for TarsosDSP: The https://github.com/JorenSix/TarsosDSP integrates it into its own project.

Java tool code:

/*** Voice change ** @ param rawPcmInputStream raw PCM data input stream * @ param speedFactor variable speed () greater than 1 to speed up the speech, if the value is less than 1, it indicates a slow speech rate * @ param rateFactor. The tone change rate () is greater than 1. If the value is less than 1, it indicates a lowering tone (deep). If the value is less than 1, it indicates an ascending tone (sharp) * @ return: the PCM data input stream after the change */public static InputStream speechPitchShift (final InputStream rawPcmInputStream, double speedFactor, double rateFactor) {TarsosDSPAudioFormat = new partition (, 16, 1, true, false); AudioInputStream inputStream = new AudioInputStream (rawPcmInputStream, JVMAudioInputStream. toAudioFormat (format), AudioSystem. NOT_SPECIFIED); JVMAudioInputStream stream = new JVMAudioInputStream (inputStream); WaveformSimilarityBasedOverlapAdd w = new WaveformSimilarityBasedOverlapAdd (signature. 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 ());}

The code of the Data Recorder (AudioOutputToByteArray) is as follows:

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;  }}

You can use this tool to play the audio:

/*** Play PCM **. Do not call it in a non-desktop environment... Ghost knows what will happen * @ param rawPcmInputStream raw PCM data input stream * @ throws LineUnavailableException */public static void play (final InputStream rawPcmInputStream) throws LineUnavailableException {partition format = new partition (, 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 ();}