xjmac-codec

Just a bit change from JMAC library version 1.7.4

This project was copied from jmac project, the original project site was: http://jmac.sourceforge.net/

I need the jmac work together with java sound api, but the original project seems not be updated for a long time, so I copied this project.

I copied this project just for my own purposes, but I had no knowledge about APE codec nor java sound api, so this project is most likely not updated, please don't depends on this project, thanks!

changes

1. change package path to win.zqxu.xjmac
2. all source code file re-formatted
3. change compile warning code, using Java 8 generic style
4. removed native code
5. add frame length support to get music duration

sample code

  public static void main(String[] args) throws Exception {
    File file = new File("test.ape");
    // determine music duration using AudioFileFormat
    AudioFileFormat fileFormat = AudioSystem.getAudioFileFormat(file);
    outputDuration("duration from AudioFileFormat: ",
        fileFormat.getFormat(), fileFormat.getFrameLength());
    try (AudioInputStream audioStream = AudioSystem.getAudioInputStream(file)) {
      // determine music duration using original AudioFileFormat
      outputDuration("duration from original AudioFormat: ",
          audioStream.getFormat(), audioStream.getFrameLength());
      int channels = audioStream.getFormat().getChannels();
      float rate = audioStream.getFormat().getSampleRate();
      AudioFormat playFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
          rate, 16, channels, channels * 2, rate, false);
      DataLine.Info lineInfo = new DataLine.Info(SourceDataLine.class, playFormat);
      SourceDataLine audioLine = (SourceDataLine) AudioSystem.getLine(lineInfo);
      AudioInputStream playStream = AudioSystem.getAudioInputStream(playFormat, audioStream);
      // determine music duration using converted AudioFileFormat
      outputDuration("duration from converted AudioFormat: ",
          playStream.getFormat(), playStream.getFrameLength());
      // skip thirty seconds
      byte[] buffer = new byte[65536];
      float bytesPerSecond = playFormat.getFrameSize() * playFormat.getFrameRate();
      int bytesRead = 0, bytesToSkip = (int) (bytesPerSecond * 30);
      while (bytesToSkip > 0 && bytesRead != -1) {
        bytesToSkip -= bytesRead = (int) playStream.read(buffer);
      }
      // Start play
      audioLine.open();
      audioLine.start();
      while ((bytesRead = playStream.read(buffer)) != -1) {
        audioLine.write(buffer, 0, bytesRead);
      }
      // Waiting for play to complete
      audioLine.drain();
      audioLine.close();
    }
  }

  private static void outputDuration(String message,
      AudioFormat format, long frameLength) {
    float bytesPerSecond = format.getFrameSize() * format.getFrameRate();
    System.out.println(message + (int) (frameLength / bytesPerSecond));
  }