Esempio n. 1
0
  /**
   * decode palette from the input stream
   *
   * @param pic SubPicture object containing info about the current caption
   * @return
   * @throws CoreException
   */
  private Palette decodePalette(SubPictureBD pic) throws CoreException {
    boolean fadeOut = false;
    int paletteIndex;
    List<PaletteInfo> paletteInfos = pic.getPalettes().get(pic.getImageObject().getPaletteID());
    if (paletteInfos == null) {
      throw new CoreException("Palette ID out of bounds.");
    }

    Palette palette = new Palette(256, Core.usesBT601());
    // by definition, index 0xff is always completely transparent
    // also all entries must be fully transparent after initialization

    try {
      for (PaletteInfo paletteInfo : paletteInfos) {
        int index = paletteInfo.getPaletteOffset();
        for (int i = 0; i < paletteInfo.getPaletteSize(); i++) {
          // each palette entry consists of 5 bytes
          paletteIndex = buffer.getByte(index);
          int y = buffer.getByte(++index);
          int cr, cb;
          if (configuration.isSwapCrCb()) {
            cb = buffer.getByte(++index);
            cr = buffer.getByte(++index);
          } else {
            cr = buffer.getByte(++index);
            cb = buffer.getByte(++index);
          }
          int alpha = buffer.getByte(++index);

          int alphaOld = palette.getAlpha(paletteIndex);
          // avoid fading out
          if (alpha >= alphaOld) {
            if (alpha
                < configuration
                    .getAlphaCrop()) { // to not mess with scaling algorithms, make transparent
                                       // color black
              y = 16;
              cr = 128;
              cb = 128;
            }
            palette.setAlpha(paletteIndex, alpha);
          } else {
            fadeOut = true;
          }

          palette.setYCbCr(paletteIndex, y, cb, cr);
          index++;
        }
      }
      if (fadeOut) {
        logger.warn("fade out detected -> patched palette\n");
      }
      return palette;
    } catch (FileBufferException ex) {
      throw new CoreException(ex.getMessage());
    }
  }
Esempio n. 2
0
 /* (non-Javadoc)
  * @see SubtitleStream#close()
  */
 public void close() {
   if (buffer != null) {
     buffer.close();
   }
 }