/** * 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()); } }
/* (non-Javadoc) * @see SubtitleStream#close() */ public void close() { if (buffer != null) { buffer.close(); } }