/**
* decode given picture
*
* @param pic SubPicture object containing info about caption
* @throws CoreException
*/
private void decode(SubPictureBD pic) throws CoreException {
palette = decodePalette(pic);
bitmap = decodeImage(pic, palette.getIndexOfMostTransparentPaletteEntry());
primaryColorIndex =
bitmap.getPrimaryColorIndex(
palette.getAlpha(), configuration.getAlphaThreshold(), palette.getY());
}
/**
* 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 deadbeef.SupTools.SubtitleStream#decode(int)
*/
@Override
public void decode(int index) throws CoreException {
try {
File f = new File(subPictures.get(index).getFileName());
if (!f.exists()) {
throw new CoreException("file " + subPictures.get(index).getFileName() + " not found.");
}
BufferedImage img = ImageIO.read(f);
int w = img.getWidth();
int h = img.getHeight();
this.palette = null;
// first try to read image and palette directly from imported image
if (img.getType() == BufferedImage.TYPE_BYTE_INDEXED) {
IndexColorModel icm = (IndexColorModel) img.getColorModel();
if (icm.getMapSize() < 255 || (icm.hasAlpha() && icm.getAlpha(255) == 0)) {
// create palette
palette = new Palette(256);
for (int i = 0; i < icm.getMapSize(); i++) {
int alpha = (icm.getRGB(i) >> 24) & 0xff;
if (alpha >= configuration.getAlphaCrop()) {
palette.setARGB(i, icm.getRGB(i));
} else {
palette.setARGB(i, 0);
}
}
// copy pixels
WritableRaster raster = img.getRaster();
bitmap =
new Bitmap(
img.getWidth(),
img.getHeight(),
(byte[]) raster.getDataElements(0, 0, img.getWidth(), img.getHeight(), null));
}
}
// if this failed, assume RGB image and quantize palette
if (palette == null) {
// grab int array (ARGB)
int[] pixels = new int[w * h];
img.getRGB(0, 0, w, h, pixels, 0, w);
// quantize image
QuantizeFilter qf = new QuantizeFilter();
bitmap = new Bitmap(img.getWidth(), img.getHeight());
int ct[] = qf.quantize(pixels, bitmap.getInternalBuffer(), w, h, 255, false, false);
int size = ct.length;
if (size > 255) {
logger.warn("Quantizer failed.\n");
size = 255;
}
// create palette
palette = new Palette(256);
for (int i = 0; i < size; i++) {
int alpha = (ct[i] >> 24) & 0xff;
if (alpha >= configuration.getAlphaCrop()) {
palette.setARGB(i, ct[i]);
} else {
palette.setARGB(i, 0);
}
}
}
primaryColorIndex =
bitmap.getPrimaryColorIndex(
palette.getAlpha(), configuration.getAlphaThreshold(), palette.getY());
// crop
BitmapBounds bounds =
bitmap.getCroppingBounds(palette.getAlpha(), configuration.getAlphaCrop());
if (bounds.yMin > 0
|| bounds.xMin > 0
|| bounds.xMax < bitmap.getWidth() - 1
|| bounds.yMax < bitmap.getHeight() - 1) {
w = bounds.xMax - bounds.xMin + 1;
h = bounds.yMax - bounds.yMin + 1;
if (w < 2) {
w = 2;
}
if (h < 2) {
h = 2;
}
bitmap = bitmap.crop(bounds.xMin, bounds.yMin, w, h);
// update picture
SubPictureXml pic = subPictures.get(index);
pic.setImageWidth(w);
pic.setImageHeight(h);
pic.setOfsX(pic.getOriginalXOffset() + bounds.xMin);
pic.setOfsY(pic.getOriginalYOffset() + bounds.yMin);
}
} catch (IOException e) {
throw new CoreException(e.getMessage());
} catch (OutOfMemoryError e) {
JOptionPane.showMessageDialog(
null,
"Out of heap! Use -Xmx256m to increase heap!",
"Error!",
JOptionPane.WARNING_MESSAGE);
throw new CoreException("Out of heap! Use -Xmx256m to increase heap!");
}
}
