/**
* 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());
}
}
@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) {
state = findState(qName);
String at;
if (state != XmlState.BDN && !valid) {
logger.error("BDN tag missing");
}
txt = null;
switch (state) {
case UNKNOWN:
logger.error("Unknown tag " + qName + "\n");
break;
case BDN:
if (valid) {
logger.error("BDN must be used only once");
} else {
valid = true;
}
break;
case NAME:
at = atts.getValue("Title");
if (at != null) {
title = at;
logger.trace("Title: " + title + "\n");
}
break;
case LANGUAGE:
at = atts.getValue("Code");
if (at != null) {
language = at;
logger.trace("Language: " + language + "\n");
}
break;
case FORMAT:
at = atts.getValue("FrameRate");
if (at != null) {
fps = SubtitleUtils.getFps(at);
fpsXml = XmlFps(fps);
logger.trace("fps: " + ToolBox.formatDouble(fps) + "\n");
}
at = atts.getValue("VideoFormat");
if (at != null) {
String res = at;
for (Resolution r : Resolution.values()) {
if (res.length() == 4
&& res.charAt(0) != '7') { // hack to rename 480p/576p to 480i/576i
res = res.replace('p', 'i');
}
if (r.getResolutionNameForXml().equalsIgnoreCase(res)) {
resolution = r;
logger.trace("Language: " + r.getResolutionNameForXml() + "\n");
break;
}
}
}
break;
case EVENTS:
at = atts.getValue("NumberofEvents");
if (at != null) {
int n = ToolBox.getInt(at);
if (n > 0) {
/* number of subtitles read from the xml */
Core.setProgressMax(n);
}
}
break;
case EVENT:
pic = new SubPictureXml();
subPictures.add(pic);
int num = subPictures.size();
logger.info("#" + num + "\n");
Core.setProgress(num);
at = atts.getValue("InTC");
if (at != null) {
pic.setStartTime(timeStrXmlToPTS(at, fpsXml));
if (pic.getStartTime() == -1) {
pic.setStartTime(0);
logger.warn("Invalid start time " + at + "\n");
}
}
at = atts.getValue("OutTC");
if (at != null) {
pic.setEndTime(timeStrXmlToPTS(at, fpsXml));
if (pic.getEndTime() == -1) {
pic.setEndTime(0);
logger.warn("Invalid end time " + at + "\n");
}
}
if (fps != fpsXml) {
pic.setStartTime((pic.getStartTime() * 1001 + 500) / 1000);
pic.setEndTime((pic.getEndTime() * 1001 + 500) / 1000);
}
at = atts.getValue("Forced");
pic.setForced(at != null && at.equalsIgnoreCase("true"));
if (pic.isForced()) {
numForcedFrames++;
}
int dim[] = resolution.getDimensions();
pic.setWidth(dim[0]);
pic.setHeight(dim[1]);
break;
case GRAPHIC:
pic.setImageWidth(ToolBox.getInt(atts.getValue("Width")));
pic.setImageHeight(ToolBox.getInt(atts.getValue("Height")));
pic.setOfsX(ToolBox.getInt(atts.getValue("X")));
pic.setOfsY(ToolBox.getInt(atts.getValue("Y")));
pic.storeOriginalOffsets();
txt = new StringBuffer();
break;
}
}