private Map<String, TtmlStyle> parseHeader(
XmlPullParser xmlParser, Map<String, TtmlStyle> globalStyles)
throws IOException, XmlPullParserException {
do {
xmlParser.next();
if (ParserUtil.isStartTag(xmlParser, TtmlNode.TAG_STYLE)) {
String parentStyleId = xmlParser.getAttributeValue(null, ATTR_STYLE);
TtmlStyle style = parseStyleAttributes(xmlParser, new TtmlStyle());
if (parentStyleId != null) {
String[] ids = parseStyleIds(parentStyleId);
for (int i = 0; i < ids.length; i++) {
style.chain(globalStyles.get(ids[i]));
}
}
if (style.getId() != null) {
globalStyles.put(style.getId(), style);
}
}
} while (!ParserUtil.isEndTag(xmlParser, TtmlNode.TAG_HEAD));
return globalStyles;
}
private TtmlNode parseNode(XmlPullParser parser, TtmlNode parent) throws ParserException {
long duration = 0;
long startTime = TtmlNode.UNDEFINED_TIME;
long endTime = TtmlNode.UNDEFINED_TIME;
String[] styleIds = null;
int attributeCount = parser.getAttributeCount();
TtmlStyle style = parseStyleAttributes(parser, null);
for (int i = 0; i < attributeCount; i++) {
String attr = ParserUtil.removeNamespacePrefix(parser.getAttributeName(i));
String value = parser.getAttributeValue(i);
if (attr.equals(ATTR_BEGIN)) {
startTime =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_END)) {
endTime =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_DURATION)) {
duration =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_STYLE)) {
// IDREFS: potentially multiple space delimited ids
String[] ids = parseStyleIds(value);
if (ids.length > 0) {
styleIds = ids;
}
} else {
// Do nothing.
}
}
if (parent != null && parent.startTimeUs != TtmlNode.UNDEFINED_TIME) {
if (startTime != TtmlNode.UNDEFINED_TIME) {
startTime += parent.startTimeUs;
}
if (endTime != TtmlNode.UNDEFINED_TIME) {
endTime += parent.startTimeUs;
}
}
if (endTime == TtmlNode.UNDEFINED_TIME) {
if (duration > 0) {
// Infer the end time from the duration.
endTime = startTime + duration;
} else if (parent != null && parent.endTimeUs != TtmlNode.UNDEFINED_TIME) {
// If the end time remains unspecified, then it should be inherited from the parent.
endTime = parent.endTimeUs;
}
}
return TtmlNode.buildNode(parser.getName(), startTime, endTime, style, styleIds);
}
private TtmlStyle parseStyleAttributes(XmlPullParser parser, TtmlStyle style) {
int attributeCount = parser.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
String attributeName = parser.getAttributeName(i);
String attributeValue = parser.getAttributeValue(i);
switch (ParserUtil.removeNamespacePrefix(attributeName)) {
case TtmlNode.ATTR_ID:
if (TtmlNode.TAG_STYLE.equals(parser.getName())) {
style = createIfNull(style).setId(attributeValue);
}
break;
case TtmlNode.ATTR_TTS_BACKGROUND_COLOR:
style = createIfNull(style);
try {
style.setBackgroundColor(TtmlColorParser.parseColor(attributeValue));
} catch (IllegalArgumentException e) {
Log.w(TAG, "failed parsing background value: '" + attributeValue + "'");
}
break;
case TtmlNode.ATTR_TTS_COLOR:
style = createIfNull(style);
try {
style.setColor(TtmlColorParser.parseColor(attributeValue));
} catch (IllegalArgumentException e) {
Log.w(TAG, "failed parsing color value: '" + attributeValue + "'");
}
break;
case TtmlNode.ATTR_TTS_FONT_FAMILY:
style = createIfNull(style).setFontFamily(attributeValue);
break;
case TtmlNode.ATTR_TTS_FONT_SIZE:
// TODO: handle size
break;
case TtmlNode.ATTR_TTS_FONT_WEIGHT:
style = createIfNull(style).setBold(TtmlNode.BOLD.equalsIgnoreCase(attributeValue));
break;
case TtmlNode.ATTR_TTS_FONT_STYLE:
style = createIfNull(style).setItalic(TtmlNode.ITALIC.equalsIgnoreCase(attributeValue));
break;
case TtmlNode.ATTR_TTS_TEXT_ALIGN:
switch (Util.toLowerInvariant(attributeValue)) {
case TtmlNode.LEFT:
style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_NORMAL);
break;
case TtmlNode.START:
style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_NORMAL);
break;
case TtmlNode.RIGHT:
style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_OPPOSITE);
break;
case TtmlNode.END:
style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_OPPOSITE);
break;
case TtmlNode.CENTER:
style = createIfNull(style).setTextAlign(Layout.Alignment.ALIGN_CENTER);
break;
}
break;
case TtmlNode.ATTR_TTS_TEXT_DECORATION:
switch (Util.toLowerInvariant(attributeValue)) {
case TtmlNode.LINETHROUGH:
style = createIfNull(style).setLinethrough(true);
break;
case TtmlNode.NO_LINETHROUGH:
style = createIfNull(style).setLinethrough(false);
break;
case TtmlNode.UNDERLINE:
style = createIfNull(style).setUnderline(true);
break;
case TtmlNode.NO_UNDERLINE:
style = createIfNull(style).setUnderline(false);
break;
}
break;
default:
// ignore
break;
}
}
return style;
}