if (op.isEos()){
eos = true;
lastPage = op;
}
LogicalOggStreamImpl los = (LogicalOggStreamImpl) logicalStreams.get(op.getStreamSerialNumber());
if(los == null) {
los = new LogicalOggStreamImpl(this, op.getStreamSerialNumber());
logicalStreams.put(op.getStreamSerialNumber(), los);
los.checkFormat(op);
}
los.addPageNumberMapping(pageNumber);
los.addGranulePosition(op.getAbsoluteGranulePosition());
oggPages.put(pageNumber, op);
pageNumber++;
return pageNumber-1;