long commentHeaderStartPosition;
long setupHeaderStartPosition;
int commentHeaderSize = 0;
int setupHeaderSize;
//1st page = codec infos
OggPageHeader pageHeader = OggPageHeader.read(raf);
//Skip over data to end of page header 1
raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
//2nd page = comment, may extend to additional pages or not , may also have setup header
pageHeader = OggPageHeader.read(raf);
commentHeaderStartPosition = raf.getFilePointer() - (OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length);
//Now at start of packets on page 2 , check this is the vorbis comment header
byte[] b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
raf.read(b);
if (!isVorbisCommentHeader(b)) {
throw new CannotReadException("Cannot find comment block (no vorbiscomment header)");
}
raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
// //logger.fine("Found start of comment header at:" + raf.getFilePointer());
//Calculate Comment Size (not inc header)
while (true) {
List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();
commentHeaderSize += packetList.get(0).getLength();
raf.skipBytes(packetList.get(0).getLength());
//If this page contains multiple packets or if this last packet is complete then the Comment header
//end son this page and we can break
if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
//done comment size
// //logger.fine("Found end of comment:size:" + commentHeaderSize + "finishes at file position:" + raf.getFilePointer());
break;
}
pageHeader = OggPageHeader.read(raf);
}
//If there are no more packets on this page we need to go to next page to get the setup header
OggPageHeader.PacketStartAndLength packet;
if (pageHeader.getPacketList().size() == 1) {
pageHeader = OggPageHeader.read(raf);
List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();
packet = pageHeader.getPacketList().get(0);
//Now at start of next packet , check this is the vorbis setup header
b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
raf.read(b);
if (!isVorbisSetupHeader(b)) {
throw new CannotReadException(ErrorMessage.OGG_VORBIS_NO_VORBIS_HEADER_FOUND.getMsg());
}
raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
// //logger.fine("Found start of vorbis setup header at file position:" + raf.getFilePointer());
//Set this to the start of the OggPage that setupheader was found on
setupHeaderStartPosition = raf.getFilePointer() - (OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length);
//Add packet data to size to the setup header size
setupHeaderSize = packet.getLength();
// //logger.fine("Adding:" + packetList.get(1).getLength() + " to setup header size");
//Skip over the packet data
raf.skipBytes(packet.getLength());
//If there are other packets that follow this one, or if the last packet is complete then we must have
//got the size of the setup header.
if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
// logger.info("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
if (packetList.size() > 1) {
extraPackets = packetList.subList(1, packetList.size());
}
}
//The setup header continues onto the next page
else {
pageHeader = OggPageHeader.read(raf);
packetList = pageHeader.getPacketList();
while (true) {
setupHeaderSize += packetList.get(0).getLength();
// logger.fine("Adding:" + packetList.get(0).getLength() + " to setup header size");
raf.skipBytes(packetList.get(0).getLength());
if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
//done setup size
// logger.fine("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
if (packetList.size() > 1) {
extraPackets = packetList.subList(1, packetList.size());
}
break;
}
//Continues onto another page
pageHeader = OggPageHeader.read(raf);
}
}
}
//else its next packet on this page
else {
packet = pageHeader.getPacketList().get(1);
List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();
//Now at start of next packet , check this is the vorbis setup header
b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
raf.read(b);
if (!isVorbisSetupHeader(b)) {
//logger.warning("Expecting but got:" + new String(b) + "at " + (raf.getFilePointer() - b.length));
throw new CannotReadException(ErrorMessage.OGG_VORBIS_NO_VORBIS_HEADER_FOUND.getMsg());
}
raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
// logger.info("Found start of vorbis setup header at file position:" + raf.getFilePointer());
//Set this to the start of the OggPage that setupheader was found on
setupHeaderStartPosition = raf.getFilePointer() - (OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length)
- pageHeader.getPacketList().get(0).getLength();
//Add packet data to size to the setup header size
setupHeaderSize = packet.getLength();
// logger.fine("Adding:" + packet.getLength() + " to setup header size");
//Skip over the packet data
raf.skipBytes(packet.getLength());
//If there are other packets that follow this one, or if the last packet is complete then we must have
//got the size of the setup header.
if (packetList.size() > 2 || !pageHeader.isLastPacketIncomplete()) {
// logger.fine("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
if (packetList.size() > 2) {
extraPackets = packetList.subList(2, packetList.size());
}
}
//The setup header continues onto the next page
else {
pageHeader = OggPageHeader.read(raf);
packetList = pageHeader.getPacketList();
while (true) {
setupHeaderSize += packetList.get(0).getLength();
// logger.fine("Adding:" + packetList.get(0).getLength() + " to setup header size");
raf.skipBytes(packetList.get(0).getLength());
if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
//done setup size
// logger.fine("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
if (packetList.size() > 1) {
extraPackets = packetList.subList(1, packetList.size());
}