/**
* Return the size required by all the extra packets on same page as setup header, usually there
* are no packets immediately after the setup packet.
*
* @return extra data size required for additional packets on same page
*/
public int getExtraPacketDataSize() {
int extraPacketSize = 0;
for (OggPageHeader.PacketStartAndLength packet : packetList) {
extraPacketSize += packet.getLength();
}
return extraPacketSize;
}
/**
* Calculate the size of the packet data for the comment and setup headers
*
* @param raf
* @return
* @throws CannotReadException
* @throws IOException
*/
public OggVorbisHeaderSizes readOggVorbisHeaderSizes(RandomAccessFile raf)
throws CannotReadException, IOException {
// //logger.fine("Started to read comment and setup header sizes:");
// Stores filepointers so return file in same state
long filepointer = raf.getFilePointer();
// Extra Packets on same page as setup header
List<OggPageHeader.PacketStartAndLength> extraPackets =
new ArrayList<OggPageHeader.PacketStartAndLength>();
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());
}
break;
}
// Continues onto another page
pageHeader = OggPageHeader.read(raf);
}
}
}
// Reset filepointer to location that it was in at start of method
raf.seek(filepointer);
return new OggVorbisHeaderSizes(
commentHeaderStartPosition,
setupHeaderStartPosition,
commentHeaderSize,
setupHeaderSize,
extraPackets);
}