private ByteVectorCollection currentPackets; //! The packets for the currentPacketPage -- used by packet()
#endregion
#region Private Methods
private bool NextPage()
{
long next_page_offset;
int current_packet;
if (pages.Count == 0)
{
current_packet = 0;
next_page_offset = Find("OggS");
if (next_page_offset < 0)
return false;
}
else
{
if (currentPage.Header.LastPageOfStream)
return false;
if (currentPage.Header.LastPacketCompleted)
current_packet = (int)(currentPage.FirstPacketIndex + currentPage.PacketCount);
else
current_packet = (int)(currentPage.FirstPacketIndex + currentPage.PacketCount - 1);
next_page_offset = currentPage.FileOffset + currentPage.Size;
}
// Read the next page and add it to the page text.
currentPage = new OggPage(this, next_page_offset);
if (!currentPage.Header.IsValid)
{
currentPage = null;
return false;
}
currentPage.FirstPacketIndex = current_packet;
if (pages.Count == 0)
streamSerialNumber = currentPage.Header.StreamSerialNumber;
pages.Add(currentPage);
// Loop through the packets in the page that we just read appending the
// current page number to the packet to page map for each packet.
for (int i = 0; i < currentPage.PacketCount; i++)
{
current_packet = currentPage.FirstPacketIndex + i;
if (packetToPageMap.Count <= current_packet)
packetToPageMap.Add(new IntCollection());
((IntCollection)packetToPageMap[current_packet]).Add(pages.Count - 1);
}
return true;
}
protected void ClearPageData()
{
streamSerialNumber = 0;
pages = new List <OggPage>(); //new ArrayList ();
firstPageHeader = null;
lastPageHeader = null;
packetToPageMap = new List <IntCollection>(); //new ArrayList();
dirtyPackets = new Dictionary <uint, ByteVector>(); //new Hashtable ();
dirtyPages = new IntCollection();
currentPage = null;
currentPacketPage = null;
currentPackets = null;
}
private ByteVectorCollection currentPackets; //! The packets for the currentPacketPage -- used by packet()
#endregion
#region Private Methods
private bool NextPage()
{
long next_page_offset;
int current_packet;
if (pages.Count == 0)
{
current_packet = 0;
next_page_offset = Find("OggS");
if (next_page_offset < 0)
{
return(false);
}
}
else
{
if (currentPage.Header.LastPageOfStream)
{
return(false);
}
if (currentPage.Header.LastPacketCompleted)
{
current_packet = (int)(currentPage.FirstPacketIndex + currentPage.PacketCount);
}
else
{
current_packet = (int)(currentPage.FirstPacketIndex + currentPage.PacketCount - 1);
}
next_page_offset = currentPage.FileOffset + currentPage.Size;
}
// Read the next page and add it to the page text.
currentPage = new OggPage(this, next_page_offset);
if (!currentPage.Header.IsValid)
{
currentPage = null;
return(false);
}
currentPage.FirstPacketIndex = current_packet;
if (pages.Count == 0)
{
streamSerialNumber = currentPage.Header.StreamSerialNumber;
}
pages.Add(currentPage);
// Loop through the packets in the page that we just read appending the
// current page number to the packet to page map for each packet.
for (int i = 0; i < currentPage.PacketCount; i++)
{
current_packet = currentPage.FirstPacketIndex + i;
if (packetToPageMap.Count <= current_packet)
{
packetToPageMap.Add(new IntCollection());
}
((IntCollection)packetToPageMap[current_packet]).Add(pages.Count - 1);
}
return(true);
}
public ByteVector GetPacket(uint index)
{
// Check to see if we're called setPacket() for this packet since the last
// save:
if (dirtyPackets.ContainsKey(index))
{
return(dirtyPackets[index]);
}
// If we haven'type indexed the page where the packet we're interested in starts,
// begin reading pages until we have.
while (packetToPageMap.Count <= index)
{
if (!NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return(null);
}
}
// Start reading at the first page that contains part (or all) of this packet.
// If the last read stopped at the packet that we're interested in, don'type
// reread its packet text. (This should make sequential packet reads fast.)
int pageIndex = ((IntCollection)packetToPageMap[(int)index])[0];
if (currentPacketPage != pages[pageIndex])
{
currentPacketPage = pages[pageIndex];
currentPackets = currentPacketPage.Packets;
}
// If the packet is completely contained in the first page that it'field in, then
// just return it now.
if ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.CompletePacket) != 0)
{
return(currentPackets[(int)(index - currentPacketPage.FirstPacketIndex)]);
}
// If the packet is *not* completely contained in the first page that it'field a
// part of then that packet trails off the end of the page. Continue appending
// the pages' packet data until we hit a page that either does not end with the
// packet that we're fetching or where the last packet is complete.
ByteVector packet = currentPackets[currentPackets.Count - 1];
while ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.EndsWithPacket) != 0 &&
!currentPacketPage.Header.LastPacketCompleted)
{
pageIndex++;
if (pageIndex == pages.Count && !NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return(null);
}
currentPacketPage = (OggPage)pages[pageIndex];
currentPackets = currentPacketPage.Packets;
packet.Add(currentPackets[0]);
}
return(packet);
}
private void WritePageGroup(IntCollection page_group)
{
if (page_group.IsEmpty)
{
return;
}
ByteVectorCollection packets = new ByteVectorCollection();
// If the first page of the group isn'type dirty, append its partial content here.
if (!dirtyPages.Contains(((OggPage)this.pages[page_group[0]]).FirstPacketIndex))
{
packets.Add(((OggPage)this.pages[page_group[0]]).Packets[0]);
}
int previous_packet = -1;
int original_size = 0;
for (int i = 0; i < page_group.Count; i++)
{
int page = page_group[i];
uint first_packet = (uint)((OggPage)this.pages[page]).FirstPacketIndex;
uint last_packet = first_packet + ((OggPage)this.pages[page]).PacketCount - 1;
for (uint j = first_packet; j <= last_packet; j++)
{
if (i == page_group.Count - 1 && j == last_packet && !dirtyPages.Contains((int)j))
{
packets.Add(((OggPage)this.pages[page]).Packets[((OggPage)this.pages[page]).Packets.Count - 1]);
}
else if ((int)j != previous_packet)
{
previous_packet = (int)j;
packets.Add(GetPacket(j));
}
}
original_size += ((OggPage)this.pages[page]).Size;
}
bool continued = ((OggPage)this.pages[page_group[0]]).Header.FirstPacketContinued;
bool completed = ((OggPage)this.pages[page_group[page_group.Count - 1]]).Header.LastPacketCompleted;
// TODO: This pagination method isn'type accurate for what'field being done here.
// This should account for real possibilities like non-aligned packets and such.
OggPage[] pages = OggPage.Paginate(packets, PaginationStrategy.SinglePagePerGroup,
streamSerialNumber, page_group[0],
continued, completed);
ByteVector data = new ByteVector();
foreach (OggPage p in pages)
{
data.Add(p.Render());
}
// The insertion algorithms could also be improve to queue and prioritize data
// on the way out. Currently it requires rewriting the file for every page
// group rather than just once; however, for tagging applications there will
// generally only be one page group, so it'field not worth the time for the
// optimization at the moment.
Insert(data, ((OggPage)this.pages[page_group[0]]).FileOffset, original_size);
// Update the page index to include the pages we just created and to delete the
// old pages.
foreach (OggPage p in pages)
{
int index = p.Header.PageSequenceNumber;
this.pages[index] = p;
}
}
public static OggPage[] Paginate(ByteVectorCollection packets, PaginationStrategy strategy, uint streamSerialNumber,
int firstPage, bool firstPacketContinued, bool lastPacketCompleted, bool containsLastPacket)
{
ArrayList l = new ArrayList();
int totalSize = 0;
foreach (ByteVector b in packets)
totalSize += b.Count;
if (strategy == PaginationStrategy.Repaginate || totalSize + packets.Count > 255 * 256)
{
TagLibDebugger.Debug ("Ogg.Page.Paginate() -- Sorry! Repagination is not yet implemented.");
return (OggPage[]) l.ToArray(typeof(OggPage));
}
// TODO: Handle creation of multiple pages here with appropriate pagination.
OggPage p = new OggPage(packets, streamSerialNumber, firstPage, firstPacketContinued,
lastPacketCompleted, containsLastPacket);
l.Add (p);
return (OggPage[]) l.ToArray(typeof(OggPage));
}
public ByteVector GetPacket(uint index)
{
// Check to see if we're called setPacket() for this packet since the last
// save:
if (dirtyPackets.ContainsKey(index))
return dirtyPackets[index];
// If we haven'type indexed the page where the packet we're interested in starts,
// begin reading pages until we have.
while (packetToPageMap.Count <= index)
if (!NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return null;
}
// Start reading at the first page that contains part (or all) of this packet.
// If the last read stopped at the packet that we're interested in, don'type
// reread its packet text. (This should make sequential packet reads fast.)
int pageIndex = ((IntCollection)packetToPageMap[(int)index])[0];
if (currentPacketPage != pages[pageIndex])
{
currentPacketPage = pages[pageIndex];
currentPackets = currentPacketPage.Packets;
}
// If the packet is completely contained in the first page that it'field in, then
// just return it now.
if ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.CompletePacket) != 0)
return currentPackets[(int)(index - currentPacketPage.FirstPacketIndex)];
// If the packet is *not* completely contained in the first page that it'field a
// part of then that packet trails off the end of the page. Continue appending
// the pages' packet data until we hit a page that either does not end with the
// packet that we're fetching or where the last packet is complete.
ByteVector packet = currentPackets[currentPackets.Count - 1];
while ((currentPacketPage.ContainsPacket((int)index) & ContainsPacketSettings.EndsWithPacket) != 0
&& !currentPacketPage.Header.LastPacketCompleted)
{
pageIndex++;
if (pageIndex == pages.Count && !NextPage())
{
TagLibDebugger.Debug("Ogg.File.Packet() -- Could not find the requested packet.");
return null;
}
currentPacketPage = (OggPage)pages[pageIndex];
currentPackets = currentPacketPage.Packets;
packet.Add(currentPackets[0]);
}
return packet;
}
protected void ClearPageData()
{
streamSerialNumber = 0;
pages = new List<OggPage>(); //new ArrayList ();
firstPageHeader = null;
lastPageHeader = null;
packetToPageMap = new List<IntCollection>(); //new ArrayList();
dirtyPackets = new Dictionary<uint, ByteVector>(); //new Hashtable ();
dirtyPages = new IntCollection();
currentPage = null;
currentPacketPage = null;
currentPackets = null;
}
