private void Read(ReadStyle properties_style)
{
long end;
Dictionary <uint, Bitstream> streams = ReadStreams(null, out end);
List <ICodec> codecs = new List <ICodec> ();
InvariantStartPosition = end;
InvariantEndPosition = Length;
foreach (uint id in streams.Keys)
{
tag.AddComment(id, streams [id].Codec.CommentData);
codecs.Add(streams [id].Codec);
}
if (properties_style == ReadStyle.None)
{
return;
}
PageHeader last_header = LastPageHeader;
TimeSpan duration = streams [last_header.StreamSerialNumber].GetDuration(last_header.AbsoluteGranularPosition);
properties = new Properties(duration, codecs);
}
public bool Equals(PageHeader other)
{
return(_packet_sizes == other._packet_sizes &&
_version == other._version && _flags == other._flags &&
_absolute_granular_position == other._absolute_granular_position &&
_stream_serial_number == other._stream_serial_number &&
_page_sequence_number == other._page_sequence_number &&
_size == other._size && _data_size == other._data_size);
}
public static void OverwriteSequenceNumbers(File file,
long position,
IDictionary <uint, int> shiftTable)
{
bool done = true;
foreach (KeyValuePair <uint, int> pair in shiftTable)
{
if (pair.Value != 0)
{
done = false;
break;
}
}
if (done)
{
return;
}
while (position < file.Length)
{
PageHeader header = new PageHeader(file, position);
int size = (int)(header.Size + header.DataSize);
if (shiftTable.ContainsKey(header.StreamSerialNumber) &&
shiftTable [header.StreamSerialNumber] != 0)
{
file.Seek(position);
ByteVector page_data = file.ReadBlock(size);
ByteVector new_data = ByteVector.FromUInt(
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i++)
{
page_data [i] = new_data [i - 18];
}
for (int i = 22; i < 26; i++)
{
page_data [i] = 0;
}
new_data.Add(ByteVector.FromUInt(
page_data.Checksum, false));
file.Seek(position + 18);
file.WriteBlock(new_data);
}
position += size;
}
}
public Page (ByteVectorCollection packets, PageHeader header) : this (header)
{
if (packets == null)
throw new ArgumentNullException ("packets");
this.packets = packets;
List<int> packet_sizes = new List<int> ();
// Build a page from the list of packets.
foreach (ByteVector v in packets)
packet_sizes.Add (v.Count);
header.PacketSizes = packet_sizes.ToArray ();
}
public PageHeader(PageHeader original, uint offset, PageFlags flags)
{
_version = original._version;
_flags = flags;
_absolute_granular_position = original._absolute_granular_position;
_stream_serial_number = original._stream_serial_number;
_page_sequence_number = original._page_sequence_number + offset;
_size = original._size;
_data_size = original._data_size;
_packet_sizes = new List <int> ();
if (_page_sequence_number == 0 && (flags & PageFlags.FirstPacketContinued) == 0)
{
_flags |= PageFlags.FirstPageOfStream;
}
}
public Page(ByteVectorCollection packets, PageHeader header) : this(header)
{
if (packets == null)
{
throw new ArgumentNullException("packets");
}
this.packets = packets;
List <int> packet_sizes = new List <int> ();
// Build a page from the list of packets.
foreach (ByteVector v in packets)
{
packet_sizes.Add(v.Count);
}
header.PacketSizes = packet_sizes.ToArray();
}
public bool Equals (PageHeader other)
{
return _packet_sizes == other._packet_sizes &&
_version == other._version && _flags == other._flags &&
_absolute_granular_position == other._absolute_granular_position &&
_stream_serial_number == other._stream_serial_number &&
_page_sequence_number == other._page_sequence_number &&
_size == other._size && _data_size == other._data_size;
}
public PageHeader (PageHeader original, uint offset, PageFlags flags)
{
_version = original._version;
_flags = flags;
_absolute_granular_position = original._absolute_granular_position;
_stream_serial_number = original._stream_serial_number;
_page_sequence_number = original._page_sequence_number + offset;
_size = original._size;
_data_size = original._data_size;
_packet_sizes = new List<int> ();
if (_page_sequence_number == 0 && (flags & PageFlags.FirstPacketContinued) == 0)
_flags |= PageFlags.FirstPageOfStream;
}
protected Page(PageHeader header)
{
this.header = header;
packets = new ByteVectorCollection();
}
public static void OverwriteSequenceNumbers (File file,
long position,
IDictionary<uint, int> shiftTable)
{
bool done = true;
foreach (KeyValuePair<uint, int> pair in shiftTable)
if (pair.Value != 0) {
done = false;
break;
}
if (done)
return;
while (position < file.Length) {
PageHeader header = new PageHeader (file, position);
int size = (int) (header.Size + header.DataSize);
if (shiftTable.ContainsKey (header.StreamSerialNumber)
&& shiftTable [header.StreamSerialNumber] != 0) {
file.Seek (position);
ByteVector page_data = file.ReadBlock (size);
ByteVector new_data = ByteVector.FromUInt (
(uint)(header.PageSequenceNumber +
shiftTable [header.StreamSerialNumber]),
false);
for (int i = 18; i < 22; i ++)
page_data [i] = new_data [i - 18];
for (int i = 22; i < 26; i++)
page_data [i] = 0;
new_data.Add (ByteVector.FromUInt (
page_data.Checksum, false));
file.Seek (position + 18);
file.WriteBlock (new_data);
}
position += size;
}
}
protected Page (PageHeader header)
{
this.header = header;
packets = new ByteVectorCollection ();
}
public Page [] Paginate(out int change)
{
// Ogg Pagination: Welcome to sucksville!
// If you don't understand this, you're not alone.
// It is confusing as Hell.
// TODO: Document this method, in the mean time, there
// is always http://xiph.org/ogg/doc/framing.html
if (pages_read == 0)
{
change = 0;
return(new Page [0]);
}
int count = pages_read;
ByteVectorCollection packets = new ByteVectorCollection(
this.packets);
PageHeader first_header = (PageHeader)first_page_header;
List <Page> pages = new List <Page> ();
uint index = 0;
bool bos = first_header.PageSequenceNumber == 0;
if (bos)
{
pages.Add(new Page(new ByteVectorCollection(packets [0]), first_header));
index++;
packets.RemoveAt(0);
count--;
}
int lacing_per_page = 0xfc;
if (count > 0)
{
int total_lacing_bytes = 0;
for (int i = 0; i < packets.Count; i++)
{
total_lacing_bytes += GetLacingValueLength(
packets, i);
}
lacing_per_page = Math.Min(total_lacing_bytes / count + 1, lacing_per_page);
}
int lacing_bytes_used = 0;
ByteVectorCollection page_packets = new ByteVectorCollection();
bool first_packet_continued = false;
while (packets.Count > 0)
{
int packet_bytes = GetLacingValueLength(packets, 0);
int remaining = lacing_per_page - lacing_bytes_used;
bool whole_packet = packet_bytes <= remaining;
if (whole_packet)
{
page_packets.Add(packets [0]);
lacing_bytes_used += packet_bytes;
packets.RemoveAt(0);
}
else
{
page_packets.Add(packets [0].Mid(0, remaining * 0xff));
packets [0] = packets [0].Mid(remaining * 0xff);
lacing_bytes_used += remaining;
}
if (lacing_bytes_used == lacing_per_page)
{
pages.Add(new Page(page_packets,
new PageHeader(first_header,
index, first_packet_continued ?
PageFlags.FirstPacketContinued :
PageFlags.None)));
page_packets = new ByteVectorCollection();
lacing_bytes_used = 0;
index++;
count--;
first_packet_continued = !whole_packet;
}
}
if (page_packets.Count > 0)
{
pages.Add(new Page(page_packets,
new PageHeader(
first_header.StreamSerialNumber,
index, first_packet_continued ?
PageFlags.FirstPacketContinued :
PageFlags.None)));
index++;
count--;
}
change = -count;
return(pages.ToArray());
}
