public Bitstream (Page page)
{
if (page == null)
throw new ArgumentNullException ("page");
// Assume that the first packet is completely enclosed. This should be
// sufficient for codec recognition.
_codec = Codec.GetCodec (page.Packets [0]);
_first_absolute_granular_position = page.Header.AbsoluteGranularPosition;
}
public void AddPage (Page page)
{
pages_read ++;
if (first_page_header == null)
first_page_header = page.Header;
if (page.Packets.Length == 0)
return;
ByteVector[] page_packets = page.Packets;
for (int i = 0; i < page_packets.Length; i ++) {
if ((page.Header.Flags & PageFlags
.FirstPacketContinued) != 0 && i == 0 &&
packets.Count > 0)
packets [packets.Count - 1].Add (page_packets [0]);
else
packets.Add (page_packets [i]);
}
}
public bool ReadPage (Page page)
{
if (page == null)
throw new ArgumentNullException ("page");
ByteVector[] packets = page.Packets;
for (int i = 0; i < packets.Length; i ++)
{
if ((page.Header.Flags & PageFlags.FirstPacketContinued) == 0 && _previous_packet != null)
{
if (ReadPacket (_previous_packet))
return true;
_previous_packet = null;
}
ByteVector packet = packets [i];
// If we're at the first packet of the page, and we're continuing an
// old packet, combine the old with the new.
if (i == 0 && (page.Header.Flags & PageFlags.FirstPacketContinued) != 0 && _previous_packet != null)
{
_previous_packet.Add (packet);
packet = _previous_packet;
}
_previous_packet = null;
// If we're at the last packet of the page, store it.
if (i == packets.Length - 1)
_previous_packet = new ByteVector (packet);
// Otherwise, we need to process it.
else if (ReadPacket (packet))
return true;
}
return false;
}
private Dictionary<uint, Bitstream> ReadStreams (List<Page> pages, out long end)
{
Dictionary<uint, Bitstream> streams = new Dictionary<uint, Bitstream> ();
List<Bitstream> active_streams = new List<Bitstream> ();
long position = 0;
do
{
Bitstream stream = null;
Page page = new Page (this, position);
if ((page.Header.Flags & PageFlags.FirstPageOfStream) != 0)
{
stream = new Bitstream (page);
streams.Add (page.Header.StreamSerialNumber, stream);
active_streams.Add (stream);
}
if (stream == null)
stream = streams [page.Header.StreamSerialNumber];
if (active_streams.Contains (stream) && stream.ReadPage (page))
active_streams.Remove (stream);
if (pages != null)
pages.Add (page);
position += page.Size;
}
while (active_streams.Count > 0);
end = position;
return streams;
}