private void WriteData()
{
var reader = new EbmlReader(new MemoryStream(_oldSegmentInfoData), _oldSegmentInfoData.Length);
// prepare writing part
var infoStream= new MemoryStream();
var infoWriter = new EbmlWriter(infoStream);
var writeMap = new[]
{
new {Id = MatroskaDtd.Segment.Info.Title.Identifier, Value = _title},
new {Id = MatroskaDtd.Segment.Info.WritingApp.Identifier, Value = _writingApp},
};
// enter the Segment block
reader.ReadNext();
reader.EnterContainer();
while (reader.ReadNext())
{
if (!writeMap.Any(arg => arg.Id == reader.ElementId))
{
// copying data as is
var buffer = new byte[reader.ElementSize];
reader.ReadBinary(buffer, 0, (int) reader.ElementSize);
infoWriter.Write(reader.ElementId, buffer);
}
}
// write title/app in case it was not present!
foreach (var e in writeMap.Where(arg => !string.IsNullOrEmpty(arg.Value)))
{
infoWriter.WriteUtf(e.Id, e.Value);
}
var outStream = new MemoryStream(_dataLength);
var writer = new EbmlWriter(outStream);
writer.Write(MatroskaDtd.Segment.Info.Identifier, infoStream.ToArray());
var extraByteCount = _dataLength - outStream.Position;
if (extraByteCount != 0)
{
var extraHLen = StandardDtd.Void.Identifier.Length + 2;
var blankDataLen = (int) (extraByteCount - extraHLen);
if (blankDataLen < 0)
{
throw new InvalidOperationException(string.Format("Not enough space to put the new data, {0} bytes to feet", -blankDataLen));
}
writer.WriteElementHeader(StandardDtd.Void.Identifier, VInt.EncodeSize((ulong)blankDataLen, 2));
writer.Write(new byte[blankDataLen], 0, blankDataLen);
}
if (outStream.Length != _dataLength)
throw new InvalidOperationException("Failed to prepare modified data - block length mismatch");
_stream.Position = _dataStart;
_stream.Write(outStream.ToArray(), 0, _dataLength);
}
private static void ReadContainer(EbmlReader ebmlReader, MatroskaElementDescriptorProvider medp, ResultOfParsingMKV resPars, ulong CurrentClusterTimeCode, StringBuilder sb, string GroupName = "", string add = "")
{
ebmlReader.EnterContainer();
while (ebmlReader.ReadNext())
{
var descriptor = medp.GetElementDescriptor(ebmlReader.ElementId);
if (descriptor == null)
{
sb.Append(add + "undefined \r\n");
continue;
}
string dName = descriptor.Name;
sb.Append(add + dName);
if (dName == "TrackEntry") {
AnalizeTrackEntry(ebmlReader,medp,resPars,sb,GroupName,add);
continue;
}
switch (descriptor.Type)
{
case ElementType.MasterElement:
sb.Append("\r\n");
ReadContainer(ebmlReader, medp, resPars, CurrentClusterTimeCode, sb,descriptor.Name, add + " ");
break;
case ElementType.AsciiString:
sb.Append(" = " + ebmlReader.ReadAscii());
break;
case ElementType.Binary:
if (GroupName == "BlockGroup" && (dName == "Block" || dName == "SimpleBlock"))
{
int lSize = ebmlReader.ElementSize > 1000?1000:Convert.ToInt16(ebmlReader.ElementSize);
byte[] arr = new byte[lSize];
ebmlReader.ReadBinary(arr, 0, lSize);
int TrackNumber = arr[0] & 0x0F;
ulong DurationFromCluster = Convert.ToUInt64(arr[1] * 0xFF + arr[2]);
if (resPars.dicSub.ContainsKey(TrackNumber))
{
Subtitles lsub = resPars.dicSub[TrackNumber];
SubtitleItem subitem = new SubtitleItem();
lsub.Items.Add(subitem);
//subitem.Text = System.Text.Encoding.ASCII.GetString(arr, 4, lSize-4);
subitem.Text = System.Text.Encoding.UTF8.GetString(arr, 4, lSize - 4);
subitem.TimeStart = ((int)(CurrentClusterTimeCode + DurationFromCluster));
// reading the BlockDuration
ebmlReader.ReadNext();
ulong BlockDuration = ebmlReader.ReadUInt();
subitem.TimeEnd = subitem.TimeStart + ((int)BlockDuration);
}
}
sb.Append(" (binary size " + ebmlReader.ElementSize + ")");
break;
case ElementType.Date:
sb.Append(" = " + ebmlReader.ReadDate());
break;
case ElementType.Float:
double flVal = ebmlReader.ReadFloat();
sb.Append(" = " + flVal);
break;
case ElementType.None:
sb.Append(" (none)");
break;
case ElementType.SignedInteger:
sb.Append(" = " + ebmlReader.ReadInt());
break;
case ElementType.UnsignedInteger:
ulong ulVal = ebmlReader.ReadUInt();
if (GroupName == "Cluster" && dName == "Timecode")
{
CurrentClusterTimeCode = ulVal;
}
sb.Append(" = " + ulVal);
break;
case ElementType.Utf8String:
sb.Append(" = " + ebmlReader.ReadUtf());
break;
}
sb.Append("\r\n");
}
ebmlReader.LeaveContainer();
}