public void WriteParagraph(Paragraph p, Bitmap bmp, ContentAlignment alignment, Point?overridePosition = null) // inspired by code from SubtitleCreator
{
// timestamp: 00:00:33:900, filepos: 000000000
_idx.AppendLine($"timestamp: {p.StartTime.Hours:00}:{p.StartTime.Minutes:00}:{p.StartTime.Seconds:00}:{p.StartTime.Milliseconds:000}, filepos: {_subFile.Position.ToString("X").PadLeft(9, '0').ToLowerInvariant()}");
var nbmp = new NikseBitmap(bmp);
_emphasis2 = nbmp.ConvertToFourColors(_background, _pattern, _emphasis1, _useInnerAntiAliasing);
var twoPartBuffer = nbmp.RunLengthEncodeForDvd(_background, _pattern, _emphasis1, _emphasis2);
var imageBuffer = GetSubImageBuffer(twoPartBuffer, nbmp, p, alignment, overridePosition);
int bufferIndex = 0;
byte vobSubId = (byte)_languageStreamId;
var mwsub = new MemWriter(200000);
byte[] subHeader = new byte[30];
byte[] ts = new byte[4];
// Lent from "Son2VobSub" by Alain Vielle and Petr Vyskocil
// And also from Sup2VobSub by Emmel
subHeader[0] = 0x00; // MPEG 2 PACK HEADER
subHeader[1] = 0x00;
subHeader[2] = 0x01;
subHeader[3] = 0xba;
subHeader[4] = 0x44;
subHeader[5] = 0x02;
subHeader[6] = 0xc4;
subHeader[7] = 0x82;
subHeader[8] = 0x04;
subHeader[9] = 0xa9;
subHeader[10] = 0x01;
subHeader[11] = 0x89;
subHeader[12] = 0xc3;
subHeader[13] = 0xf8;
subHeader[14] = 0x00; // PES
subHeader[15] = 0x00;
subHeader[16] = 0x01;
subHeader[17] = 0xbd;
int packetSize = imageBuffer.Length;
long toWrite = packetSize; // Image buffer + control sequence length
bool header0 = true;
while (toWrite > 0)
{
long headerSize;
if (header0)
{
header0 = false;
// This is only for first packet
subHeader[20] = 0x81; // mark as original
subHeader[21] = 0x80; // first packet: PTS
subHeader[22] = 0x05; // PES header data length
// PTS (90kHz):
//--------------
subHeader[23] = (byte)((ts[3] & 0xc0) >> 5 | 0x21);
subHeader[24] = (byte)((ts[3] & 0x3f) << 2 | (ts[2] & 0xc0) >> 6);
subHeader[25] = (byte)((ts[2] & 0x3f) << 2 | (ts[1] & 0x80) >> 6 | 0x01);
subHeader[26] = (byte)((ts[1] & 0x7f) << 1 | (ts[0] & 0x80) >> 7);
subHeader[27] = (byte)((ts[0] & 0x7f) << 1 | 0x01);
const string pre = "0010"; // 0011 or 0010 ? (KMPlayer will not understand 0011!!!)
long newPts = (long)(p.StartTime.TotalSeconds * 90000.0);
string bString = Convert.ToString(newPts, 2).PadLeft(33, '0');
string fiveBytesString = pre + bString.Substring(0, 3) + "1" + bString.Substring(3, 15) + "1" + bString.Substring(18, 15) + "1";
for (int i = 0; i < 5; i++)
{
subHeader[23 + i] = Convert.ToByte(fiveBytesString.Substring(i * 8, 8), 2);
}
subHeader[28] = vobSubId;
headerSize = 29;
}
else
{
subHeader[20] = 0x81; // mark as original
subHeader[21] = 0x00; // no PTS
subHeader[22] = 0x00; // header data length
subHeader[23] = vobSubId;
headerSize = 24;
}
if ((toWrite + headerSize) <= 0x800)
{
// write whole image in one 0x800 part
long j = (headerSize - 20) + toWrite;
subHeader[18] = (byte)(j / 0x100);
subHeader[19] = (byte)(j % 0x100);
// First Write header
for (int x = 0; x < headerSize; x++)
{
mwsub.WriteByte(subHeader[x]);
}
// Write Image Data
for (int x = 0; x < toWrite; x++)
{
mwsub.WriteByte(imageBuffer[bufferIndex++]);
}
// Pad remaining space
long paddingSize = 0x800 - headerSize - toWrite;
for (int x = 0; x < paddingSize; x++)
{
mwsub.WriteByte(0xff);
}
toWrite = 0;
}
else
{
// write multiple parts
long blockSize = 0x800 - headerSize;
long j = (headerSize - 20) + blockSize;
subHeader[18] = (byte)(j / 0x100);
subHeader[19] = (byte)(j % 0x100);
// First Write header
for (int x = 0; x < headerSize; x++)
{
mwsub.WriteByte(subHeader[x]);
}
// Write Image Data
for (int x = 0; x < blockSize; x++)
{
mwsub.WriteByte(imageBuffer[bufferIndex++]);
}
toWrite -= blockSize;
}
}
// Write whole memory stream to file
long endPosition = mwsub.GetPosition();
mwsub.GotoBegin();
_subFile.Write(mwsub.GetBuf(), 0, (int)endPosition);
}