private void LoadSubtitleFromMpeg2PesPackets(Subtitle subtitle, Stream stream)
{
long position = 0;
stream.Position = 0;
stream.Seek(position, SeekOrigin.Begin);
long streamLength = stream.Length;
var buffer = new byte[512];
PresentationSegments = new List<DialogPresentationSegment>();
while (position < streamLength)
{
stream.Seek(position, SeekOrigin.Begin);
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead < 20)
break;
int size = (buffer[4] << 8) + buffer[5] + 6;
position += size;
if (bytesRead > 10 && VobSubParser.IsPrivateStream2(buffer, 0))
{
if (buffer[6] == SegmentTypeDialogPresentation)
{
var dps = new DialogPresentationSegment(buffer);
PresentationSegments.Add(dps);
subtitle.Paragraphs.Add(new Paragraph(dps.Text.Trim(), dps.StartPtsMilliseconds, dps.EndPtsMilliseconds));
}
else if (buffer[6] == SegmentTypeDialogStyle)
{
StyleSegment = new DialogStyleSegment(buffer);
}
}
}
}
private void LoadSubtitleFromM2Ts(Subtitle subtitle, Stream ms)
{
var subtitlePackets = new List<Packet>();
const int packetLength = 188;
bool isM2TransportStream = DetectFormat(ms);
var packetBuffer = new byte[packetLength];
var m2TsTimeCodeBuffer = new byte[4];
long position = 0;
ms.Position = 0;
// check for Topfield .rec file
ms.Seek(position, SeekOrigin.Begin);
ms.Read(m2TsTimeCodeBuffer, 0, 3);
if (m2TsTimeCodeBuffer[0] == 0x54 && m2TsTimeCodeBuffer[1] == 0x46 && m2TsTimeCodeBuffer[2] == 0x72)
position = 3760;
long transportStreamLength = ms.Length;
while (position < transportStreamLength)
{
ms.Seek(position, SeekOrigin.Begin);
if (isM2TransportStream)
{
ms.Read(m2TsTimeCodeBuffer, 0, m2TsTimeCodeBuffer.Length);
var tc = (m2TsTimeCodeBuffer[0] << 24) + (m2TsTimeCodeBuffer[1] << 16) + (m2TsTimeCodeBuffer[2] << 8) + (m2TsTimeCodeBuffer[3] & Helper.B00111111);
// should m2ts time code be used in any way?
var msecs = (ulong)Math.Round((tc) / 27.0); // 27 or 90?
var tc2 = new TimeCode(msecs);
System.Diagnostics.Debug.WriteLine(tc2);
position += m2TsTimeCodeBuffer.Length;
}
ms.Read(packetBuffer, 0, packetLength);
byte syncByte = packetBuffer[0];
if (syncByte == Packet.SynchronizationByte)
{
var packet = new Packet(packetBuffer);
if (packet.PacketId == TextSubtitleStreamPid)
{
subtitlePackets.Add(packet);
}
position += packetLength;
}
else
{
position++;
}
}
//TODO: merge ts packets
PresentationSegments = new List<DialogPresentationSegment>();
foreach (var item in subtitlePackets)
{
if (item.Payload != null && item.Payload.Length > 10 && VobSubParser.IsPrivateStream2(item.Payload, 0))
{
if (item.Payload[6] == SegmentTypeDialogPresentation)
{
var dps = new DialogPresentationSegment(item.Payload);
PresentationSegments.Add(dps);
subtitle.Paragraphs.Add(new Paragraph(dps.Text.Trim(), dps.StartPtsMilliseconds, dps.EndPtsMilliseconds));
}
else if (item.Payload[6] == SegmentTypeDialogStyle)
{
StyleSegment = new DialogStyleSegment(item.Payload);
}
}
}
subtitle.Renumber();
}
