public Dictionary <int, Paragraph> GetTeletext(TeletextRunSettings teletextRunSettings, int pageNumber, int pageNumberBcd)
{
var timestamp = PresentationTimestamp.HasValue ? PresentationTimestamp.Value / 90 : 40;
// do not allow timestamp to go back - treat lower timestamp as a reset/overflow
var lastTimestamp = teletextRunSettings.GetLastTimestamp(pageNumber);
teletextRunSettings.SetLastTimestamp(pageNumber, timestamp);
timestamp += teletextRunSettings.GetAddTimestamp(pageNumber);
if (lastTimestamp > 0 && lastTimestamp > timestamp)
{
teletextRunSettings.SetAddTimestamp(pageNumber, lastTimestamp);
}
// offset all time codes if first timestamp in ts file is > 1 sec
timestamp = teletextRunSettings.SubtractStartMs(timestamp);
if (timestamp < 40)
{
timestamp = 40; // Teletext.cs will subtract 40 ms (1 frame @25 fps) and this value must not be below 0
}
var teletextPages = new Dictionary <int, Paragraph>();
var i = 1;
while (i <= _dataBuffer.Length - 6)
{
var dataUnitId = _dataBuffer[i++];
var dataUnitLen = _dataBuffer[i++];
if (dataUnitId == (int)Teletext.DataUnitT.DataUnitEbuTeletextNonSubtitle || dataUnitId == (int)Teletext.DataUnitT.DataUnitEbuTeletextSubtitle)
{
if (dataUnitLen == 44) // teletext payload has always size 44 bytes
{
Teletext.ProcessTelxPacket((Teletext.DataUnitT)dataUnitId, new Teletext.TeletextPacketPayload(_dataBuffer, i), timestamp, teletextRunSettings, pageNumberBcd, pageNumber);
}
}
i += dataUnitLen;
}
if (teletextRunSettings.PageNumberAndParagraph.ContainsKey(pageNumber) && teletextRunSettings.PageNumberAndParagraph[pageNumber] != null)
{
if (teletextPages.ContainsKey(pageNumber))
{
teletextPages[pageNumber] = teletextRunSettings.PageNumberAndParagraph[pageNumber];
}
else
{
teletextPages.Add(pageNumber, teletextRunSettings.PageNumberAndParagraph[pageNumber]);
}
}
teletextRunSettings.PageNumberAndParagraph.Clear();
return(teletextPages);
}
