public bool ValidateDataBlock(IDataBlockBuilder dataBlockBuilder, long startOffset, long endOffset)
{
if (!IsValidResult())
{
return(false);
}
dataBlockBuilder.DataFormat = _state.IsMpeg2() ? CodecID.Mpeg2System : CodecID.Mpeg1System;
dataBlockBuilder.IsFullFile = IsFullFile();
dataBlockBuilder.IsFragmented = _state.IsFragmented;
// Trim zero byte stuffing from last header (if any)
if (_state.LastHeaderZeroByteStuffing > 0)
{
dataBlockBuilder.EndOffset = endOffset - _state.LastHeaderZeroByteStuffing;
}
foreach (ushort streamId in _state.Streams.StreamIds)
{
IDataPacket streamData = _state.Streams[streamId].GetStreamData();
if (streamData != null)
{
string name = GetStreamName(streamId);
if (name != null)
{
ICodecStreamBuilder codecStreamBuilder = dataBlockBuilder.AddCodecStream();
codecStreamBuilder.Name = name;
codecStreamBuilder.DataFormat = name.StartsWith("Video") ? CodecID.Mpeg2Video : CodecID.Unknown;
codecStreamBuilder.StreamNumber = streamId;
codecStreamBuilder.Data = streamData;
codecStreamBuilder.AbsoluteStartOffset = codecStreamBuilder.Data.StartOffset;
}
}
}
return(true);
}
private bool IsContinuousStream(IMpeg2SystemState state, ulong systemClockReference)
{
ulong lastSystemClockReference = state.LastSystemClockReference;
if (lastSystemClockReference == FirstSystemClockReference)
{
return(true);
}
// Compare system clock reference to last system clock reference.
// It should be higher and have a limited time gap.
if (systemClockReference < lastSystemClockReference)
{
return(false); // Indicates a discontinuity because of a backwards jump in time
}
ulong timeGap = (systemClockReference - lastSystemClockReference);
return(timeGap < ((state.IsMpeg2() ? 27E6 : 90E3) * _maxTimeGapSeconds));
}