public bool TryDefaultHeaders(IResultState resultState, Action evaluateHeader)
{
if (_state.ReferenceHeadersTested)
{
return(false); // TODO: If the first picture fail to decode using any of the reference headers, subsequent pictures that may work will not be tested!
}
// This will make sure the default headers are tested just once and not for every slice
_state.ReferenceHeadersTested = true;
if (ReferenceHeaders.Count == 0)
{
return(false);
}
long startPosition = Position;
bool isMpeg2 = _state.Picture.HasExtension(ExtensionId.PictureCodingExtensionId);
// Try reference headers to decode this slice
foreach (var referenceHeader in ReferenceHeaders)
{
// Ignore reference headers with MPEG-1 <-> MPEG-2 mismatch
if (referenceHeader.Value.HasExtension(ExtensionId.SequenceExtensionId) == isMpeg2)
{
referenceHeader.Value.CopyTo(_state.Sequence);
evaluateHeader();
//ParseSlice(reader, resultState);
if (resultState.Valid)
{
_state.ReferenceHeader = referenceHeader.Key;
return(true); // Header successfully decoded!
}
}
resultState.Reset();
_dataReader.Position = startPosition;
}
// Not able to decode slice using any default header, defaulting to unparsable slices
_state.Sequence.Reset();
return(false);
}
public void EndResult()
{
Result = null;
}
//public override ExampleHeader GetNextHeader(ExampleHeader previousHeader, long offsetLimit)
//{
// const int nextHeaderLength = 1;
// if (Position > (Length - nextHeaderLength))
// {
// return null;
// }
// // Try to read the directly succeeding chunk
// byte nextExampleHeaderType = NextExampleHeaderType();
// return CreateExampleHeader(previousHeader, nextExampleHeaderType);
//}
///// <summary>
///// Creates an example header of the given <param name="exampleHeaderType"/>.
///// </summary>
///// <param name="previousHeader">the directly preceeding header</param>
///// <param name="exampleHeaderType">the type of example header to create</param>
///// <returns>the example header</returns>
//private static ExampleHeader CreateExampleHeader(ExampleHeader previousHeader, byte exampleHeaderType)
//{
// switch (exampleHeaderType)
// {
// case (byte)ExampleHeaderName.ExampleHeader: return new ExampleHeader(previousHeader);
// }
// return null;
//}
public void StartResult(IResultState resultState)
{
Result = resultState;
}