private static IDataPacket ProducePlayableExport(IResultNode result, IDataPacket h264StartCodePrefixDataPacket)
{
if (result.DataFormat != CodecID.H264)
{
return(result);
}
if (result.FindAttributeByName("StartCodePrefix") != null)
{
return(result);
}
string nalUnitType = result.FindAttributeByName("NalUnitType").ValueAsString;
int lengthPrefixBytes = ((nalUnitType == "7") || (nalUnitType == "8")) ? 2 : 4;
return(h264StartCodePrefixDataPacket.Append(result.GetSubPacket(lengthPrefixBytes, (result.Length - lengthPrefixBytes))));
}
private long TrimResult()
{
if (_lastHeader == null)
{
return(0L);
}
// Trim zero byte stuffing from last header (if any)
string zeroByteStuffingName = Enum.GetName(typeof(NalUnitParser.Attribute), NalUnitParser.Attribute.TrailingZeroBytes);
var zeroByteStuffingAttribute = _lastHeader.FindAttributeByName(zeroByteStuffingName);
if (zeroByteStuffingAttribute == null)
{
return(0L);
}
uint byteCount = (uint)zeroByteStuffingAttribute.Value;
// Rebuild the last header, omitting the zero byte stuffing attribute
var resultNodeBuilder = new ResultNodeBuilder
{
Name = _lastHeader.Name,
Metadata = _lastHeader,
DataPacket = _lastHeader.GetSubPacket(0, (_lastHeader.Length - byteCount))
};
foreach (IResultAttribute attribute in _lastHeader.Attributes.Where(a => a.Name != zeroByteStuffingName))
{
resultNodeBuilder.AddAttribute(attribute);
}
// Replace the last header with the new (trimmed) header
IResultNode parent = _lastHeader.Parent;
parent.RemoveChild(_lastHeader);
parent.AddChild(resultNodeBuilder.Build());
// Compensate end offset for zero byte trimming
return(-byteCount);
}
public IDataPacket GetSubPacket(long offset, long length)
{
return(_result.GetSubPacket(offset, length));
}