/// <summary>
/// This method looks for the beginning of an MPEG-4 header and if one is found it will parse it
/// by calling Parser.Parse().
/// </summary>
override public IDataBlock DetectData(IDataReader dataReader, IDataBlockBuilder dataBlockBuilder, IScanContext context)
{
if (ReferenceHeaders != null)
{
var referenceHeaders = new Dictionary <IDataPacket, VideoObjectLayer>();
foreach (IReferenceHeader header in ReferenceHeaders)
{
IInputFile headerFile = context.CreateReferenceHeaderFile(header);
using (var parser = new Mpeg4Parser(new BitStreamDataReader(headerFile.CreateDataReader())))
{
Mpeg4Header root;
while (parser.ParseRoot(root = new Mpeg4Header(context.Detectors), parser.Length))
{
VideoObjectLayer vol = root.FindChild(Mpeg4HeaderName.VideoObjectLayer, true) as VideoObjectLayer;
if (vol != null)
{
referenceHeaders[headerFile.CreateDataPacket()] = vol;
}
}
}
}
context.ReferenceHeader = referenceHeaders;
}
return(Carve(dataReader, dataBlockBuilder, context));
}
public IDataBlock DetectData(IDataReader dataReader, IDataBlockBuilder dataBlockBuilder, IScanContext context)
{
bool isFragmented = context.IsFragmented;
if (ReferenceHeaders != null)
{
var referenceHeaders = new Dictionary <IDataPacket, ISequenceState>();
foreach (IReferenceHeader header in ReferenceHeaders)
{
IInputFile headerFile = context.CreateReferenceHeaderFile(header);
using (var reader = headerFile.CreateDataReader())
{
var headerDataBlock = _carver.Carve(new BitStreamDataReader(reader), dataBlockBuilder, context);
if (headerDataBlock != null)
{
referenceHeaders[headerFile.CreateDataPacket()] = context.ReferenceHeader as ISequenceState;
}
}
}
context.ReferenceHeader = referenceHeaders;
}
// Restore scan context
context.Results = null;
context.IsFragmented = isFragmented;
// context.ReferenceHeader
return(_carver.Carve(new BitStreamDataReader(dataReader), dataBlockBuilder, context));
}
public int ReadInputFile(IInputFile inputFile, long position, byte[] array, int arrayOffset, int count)
{
PreConditions.Argument("inputFile").Value(inputFile).IsNotNull();
IDataReader dataReader;
if (!_dataReaders.TryGetValue(inputFile, out dataReader))
{
dataReader = inputFile.CreateDataReader();
_dataReaders.Add(inputFile, dataReader);
}
dataReader.Position = position;
return(dataReader.Read(array, arrayOffset, count));
}
private void BuildReferenceHeaders(IScanContext context, IDataBlockBuilder dataBlockBuilder)
{
var referenceHeaders = new Dictionary <IDataPacket, IPictureState>();
foreach (IReferenceHeader header in ReferenceHeaders)
{
IInputFile headerFile = context.CreateReferenceHeaderFile(header);
using (var reader = headerFile.CreateDataReader())
{
var headerDataBlock = _carver.Carve(new BitStreamDataReader(reader), dataBlockBuilder, context);
if (headerDataBlock != null)
{
referenceHeaders[headerFile.CreateDataPacket()] = context.ReferenceHeader as IPictureState;
}
}
}
// Set reference header and reset other state
context.ReferenceHeader = referenceHeaders;
context.Results = null;
context.IsFragmented = false;
}
public IReferenceHeader AddHeader(ICodecDetector detector, string filename)
{
IInputFile inputFile = _createInputFile(new Project(_createInputFile, "dummy.xml"), filename);
using (var dataReader = inputFile.CreateDataReader())
{
var codecParametersBuilder = new CodecParametersBuilder();
IDataPacket headerData = detector.FindReferenceHeader(dataReader, codecParametersBuilder);
if (headerData == null)
{
return(null); // No header detected
}
byte[] b = ReadDataPacketToByteArray(headerData, dataReader);
var header = new ReferenceHeader(b, codecParametersBuilder.Build());
// Use the filename as 'Setting' and leave 'Brand' and 'Model' as undefined.
header.Setting = Path.GetFileNameWithoutExtension(filename);
_referenceHeaders.Add(header);
return(header);
}
}
public void CreateDataReader()
{
Assert.AreSame(_dataReader, _inputFile.CreateDataReader());
}