/// <summary>
/// Parses the JPEG2000 file by traversing the boxes from the
/// underlying IO stream.
/// </summary>
/// <returns> A reference to itself for convenience</returns>
protected Jp2File Open()
{
if (_isRaw)
{
Codestream = new JP2Codestream(_stream, 0, _stream.Length);
return(this);
}
_boxes = Jp2Box.TraverseBoxes(_stream, _stream.Length).ToList();
long boxPosition = GetCodestreamOffset();
if (boxPosition < 0)
{
throw new ArgumentException(
"File does not contain JPEG2000 codestream box");
}
var ccBox = _boxes.First(box => box.Type == BoxTypes.CodestreamBox);
Codestream = new JP2Codestream(
_stream,
boxPosition,
(long)ccBox.ContentLength);
return(this);
}
/// <summary>
/// Creates from scratch a JPEG2000 conforming file
/// with a JPEG2000 codestream skeleton.
///
/// </summary>
/// <param name="siz"></param>
/// <param name="cod"></param>
/// <param name="qcd"></param>
/// <param name="reservedTileparts"></param>
/// <param name="stream"></param>
/// <returns></returns>
public static Jp2File Create(
IEnumerable <MarkerSegment> markers,
int reservedTileparts,
bool hasPropertyRights,
Stream stream)
{
var sizs = markers.Where(mrk => mrk.Type == MarkerType.SIZ);
var cods = markers.Where(mrk => mrk.Type == MarkerType.SIZ);
var qcds = markers.Where(mrk => mrk.Type == MarkerType.QCD);
if (!sizs.Any() || !cods.Any() || !qcds.Any())
{
throw new ArgumentException(
"Must supply SIZ, COD and QCD markers");
}
SizMarker siz = sizs.First() as SizMarker;
CodMarker cod = cods.First() as CodMarker;
QcdMarker qcd = qcds.First() as QcdMarker;
ColorSpace colorspace = GetColorspace(siz);
Jp2Box signBox = new Jp2SignatureBox();
Jp2Box ftypBox = new FileTypeBox();
Jp2Box jp2hBox = new Jp2Box((uint)BoxTypes.JP2HeaderBox);
ImageHeaderBox ihdrBox = new ImageHeaderBox(siz, hasPropertyRights);
Jp2Box colrBox = new ColorspaceSpecificationBox(colorspace);
var codestream = new JP2Codestream(markers, reservedTileparts);
var csBox = new ContiguousCodestreamBox(codestream);
if (ihdrBox.BitsPerComponent == ImageHeaderBox.USE_BPC_BOX)
{
throw new NotSupportedException(
"Create image with bit per component specification box");
}
jp2hBox.Add(new List <Jp2Box> {
ihdrBox, colrBox
});
Jp2File jp2File = new Jp2File(stream, new List <Jp2Box> {
signBox, ftypBox, jp2hBox, csBox
});
return(jp2File);
}
