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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef GDCMJPEGCODEC_H
#define GDCMJPEGCODEC_H
#include "gdcmImageCodec.h"
namespace gdcm
{
class PixelFormat;
class TransferSyntax;
/**
* \brief JPEG codec
* Class to do JPEG (8bits, 12bits, 16bits lossy & lossless).
* It redispatch in between the different codec implementation: JPEG8Codec,
* JPEG12Codec & JPEG16Codec
* It also support inconsistency in between DICOM header and JPEG compressed stream
* ImageCodec implementation for the JPEG case
*
* \note
* Things you should know if you ever want to dive into DICOM/JPEG world (among other):
*
* - http://groups.google.com/group/comp.protocols.dicom/browse_thread/thread/625e46919f2080e1
* - http://groups.google.com/group/comp.protocols.dicom/browse_thread/thread/75fdfccc65a6243
* - http://groups.google.com/group/comp.protocols.dicom/browse_thread/thread/2d525ef6a2f093ed
* - http://groups.google.com/group/comp.protocols.dicom/browse_thread/thread/6b93af410f8c921f
*/
class GDCM_EXPORT JPEGCodec : public ImageCodec
{
friend class ImageRegionReader;
public:
JPEGCodec();
~JPEGCodec();
bool CanDecode(TransferSyntax const &ts) const;
bool CanCode(TransferSyntax const &ts) const;
bool Decode(DataElement const &is, DataElement &os);
void SetPixelFormat(PixelFormat const &pf);
/// Compute the offset table:
void ComputeOffsetTable(bool b);
/// Compress into JPEG
bool Code(DataElement const &in, DataElement &out);
virtual bool GetHeaderInfo(std::istream &is, TransferSyntax &ts);
virtual ImageCodec * Clone() const;
//void SetReversible(bool res);
void SetQuality(double q);
double GetQuality() const;
void SetLossless(bool l);
bool GetLossless() const;
virtual bool EncodeBuffer( std::ostream & out,
const char *inbuffer, size_t inlen);
protected:
bool DecodeExtent(
char *buffer,
unsigned int xmin, unsigned int xmax,
unsigned int ymin, unsigned int ymax,
unsigned int zmin, unsigned int zmax,
std::istream & is
);
bool DecodeByStreams(std::istream &is, std::ostream &os);
bool IsValid(PhotometricInterpretation const &pi);
bool StartEncode( std::ostream & );
bool IsRowEncoder();
bool IsFrameEncoder();
bool AppendRowEncode( std::ostream & out, const char * data, size_t datalen );
bool AppendFrameEncode( std::ostream & out, const char * data, size_t datalen );
bool StopEncode( std::ostream & );
protected:
// Internal method called by SetPixelFormat
// Instantiate the right jpeg codec (8, 12 or 16)
void SetBitSample(int bit);
virtual bool IsStateSuspension() const;
protected:
int BitSample;
//bool Lossless;
int Quality;
private:
void SetupJPEGBitCodec(int bit);
JPEGCodec *Internal;
};
} // end namespace gdcm
#endif //GDCMJPEGCODEC_H
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