dccodec.h

/*
 *
 *  Copyright (C) 1994-2003, OFFIS
 *
 *  This software and supporting documentation were developed by
 *
 *    Kuratorium OFFIS e.V.
 *    Healthcare Information and Communication Systems
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *  THIS SOFTWARE IS MADE AVAILABLE,  AS IS,  AND OFFIS MAKES NO  WARRANTY
 *  REGARDING  THE  SOFTWARE,  ITS  PERFORMANCE,  ITS  MERCHANTABILITY  OR
 *  FITNESS FOR ANY PARTICULAR USE, FREEDOM FROM ANY COMPUTER DISEASES  OR
 *  ITS CONFORMITY TO ANY SPECIFICATION. THE ENTIRE RISK AS TO QUALITY AND
 *  PERFORMANCE OF THE SOFTWARE IS WITH THE USER.
 *
 *  Module:  dcmdata
 *
 *  Author:  Andreas Barth
 *
 *  Purpose: Interface of abstract class DcmCodec and the class DcmCodecStruct
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2003/06/12 13:35:23 $
 *  Source File:      $Source: /share/dicom/cvs-depot/dcmtk/dcmdata/include/dccodec.h,v $
 *  CVS/RCS Revision: $Revision: 1.15 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCCODEC_H
#define DCCODEC_H

#include "osconfig.h"    /* make sure OS specific configuration is included first */
#include "dctypes.h"
#include "dcerror.h"
#include "dcxfer.h"
#include "oflist.h"

class DcmStack;
class DcmRepresentationParameter;
class DcmPixelSequence;
class DcmPolymorphOBOW;
class DcmItem;
class DcmTagKey;

class DcmCodecParameter
{
public:
    DcmCodecParameter() {}

    DcmCodecParameter(const DcmCodecParameter&) {}

    virtual ~DcmCodecParameter() {}
    
    virtual DcmCodecParameter *clone() const = 0;

    virtual const char *className() const = 0;

};                    


class DcmCodec
{
public:
  DcmCodec() {}

  virtual OFCondition decode(
      const DcmRepresentationParameter * fromRepParam,
      DcmPixelSequence * pixSeq,
      DcmPolymorphOBOW& uncompressedPixelData,
      const DcmCodecParameter * cp,
      const DcmStack& objStack) const = 0;

  virtual OFCondition encode(
      const Uint16 * pixelData,
      const Uint32 length,
      const DcmRepresentationParameter * toRepParam,
      DcmPixelSequence * & pixSeq,
      const DcmCodecParameter *cp,
      DcmStack & objStack) const = 0;

  virtual OFCondition encode(
      const E_TransferSyntax fromRepType,
      const DcmRepresentationParameter * fromRepParam,
      DcmPixelSequence * fromPixSeq,
      const DcmRepresentationParameter * toRepParam,
      DcmPixelSequence * & toPixSeq,
      const DcmCodecParameter * cp,
      DcmStack & objStack) const = 0;

  virtual OFBool canChangeCoding(
      const E_TransferSyntax oldRepType,
      const E_TransferSyntax newRepType) const = 0;


  // static helper methods that have proven useful in codec classes derived from DcmCodec 

  static OFCondition insertStringIfMissing(DcmItem *dataset, const DcmTagKey& tag, const char *val);

  static OFCondition convertToSecondaryCapture(DcmItem *dataset);

  static OFCondition newInstance(DcmItem *dataset);

  static OFCondition updateImageType(DcmItem *dataset);

};


class DcmCodecList
{

public:

  virtual ~DcmCodecList();

  static OFCondition registerCodec(
    const DcmCodec *aCodec,  
    const DcmRepresentationParameter *aDefaultRepParam,
    const DcmCodecParameter *aCodecParameter);

  static OFCondition deregisterCodec(const DcmCodec *aCodec);
    
  static OFCondition updateCodecParameter(
    const DcmCodec *aCodec,
    const DcmCodecParameter *aCodecParameter);

  static OFCondition decode(
    const DcmXfer & fromType,
    const DcmRepresentationParameter * fromParam,
    DcmPixelSequence * fromPixSeq,
    DcmPolymorphOBOW& uncompressedPixelData,
    DcmStack & pixelStack);

  static OFCondition encode(
    const E_TransferSyntax fromRepType,
    const Uint16 * pixelData,
    const Uint32 length,
    const E_TransferSyntax toRepType,
    const DcmRepresentationParameter * toRepParam,
    DcmPixelSequence * & pixSeq,
    DcmStack & pixelStack);

  static OFCondition encode(
    const E_TransferSyntax fromRepType,
    const DcmRepresentationParameter * fromParam, 
    DcmPixelSequence * fromPixSeq, 
    const E_TransferSyntax toRepType,
    const DcmRepresentationParameter * toRepParam,
    DcmPixelSequence * & toPixSeq,
    DcmStack & pixelStack);


  static OFBool canChangeCoding(
    const E_TransferSyntax fromRepType,
    const E_TransferSyntax toRepType);

private:

  DcmCodecList(
    const DcmCodec *aCodec,  
    const DcmRepresentationParameter *aDefaultRepParam,
    const DcmCodecParameter *aCodecParameter);

  DcmCodecList(const DcmCodecList &);

  DcmCodecList &operator=(const DcmCodecList &);

  const DcmCodec * codec;
  
  const DcmRepresentationParameter * defaultRepParam;
  
  const DcmCodecParameter * codecParameter;

  static OFList<DcmCodecList *> registeredCodecs;
  
#ifdef _REENTRANT

  static OFReadWriteLock codecLock;
#endif

  // dummy friend declaration to prevent gcc from complaining
  // that this class only defines private constructors and has no friends.
  friend class DcmCodecListDummyFriend;
};
 

#endif

/*
** CVS/RCS Log:
** $Log: dccodec.h,v $
** Revision 1.15  2003/06/12 13:35:23  joergr
** Fixed inconsistent API documentation reported by Doxygen.
**
** Revision 1.14  2002/05/24 14:51:41  meichel
** Moved helper methods that are useful for different compression techniques
**   from module dcmjpeg to module dcmdata
**
** Revision 1.13  2002/02/27 14:21:20  meichel
** Declare dcmdata read/write locks only when compiled in multi-thread mode
**
** Revision 1.12  2001/11/12 16:29:51  meichel
** Added dummy friend class declaration to singleton class DcmCodecList
**   to keep gcc from squawking.
**
** Revision 1.11  2001/11/08 16:19:39  meichel
** Changed interface for codec registration. Now everything is thread-safe
**   and multiple codecs can be registered for a single transfer syntax (e.g.
**   one encoder and one decoder).
**
** Revision 1.10  2001/09/25 17:19:07  meichel
** Updated abstract class DcmCodecParameter for use with dcmjpeg.
**   Added new function deregisterGlobalCodec().
**
** Revision 1.9  2001/06/01 15:48:34  meichel
** Updated copyright header
**
** Revision 1.8  2001/05/25 09:53:51  meichel
** Modified DcmCodec::decode() interface, required for future dcmjpeg module.
**
** Revision 1.7  2000/09/27 08:19:54  meichel
** Minor changes in DcmCodec interface, required for future dcmjpeg module.
**
** Revision 1.6  2000/04/14 16:09:12  meichel
** Made function DcmCodec and related functions thread safe.
**   registerGlobalCodec() should not be called anymore from the constructor
**   of global objects.
**
** Revision 1.5  2000/03/08 16:26:11  meichel
** Updated copyright header.
**
** Revision 1.4  1999/03/31 09:24:31  meichel
** Updated copyright header in module dcmdata
**
** Revision 1.3  1998/07/15 15:48:43  joergr
** Removed several compiler warnings reported by gcc 2.8.1 with
** additional options, e.g. missing copy constructors and assignment
** operators, initialization of member variables in the body of a
** constructor instead of the member initialization list, hiding of
** methods by use of identical names, uninitialized member variables,
** missing const declaration of char pointers. Replaced tabs by spaces.
**
** Revision 1.2  1997/07/24 13:07:45  andreas
** - Make DcmCodec:canChangeCoding abstract
**
** Revision 1.1  1997/07/21 07:54:57  andreas
** - New environment for encapsulated pixel representations. DcmPixelData
**   can contain different representations and uses codecs to convert
**   between them. Codecs are derived from the DcmCodec class. New error
**   codes are introduced for handling of representations. New internal
**   value representation (only for ident()) for PixelData
** 
*/

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