181 lines
7.2 KiB
C
181 lines
7.2 KiB
C
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/*
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*
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* Copyright (C) 2002-2011, OFFIS e.V.
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* All rights reserved. See COPYRIGHT file for details.
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*
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* This software and supporting documentation were developed by
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*
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* OFFIS e.V.
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* R&D Division Health
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* Escherweg 2
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* D-26121 Oldenburg, Germany
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*
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*
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* Module: dcmdata
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*
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* Author: Marco Eichelberg
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*
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* Purpose: decoder codec class for RLE
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*
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*/
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#ifndef DCRLECCD_H
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#define DCRLECCD_H
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#include "dcmtk/config/osconfig.h"
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#include "dcmtk/dcmdata/dccodec.h" /* for class DcmCodec */
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/** decoder class for RLE.
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* This class only supports decompression, it neither implements
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* encoding nor transcoding.
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*/
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class DCMTK_DCMDATA_EXPORT DcmRLECodecDecoder: public DcmCodec
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{
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public:
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/// default constructor
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DcmRLECodecDecoder();
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/// destructor
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virtual ~DcmRLECodecDecoder();
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/** decompresses the given pixel sequence and
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* stores the result in the given uncompressedPixelData element.
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* @param fromRepParam current representation parameter of compressed data, may be NULL
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* @param pixSeq compressed pixel sequence
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* @param uncompressedPixelData uncompressed pixel data stored in this element
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* @param cp codec parameters for this codec
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* @param objStack stack pointing to the location of the pixel data
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* element in the current dataset.
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* @return EC_Normal if successful, an error code otherwise.
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*/
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virtual OFCondition decode(
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const DcmRepresentationParameter * fromRepParam,
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DcmPixelSequence * pixSeq,
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DcmPolymorphOBOW& uncompressedPixelData,
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const DcmCodecParameter * cp,
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const DcmStack& objStack) const;
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/** decompresses a single frame from the given pixel sequence and
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* stores the result in the given buffer.
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* @param fromParam representation parameter of current compressed
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* representation, may be NULL.
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* @param fromPixSeq compressed pixel sequence
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* @param cp codec parameters for this codec
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* @param dataset pointer to dataset in which pixel data element is contained
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* @param frameNo number of frame, starting with 0 for the first frame
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* @param startFragment index of the compressed fragment that contains
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* all or the first part of the compressed bitstream for the given frameNo.
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* Upon successful return this parameter is updated to contain the index
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* of the first compressed fragment of the next frame.
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* When unknown, zero should be passed. In this case the decompression
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* algorithm will try to determine the index by itself, which will always
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* work if frames are decompressed in increasing order from first to last,
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* but may fail if frames are decompressed in random order, multiple fragments
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* per frame and multiple frames are present in the dataset, and the offset
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* table is empty.
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* @param buffer pointer to buffer where frame is to be stored
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* @param bufSize size of buffer in bytes
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* @param decompressedColorModel upon successful return, the color model
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* of the decompressed image (which may be different from the one used
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* in the compressed images) is returned in this parameter.
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* @return EC_Normal if successful, an error code otherwise.
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*/
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virtual OFCondition decodeFrame(
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const DcmRepresentationParameter * fromParam,
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DcmPixelSequence * fromPixSeq,
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const DcmCodecParameter * cp,
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DcmItem *dataset,
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Uint32 frameNo,
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Uint32& startFragment,
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void *buffer,
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Uint32 bufSize,
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OFString& decompressedColorModel) const;
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/** compresses the given uncompressed DICOM image and stores
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* the result in the given pixSeq element.
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* @param pixelData pointer to the uncompressed image data in OW format
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* and local byte order
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* @param length of the pixel data field in bytes
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* @param toRepParam representation parameter describing the desired
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* compressed representation (e.g. JPEG quality)
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* @param pixSeq compressed pixel sequence (pointer to new DcmPixelSequence object
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* allocated on heap) returned in this parameter upon success.
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* @param cp codec parameters for this codec
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* @param objStack stack pointing to the location of the pixel data
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* element in the current dataset.
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* @return EC_Normal if successful, an error code otherwise.
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*/
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virtual OFCondition encode(
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const Uint16 * pixelData,
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const Uint32 length,
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const DcmRepresentationParameter * toRepParam,
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DcmPixelSequence * & pixSeq,
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const DcmCodecParameter *cp,
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DcmStack & objStack) const;
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/** transcodes (re-compresses) the given compressed DICOM image and stores
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* the result in the given toPixSeq element.
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* @param fromRepType current transfer syntax of the compressed image
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* @param fromRepParam current representation parameter of compressed data, may be NULL
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* @param fromPixSeq compressed pixel sequence
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* @param toRepParam representation parameter describing the desired
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* new compressed representation (e.g. JPEG quality)
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* @param toPixSeq compressed pixel sequence (pointer to new DcmPixelSequence object
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* allocated on heap) returned in this parameter upon success.
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* @param cp codec parameters for this codec
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* @param objStack stack pointing to the location of the pixel data
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* element in the current dataset.
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* @return EC_Normal if successful, an error code otherwise.
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*/
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virtual OFCondition encode(
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const E_TransferSyntax fromRepType,
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const DcmRepresentationParameter * fromRepParam,
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DcmPixelSequence * fromPixSeq,
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const DcmRepresentationParameter * toRepParam,
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DcmPixelSequence * & toPixSeq,
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const DcmCodecParameter * cp,
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DcmStack & objStack) const;
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/** checks if this codec is able to convert from the
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* given current transfer syntax to the given new
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* transfer syntax
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* @param oldRepType current transfer syntax
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* @param newRepType desired new transfer syntax
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* @return true if transformation is supported by this codec, false otherwise.
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*/
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virtual OFBool canChangeCoding(
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const E_TransferSyntax oldRepType,
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const E_TransferSyntax newRepType) const;
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/** determine color model of the decompressed image
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* @param fromParam representation parameter of current compressed
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* representation, may be NULL
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* @param fromPixSeq compressed pixel sequence
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* @param cp codec parameters for this codec
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* @param dataset pointer to dataset in which pixel data element is contained
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* @param dataset pointer to DICOM dataset in which this pixel data object
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* is located. Used to access photometric interpretation.
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* @param decompressedColorModel upon successful return, the color model
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* of the decompressed image (which may be different from the one used
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* in the compressed images) is returned in this parameter
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* @return EC_Normal if successful, an error code otherwise
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*/
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virtual OFCondition determineDecompressedColorModel(
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const DcmRepresentationParameter *fromParam,
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DcmPixelSequence *fromPixSeq,
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const DcmCodecParameter *cp,
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DcmItem *dataset,
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OFString &decompressedColorModel) const;
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private:
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/// private undefined copy constructor
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DcmRLECodecDecoder(const DcmRLECodecDecoder&);
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/// private undefined copy assignment operator
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DcmRLECodecDecoder& operator=(const DcmRLECodecDecoder&);
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};
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#endif
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