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|
/*
*
* Copyright (C) 2001-2024, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: dcmjpeg
*
* Author: Marco Eichelberg, Norbert Olges
*
* Purpose: Abstract base class for IJG JPEG decoder
*
*/
#include "dcmtk/config/osconfig.h"
#include "dcmtk/dcmjpeg/djcodecd.h"
#include "dcmtk/ofstd/ofstd.h"
// dcmdata includes
#include "dcmtk/dcmdata/dcdatset.h" /* for class DcmDataset */
#include "dcmtk/dcmdata/dcdeftag.h" /* for tag constants */
#include "dcmtk/dcmdata/dcpixseq.h" /* for class DcmPixelSequence */
#include "dcmtk/dcmdata/dcpxitem.h" /* for class DcmPixelItem */
#include "dcmtk/dcmdata/dcvrpobw.h" /* for class DcmPolymorphOBOW */
#include "dcmtk/dcmdata/dcswap.h" /* for swapIfNecessary() */
#include "dcmtk/dcmdata/dcuid.h" /* for dcmGenerateUniqueIdentifer()*/
// dcmjpeg includes
#include "dcmtk/dcmjpeg/djcparam.h" /* for class DJCodecParameter */
#include "dcmtk/dcmjpeg/djdecabs.h" /* for class DJDecoder */
DJCodecDecoder::DJCodecDecoder()
: DcmCodec()
{
}
DJCodecDecoder::~DJCodecDecoder()
{
}
OFBool DJCodecDecoder::canChangeCoding(
const E_TransferSyntax oldRepType,
const E_TransferSyntax newRepType) const
{
E_TransferSyntax myXfer = supportedTransferSyntax();
DcmXfer newRep(newRepType);
if (newRep.usesNativeFormat() && (oldRepType == myXfer))
return OFTrue; // decompress requested
// we don't support re-coding for now.
return OFFalse;
}
OFCondition DJCodecDecoder::decode(
const DcmRepresentationParameter * fromRepParam,
DcmPixelSequence * pixSeq,
DcmPolymorphOBOW& uncompressedPixelData,
const DcmCodecParameter * cp,
const DcmStack& objStack,
OFBool& removeOldRep) const
{
OFCondition result = EC_Normal;
// this codec may modify the DICOM header such that the previous pixel
// representation is not valid anymore. Indicate this to the caller
// to trigger removal.
removeOldRep = OFTrue;
// assume we can cast the codec parameter to what we need
const DJCodecParameter *djcp = OFreinterpret_cast(const DJCodecParameter*, cp);
DcmStack localStack(objStack);
(void)localStack.pop(); // pop pixel data element from stack
DcmObject *dataset = localStack.pop(); // this is the item in which the pixel data is located
if ((!dataset)||((dataset->ident()!= EVR_dataset) && (dataset->ident()!= EVR_item))) result = EC_InvalidTag;
else
{
Uint16 imageSamplesPerPixel = 0;
Uint16 imageRows = 0;
Uint16 imageColumns = 0;
Sint32 imageFrames = 1;
Uint16 imageBitsAllocated = 0;
Uint16 imageBitsStored = 0;
Uint16 imageHighBit = 0;
const char *sopClassUID = NULL;
OFBool createPlanarConfiguration = OFFalse;
OFBool createPlanarConfigurationInitialized = OFFalse;
EP_Interpretation colorModel = EPI_Unknown;
OFBool isSigned = OFFalse;
Uint16 pixelRep = 0; // needed to decline color conversion of signed pixel data to RGB
OFBool numberOfFramesPresent = OFFalse;
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_SamplesPerPixel, imageSamplesPerPixel);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_Rows, imageRows);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_Columns, imageColumns);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_BitsAllocated, imageBitsAllocated);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_BitsStored, imageBitsStored);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_HighBit, imageHighBit);
if (result.good()) result = OFreinterpret_cast(DcmItem*, dataset)->findAndGetUint16(DCM_PixelRepresentation, pixelRep);
isSigned = (pixelRep == 0) ? OFFalse : OFTrue;
// number of frames is an optional attribute - we don't mind if it isn't present.
if (result.good())
{
if (OFreinterpret_cast(DcmItem*, dataset)->findAndGetSint32(DCM_NumberOfFrames, imageFrames).good()) numberOfFramesPresent = OFTrue;
}
// we consider SOP Class UID as optional since we only need it to determine SOP Class specific
// encoding rules for planar configuration.
if (result.good()) (void) OFreinterpret_cast(DcmItem*, dataset)->findAndGetString(DCM_SOPClassUID, sopClassUID);
EP_Interpretation dicomPI = DcmJpegHelper::getPhotometricInterpretation(OFreinterpret_cast(DcmItem*, dataset));
OFBool isYBR = OFFalse;
if ((dicomPI == EPI_YBR_Full)||(dicomPI == EPI_YBR_Full_422)||(dicomPI == EPI_YBR_Partial_422)) isYBR = OFTrue;
if (imageFrames >= OFstatic_cast(Sint32, pixSeq->card()))
imageFrames = OFstatic_cast(Sint32, pixSeq->card() - 1); // limit number of frames to number of pixel items - 1
if (imageFrames < 1)
imageFrames = 1; // default in case the number of frames attribute contains garbage
if (result.good())
{
DcmPixelItem *pixItem = NULL;
Uint8 * jpegData = NULL;
result = pixSeq->getItem(pixItem, 1); // first item is offset table, use second item
if (result.good() && (pixItem != NULL))
{
Uint32 fragmentLength = pixItem->getLength();
result = pixItem->getUint8Array(jpegData);
if (result.good())
{
if (jpegData == NULL) result = EC_CorruptedData; // JPEG data stream is empty/absent
else
{
Uint8 precision = scanJpegDataForBitDepth(jpegData, fragmentLength);
if (precision == 0) result = EC_CannotChangeRepresentation; // something has gone wrong, bail out
else
{
DJDecoder *jpeg = createDecoderInstance(fromRepParam, djcp, precision, isYBR);
if (jpeg == NULL) result = EC_MemoryExhausted;
else
{
Uint32 imageBytesAllocated = (precision > 8) ? sizeof(Uint16) : sizeof(Uint8);
Uint32 frameSize = imageBytesAllocated * imageRows * imageColumns * imageSamplesPerPixel;
// check for overflow
if (imageRows != 0 && frameSize / imageRows != (imageBytesAllocated * imageColumns * imageSamplesPerPixel))
{
DCMJPEG_WARN("cannot decompress image because uncompressed representation would exceed maximum possible size of PixelData attribute");
return EC_ElemLengthExceeds32BitField;
}
Uint32 totalSize = frameSize * imageFrames;
// check for overflow
if (totalSize == 0xFFFFFFFF || (frameSize != 0 && totalSize / frameSize != OFstatic_cast(Uint32, imageFrames)))
{
DCMJPEG_WARN("cannot decompress image because uncompressed representation would exceed maximum possible size of PixelData attribute");
return EC_ElemLengthExceeds32BitField;
}
if (totalSize & 1) totalSize++; // align on 16-bit word boundary
Uint16 *imageData16 = NULL;
Sint32 currentFrame = 0;
size_t currentItem = 1; // ignore offset table
if (isYBR && (imageBitsStored < imageBitsAllocated)) // check for a special case that is currently not handled properly
{
if (djcp->getDecompressionColorSpaceConversion() != EDC_never)
{
DCMJPEG_WARN("BitsStored < BitsAllocated for JPEG compressed image with YCbCr color model, color space conversion will probably not work properly");
DCMJPEG_DEBUG("workaround: use option --conv-never (for command line tools) or EDC_never (for the DJDecoderRegistration::registerCodecs() call)");
}
}
result = uncompressedPixelData.createUint16Array(totalSize / sizeof(Uint16), imageData16);
if (result.good())
{
Uint8 *imageData8 = OFreinterpret_cast(Uint8*, imageData16);
OFBool forceSingleFragmentPerFrame = djcp->getForceSingleFragmentPerFrame();
while ((currentFrame < imageFrames)&&(result.good()))
{
result = jpeg->init();
if (result.good())
{
result = EJ_Suspension;
while (EJ_Suspension == result)
{
result = pixSeq->getItem(pixItem, OFstatic_cast(Uint32, currentItem++));
if (result.good())
{
fragmentLength = pixItem->getLength();
result = pixItem->getUint8Array(jpegData);
if (result.good())
{
result = jpeg->decode(jpegData, fragmentLength, imageData8, OFstatic_cast(Uint32, frameSize), isSigned);
// check if we should enforce "one fragment per frame" while
// decompressing a multi-frame image even if stream suspension occurs
if ((EJ_Suspension == result) && forceSingleFragmentPerFrame)
{
// frame is incomplete. Nevertheless skip to next frame.
// This permits decompression of faulty multi-frame images.
result = EC_Normal;
}
}
}
}
if (result.good())
{
if (! createPlanarConfigurationInitialized)
{
// we need to know the decompressed photometric interpretation in order
// to determine the final planar configuration. However, this is only
// known after the first call to jpeg->decode(), i.e. here.
colorModel = jpeg->getDecompressedColorModel();
if (colorModel == EPI_Unknown)
{
// derive color model from DICOM photometric interpretation
if ((dicomPI == EPI_YBR_Full_422)||(dicomPI == EPI_YBR_Partial_422)) colorModel = EPI_YBR_Full;
else colorModel = dicomPI;
}
switch (djcp->getPlanarConfiguration())
{
case EPC_default:
createPlanarConfiguration = requiresPlanarConfiguration(sopClassUID, colorModel);
break;
case EPC_colorByPixel:
createPlanarConfiguration = OFFalse;
break;
case EPC_colorByPlane:
createPlanarConfiguration = OFTrue;
break;
}
createPlanarConfigurationInitialized = OFTrue;
}
// convert planar configuration if necessary
if ((imageSamplesPerPixel == 3) && createPlanarConfiguration)
{
if (precision > 8)
result = createPlanarConfigurationWord(OFreinterpret_cast(Uint16*, imageData8), imageColumns, imageRows);
else result = createPlanarConfigurationByte(imageData8, imageColumns, imageRows);
}
currentFrame++;
imageData8 += frameSize;
}
}
}
if (result.good())
{
// decompression is complete, finally adjust byte order if necessary
if (jpeg->bytesPerSample() == 1) // we're writing bytes into words
{
result = swapIfNecessary(gLocalByteOrder, EBO_LittleEndian, imageData16,
OFstatic_cast(Uint32, totalSize), sizeof(Uint16));
}
}
// adjust photometric interpretation depending on what conversion has taken place
if (result.good())
{
switch (colorModel)
{
case EPI_Monochrome2:
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertString(DCM_PhotometricInterpretation, "MONOCHROME2");
if (result.good())
{
imageSamplesPerPixel = 1;
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_SamplesPerPixel, imageSamplesPerPixel);
}
break;
case EPI_YBR_Full:
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertString(DCM_PhotometricInterpretation, "YBR_FULL");
if (result.good())
{
imageSamplesPerPixel = 3;
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_SamplesPerPixel, imageSamplesPerPixel);
}
break;
case EPI_RGB:
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertString(DCM_PhotometricInterpretation, "RGB");
if (result.good())
{
imageSamplesPerPixel = 3;
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_SamplesPerPixel, imageSamplesPerPixel);
}
break;
default:
/* leave photometric interpretation untouched unless it is YBR_FULL_422
* or YBR_PARTIAL_422. In this case, replace by YBR_FULL since decompression
* eliminates the subsampling.
*/
if ((dicomPI == EPI_YBR_Full_422)||(dicomPI == EPI_YBR_Partial_422))
{
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertString(DCM_PhotometricInterpretation, "YBR_FULL");
}
break;
}
}
// Bits Allocated is now either 8 or 16
if (result.good())
{
if (precision > 8) result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_BitsAllocated, 16);
else result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_BitsAllocated, 8);
}
// Planar Configuration depends on the createPlanarConfiguration flag
if ((result.good()) && (imageSamplesPerPixel > 1))
{
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_PlanarConfiguration, (createPlanarConfiguration ? 1 : 0));
}
// Bits Stored cannot be larger than precision
if ((result.good()) && (imageBitsStored > precision))
{
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_BitsStored, precision);
}
// High Bit cannot be larger than precision - 1
if ((result.good()) && (imageHighBit >= precision))
{
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertUint16(DCM_HighBit, OFstatic_cast(Uint16, precision-1));
}
// Number of Frames might have changed in case the previous value was wrong
if (result.good() && (numberOfFramesPresent || (imageFrames > 1)))
{
char numBuf[20];
OFStandard::snprintf(numBuf, sizeof(numBuf), "%ld", OFstatic_cast(long, imageFrames));
result = OFreinterpret_cast(DcmItem*, dataset)->putAndInsertString(DCM_NumberOfFrames, numBuf);
}
// Pixel Representation could be signed if lossless JPEG. For now, we just believe what we get.
}
delete jpeg;
}
}
}
}
}
}
// the following operations do not affect the Image Pixel Module
// but other modules such as SOP Common. We only perform these
// changes if we're on the main level of the dataset,
// which should always identify itself as dataset, not as item.
if (dataset->ident() == EVR_dataset)
{
DcmItem *ditem = OFreinterpret_cast(DcmItem*, dataset);
// create new SOP instance UID if codec parameters require so
if (result.good() && (djcp->getUIDCreation() == EUC_always))
result = DcmCodec::newInstance(ditem, NULL, NULL, NULL);
// set Lossy Image Compression to "01" (see DICOM part 3, C.7.6.1.1.5)
if (result.good() && (! isLosslessProcess())) result = ditem->putAndInsertString(DCM_LossyImageCompression, "01");
}
}
return result;
}
// the following macros make the source code more readable and easier to maintain
#define GET_AND_CHECK_UINT16_VALUE(tag, variable) \
if (result.good()) \
{ \
result = dataset->findAndGetUint16(tag, variable); \
if (result == EC_TagNotFound) \
{ \
DCMJPEG_WARN("mandatory element " << DcmTag(tag).getTagName() << " " << tag << " is missing"); \
result = EC_MissingAttribute; \
} \
else if ((result == EC_IllegalCall) || (result == EC_IllegalParameter)) \
{ \
DCMJPEG_WARN("no value for mandatory element " << DcmTag(tag).getTagName() << " " << tag); \
result = EC_MissingValue; \
} \
else if (result.bad()) \
DCMJPEG_WARN("cannot retrieve value of element " << DcmTag(tag).getTagName() << " " << tag << ": " << result.text()); \
}
#define GET_AND_CHECK_STRING_VALUE(tag, variable) \
if (result.good()) \
{ \
result = dataset->findAndGetOFString(tag, variable); \
if (result == EC_TagNotFound) \
{ \
DCMJPEG_WARN("mandatory element " << DcmTag(tag).getTagName() << " " << tag << " is missing"); \
result = EC_MissingAttribute; \
} \
else if (result.bad()) \
{ \
DCMJPEG_WARN("cannot retrieve value of element " << DcmTag(tag).getTagName() << " " << tag << ": " << result.text()); \
} \
else if (variable.empty()) \
{ \
DCMJPEG_WARN("no value for mandatory element " << DcmTag(tag).getTagName() << " " << tag); \
result = EC_MissingValue; \
} \
}
OFCondition DJCodecDecoder::decodeFrame(
const DcmRepresentationParameter *fromParam,
DcmPixelSequence *fromPixSeq,
const DcmCodecParameter *cp,
DcmItem *dataset,
Uint32 frameNo,
Uint32& startFragment,
void *buffer,
Uint32 bufSize,
OFString& decompressedColorModel) const
{
OFCondition result = EC_Normal;
// assume we can cast the codec parameter to what we need
const DJCodecParameter *djcp = OFreinterpret_cast(const DJCodecParameter*, cp);
if (dataset == NULL)
result = EC_IllegalParameter;
else if ((dataset->ident() != EVR_dataset) && (dataset->ident() != EVR_item))
result = EC_CorruptedData;
else
{
Uint16 imageSamplesPerPixel = 0;
Uint16 imageRows = 0;
Uint16 imageColumns = 0;
Sint32 imageFrames = 1;
Uint16 imageBitsAllocated = 0;
Uint16 imageBitsStored = 0;
Uint16 imageHighBit = 0;
Uint16 planarConfig = 0;
OFString photometricInterpretation;
OFBool isSigned = OFFalse;
Uint16 pixelRep = 0; // needed to decline color conversion of signed pixel data to RGB
/* retrieve values from dataset (and warn if missing or empty) */
GET_AND_CHECK_UINT16_VALUE(DCM_SamplesPerPixel, imageSamplesPerPixel)
GET_AND_CHECK_UINT16_VALUE(DCM_Rows, imageRows)
GET_AND_CHECK_UINT16_VALUE(DCM_Columns, imageColumns)
GET_AND_CHECK_UINT16_VALUE(DCM_BitsAllocated, imageBitsAllocated)
GET_AND_CHECK_UINT16_VALUE(DCM_BitsStored, imageBitsStored)
GET_AND_CHECK_UINT16_VALUE(DCM_HighBit, imageHighBit)
GET_AND_CHECK_UINT16_VALUE(DCM_PixelRepresentation, pixelRep)
GET_AND_CHECK_STRING_VALUE(DCM_PhotometricInterpretation, photometricInterpretation)
if (imageSamplesPerPixel > 1)
{
GET_AND_CHECK_UINT16_VALUE(DCM_PlanarConfiguration, planarConfig);
}
isSigned = (pixelRep == 0) ? OFFalse : OFTrue;
// number of frames is an optional attribute - we don't mind if it isn't present.
if (result.good()) dataset->findAndGetSint32(DCM_NumberOfFrames, imageFrames);
EP_Interpretation dicomPI = DcmJpegHelper::getPhotometricInterpretation(dataset);
OFBool isYBR = OFFalse;
if ((dicomPI == EPI_YBR_Full)||(dicomPI == EPI_YBR_Full_422)||(dicomPI == EPI_YBR_Partial_422)) isYBR = OFTrue;
if (imageFrames < 1) imageFrames = 1; // default in case this attribute contains garbage
// determine the corresponding item (first fragment) for this frame
Uint32 currentItem = startFragment;
// if the user has provided this information, we trust him.
// If the user has passed a zero, try to find out ourselves.
if (currentItem == 0 && result.good())
{
result = determineStartFragment(frameNo, imageFrames, fromPixSeq, currentItem);
}
// book-keeping needed to clean-up memory the end of this routine
Uint32 firstFragmentUsed = currentItem;
Uint32 pastLastFragmentUsed = firstFragmentUsed;
// now access and decompress the frame starting at the item we have identified
if (result.good())
{
DcmPixelItem *pixItem = NULL;
Uint8 * jpegData = NULL;
result = fromPixSeq->getItem(pixItem, currentItem);
if (result.good())
{
size_t fragmentLength = pixItem->getLength();
result = pixItem->getUint8Array(jpegData);
if (result.good())
{
if (jpegData == NULL) result = EC_CorruptedData; // JPEG data stream is empty/absent
else
{
Uint8 precision = scanJpegDataForBitDepth(jpegData, OFstatic_cast(Uint32, fragmentLength));
if (precision == 0) result = EC_CannotChangeRepresentation; // something has gone wrong, bail out
else
{
Uint32 imageBytesAllocated = (precision > 8) ? sizeof(Uint16) : sizeof(Uint8);
Uint32 frameSize = imageBytesAllocated * imageRows * imageColumns * imageSamplesPerPixel;
// check for overflow
if (imageRows != 0 && frameSize / imageRows != (imageBytesAllocated * imageColumns * imageSamplesPerPixel))
{
DCMJPEG_WARN("cannot decompress image because uncompressed representation would exceed maximum possible size of PixelData attribute");
return EC_ElemLengthExceeds32BitField;
}
if (frameSize > bufSize) return EC_IllegalCall;
DJDecoder *jpeg = createDecoderInstance(fromParam, djcp, precision, isYBR);
if (jpeg == NULL) result = EC_MemoryExhausted;
else
{
if (isYBR && (imageBitsStored < imageBitsAllocated)) // check for a special case that is currently not handled properly
{
if (djcp->getDecompressionColorSpaceConversion() != EDC_never)
{
DCMJPEG_WARN("BitsStored < BitsAllocated for JPEG compressed image with YCbCr color model, color space conversion will probably not work properly");
DCMJPEG_DEBUG("workaround: use option --conv-never (for command line tools) or EDC_never (for the DJDecoderRegistration::registerCodecs() call)");
}
}
result = jpeg->init();
if (result.good())
{
result = EJ_Suspension;
while (EJ_Suspension == result)
{
result = fromPixSeq->getItem(pixItem, currentItem++);
if (result.good())
{
fragmentLength = pixItem->getLength();
result = pixItem->getUint8Array(jpegData);
if (result.good())
{
result = jpeg->decode(jpegData, OFstatic_cast(Uint32, fragmentLength), OFreinterpret_cast(Uint8*, buffer), OFstatic_cast(Uint32, frameSize), isSigned);
pastLastFragmentUsed = currentItem;
}
}
}
if (result.good())
{
// convert planar configuration to color by plane if necessary
if ((imageSamplesPerPixel == 3) && (planarConfig == 1))
{
if (precision > 8)
result = createPlanarConfigurationWord(OFreinterpret_cast(Uint16*, buffer), imageColumns, imageRows);
else result = createPlanarConfigurationByte(OFreinterpret_cast(Uint8*, buffer), imageColumns, imageRows);
}
}
if (result.good())
{
// decompression is complete, finally adjust byte order if necessary
if (jpeg->bytesPerSample() == 1) // we're writing bytes into words
{
result = swapIfNecessary(gLocalByteOrder, EBO_LittleEndian, OFreinterpret_cast(Uint16*, buffer), OFstatic_cast(Uint32, frameSize), sizeof(Uint16));
}
}
if (result.good())
{
// compression was successful. Now update output parameters
startFragment = pastLastFragmentUsed;
decompressedColorModel = photometricInterpretation; // this is the default
// now see if we have to change the photometric interpretation
// because the decompression has changed something
switch (jpeg->getDecompressedColorModel())
{
case EPI_Monochrome2:
decompressedColorModel = "MONOCHROME2";
break;
case EPI_YBR_Full:
decompressedColorModel = "YBR_FULL";
break;
case EPI_RGB:
decompressedColorModel = "RGB";
break;
default:
if ((dicomPI == EPI_YBR_Full_422)||(dicomPI == EPI_YBR_Partial_422))
{
// decompression always eliminates subsampling
decompressedColorModel = "YBR_FULL";
}
break;
}
}
delete jpeg;
/* remove all used fragments from memory */
while (firstFragmentUsed < pastLastFragmentUsed)
{
fromPixSeq->getItem(pixItem, firstFragmentUsed++);
pixItem->compact();
}
}
}
}
}
}
}
}
}
return result;
}
OFCondition DJCodecDecoder::encode(
const Uint16 * /* pixelData */,
const Uint32 /* length */,
const DcmRepresentationParameter * /* toRepParam */,
DcmPixelSequence * & /* pixSeq */,
const DcmCodecParameter * /* cp */,
DcmStack & /* objStack */,
OFBool& /* removeOldRep */) const
{
// we are a decoder only
return EC_IllegalCall;
}
OFCondition DJCodecDecoder::encode(
const E_TransferSyntax /* fromRepType */,
const DcmRepresentationParameter * /* fromRepParam */,
DcmPixelSequence * /* fromPixSeq */,
const DcmRepresentationParameter * /* toRepParam */,
DcmPixelSequence * & /* toPixSeq */,
const DcmCodecParameter * /* cp */,
DcmStack & /* objStack */,
OFBool& /* removeOldRep */) const
{
// we don't support re-coding for now
return EC_IllegalCall;
}
OFCondition DJCodecDecoder::determineDecompressedColorModel(
const DcmRepresentationParameter *fromParam,
DcmPixelSequence *fromPixSeq,
const DcmCodecParameter *cp,
DcmItem *dataset,
OFString &decompressedColorModel) const
{
OFCondition result = EC_CorruptedData;
if ((dataset != NULL) && (fromPixSeq != NULL))
{
// the first frame always starts with the second fragment
Uint32 startFragment = 1;
Uint32 bufSize = 0;
// determine size of uncompressed frame
if ((fromPixSeq->getUncompressedFrameSize(dataset, bufSize, OFFalse).good()) && (bufSize > 0))
{
// allocate temporary buffer for a single frame
Uint8 *buffer = new Uint8[bufSize];
if (buffer != NULL)
{
DCMJPEG_DEBUG("decompressing first frame to determine the decompressed color model");
// simple approach: decode first frame in order to determine the uncompressed color model
result = decodeFrame(fromParam, fromPixSeq, cp, dataset, 0 /* frameNo */, startFragment,
OFstatic_cast(void *, buffer), bufSize, decompressedColorModel);
} else
result = EC_MemoryExhausted;
delete[] buffer;
}
}
if (result.bad())
DCMJPEG_ERROR("can't decompress first frame: " << result.text());
return result;
}
Uint16 DJCodecDecoder::readUint16(const Uint8 *data)
{
return OFstatic_cast(Uint16, (OFstatic_cast(Uint16, *data) << 8) | OFstatic_cast(Uint16, *(data+1)));
}
Uint8 DJCodecDecoder::scanJpegDataForBitDepth(
const Uint8 *data,
const Uint32 fragmentLength)
{
// first, check whether there is any JPEG data at all
if (data == NULL) return 0;
Uint32 offset = 0;
while(offset+4 < fragmentLength)
{
switch(readUint16(data+offset))
{
case 0xffc0: // SOF_0: JPEG baseline
return data[offset+4];
/* break; */
case 0xffc1: // SOF_1: JPEG extended sequential DCT
return data[offset+4];
/* break; */
case 0xffc2: // SOF_2: JPEG progressive DCT
return data[offset+4];
/* break; */
case 0xffc3 : // SOF_3: JPEG lossless sequential
return data[offset+4];
/* break; */
case 0xffc5: // SOF_5: differential (hierarchical) extended sequential, Huffman
return data[offset+4];
/* break; */
case 0xffc6: // SOF_6: differential (hierarchical) progressive, Huffman
return data[offset+4];
/* break; */
case 0xffc7: // SOF_7: differential (hierarchical) lossless, Huffman
return data[offset+4];
/* break; */
case 0xffc8: // Reserved for JPEG extensions
offset += readUint16(data+offset+2)+2;
break;
case 0xffc9: // SOF_9: extended sequential, arithmetic
return data[offset+4];
/* break; */
case 0xffca: // SOF_10: progressive, arithmetic
return data[offset+4];
/* break; */
case 0xffcb: // SOF_11: lossless, arithmetic
return data[offset+4];
/* break; */
case 0xffcd: // SOF_13: differential (hierarchical) extended sequential, arithmetic
return data[offset+4];
/* break; */
case 0xffce: // SOF_14: differential (hierarchical) progressive, arithmetic
return data[offset+4];
/* break; */
case 0xffcf: // SOF_15: differential (hierarchical) lossless, arithmetic
return data[offset+4];
/* break; */
case 0xffc4: // DHT
offset += readUint16(data+offset+2)+2;
break;
case 0xffcc: // DAC
offset += readUint16(data+offset+2)+2;
break;
case 0xffd0: // RST m
case 0xffd1:
case 0xffd2:
case 0xffd3:
case 0xffd4:
case 0xffd5:
case 0xffd6:
case 0xffd7:
offset +=2;
break;
case 0xffd8: // SOI
offset +=2;
break;
case 0xffd9: // EOI
offset +=2;
break;
case 0xffda: // SOS
offset += readUint16(data+offset+2)+2;
break;
case 0xffdb: // DQT
offset += readUint16(data+offset+2)+2;
break;
case 0xffdc: // DNL
offset += readUint16(data+offset+2)+2;
break;
case 0xffdd: // DRI
offset += readUint16(data+offset+2)+2;
break;
case 0xffde: // DHP
offset += readUint16(data+offset+2)+2;
break;
case 0xffdf: // EXP
offset += readUint16(data+offset+2)+2;
break;
case 0xffe0: // APPn
case 0xffe1:
case 0xffe2:
case 0xffe3:
case 0xffe4:
case 0xffe5:
case 0xffe6:
case 0xffe7:
case 0xffe8:
case 0xffe9:
case 0xffea:
case 0xffeb:
case 0xffec:
case 0xffed:
case 0xffee:
case 0xffef:
offset += readUint16(data+offset+2)+2;
break;
case 0xfff0: // JPGn
case 0xfff1:
case 0xfff2:
case 0xfff3:
case 0xfff4:
case 0xfff5:
case 0xfff6:
case 0xfff7:
case 0xfff8:
case 0xfff9:
case 0xfffa:
case 0xfffb:
case 0xfffc:
case 0xfffd:
offset += readUint16(data+offset+2)+2;
break;
case 0xfffe: // COM
offset += readUint16(data+offset+2)+2;
break;
case 0xffff: // fill byte 0xff (skip one byte only)
offset += 1;
break;
case 0xff01: // TEM
break;
default:
if ((data[offset]==0xff) && (data[offset+1]>2) && (data[offset+1] <= 0xbf)) // RES reserved markers
{
offset += 2;
}
else
{
DCMJPEG_ERROR("found invalid marker in JPEG stream while scanning for bit depth: 0x"
<< STD_NAMESPACE hex << STD_NAMESPACE setfill('0')
<< STD_NAMESPACE setw(2) << OFstatic_cast(int, data[offset])
<< STD_NAMESPACE setw(2) << OFstatic_cast(int, data[offset+1])
<< STD_NAMESPACE dec << STD_NAMESPACE setfill(' '));
return 0; // syntax error, stop parsing
}
break;
}
} // while
return 0; // no SOF marker found
}
OFCondition DJCodecDecoder::createPlanarConfigurationByte(
Uint8 *imageFrame,
Uint16 columns,
Uint16 rows)
{
if (imageFrame == NULL) return EC_IllegalCall;
size_t numPixels = columns * rows;
if (numPixels == 0) return EC_IllegalCall;
Uint8 *buf = new Uint8[3*numPixels + 3];
if (buf)
{
memcpy(buf, imageFrame, 3*numPixels);
Uint8 *s = buf; // source
Uint8 *r = imageFrame; // red plane
Uint8 *g = imageFrame + numPixels; // green plane
Uint8 *b = imageFrame + (2*numPixels); // blue plane
for (size_t i=numPixels; i; i--)
{
*r++ = *s++;
*g++ = *s++;
*b++ = *s++;
}
delete[] buf;
} else return EC_MemoryExhausted;
return EC_Normal;
}
OFCondition DJCodecDecoder::createPlanarConfigurationWord(
Uint16 *imageFrame,
Uint16 columns,
Uint16 rows)
{
if (imageFrame == NULL) return EC_IllegalCall;
size_t numPixels = columns * rows;
if (numPixels == 0) return EC_IllegalCall;
Uint16 *buf = new Uint16[3*numPixels + 3];
if (buf)
{
memcpy(buf, imageFrame, 3*numPixels*sizeof(Uint16));
Uint16 *s = buf; // source
Uint16 *r = imageFrame; // red plane
Uint16 *g = imageFrame + numPixels; // green plane
Uint16 *b = imageFrame + (2*numPixels); // blue plane
for (size_t i=numPixels; i; i--)
{
*r++ = *s++;
*g++ = *s++;
*b++ = *s++;
}
delete[] buf;
} else return EC_MemoryExhausted;
return EC_Normal;
}
/* This method examines if a given image requires color-by-plane planar configuration
* depending on SOP Class UID (DICOM IOD) and photometric interpretation.
* All SOP classes defined in the 2001 edition of the DICOM standard or earlier
* are handled correctly.
*/
OFBool DJCodecDecoder::requiresPlanarConfiguration(
const char *sopClassUID,
EP_Interpretation photometricInterpretation)
{
if (sopClassUID)
{
OFString sopClass(sopClassUID);
// Hardcopy Color Image always requires color-by-plane
if (sopClass == UID_RETIRED_HardcopyColorImageStorage) return OFTrue;
// The 1996 Ultrasound Image IODs require color-by-plane if color model is YBR_FULL.
if (photometricInterpretation == EPI_YBR_Full)
{
if ((sopClass == UID_UltrasoundMultiframeImageStorage)
||(sopClass == UID_UltrasoundImageStorage)) return OFTrue;
}
}
return OFFalse;
}
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