internal static void Decode(
DicomPixelData oldPixelData,
DicomPixelData newPixelData,
DicomJpegLsParams parameters)
{
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
var jpegData = oldPixelData.GetFrame(frame);
var frameSize = newPixelData.UncompressedFrameSize;
if ((frameSize & 1) == 1)
{
++frameSize;
}
var frameData = new byte[frameSize];
string errorMessage;
var err = JpegLs.Decode(frameData, jpegData.Data, null, out errorMessage);
if (err != ApiResult.OK)
{
throw new InvalidOperationException(GetErrorMessage(err, errorMessage));
}
newPixelData.AddFrame(new MemoryByteBuffer(frameData));
}
}
internal static void Encode(
DicomPixelData oldPixelData,
DicomPixelData newPixelData,
DicomJpegLsParams parameters)
{
if (oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrFull422 ||
oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrPartial422 ||
oldPixelData.PhotometricInterpretation == PhotometricInterpretation.YbrPartial420)
{
throw new InvalidOperationException(
"Photometric Interpretation '{oldPixelData.PhotometricInterpretation}' not supported by JPEG-LS encoder");
}
var jparameters = new JlsParameters
{
width = oldPixelData.Width,
height = oldPixelData.Height,
bitsPerSample = oldPixelData.BitsStored,
stride = oldPixelData.BytesAllocated * oldPixelData.Width * oldPixelData.SamplesPerPixel,
components = oldPixelData.SamplesPerPixel,
interleaveMode = oldPixelData.SamplesPerPixel == 1
? InterleaveMode.None
: oldPixelData.PlanarConfiguration == PlanarConfiguration.Interleaved
? InterleaveMode.Sample
: InterleaveMode.Line,
colorTransformation = ColorTransformation.None
};
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
var frameData = oldPixelData.GetFrame(frame);
// assume compressed frame will be smaller than original
var jpegData = new byte[frameData.Size];
ulong jpegDataSize;
string errorMessage;
var err = JpegLs.Encode(jpegData, frameData.Data, jparameters, out jpegDataSize, out errorMessage);
if (err != ApiResult.OK)
{
throw new InvalidOperationException(GetErrorMessage(err, errorMessage));
}
Array.Resize(ref jpegData, (int)jpegDataSize + ((jpegDataSize & 1) == 1 ? 1 : 0));
newPixelData.AddFrame(new MemoryByteBuffer(jpegData));
}
}
/// <summary>
/// The JPEG-LS decoding function
/// </summary>
/// <param name="oldPixelData">The old pixel data</param>
/// <param name="newPixelData">The new pixel data</param>
/// <param name="parameters">The compression parameters</param>
public override void Decode(DicomPixelData oldPixelData, DicomPixelData newPixelData,
DicomCodecParams parameters)
{
for (var frame = 0; frame < oldPixelData.NumberOfFrames; frame++)
{
var jpegLsData = oldPixelData.GetFrame(frame);
var message = String.Empty;
var jpegLsParams = new JlsParameters();
var frameData = new byte[newPixelData.UncompressedFrameSize];
var err = JpegLs.Decode(frameData, jpegLsData.Data, jpegLsParams, out message);
var buffer = frameData.Length >= 1 * 1024 * 1024 || oldPixelData.NumberOfFrames > 1
? (IByteBuffer) new TempFileBuffer(frameData)
: new MemoryByteBuffer(frameData);
newPixelData.AddFrame(EvenLengthBuffer.Create(buffer));
}
}
