CHARLS_IMEXPORT(JLS_ERROR) JpegLsReadHeader(const void* compressedData, size_t compressedLength, JlsParameters* pparams)
{
return JpegLsReadHeaderStream(FromByteArray(compressedData, compressedLength), pparams);
}
void
JPEGLSCodec::decompress(const DataChunk &data)
{
ByteStreamInfo inStream = FromByteArray(data.Data, data.Size);
struct JlsParameters info;
JLS_ERROR err = JpegLsReadHeaderStream(inStream, &info);
if(err == OK)
{
const int width = info.width;
const int height = info.height;
assert(info.components == (_channels == JPEGLS_RGBA ? 4 : 3));
assert(info.colorTransform == COLORXFORM_NONE);
const PixelType pixType = (_depth == JPEGLS_8 ? UINT8 :
_depth == JPEGLS_10 ? UINT10 :
_depth == JPEGLS_12 ? UINT12 :
_depth == JPEGLS_16 ? UINT16 :
UINT8);
const size_t pixSize = PixelSize(pixType);
const unsigned int bitDepth = PixelBits(pixType);
assert(info.bitspersample == bitDepth);
const size_t pixelSize = (info.components * PixelSize(pixType));
const size_t rowBytes = (width * pixelSize);
const size_t bufSize = (height * rowBytes);
DataChunkPtr frameData = new DataChunk(bufSize);
char *buf = (char *)frameData->Data;
const Box2i dataW = dataWindow();
assert(width == (dataW.max.x - dataW.min.x + 1));
assert(height == (dataW.max.y - dataW.min.y + 1));
assert(dataW.min.x == 0);
assert(dataW.min.y == 0);
FrameBufferPtr frameBuffer = new FrameBuffer(dataW);
frameBuffer->insert("R", Slice(pixType, &buf[0 * pixSize], pixelSize, rowBytes));
frameBuffer->insert("G", Slice(pixType, &buf[1 * pixSize], pixelSize, rowBytes));
frameBuffer->insert("B", Slice(pixType, &buf[2 * pixSize], pixelSize, rowBytes));
if(info.components >= 4)
frameBuffer->insert("A", Slice(pixType, &buf[3 * pixSize], pixelSize, rowBytes));
frameBuffer->attachData(frameData);
ByteStreamInfo outStream = FromByteArray(frameData->Data, frameData->Size);
err = JpegLsDecodeStream(outStream, inStream, &info);
if(err == OK)
{
storeFrame(frameBuffer);
}
}
if(err != OK)
throw MoxMxf::ArgExc("JPEG-LS decompression error");
}