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#include "j2k_utils.h"
#include "libs/openjp2/openjpeg.h"
#include <cstring>
namespace image
{
Image decompress_j2k_openjp2(uint8_t *data, int length)
{
Image img;
// Init decoder parameters
opj_dparameters_t core;
memset(&core, 0, sizeof(opj_dparameters_t));
opj_set_default_decoder_parameters(&core);
// Set input buffer info struct
opj_buffer_info bufinfo;
bufinfo.buf = data;
bufinfo.cur = data;
bufinfo.len = length;
// Setup image, stream and codec
opj_image_t *image = NULL;
opj_stream_t *l_stream = opj_stream_create_buffer_stream(&bufinfo, true);
opj_codec_t *l_codec = opj_create_decompress(OPJ_CODEC_J2K);
// Check we could open the stream
if (!l_stream)
{
opj_destroy_codec(l_codec);
return img;
}
// Setup decoder
if (!opj_setup_decoder(l_codec, &core))
{
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
return img;
}
// Read header
if (!opj_read_header(l_stream, l_codec, &image))
{
opj_stream_destroy(l_stream);
opj_destroy_codec(l_codec);
opj_image_destroy(image);
return img;
}
// Decode image
if (!(opj_decode(l_codec, l_stream, image) &&
opj_end_decompress(l_codec, l_stream)))
{
opj_destroy_codec(l_codec);
opj_stream_destroy(l_stream);
opj_image_destroy(image);
return img;
}
// Parse into CImg
img = Image(16, image->x1, image->y1, 1);
for (int i = 0; i < int(image->x1 * image->y1); i++)
img.set(i, image->comps[0].data[i]);
// Free everything up
opj_destroy_codec(l_codec);
opj_stream_destroy(l_stream);
opj_image_destroy(image);
return img;
}
}
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