/*
- Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of libdcp.
*/
+/** @file src/j2k.cc
+ * @brief Methods to encode and decode JPEG2000
+ */
+
+
#include "array_data.h"
#include "j2k.h"
#include "exceptions.h"
#include <cmath>
#include <iostream>
+
using std::min;
using std::pow;
using std::string;
using boost::shared_array;
using namespace dcp;
+
shared_ptr<dcp::OpenJPEGImage>
dcp::decompress_j2k (ArrayData data, int reduce)
{
return dcp::decompress_j2k (data.data(), data.size(), reduce);
}
+
#ifdef LIBDCP_OPENJPEG2
class ReadBuffer
OPJ_SIZE_T _offset;
};
+
static OPJ_SIZE_T
read_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
{
return reinterpret_cast<ReadBuffer*>(data)->read (buffer, nb_bytes);
}
+
static void
read_free_function (void* data)
{
throw MiscError (msg);
}
-/** Decompress a JPEG2000 image to a bitmap.
- * @param data JPEG2000 data.
- * @param size Size of data in bytes.
- * @param reduce A power of 2 by which to reduce the size of the decoded image;
- * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
- * 1 reduces by (2^1 == 2), ie halving the size of the image.
- * This is useful for scaling 4K DCP images down to 2K.
- * @return OpenJPEGImage.
- */
+
shared_ptr<dcp::OpenJPEGImage>
dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
{
0x20
};
- OPJ_CODEC_FORMAT format = OPJ_CODEC_J2K;
+ auto format = OPJ_CODEC_J2K;
if (size >= int (sizeof (jp2_magic)) && memcmp (data, jp2_magic, sizeof (jp2_magic)) == 0) {
format = OPJ_CODEC_JP2;
}
- opj_codec_t* decoder = opj_create_decompress (format);
+ auto decoder = opj_create_decompress (format);
if (!decoder) {
boost::throw_exception (ReadError ("could not create JPEG2000 decompresser"));
}
parameters.cp_reduce = reduce;
opj_setup_decoder (decoder, ¶meters);
- opj_stream_t* stream = opj_stream_default_create (OPJ_TRUE);
+ auto stream = opj_stream_default_create (OPJ_TRUE);
if (!stream) {
throw MiscError ("could not create JPEG2000 stream");
}
opj_set_error_handler(decoder, decompress_error_callback, 00);
opj_stream_set_read_function (stream, read_function);
- ReadBuffer* buffer = new ReadBuffer (data, size);
+ auto buffer = new ReadBuffer (data, size);
opj_stream_set_user_data (stream, buffer, read_free_function);
opj_stream_set_user_data_length (stream, size);
image->y1 = rint (float(image->y1) / pow (2.0f, reduce));
return shared_ptr<OpenJPEGImage> (new OpenJPEGImage (image));
}
+
#endif
+
#ifdef LIBDCP_OPENJPEG1
-/** Decompress a JPEG2000 image to a bitmap.
- * @param data JPEG2000 data.
- * @param size Size of data in bytes.
- * @param reduce A power of 2 by which to reduce the size of the decoded image;
- * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
- * 1 reduces by (2^1 == 2), ie halving the size of the image.
- * This is useful for scaling 4K DCP images down to 2K.
- * @return XYZ image.
- */
+
shared_ptr<dcp::OpenJPEGImage>
dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
{
- opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
+ auto decoder = opj_create_decompress (CODEC_J2K);
opj_dparameters_t parameters;
opj_set_default_decoder_parameters (¶meters);
parameters.cp_reduce = reduce;
opj_setup_decoder (decoder, ¶meters);
- opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
- opj_image_t* image = opj_decode (decoder, cio);
+ auto cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
+ auto image = opj_decode (decoder, cio);
if (!image) {
opj_destroy_decompress (decoder);
opj_cio_close (cio);
}
#endif
+
#ifdef LIBDCP_OPENJPEG2
+
class WriteBuffer
{
public:
/* XXX: is there a better strategy for this? */
#define MAX_J2K_SIZE (1024 * 1024 * 2)
WriteBuffer ()
- : _data (shared_array<uint8_t> (new uint8_t[MAX_J2K_SIZE]), MAX_J2K_SIZE)
+ : _data (shared_array<uint8_t>(new uint8_t[MAX_J2K_SIZE]), MAX_J2K_SIZE)
, _offset (0)
{
_data.set_size (0);
DCP_ASSERT ((_offset + nb_bytes) < MAX_J2K_SIZE);
memcpy (_data.data() + _offset, buffer, nb_bytes);
_offset += nb_bytes;
- if (_offset > OPJ_SIZE_T (_data.size())) {
+ if (_offset > OPJ_SIZE_T(_data.size())) {
_data.set_size (_offset);
}
return nb_bytes;
OPJ_SIZE_T _offset;
};
+
static OPJ_SIZE_T
write_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
{
- return reinterpret_cast<WriteBuffer*>(data)->write (buffer, nb_bytes);
+ return reinterpret_cast<WriteBuffer*>(data)->write(buffer, nb_bytes);
}
+
static void
write_free_function (void* data)
{
delete reinterpret_cast<WriteBuffer*>(data);
}
+
static OPJ_BOOL
seek_function (OPJ_OFF_T nb_bytes, void* data)
{
- return reinterpret_cast<WriteBuffer*>(data)->seek (nb_bytes);
+ return reinterpret_cast<WriteBuffer*>(data)->seek(nb_bytes);
+
}
-/** @xyz Picture to compress. Parts of xyz's data WILL BE OVERWRITTEN by libopenjpeg so xyz cannot be re-used
- * after this call; see opj_j2k_encode where if l_reuse_data is false it will set l_tilec->data = l_img_comp->data.
- */
+
ArrayData
dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frames_per_second, bool threed, bool fourk, string comment)
{
/* get a J2K compressor handle */
- opj_codec_t* encoder = opj_create_compress (OPJ_CODEC_J2K);
- if (encoder == 0) {
+ auto encoder = opj_create_compress (OPJ_CODEC_J2K);
+ if (encoder == nullptr) {
throw MiscError ("could not create JPEG2000 encoder");
}
/* Setup the encoder parameters using the current image and user parameters */
opj_setup_encoder (encoder, ¶meters, xyz->opj_image());
- opj_stream_t* stream = opj_stream_default_create (OPJ_FALSE);
+ auto stream = opj_stream_default_create (OPJ_FALSE);
if (!stream) {
opj_destroy_codec (encoder);
free (parameters.cp_comment);
return enc;
}
+
#endif
+
#ifdef LIBDCP_OPENJPEG1
+
ArrayData
dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frames_per_second, bool threed, bool fourk)
{
int const max_comp_size = max_cs_len / 1.25;
/* get a J2K compressor handle */
- opj_cinfo_t* cinfo = opj_create_compress (CODEC_J2K);
- if (cinfo == 0) {
+ auto cinfo = opj_create_compress (CODEC_J2K);
+ if (cinfo == nullptr) {
throw MiscError ("could not create JPEG2000 encoder");
}
cinfo->event_mgr = 0;
/* Setup the encoder parameters using the current image and user parameters */
- opj_setup_encoder (cinfo, ¶meters, xyz->opj_image ());
+ opj_setup_encoder (cinfo, ¶meters, xyz->opj_image());
- opj_cio_t* cio = opj_cio_open ((opj_common_ptr) cinfo, 0, 0);
- if (cio == 0) {
+ auto cio = opj_cio_open ((opj_common_ptr) cinfo, 0, 0);
+ if (cio == nullptr) {
opj_destroy_compress (cinfo);
throw MiscError ("could not open JPEG2000 stream");
}
projects / libdcp.git / blobdiff