2 Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include "exceptions.h"
22 #include "openjpeg_image.h"
24 #include "dcp_assert.h"
25 #include "compose.hpp"
31 using boost::shared_ptr;
32 using boost::shared_array;
35 shared_ptr<dcp::OpenJPEGImage>
36 dcp::decompress_j2k (Data data, int reduce)
38 return dcp::decompress_j2k (data.data().get(), data.size(), reduce);
44 ReadBuffer (uint8_t* data, int64_t size)
50 OPJ_SIZE_T read (void* buffer, OPJ_SIZE_T nb_bytes)
52 int64_t N = min (nb_bytes, _size - _offset);
53 memcpy (buffer, _data + _offset, N);
65 read_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
67 return reinterpret_cast<ReadBuffer*>(data)->read (buffer, nb_bytes);
71 read_free_function (void* data)
73 delete reinterpret_cast<ReadBuffer*>(data);
76 /** Decompress a JPEG2000 image to a bitmap.
77 * @param data JPEG2000 data.
78 * @param size Size of data in bytes.
79 * @param reduce A power of 2 by which to reduce the size of the decoded image;
80 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
81 * 1 reduces by (2^1 == 2), ie halving the size of the image.
82 * This is useful for scaling 4K DCP images down to 2K.
83 * @return OpenJPEGImage.
85 shared_ptr<dcp::OpenJPEGImage>
86 dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
88 uint8_t const jp2_magic[] = {
99 OPJ_CODEC_FORMAT format = OPJ_CODEC_J2K;
100 if (size >= int (sizeof (jp2_magic)) && memcmp (data, jp2_magic, sizeof (jp2_magic)) == 0) {
101 format = OPJ_CODEC_JP2;
104 opj_codec_t* decoder = opj_create_decompress (format);
106 boost::throw_exception (DCPReadError ("could not create JPEG2000 decompresser"));
108 opj_dparameters_t parameters;
109 opj_set_default_decoder_parameters (¶meters);
110 parameters.cp_reduce = reduce;
111 opj_setup_decoder (decoder, ¶meters);
113 opj_stream_t* stream = opj_stream_default_create (OPJ_TRUE);
115 throw MiscError ("could not create JPEG2000 stream");
118 opj_stream_set_read_function (stream, read_function);
119 ReadBuffer* buffer = new ReadBuffer (data, size);
120 opj_stream_set_user_data (stream, buffer, read_free_function);
121 opj_stream_set_user_data_length (stream, size);
123 opj_image_t* image = 0;
124 opj_read_header (stream, decoder, &image);
125 if (opj_decode (decoder, stream, image) == OPJ_FALSE) {
126 opj_destroy_codec (decoder);
127 opj_stream_destroy (stream);
128 if (format == OPJ_CODEC_J2K) {
129 boost::throw_exception (DCPReadError (String::compose ("could not decode JPEG2000 codestream of %1 bytes.", size)));
131 boost::throw_exception (DCPReadError (String::compose ("could not decode JP2 file of %1 bytes.", size)));
135 opj_destroy_codec (decoder);
136 opj_stream_destroy (stream);
138 image->x1 = rint (float(image->x1) / pow (2, reduce));
139 image->y1 = rint (float(image->y1) / pow (2, reduce));
140 return shared_ptr<OpenJPEGImage> (new OpenJPEGImage (image));
146 /* XXX: is there a better strategy for this? */
147 #define MAX_J2K_SIZE (1024 * 1024 * 2)
149 : _data (shared_array<uint8_t> (new uint8_t[MAX_J2K_SIZE]), MAX_J2K_SIZE)
153 OPJ_SIZE_T write (void* buffer, OPJ_SIZE_T nb_bytes)
155 DCP_ASSERT ((_offset + nb_bytes) < MAX_J2K_SIZE);
156 memcpy (_data.data().get() + _offset, buffer, nb_bytes);
171 write_function (void* buffer, OPJ_SIZE_T nb_bytes, void* data)
173 return reinterpret_cast<WriteBuffer*>(data)->write (buffer, nb_bytes);
177 write_free_function (void* data)
179 delete reinterpret_cast<WriteBuffer*>(data);
183 dcp::compress_j2k (shared_ptr<const OpenJPEGImage> xyz, int bandwidth, int frames_per_second, bool threed, bool fourk)
185 /* XXX: should probably use opj_set_*_handler */
187 /* Set the max image and component sizes based on frame_rate */
188 int max_cs_len = ((float) bandwidth) / 8 / frames_per_second;
190 /* In 3D we have only half the normal bandwidth per eye */
193 int const max_comp_size = max_cs_len / 1.25;
195 /* get a J2K compressor handle */
196 opj_codec_t* encoder = opj_create_compress (OPJ_CODEC_J2K);
198 throw MiscError ("could not create JPEG2000 encoder");
201 /* Set encoding parameters to default values */
202 opj_cparameters_t parameters;
203 opj_set_default_encoder_parameters (¶meters);
205 /* Set default cinema parameters */
206 parameters.tile_size_on = OPJ_FALSE;
207 parameters.cp_tdx = 1;
208 parameters.cp_tdy = 1;
211 parameters.tp_flag = 'C';
212 parameters.tp_on = 1;
214 /* Tile and Image shall be at (0,0) */
215 parameters.cp_tx0 = 0;
216 parameters.cp_ty0 = 0;
217 parameters.image_offset_x0 = 0;
218 parameters.image_offset_y0 = 0;
220 /* Codeblock size = 32x32 */
221 parameters.cblockw_init = 32;
222 parameters.cblockh_init = 32;
223 parameters.csty |= 0x01;
225 /* The progression order shall be CPRL */
226 parameters.prog_order = OPJ_CPRL;
229 parameters.roi_compno = -1;
231 parameters.subsampling_dx = 1;
232 parameters.subsampling_dy = 1;
235 parameters.irreversible = 1;
237 parameters.tcp_rates[0] = 0;
238 parameters.tcp_numlayers++;
239 parameters.cp_disto_alloc = 1;
240 parameters.cp_rsiz = fourk ? OPJ_CINEMA4K : OPJ_CINEMA2K;
242 parameters.numpocs = 2;
243 parameters.POC[0].tile = 1;
244 parameters.POC[0].resno0 = 0;
245 parameters.POC[0].compno0 = 0;
246 parameters.POC[0].layno1 = 1;
247 parameters.POC[0].resno1 = parameters.numresolution - 1;
248 parameters.POC[0].compno1 = 3;
249 parameters.POC[0].prg1 = OPJ_CPRL;
250 parameters.POC[1].tile = 1;
251 parameters.POC[1].resno0 = parameters.numresolution - 1;
252 parameters.POC[1].compno0 = 0;
253 parameters.POC[1].layno1 = 1;
254 parameters.POC[1].resno1 = parameters.numresolution;
255 parameters.POC[1].compno1 = 3;
256 parameters.POC[1].prg1 = OPJ_CPRL;
259 parameters.cp_comment = strdup ("libdcp");
260 parameters.cp_cinema = fourk ? OPJ_CINEMA4K_24 : OPJ_CINEMA2K_24;
262 /* 3 components, so use MCT */
263 parameters.tcp_mct = 1;
266 parameters.max_comp_size = max_comp_size;
267 parameters.tcp_rates[0] = ((float) (3 * xyz->size().width * xyz->size().height * 12)) / (max_cs_len * 8);
269 /* Setup the encoder parameters using the current image and user parameters */
270 opj_setup_encoder (encoder, ¶meters, xyz->opj_image());
272 opj_stream_t* stream = opj_stream_default_create (OPJ_FALSE);
274 throw MiscError ("could not create JPEG2000 stream");
277 opj_stream_set_write_function (stream, write_function);
278 WriteBuffer* buffer = new WriteBuffer ();
279 opj_stream_set_user_data (stream, buffer, write_free_function);
281 if (!opj_start_compress (encoder, xyz->opj_image(), stream)) {
282 throw MiscError ("could not start JPEG2000 encoding");
285 if (!opj_encode (encoder, stream)) {
286 opj_destroy_codec (encoder);
287 opj_stream_destroy (stream);
288 throw MiscError ("JPEG2000 encoding failed");
291 if (!opj_end_compress (encoder, stream)) {
292 throw MiscError ("could not end JPEG2000 encoding");
295 Data enc (buffer->data ());
297 free (parameters.cp_comment);
298 opj_destroy_codec (encoder);
299 opj_stream_destroy (stream);