libopenjpeg.c
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1 /*
2  * JPEG 2000 decoding support via OpenJPEG
3  * Copyright (c) 2009 Jaikrishnan Menon <realityman@gmx.net>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #include "libavutil/imgutils.h"
28 #include "avcodec.h"
29 #include "libavutil/intreadwrite.h"
30 #include "thread.h"
31 #define OPJ_STATIC
32 #include <openjpeg.h>
33 
34 #define JP2_SIG_TYPE 0x6A502020
35 #define JP2_SIG_VALUE 0x0D0A870A
36 
37 typedef struct {
38  opj_dparameters_t dec_params;
41 
42 static int check_image_attributes(opj_image_t *image)
43 {
44  return image->comps[0].dx == image->comps[1].dx &&
45  image->comps[1].dx == image->comps[2].dx &&
46  image->comps[0].dy == image->comps[1].dy &&
47  image->comps[1].dy == image->comps[2].dy &&
48  image->comps[0].prec == image->comps[1].prec &&
49  image->comps[1].prec == image->comps[2].prec;
50 }
51 
53 {
54  LibOpenJPEGContext *ctx = avctx->priv_data;
55 
56  opj_set_default_decoder_parameters(&ctx->dec_params);
57  avctx->coded_frame = &ctx->image;
58  return 0;
59 }
60 
62 {
63  LibOpenJPEGContext *ctx = avctx->priv_data;
64 
65  avctx->coded_frame = &ctx->image;
66  return 0;
67 }
68 
70  void *data, int *data_size,
71  AVPacket *avpkt)
72 {
73  uint8_t *buf = avpkt->data;
74  int buf_size = avpkt->size;
75  LibOpenJPEGContext *ctx = avctx->priv_data;
76  AVFrame *picture = &ctx->image, *output = data;
77  opj_dinfo_t *dec;
78  opj_cio_t *stream;
79  opj_image_t *image;
80  int width, height, has_alpha = 0, ret = -1;
81  int x, y, index;
82  uint8_t *img_ptr;
83  int adjust[4];
84 
85  *data_size = 0;
86 
87  // Check if input is a raw jpeg2k codestream or in jp2 wrapping
88  if((AV_RB32(buf) == 12) &&
89  (AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
90  (AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
91  dec = opj_create_decompress(CODEC_JP2);
92  } else {
93  // If the AVPacket contains a jp2c box, then skip to
94  // the starting byte of the codestream.
95  if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
96  buf += 8;
97  dec = opj_create_decompress(CODEC_J2K);
98  }
99 
100  if(!dec) {
101  av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
102  return -1;
103  }
104  opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
105 
106  ctx->dec_params.cp_limit_decoding = LIMIT_TO_MAIN_HEADER;
107  // Tie decoder with decoding parameters
108  opj_setup_decoder(dec, &ctx->dec_params);
109  stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
110  if(!stream) {
111  av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
112  opj_destroy_decompress(dec);
113  return -1;
114  }
115 
116  // Decode the header only
117  image = opj_decode_with_info(dec, stream, NULL);
118  opj_cio_close(stream);
119  if(!image) {
120  av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
121  opj_destroy_decompress(dec);
122  return -1;
123  }
124  width = image->x1 - image->x0;
125  height = image->y1 - image->y0;
126  if(av_image_check_size(width, height, 0, avctx) < 0) {
127  av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
128  goto done;
129  }
130  avcodec_set_dimensions(avctx, width, height);
131 
132  switch(image->numcomps)
133  {
134  case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
135  break;
136  case 3: if(check_image_attributes(image)) {
137  avctx->pix_fmt = PIX_FMT_RGB24;
138  } else {
139  avctx->pix_fmt = PIX_FMT_GRAY8;
140  av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
141  }
142  break;
143  case 4: has_alpha = 1;
144  avctx->pix_fmt = PIX_FMT_RGBA;
145  break;
146  default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
147  goto done;
148  }
149 
150  if(picture->data[0])
151  ff_thread_release_buffer(avctx, picture);
152 
153  if(ff_thread_get_buffer(avctx, picture) < 0){
154  av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed\n");
155  return -1;
156  }
157 
158  ff_thread_finish_setup(avctx);
159 
160  ctx->dec_params.cp_limit_decoding = NO_LIMITATION;
161  ctx->dec_params.cp_reduce = avctx->lowres;
162  // Tie decoder with decoding parameters
163  opj_setup_decoder(dec, &ctx->dec_params);
164  stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
165  if(!stream) {
166  av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
167  opj_destroy_decompress(dec);
168  return -1;
169  }
170 
171  // Decode the codestream
172  image = opj_decode_with_info(dec, stream, NULL);
173  opj_cio_close(stream);
174 
175  for(x = 0; x < image->numcomps; x++) {
176  adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
177  }
178 
179  for(y = 0; y < avctx->height; y++) {
180  index = y*avctx->width;
181  img_ptr = picture->data[0] + y*picture->linesize[0];
182  for(x = 0; x < avctx->width; x++, index++) {
183  *img_ptr++ = image->comps[0].data[index] >> adjust[0];
184  if(image->numcomps > 2 && check_image_attributes(image)) {
185  *img_ptr++ = image->comps[1].data[index] >> adjust[1];
186  *img_ptr++ = image->comps[2].data[index] >> adjust[2];
187  if(has_alpha)
188  *img_ptr++ = image->comps[3].data[index] >> adjust[3];
189  }
190  }
191  }
192 
193  *output = ctx->image;
194  *data_size = sizeof(AVPicture);
195  ret = buf_size;
196 
197 done:
198  opj_image_destroy(image);
199  opj_destroy_decompress(dec);
200  return ret;
201 }
202 
204 {
205  LibOpenJPEGContext *ctx = avctx->priv_data;
206 
207  if(ctx->image.data[0])
208  ff_thread_release_buffer(avctx, &ctx->image);
209  return 0 ;
210 }
211 
212 
214  .name = "libopenjpeg",
215  .type = AVMEDIA_TYPE_VIDEO,
216  .id = CODEC_ID_JPEG2000,
217  .priv_data_size = sizeof(LibOpenJPEGContext),
221  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
222  .max_lowres = 5,
223  .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
225 };