dirac.c
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1 /*
2  * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
3  * Copyright (C) 2009 David Conrad
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 
28 #include "libavutil/imgutils.h"
29 #include "dirac.h"
30 #include "avcodec.h"
31 #include "golomb.h"
32 #include "mpeg12data.h"
33 
34 // defaults for source parameters
36  { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
37  { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
38  { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
39  { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
40  { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
41  { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
42  { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
43  { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
44  { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
45 
46  { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
47  { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
48  { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
49  { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
50  { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
51  { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
52  { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
53  { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
54 
55  { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
56  { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
57  { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
58  { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
59 };
60 
62  {1, 1},
63  {10, 11},
64  {12, 11},
65  {40, 33},
66  {16, 11},
67  {4, 3},
68 };
69 
70 static const AVRational dirac_frame_rate[] = {
71  {15000, 1001},
72  {25, 2},
73 };
74 
75 static const struct {
76  uint8_t bitdepth;
78 } pixel_range_presets[] = {
79  {8, AVCOL_RANGE_JPEG},
80  {8, AVCOL_RANGE_MPEG},
81  {10, AVCOL_RANGE_MPEG},
82  {12, AVCOL_RANGE_MPEG},
83 };
84 
85 static const enum AVColorPrimaries dirac_primaries[] = {
89 };
90 
91 static const struct {
95 } dirac_color_presets[] = {
101 };
102 
103 static const enum PixelFormat dirac_pix_fmt[2][3] = {
106 };
107 
109  dirac_source_params *source)
110 {
112  unsigned luma_depth = 8, luma_offset = 16;
113  int idx;
114 
115  if (get_bits1(gb)) {
116  source->width = svq3_get_ue_golomb(gb);
117  source->height = svq3_get_ue_golomb(gb);
118  }
119 
120  // chroma subsampling
121  if (get_bits1(gb))
122  source->chroma_format = svq3_get_ue_golomb(gb);
123  if (source->chroma_format > 2) {
124  av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
125  source->chroma_format);
126  return -1;
127  }
128 
129  if (get_bits1(gb))
130  source->interlaced = svq3_get_ue_golomb(gb);
131  if (source->interlaced > 1)
132  return -1;
133 
134  // frame rate
135  if (get_bits1(gb)) {
136  source->frame_rate_index = svq3_get_ue_golomb(gb);
137 
138  if (source->frame_rate_index > 10)
139  return -1;
140 
141  if (!source->frame_rate_index) {
142  frame_rate.num = svq3_get_ue_golomb(gb);
143  frame_rate.den = svq3_get_ue_golomb(gb);
144  }
145  }
146  if (source->frame_rate_index > 0) {
147  if (source->frame_rate_index <= 8)
148  frame_rate = avpriv_frame_rate_tab[source->frame_rate_index];
149  else
150  frame_rate = dirac_frame_rate[source->frame_rate_index-9];
151  }
152  av_reduce(&avctx->time_base.num, &avctx->time_base.den,
153  frame_rate.den, frame_rate.num, 1<<30);
154 
155  // aspect ratio
156  if (get_bits1(gb)) {
158 
159  if (source->aspect_ratio_index > 6)
160  return -1;
161 
162  if (!source->aspect_ratio_index) {
165  }
166  }
167  if (source->aspect_ratio_index > 0)
168  avctx->sample_aspect_ratio =
169  dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
170 
171  if (get_bits1(gb)) {
172  source->clean_width = svq3_get_ue_golomb(gb);
173  source->clean_height = svq3_get_ue_golomb(gb);
176  }
177 
178  // Override signal range.
179  if (get_bits1(gb)) {
181 
182  if (source->pixel_range_index > 4)
183  return -1;
184 
185  // This assumes either fullrange or MPEG levels only
186  if (!source->pixel_range_index) {
187  luma_offset = svq3_get_ue_golomb(gb);
188  luma_depth = av_log2(svq3_get_ue_golomb(gb))+1;
189  svq3_get_ue_golomb(gb); // chroma offset
190  svq3_get_ue_golomb(gb); // chroma excursion
191 
192  avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
193  }
194  }
195  if (source->pixel_range_index > 0) {
196  idx = source->pixel_range_index-1;
197  luma_depth = pixel_range_presets[idx].bitdepth;
198  avctx->color_range = pixel_range_presets[idx].color_range;
199  }
200 
201  if (luma_depth > 8)
202  av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
203 
204  avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
205 
206  // color spec
207  if (get_bits1(gb)) {
208  idx = source->color_spec_index = svq3_get_ue_golomb(gb);
209 
210  if (source->color_spec_index > 4)
211  return -1;
212 
213  avctx->color_primaries = dirac_color_presets[idx].color_primaries;
214  avctx->colorspace = dirac_color_presets[idx].colorspace;
215  avctx->color_trc = dirac_color_presets[idx].color_trc;
216 
217  if (!source->color_spec_index) {
218  if (get_bits1(gb)) {
219  idx = svq3_get_ue_golomb(gb);
220  if (idx < 3)
221  avctx->color_primaries = dirac_primaries[idx];
222  }
223 
224  if (get_bits1(gb)) {
225  idx = svq3_get_ue_golomb(gb);
226  if (!idx)
227  avctx->colorspace = AVCOL_SPC_BT709;
228  else if (idx == 1)
229  avctx->colorspace = AVCOL_SPC_BT470BG;
230  }
231 
232  if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
233  avctx->color_trc = AVCOL_TRC_BT709;
234  }
235  } else {
236  idx = source->color_spec_index;
237  avctx->color_primaries = dirac_color_presets[idx].color_primaries;
238  avctx->colorspace = dirac_color_presets[idx].colorspace;
239  avctx->color_trc = dirac_color_presets[idx].color_trc;
240  }
241 
242  return 0;
243 }
244 
246  dirac_source_params *source)
247 {
248  unsigned version_major;
249  unsigned video_format, picture_coding_mode;
250 
251  version_major = svq3_get_ue_golomb(gb);
252  svq3_get_ue_golomb(gb); /* version_minor */
253  avctx->profile = svq3_get_ue_golomb(gb);
254  avctx->level = svq3_get_ue_golomb(gb);
255  video_format = svq3_get_ue_golomb(gb);
256 
257  if (version_major < 2)
258  av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
259  else if (version_major > 2)
260  av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
261 
262  if (video_format > 20)
263  return -1;
264 
265  // Fill in defaults for the source parameters.
266  *source = dirac_source_parameters_defaults[video_format];
267 
268  // Override the defaults.
269  if (parse_source_parameters(avctx, gb, source))
270  return -1;
271 
272  if (av_image_check_size(source->width, source->height, 0, avctx))
273  return -1;
274 
275  avcodec_set_dimensions(avctx, source->width, source->height);
276 
277  // currently only used to signal field coding
278  picture_coding_mode = svq3_get_ue_golomb(gb);
279  if (picture_coding_mode != 0) {
280  av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
281  picture_coding_mode);
282  return -1;
283  }
284  return 0;
285 }