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 
61 /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
63  {1, 1},
64  {10, 11},
65  {12, 11},
66  {40, 33},
67  {16, 11},
68  {4, 3},
69 };
70 
71 /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
72  * Table 10.3 Available preset frame rate values
73  */
74 static const AVRational dirac_frame_rate[] = {
75  {15000, 1001},
76  {25, 2},
77 };
78 
79 /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
80  * range presets */
81 static const struct {
84 } pixel_range_presets[] = {
85  {8, AVCOL_RANGE_JPEG},
86  {8, AVCOL_RANGE_MPEG},
87  {10, AVCOL_RANGE_MPEG},
88  {12, AVCOL_RANGE_MPEG},
89 };
90 
91 static const enum AVColorPrimaries dirac_primaries[] = {
95 };
96 
97 static const struct {
101 } dirac_color_presets[] = {
107 };
108 
109 /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */
110 static const enum AVPixelFormat dirac_pix_fmt[2][3] = {
113 };
114 
115 /* [DIRAC_STD] 10.3 Parse Source Parameters.
116  * source_parameters(base_video_format) */
118  dirac_source_params *source)
119 {
120  AVRational frame_rate = {0,0};
121  unsigned luma_depth = 8, luma_offset = 16;
122  int idx;
123 
124  /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
125  /* [DIRAC_STD] custom_dimensions_flag */
126  if (get_bits1(gb)) {
127  source->width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */
128  source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
129  }
130 
131  /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
132  * chroma_sampling_format(video_params) */
133  /* [DIRAC_STD] custom_chroma_format_flag */
134  if (get_bits1(gb))
135  /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
136  source->chroma_format = svq3_get_ue_golomb(gb);
137  if (source->chroma_format > 2) {
138  av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
139  source->chroma_format);
140  return AVERROR_INVALIDDATA;
141  }
142 
143  /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
144  /* [DIRAC_STD] custom_scan_format_flag */
145  if (get_bits1(gb))
146  /* [DIRAC_STD] SOURCE_SAMPLING */
147  source->interlaced = svq3_get_ue_golomb(gb);
148  if (source->interlaced > 1)
149  return AVERROR_INVALIDDATA;
150 
151  /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
152  if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
153  source->frame_rate_index = svq3_get_ue_golomb(gb);
154 
155  if (source->frame_rate_index > 10)
156  return AVERROR_INVALIDDATA;
157 
158  if (!source->frame_rate_index) {
159  /* [DIRAC_STD] FRAME_RATE_NUMER */
160  frame_rate.num = svq3_get_ue_golomb(gb);
161  /* [DIRAC_STD] FRAME_RATE_DENOM */
162  frame_rate.den = svq3_get_ue_golomb(gb);
163  }
164  }
165  /* [DIRAC_STD] preset_frame_rate(video_params, index) */
166  if (source->frame_rate_index > 0) {
167  if (source->frame_rate_index <= 8)
168  frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];
169  else
170  /* [DIRAC_STD] Table 10.3 values 9-10 */
171  frame_rate = dirac_frame_rate[source->frame_rate_index-9];
172  }
173  av_reduce(&avctx->time_base.num, &avctx->time_base.den,
174  frame_rate.den, frame_rate.num, 1<<30);
175 
176  /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
177  * pixel_aspect_ratio(video_params) */
178  if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
179  /* [DIRAC_STD] index */
181 
182  if (source->aspect_ratio_index > 6)
183  return AVERROR_INVALIDDATA;
184 
185  if (!source->aspect_ratio_index) {
188  }
189  }
190  /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
191  * aspect ratio values */
192  if (source->aspect_ratio_index > 0)
193  avctx->sample_aspect_ratio =
194  dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
195 
196  /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
197  if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
198  /* [DIRAC_STD] CLEAN_WIDTH */
199  source->clean_width = svq3_get_ue_golomb(gb);
200  /* [DIRAC_STD] CLEAN_HEIGHT */
201  source->clean_height = svq3_get_ue_golomb(gb);
202  /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
204  /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
206  }
207 
208  /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
209  * WARNING: Some adaptation seems to be done using the
210  * AVCOL_RANGE_MPEG/JPEG values */
211  if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
212  /* [DIRAC_STD] index */
214 
215  if (source->pixel_range_index > 4)
216  return AVERROR_INVALIDDATA;
217 
218  // This assumes either fullrange or MPEG levels only
219  if (!source->pixel_range_index) {
220  luma_offset = svq3_get_ue_golomb(gb);
221  luma_depth = av_log2(svq3_get_ue_golomb(gb))+1;
222  svq3_get_ue_golomb(gb); /* chroma offset */
223  svq3_get_ue_golomb(gb); /* chroma excursion */
224  avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
225  }
226  }
227  /* [DIRAC_STD] Table 10.5
228  * Available signal range presets <--> pixel_range_presets */
229  if (source->pixel_range_index > 0) {
230  idx = source->pixel_range_index-1;
231  luma_depth = pixel_range_presets[idx].bitdepth;
232  avctx->color_range = pixel_range_presets[idx].color_range;
233  }
234 
235  if (luma_depth > 8)
236  av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
237 
238  avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
239 
240  /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
241  if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
242  /* [DIRAC_STD] index */
243  idx = source->color_spec_index = svq3_get_ue_golomb(gb);
244 
245  if (source->color_spec_index > 4)
246  return AVERROR_INVALIDDATA;
247 
248  avctx->color_primaries = dirac_color_presets[idx].color_primaries;
249  avctx->colorspace = dirac_color_presets[idx].colorspace;
250  avctx->color_trc = dirac_color_presets[idx].color_trc;
251 
252  if (!source->color_spec_index) {
253  /* [DIRAC_STD] 10.3.9.1 Colour primaries */
254  if (get_bits1(gb)) {
255  idx = svq3_get_ue_golomb(gb);
256  if (idx < 3)
257  avctx->color_primaries = dirac_primaries[idx];
258  }
259  /* [DIRAC_STD] 10.3.9.2 Colour matrix */
260  if (get_bits1(gb)) {
261  idx = svq3_get_ue_golomb(gb);
262  if (!idx)
263  avctx->colorspace = AVCOL_SPC_BT709;
264  else if (idx == 1)
265  avctx->colorspace = AVCOL_SPC_BT470BG;
266  }
267  /* [DIRAC_STD] 10.3.9.3 Transfer function */
268  if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
269  avctx->color_trc = AVCOL_TRC_BT709;
270  }
271  } else {
272  idx = source->color_spec_index;
273  avctx->color_primaries = dirac_color_presets[idx].color_primaries;
274  avctx->colorspace = dirac_color_presets[idx].colorspace;
275  avctx->color_trc = dirac_color_presets[idx].color_trc;
276  }
277 
278  return 0;
279 }
280 
281 /* [DIRAC_STD] 10. Sequence Header. sequence_header() */
283  dirac_source_params *source)
284 {
285  unsigned version_major;
286  unsigned video_format, picture_coding_mode;
287  int ret;
288 
289  /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
290  version_major = svq3_get_ue_golomb(gb);
291  svq3_get_ue_golomb(gb); /* version_minor */
292  avctx->profile = svq3_get_ue_golomb(gb);
293  avctx->level = svq3_get_ue_golomb(gb);
294  /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
295  * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
296  video_format = svq3_get_ue_golomb(gb);
297 
298  if (version_major < 2)
299  av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
300  else if (version_major > 2)
301  av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
302 
303  if (video_format > 20)
304  return AVERROR_INVALIDDATA;
305 
306  // Fill in defaults for the source parameters.
307  *source = dirac_source_parameters_defaults[video_format];
308 
309  /* [DIRAC_STD] 10.3 Source Parameters
310  * Override the defaults. */
311  if (ret = parse_source_parameters(avctx, gb, source))
312  return ret;
313 
314  if (ret = av_image_check_size(source->width, source->height, 0, avctx))
315  return ret;
316 
317  avcodec_set_dimensions(avctx, source->width, source->height);
318 
319  /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
320  * currently only used to signal field coding */
321  picture_coding_mode = svq3_get_ue_golomb(gb);
322  if (picture_coding_mode != 0) {
323  av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
324  picture_coding_mode);
325  return AVERROR_INVALIDDATA;
326  }
327  return 0;
328 }