FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dirac.c
Date: 2026-02-12 15:45:49
Exec Total Coverage
Lines: 101 143 70.6%
Functions: 2 2 100.0%
Branches: 45 92 48.9%
Line Branch Exec Source
1 /*
2 * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
3 * Copyright (C) 2009 David Conrad
4 * Copyright (C) 2011 Jordi Ortiz
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Dirac Decoder
26 * @author Marco Gerards <marco@gnu.org>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>
27 */
28
29 #include "config.h"
30
31 #include "libavutil/mem.h"
32 #include "libavutil/pixdesc.h"
33
34 #include "dirac.h"
35 #include "get_bits.h"
36 #include "golomb.h"
37 #include "mpeg12data.h"
38
39 #if CONFIG_DIRAC_PARSE
40
41 typedef struct dirac_source_params {
42 unsigned width;
43 unsigned height;
44 uint8_t chroma_format; ///< 0: 444 1: 422 2: 420
45
46 uint8_t interlaced;
47 uint8_t top_field_first;
48
49 uint8_t frame_rate_index; ///< index into dirac_frame_rate[]
50 uint8_t aspect_ratio_index; ///< index into dirac_aspect_ratio[]
51
52 uint16_t clean_width;
53 uint16_t clean_height;
54 uint16_t clean_left_offset;
55 uint16_t clean_right_offset;
56
57 uint8_t pixel_range_index; ///< index into dirac_pixel_range_presets[]
58 uint8_t color_spec_index; ///< index into dirac_color_spec_presets[]
59 } dirac_source_params;
60
61 /* defaults for source parameters */
62 static const dirac_source_params dirac_source_parameters_defaults[] = {
63 { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
64 { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
65 { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
66 { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
67 { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
68 { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
69 { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
70 { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
71 { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
72
73 { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
74 { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
75 { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
76 { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
77 { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
78 { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
79 { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
80 { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
81
82 { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
83 { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
84 { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
85 { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
86 };
87
88 /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
89 static const AVRational dirac_preset_aspect_ratios[] = {
90 { 1, 1 },
91 { 10, 11 },
92 { 12, 11 },
93 { 40, 33 },
94 { 16, 11 },
95 { 4, 3 },
96 };
97
98 /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
99 * Table 10.3 Available preset frame rate values
100 */
101 static const AVRational dirac_frame_rate[] = {
102 { 15000, 1001 },
103 { 25, 2 },
104 };
105
106 /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
107 * range presets */
108 static const struct {
109 uint8_t bitdepth;
110 enum AVColorRange color_range;
111 } pixel_range_presets[] = {
112 { 8, AVCOL_RANGE_JPEG },
113 { 8, AVCOL_RANGE_MPEG },
114 { 10, AVCOL_RANGE_MPEG },
115 { 12, AVCOL_RANGE_MPEG },
116 };
117
118 static const enum AVColorPrimaries dirac_primaries[] = {
119 AVCOL_PRI_BT709,
120 AVCOL_PRI_SMPTE170M,
121 AVCOL_PRI_BT470BG,
122 };
123
124 static const struct {
125 enum AVColorPrimaries color_primaries;
126 enum AVColorSpace colorspace;
127 enum AVColorTransferCharacteristic color_trc;
128 } dirac_color_presets[] = {
129 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
130 { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
131 { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
132 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
133 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ },
134 };
135
136 /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats */
137 static const enum AVPixelFormat dirac_pix_fmt[][3] = {
138 {AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12},
139 {AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12},
140 {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12},
141 };
142
143 /* [DIRAC_STD] 10.3 Parse Source Parameters.
144 * source_parameters(base_video_format) */
145 70 static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb,
146 void *log_ctx)
147 {
148 70 AVRational frame_rate = { 0, 0 };
149 70 unsigned luma_depth = 8, luma_offset = 16;
150 int idx;
151 int chroma_x_shift, chroma_y_shift;
152 int ret;
153
154 /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
155 /* [DIRAC_STD] custom_dimensions_flag */
156
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 70 if (get_bits1(gb)) {
157 70 dsh->width = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */
158 70 dsh->height = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
159 }
160
161 /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
162 * chroma_sampling_format(video_params) */
163 /* [DIRAC_STD] custom_chroma_format_flag */
164
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 70 if (get_bits1(gb))
165 /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
166 70 dsh->chroma_format = get_interleaved_ue_golomb(gb);
167
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 70 if (dsh->chroma_format > 2U) {
168 ✗ if (log_ctx)
169 ✗ av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
170 ✗ dsh->chroma_format);
171 ✗ return AVERROR_INVALIDDATA;
172 }
173
174 /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
175 /* [DIRAC_STD] custom_scan_format_flag */
176
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 70 if (get_bits1(gb))
177 /* [DIRAC_STD] SOURCE_SAMPLING */
178 70 dsh->interlaced = get_interleaved_ue_golomb(gb);
179
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 70 if (dsh->interlaced > 1U)
180 ✗ return AVERROR_INVALIDDATA;
181
182 /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
183
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 70 if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
184 70 dsh->frame_rate_index = get_interleaved_ue_golomb(gb);
185
186
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 70 if (dsh->frame_rate_index > 10U)
187 ✗ return AVERROR_INVALIDDATA;
188
189
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 70 if (!dsh->frame_rate_index) {
190 /* [DIRAC_STD] FRAME_RATE_NUMER */
191 66 frame_rate.num = get_interleaved_ue_golomb(gb);
192 /* [DIRAC_STD] FRAME_RATE_DENOM */
193 66 frame_rate.den = get_interleaved_ue_golomb(gb);
194 }
195 }
196 /* [DIRAC_STD] preset_frame_rate(video_params, index) */
197
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 70 if (dsh->frame_rate_index > 0) {
198
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 4 if (dsh->frame_rate_index <= 8)
199 4 frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];
200 else
201 /* [DIRAC_STD] Table 10.3 values 9-10 */
202 ✗ frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];
203 }
204 70 dsh->framerate = frame_rate;
205
206 /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
207 * pixel_aspect_ratio(video_params) */
208
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 70 if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
209 /* [DIRAC_STD] index */
210 70 dsh->aspect_ratio_index = get_interleaved_ue_golomb(gb);
211
212
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 70 if (dsh->aspect_ratio_index > 6U)
213 ✗ return AVERROR_INVALIDDATA;
214
215
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 70 if (!dsh->aspect_ratio_index) {
216 66 dsh->sample_aspect_ratio.num = get_interleaved_ue_golomb(gb);
217 66 dsh->sample_aspect_ratio.den = get_interleaved_ue_golomb(gb);
218 }
219 }
220 /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
221 * aspect ratio values */
222
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 70 if (dsh->aspect_ratio_index > 0)
223 4 dsh->sample_aspect_ratio =
224 4 dirac_preset_aspect_ratios[dsh->aspect_ratio_index - 1];
225
226 /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
227
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 70 if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
228 /* [DIRAC_STD] CLEAN_WIDTH */
229 4 dsh->clean_width = get_interleaved_ue_golomb(gb);
230 /* [DIRAC_STD] CLEAN_HEIGHT */
231 4 dsh->clean_height = get_interleaved_ue_golomb(gb);
232 /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
233 4 dsh->clean_left_offset = get_interleaved_ue_golomb(gb);
234 /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
235 4 dsh->clean_right_offset = get_interleaved_ue_golomb(gb);
236 }
237
238 /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
239 * WARNING: Some adaptation seems to be done using the
240 * AVCOL_RANGE_MPEG/JPEG values */
241
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 70 if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
242 /* [DIRAC_STD] index */
243 70 dsh->pixel_range_index = get_interleaved_ue_golomb(gb);
244
245
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 70 if (dsh->pixel_range_index > 4U)
246 ✗ return AVERROR_INVALIDDATA;
247
248 /* This assumes either fullrange or MPEG levels only */
249
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 70 if (!dsh->pixel_range_index) {
250 ✗ luma_offset = get_interleaved_ue_golomb(gb);
251 ✗ luma_depth = av_log2(get_interleaved_ue_golomb(gb)) + 1;
252 ✗ get_interleaved_ue_golomb(gb); /* chroma offset */
253 ✗ get_interleaved_ue_golomb(gb); /* chroma excursion */
254 ✗ dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
255 ✗ : AVCOL_RANGE_JPEG;
256 }
257 }
258 /* [DIRAC_STD] Table 10.5
259 * Available signal range presets <--> pixel_range_presets */
260
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 70 if (dsh->pixel_range_index > 0) {
261 70 idx = dsh->pixel_range_index - 1;
262 70 luma_depth = pixel_range_presets[idx].bitdepth;
263 70 dsh->color_range = pixel_range_presets[idx].color_range;
264 }
265
266 70 dsh->bit_depth = luma_depth;
267
268 /* Full range 8 bts uses the same pix_fmts as limited range 8 bits */
269 70 dsh->pixel_range_index += dsh->pixel_range_index == 1;
270
271
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 70 if (dsh->pixel_range_index < 2U)
272 ✗ return AVERROR_INVALIDDATA;
273
274 70 dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];
275 70 ret = av_pix_fmt_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
276
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 70 if (ret)
277 ✗ return ret;
278
279
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 70 if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) {
280 ✗ if (log_ctx)
281 ✗ av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
282 ✗ return AVERROR_INVALIDDATA;
283 }
284
285 /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
286
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 70 if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
287 /* [DIRAC_STD] index */
288 70 idx = dsh->color_spec_index = get_interleaved_ue_golomb(gb);
289
290
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 70 if (dsh->color_spec_index > 4U)
291 ✗ return AVERROR_INVALIDDATA;
292
293 70 dsh->color_primaries = dirac_color_presets[idx].color_primaries;
294 70 dsh->colorspace = dirac_color_presets[idx].colorspace;
295 70 dsh->color_trc = dirac_color_presets[idx].color_trc;
296
297
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 70 if (!dsh->color_spec_index) {
298 /* [DIRAC_STD] 10.3.9.1 Colour primaries */
299
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 66 if (get_bits1(gb)) {
300 66 idx = get_interleaved_ue_golomb(gb);
301
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 66 if (idx < 3U)
302 66 dsh->color_primaries = dirac_primaries[idx];
303 }
304 /* [DIRAC_STD] 10.3.9.2 Colour matrix */
305
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 66 if (get_bits1(gb)) {
306 66 idx = get_interleaved_ue_golomb(gb);
307
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 66 if (!idx)
308 66 dsh->colorspace = AVCOL_SPC_BT709;
309 ✗ else if (idx == 1)
310 ✗ dsh->colorspace = AVCOL_SPC_BT470BG;
311 }
312 /* [DIRAC_STD] 10.3.9.3 Transfer function */
313
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 66 if (get_bits1(gb) && !get_interleaved_ue_golomb(gb))
314 66 dsh->color_trc = AVCOL_TRC_BT709;
315 }
316 } else {
317 ✗ idx = dsh->color_spec_index;
318 ✗ dsh->color_primaries = dirac_color_presets[idx].color_primaries;
319 ✗ dsh->colorspace = dirac_color_presets[idx].colorspace;
320 ✗ dsh->color_trc = dirac_color_presets[idx].color_trc;
321 }
322
323 70 return 0;
324 }
325
326 /* [DIRAC_STD] 10. Sequence Header. sequence_header() */
327 70 int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
328 const uint8_t *buf, size_t buf_size,
329 void *log_ctx)
330 {
331 AVDiracSeqHeader *dsh;
332 GetBitContext gb;
333 unsigned video_format, picture_coding_mode;
334 int ret;
335
336 70 dsh = av_mallocz(sizeof(*dsh));
337
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 70 if (!dsh)
338 ✗ return AVERROR(ENOMEM);
339
340 70 ret = init_get_bits8(&gb, buf, buf_size);
341
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 70 if (ret < 0)
342 ✗ goto fail;
343
344 /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
345 70 dsh->version.major = get_interleaved_ue_golomb(&gb);
346 70 dsh->version.minor = get_interleaved_ue_golomb(&gb);
347 70 dsh->profile = get_interleaved_ue_golomb(&gb);
348 70 dsh->level = get_interleaved_ue_golomb(&gb);
349 /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
350 * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
351 70 video_format = get_interleaved_ue_golomb(&gb);
352
353
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 70 if (dsh->version.major < 2 && log_ctx)
354 ✗ av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
355
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 70 else if (dsh->version.major > 2 && log_ctx)
356 ✗ av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
357
358
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 70 if (video_format > 20U) {
359 ✗ ret = AVERROR_INVALIDDATA;
360 ✗ goto fail;
361 }
362
363 /* Fill in defaults for the source parameters. */
364 70 dsh->width = dirac_source_parameters_defaults[video_format].width;
365 70 dsh->height = dirac_source_parameters_defaults[video_format].height;
366 70 dsh->chroma_format = dirac_source_parameters_defaults[video_format].chroma_format;
367 70 dsh->interlaced = dirac_source_parameters_defaults[video_format].interlaced;
368 70 dsh->top_field_first = dirac_source_parameters_defaults[video_format].top_field_first;
369 70 dsh->frame_rate_index = dirac_source_parameters_defaults[video_format].frame_rate_index;
370 70 dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
371 70 dsh->clean_width = dirac_source_parameters_defaults[video_format].clean_width;
372 70 dsh->clean_height = dirac_source_parameters_defaults[video_format].clean_height;
373 70 dsh->clean_left_offset = dirac_source_parameters_defaults[video_format].clean_left_offset;
374 70 dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
375 70 dsh->pixel_range_index = dirac_source_parameters_defaults[video_format].pixel_range_index;
376 70 dsh->color_spec_index = dirac_source_parameters_defaults[video_format].color_spec_index;
377
378 /* [DIRAC_STD] 10.3 Source Parameters
379 * Override the defaults. */
380 70 ret = parse_source_parameters(dsh, &gb, log_ctx);
381
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 70 if (ret < 0)
382 ✗ goto fail;
383
384 /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
385 * currently only used to signal field coding */
386 70 picture_coding_mode = get_interleaved_ue_golomb(&gb);
387
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 70 if (picture_coding_mode != 0) {
388 ✗ if (log_ctx) {
389 ✗ av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
390 picture_coding_mode);
391 }
392 ✗ ret = AVERROR_INVALIDDATA;
393 ✗ goto fail;
394 }
395
396 70 *pdsh = dsh;
397 70 return 0;
398 ✗ fail:
399 ✗ av_freep(&dsh);
400 ✗ *pdsh = NULL;
401 ✗ return ret;
402 }
403 #else
404 int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
405 const uint8_t *buf, size_t buf_size,
406 void *log_ctx)
407 {
408 return AVERROR(ENOSYS);
409 }
410 #endif
411