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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 "libavutil/imgutils.h"
30
31#include "avcodec.h"
32#include "dirac.h"
33#include "golomb.h"
34#include "internal.h"
35#include "mpeg12data.h"
36
37#if CONFIG_DIRAC_PARSE
38
39typedef struct dirac_source_params {
40 unsigned width;
41 unsigned height;
42 uint8_t chroma_format; ///< 0: 444 1: 422 2: 420
43
44 uint8_t interlaced;
45 uint8_t top_field_first;
46
47 uint8_t frame_rate_index; ///< index into dirac_frame_rate[]
48 uint8_t aspect_ratio_index; ///< index into dirac_aspect_ratio[]
49
50 uint16_t clean_width;
51 uint16_t clean_height;
52 uint16_t clean_left_offset;
53 uint16_t clean_right_offset;
54
55 uint8_t pixel_range_index; ///< index into dirac_pixel_range_presets[]
56 uint8_t color_spec_index; ///< index into dirac_color_spec_presets[]
57} dirac_source_params;
58
59/* defaults for source parameters */
60static const dirac_source_params dirac_source_parameters_defaults[] = {
61 { 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
62 { 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
63 { 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
64 { 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
65 { 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
66 { 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
67 { 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
68 { 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
69 { 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
70
71 { 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
72 { 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
73 { 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
74 { 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
75 { 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
76 { 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
77 { 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
78 { 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
79
80 { 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
81 { 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
82 { 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
83 { 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
84};
85
86/* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
87static const AVRational dirac_preset_aspect_ratios[] = {
88 { 1, 1 },
89 { 10, 11 },
90 { 12, 11 },
91 { 40, 33 },
92 { 16, 11 },
93 { 4, 3 },
94};
95
96/* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
97 * Table 10.3 Available preset frame rate values
98 */
99static const AVRational dirac_frame_rate[] = {
100 { 15000, 1001 },
101 { 25, 2 },
102};
103
104/* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
105 * range presets */
106static const struct {
107 uint8_t bitdepth;
108 enum AVColorRange color_range;
109} pixel_range_presets[] = {
110 { 8, AVCOL_RANGE_JPEG },
111 { 8, AVCOL_RANGE_MPEG },
112 { 10, AVCOL_RANGE_MPEG },
113 { 12, AVCOL_RANGE_MPEG },
114};
115
116static const enum AVColorPrimaries dirac_primaries[] = {
117 AVCOL_PRI_BT709,
118 AVCOL_PRI_SMPTE170M,
119 AVCOL_PRI_BT470BG,
120};
121
122static const struct {
123 enum AVColorPrimaries color_primaries;
124 enum AVColorSpace colorspace;
125 enum AVColorTransferCharacteristic color_trc;
126} dirac_color_presets[] = {
127 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
128 { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
129 { AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
130 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
131 { AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ },
132};
133
134/* [DIRAC_STD] Table 10.2 Supported chroma sampling formats */
135static const enum AVPixelFormat dirac_pix_fmt[][3] = {
136 {AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12},
137 {AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12},
138 {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12},
139};
140
141/* [DIRAC_STD] 10.3 Parse Source Parameters.
142 * source_parameters(base_video_format) */
143static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb,
144 void *log_ctx)
145{
146 AVRational frame_rate = { 0, 0 };
147 unsigned luma_depth = 8, luma_offset = 16;
148 int idx;
149 int chroma_x_shift, chroma_y_shift;
150
151 /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
152 /* [DIRAC_STD] custom_dimensions_flag */
153 if (get_bits1(gb)) {
154 dsh->width = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */
155 dsh->height = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
156 }
157
158 /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
159 * chroma_sampling_format(video_params) */
160 /* [DIRAC_STD] custom_chroma_format_flag */
161 if (get_bits1(gb))
162 /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
163 dsh->chroma_format = get_interleaved_ue_golomb(gb);
164 if (dsh->chroma_format > 2U) {
165 if (log_ctx)
166 av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
167 dsh->chroma_format);
168 return AVERROR_INVALIDDATA;
169 }
170
171 /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
172 /* [DIRAC_STD] custom_scan_format_flag */
173 if (get_bits1(gb))
174 /* [DIRAC_STD] SOURCE_SAMPLING */
175 dsh->interlaced = get_interleaved_ue_golomb(gb);
176 if (dsh->interlaced > 1U)
177 return AVERROR_INVALIDDATA;
178
179 /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
180 if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
181 dsh->frame_rate_index = get_interleaved_ue_golomb(gb);
182
183 if (dsh->frame_rate_index > 10U)
184 return AVERROR_INVALIDDATA;
185
186 if (!dsh->frame_rate_index) {
187 /* [DIRAC_STD] FRAME_RATE_NUMER */
188 frame_rate.num = get_interleaved_ue_golomb(gb);
189 /* [DIRAC_STD] FRAME_RATE_DENOM */
190 frame_rate.den = get_interleaved_ue_golomb(gb);
191 }
192 }
193 /* [DIRAC_STD] preset_frame_rate(video_params, index) */
194 if (dsh->frame_rate_index > 0) {
195 if (dsh->frame_rate_index <= 8)
196 frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];
197 else
198 /* [DIRAC_STD] Table 10.3 values 9-10 */
199 frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];
200 }
201 dsh->framerate = frame_rate;
202
203 /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
204 * pixel_aspect_ratio(video_params) */
205 if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
206 /* [DIRAC_STD] index */
207 dsh->aspect_ratio_index = get_interleaved_ue_golomb(gb);
208
209 if (dsh->aspect_ratio_index > 6U)
210 return AVERROR_INVALIDDATA;
211
212 if (!dsh->aspect_ratio_index) {
213 dsh->sample_aspect_ratio.num = get_interleaved_ue_golomb(gb);
214 dsh->sample_aspect_ratio.den = get_interleaved_ue_golomb(gb);
215 }
216 }
217 /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
218 * aspect ratio values */
219 if (dsh->aspect_ratio_index > 0)
220 dsh->sample_aspect_ratio =
221 dirac_preset_aspect_ratios[dsh->aspect_ratio_index - 1];
222
223 /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
224 if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
225 /* [DIRAC_STD] CLEAN_WIDTH */
226 dsh->clean_width = get_interleaved_ue_golomb(gb);
227 /* [DIRAC_STD] CLEAN_HEIGHT */
228 dsh->clean_height = get_interleaved_ue_golomb(gb);
229 /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
230 dsh->clean_left_offset = get_interleaved_ue_golomb(gb);
231 /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
232 dsh->clean_right_offset = get_interleaved_ue_golomb(gb);
233 }
234
235 /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
236 * WARNING: Some adaptation seems to be done using the
237 * AVCOL_RANGE_MPEG/JPEG values */
238 if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
239 /* [DIRAC_STD] index */
240 dsh->pixel_range_index = get_interleaved_ue_golomb(gb);
241
242 if (dsh->pixel_range_index > 4U)
243 return AVERROR_INVALIDDATA;
244
245 /* This assumes either fullrange or MPEG levels only */
246 if (!dsh->pixel_range_index) {
247 luma_offset = get_interleaved_ue_golomb(gb);
248 luma_depth = av_log2(get_interleaved_ue_golomb(gb)) + 1;
249 get_interleaved_ue_golomb(gb); /* chroma offset */
250 get_interleaved_ue_golomb(gb); /* chroma excursion */
251 dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
252 : AVCOL_RANGE_JPEG;
253 }
254 }
255 /* [DIRAC_STD] Table 10.5
256 * Available signal range presets <--> pixel_range_presets */
257 if (dsh->pixel_range_index > 0) {
258 idx = dsh->pixel_range_index - 1;
259 luma_depth = pixel_range_presets[idx].bitdepth;
260 dsh->color_range = pixel_range_presets[idx].color_range;
261 }
262
263 dsh->bit_depth = luma_depth;
264
265 /* Full range 8 bts uses the same pix_fmts as limited range 8 bits */
266 dsh->pixel_range_index += dsh->pixel_range_index == 1;
267
268 if (dsh->pixel_range_index < 2U)
269 return AVERROR_INVALIDDATA;
270
271 dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];
272 avcodec_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
273 if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) {
274 if (log_ctx)
275 av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
276 return AVERROR_INVALIDDATA;
277 }
278
279 /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
280 if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
281 /* [DIRAC_STD] index */
282 idx = dsh->color_spec_index = get_interleaved_ue_golomb(gb);
283
284 if (dsh->color_spec_index > 4U)
285 return AVERROR_INVALIDDATA;
286
287 dsh->color_primaries = dirac_color_presets[idx].color_primaries;
288 dsh->colorspace = dirac_color_presets[idx].colorspace;
289 dsh->color_trc = dirac_color_presets[idx].color_trc;
290
291 if (!dsh->color_spec_index) {
292 /* [DIRAC_STD] 10.3.9.1 Colour primaries */
293 if (get_bits1(gb)) {
294 idx = get_interleaved_ue_golomb(gb);
295 if (idx < 3U)
296 dsh->color_primaries = dirac_primaries[idx];
297 }
298 /* [DIRAC_STD] 10.3.9.2 Colour matrix */
299 if (get_bits1(gb)) {
300 idx = get_interleaved_ue_golomb(gb);
301 if (!idx)
302 dsh->colorspace = AVCOL_SPC_BT709;
303 else if (idx == 1)
304 dsh->colorspace = AVCOL_SPC_BT470BG;
305 }
306 /* [DIRAC_STD] 10.3.9.3 Transfer function */
307 if (get_bits1(gb) && !get_interleaved_ue_golomb(gb))
308 dsh->color_trc = AVCOL_TRC_BT709;
309 }
310 } else {
311 idx = dsh->color_spec_index;
312 dsh->color_primaries = dirac_color_presets[idx].color_primaries;
313 dsh->colorspace = dirac_color_presets[idx].colorspace;
314 dsh->color_trc = dirac_color_presets[idx].color_trc;
315 }
316
317 return 0;
318}
319
320/* [DIRAC_STD] 10. Sequence Header. sequence_header() */
321int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
322 const uint8_t *buf, size_t buf_size,
323 void *log_ctx)
324{
325 AVDiracSeqHeader *dsh;
326 GetBitContext gb;
327 unsigned video_format, picture_coding_mode;
328 int ret;
329
330 dsh = av_mallocz(sizeof(*dsh));
331 if (!dsh)
332 return AVERROR(ENOMEM);
333
334 ret = init_get_bits8(&gb, buf, buf_size);
335 if (ret < 0)
336 goto fail;
337
338 /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
339 dsh->version.major = get_interleaved_ue_golomb(&gb);
340 dsh->version.minor = get_interleaved_ue_golomb(&gb);
341 dsh->profile = get_interleaved_ue_golomb(&gb);
342 dsh->level = get_interleaved_ue_golomb(&gb);
343 /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
344 * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
345 video_format = get_interleaved_ue_golomb(&gb);
346
347 if (dsh->version.major < 2 && log_ctx)
348 av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
349 else if (dsh->version.major > 2 && log_ctx)
350 av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
351
352 if (video_format > 20U) {
353 ret = AVERROR_INVALIDDATA;
354 goto fail;
355 }
356
357 /* Fill in defaults for the source parameters. */
358 dsh->width = dirac_source_parameters_defaults[video_format].width;
359 dsh->height = dirac_source_parameters_defaults[video_format].height;
360 dsh->chroma_format = dirac_source_parameters_defaults[video_format].chroma_format;
361 dsh->interlaced = dirac_source_parameters_defaults[video_format].interlaced;
362 dsh->top_field_first = dirac_source_parameters_defaults[video_format].top_field_first;
363 dsh->frame_rate_index = dirac_source_parameters_defaults[video_format].frame_rate_index;
364 dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
365 dsh->clean_width = dirac_source_parameters_defaults[video_format].clean_width;
366 dsh->clean_height = dirac_source_parameters_defaults[video_format].clean_height;
367 dsh->clean_left_offset = dirac_source_parameters_defaults[video_format].clean_left_offset;
368 dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
369 dsh->pixel_range_index = dirac_source_parameters_defaults[video_format].pixel_range_index;
370 dsh->color_spec_index = dirac_source_parameters_defaults[video_format].color_spec_index;
371
372 /* [DIRAC_STD] 10.3 Source Parameters
373 * Override the defaults. */
374 ret = parse_source_parameters(dsh, &gb, log_ctx);
375 if (ret < 0)
376 goto fail;
377
378 /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
379 * currently only used to signal field coding */
380 picture_coding_mode = get_interleaved_ue_golomb(&gb);
381 if (picture_coding_mode != 0) {
382 if (log_ctx) {
383 av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
384 picture_coding_mode);
385 }
386 ret = AVERROR_INVALIDDATA;
387 goto fail;
388 }
389
390 *pdsh = dsh;
391 return 0;
392fail:
393 av_freep(&dsh);
394 *pdsh = NULL;
395 return ret;
396}
397#else
398int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
399 const uint8_t *buf, size_t buf_size,
400 void *log_ctx)
401{
402 return AVERROR(ENOSYS);
403}
404#endif
405
generated by cgit at 2024-05-17 20:22:16 (GMT)