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path: root/libavcodec/dvbsubdec.c (plain)
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1/*
2 * DVB subtitle decoding
3 * Copyright (c) 2005 Ian Caulfield
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avcodec.h"
23#include "get_bits.h"
24#include "bytestream.h"
25#include "internal.h"
26#include "libavutil/colorspace.h"
27#include "libavutil/opt.h"
28
29#define DVBSUB_PAGE_SEGMENT 0x10
30#define DVBSUB_REGION_SEGMENT 0x11
31#define DVBSUB_CLUT_SEGMENT 0x12
32#define DVBSUB_OBJECT_SEGMENT 0x13
33#define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
34#define DVBSUB_DISPLAY_SEGMENT 0x80
35
36#define cm (ff_crop_tab + MAX_NEG_CROP)
37
38#ifdef DEBUG
39static void png_save(const char *filename, uint32_t *bitmap, int w, int h)
40{
41 int x, y, v;
42 FILE *f;
43 char fname[40], fname2[40];
44 char command[1024];
45
46 snprintf(fname, sizeof(fname), "%s.ppm", filename);
47
48 f = fopen(fname, "w");
49 if (!f) {
50 perror(fname);
51 return;
52 }
53 fprintf(f, "P6\n"
54 "%d %d\n"
55 "%d\n",
56 w, h, 255);
57 for(y = 0; y < h; y++) {
58 for(x = 0; x < w; x++) {
59 v = bitmap[y * w + x];
60 putc((v >> 16) & 0xff, f);
61 putc((v >> 8) & 0xff, f);
62 putc((v >> 0) & 0xff, f);
63 }
64 }
65 fclose(f);
66
67
68 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
69
70 f = fopen(fname2, "w");
71 if (!f) {
72 perror(fname2);
73 return;
74 }
75 fprintf(f, "P5\n"
76 "%d %d\n"
77 "%d\n",
78 w, h, 255);
79 for(y = 0; y < h; y++) {
80 for(x = 0; x < w; x++) {
81 v = bitmap[y * w + x];
82 putc((v >> 24) & 0xff, f);
83 }
84 }
85 fclose(f);
86
87 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
88 system(command);
89
90 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
91 system(command);
92}
93#endif
94
95#define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
96
97typedef struct DVBSubCLUT {
98 int id;
99 int version;
100
101 uint32_t clut4[4];
102 uint32_t clut16[16];
103 uint32_t clut256[256];
104
105 struct DVBSubCLUT *next;
106} DVBSubCLUT;
107
108static DVBSubCLUT default_clut;
109
110typedef struct DVBSubObjectDisplay {
111 int object_id;
112 int region_id;
113
114 int x_pos;
115 int y_pos;
116
117 int fgcolor;
118 int bgcolor;
119
120 struct DVBSubObjectDisplay *region_list_next;
121 struct DVBSubObjectDisplay *object_list_next;
122} DVBSubObjectDisplay;
123
124typedef struct DVBSubObject {
125 int id;
126 int version;
127
128 int type;
129
130 DVBSubObjectDisplay *display_list;
131
132 struct DVBSubObject *next;
133} DVBSubObject;
134
135typedef struct DVBSubRegionDisplay {
136 int region_id;
137
138 int x_pos;
139 int y_pos;
140
141 struct DVBSubRegionDisplay *next;
142} DVBSubRegionDisplay;
143
144typedef struct DVBSubRegion {
145 int id;
146 int version;
147
148 int width;
149 int height;
150 int depth;
151
152 int clut;
153 int bgcolor;
154
155 uint8_t *pbuf;
156 int buf_size;
157 int dirty;
158
159 DVBSubObjectDisplay *display_list;
160
161 struct DVBSubRegion *next;
162} DVBSubRegion;
163
164typedef struct DVBSubDisplayDefinition {
165 int version;
166
167 int x;
168 int y;
169 int width;
170 int height;
171} DVBSubDisplayDefinition;
172
173typedef struct DVBSubContext {
174 AVClass *class;
175 int composition_id;
176 int ancillary_id;
177
178 int version;
179 int time_out;
180 int compute_edt; /**< if 1 end display time calculated using pts
181 if 0 (Default) calculated using time out */
182 int compute_clut;
183 int substream;
184 int64_t prev_start;
185 DVBSubRegion *region_list;
186 DVBSubCLUT *clut_list;
187 DVBSubObject *object_list;
188
189 DVBSubRegionDisplay *display_list;
190 DVBSubDisplayDefinition *display_definition;
191} DVBSubContext;
192
193
194static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
195{
196 DVBSubObject *ptr = ctx->object_list;
197
198 while (ptr && ptr->id != object_id) {
199 ptr = ptr->next;
200 }
201
202 return ptr;
203}
204
205static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
206{
207 DVBSubCLUT *ptr = ctx->clut_list;
208
209 while (ptr && ptr->id != clut_id) {
210 ptr = ptr->next;
211 }
212
213 return ptr;
214}
215
216static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
217{
218 DVBSubRegion *ptr = ctx->region_list;
219
220 while (ptr && ptr->id != region_id) {
221 ptr = ptr->next;
222 }
223
224 return ptr;
225}
226
227static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
228{
229 DVBSubObject *object, *obj2, **obj2_ptr;
230 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
231
232 while (region->display_list) {
233 display = region->display_list;
234
235 object = get_object(ctx, display->object_id);
236
237 if (object) {
238 obj_disp_ptr = &object->display_list;
239 obj_disp = *obj_disp_ptr;
240
241 while (obj_disp && obj_disp != display) {
242 obj_disp_ptr = &obj_disp->object_list_next;
243 obj_disp = *obj_disp_ptr;
244 }
245
246 if (obj_disp) {
247 *obj_disp_ptr = obj_disp->object_list_next;
248
249 if (!object->display_list) {
250 obj2_ptr = &ctx->object_list;
251 obj2 = *obj2_ptr;
252
253 while (obj2 != object) {
254 av_assert0(obj2);
255 obj2_ptr = &obj2->next;
256 obj2 = *obj2_ptr;
257 }
258
259 *obj2_ptr = obj2->next;
260
261 av_freep(&obj2);
262 }
263 }
264 }
265
266 region->display_list = display->region_list_next;
267
268 av_freep(&display);
269 }
270
271}
272
273static void delete_cluts(DVBSubContext *ctx)
274{
275 while (ctx->clut_list) {
276 DVBSubCLUT *clut = ctx->clut_list;
277
278 ctx->clut_list = clut->next;
279
280 av_freep(&clut);
281 }
282}
283
284static void delete_objects(DVBSubContext *ctx)
285{
286 while (ctx->object_list) {
287 DVBSubObject *object = ctx->object_list;
288
289 ctx->object_list = object->next;
290
291 av_freep(&object);
292 }
293}
294
295static void delete_regions(DVBSubContext *ctx)
296{
297 while (ctx->region_list) {
298 DVBSubRegion *region = ctx->region_list;
299
300 ctx->region_list = region->next;
301
302 delete_region_display_list(ctx, region);
303
304 av_freep(&region->pbuf);
305 av_freep(&region);
306 }
307}
308
309static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
310{
311 int i, r, g, b, a = 0;
312 DVBSubContext *ctx = avctx->priv_data;
313
314 if (ctx->substream < 0) {
315 ctx->composition_id = -1;
316 ctx->ancillary_id = -1;
317 } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
318 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
319 ctx->composition_id = -1;
320 ctx->ancillary_id = -1;
321 } else {
322 if (avctx->extradata_size > 5*ctx->substream + 2) {
323 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
324 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
325 } else {
326 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
327 ctx->composition_id = AV_RB16(avctx->extradata);
328 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
329 }
330 }
331
332 ctx->version = -1;
333 ctx->prev_start = AV_NOPTS_VALUE;
334
335 default_clut.id = -1;
336 default_clut.next = NULL;
337
338 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
339 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
340 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
341 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
342
343 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
344 for (i = 1; i < 16; i++) {
345 if (i < 8) {
346 r = (i & 1) ? 255 : 0;
347 g = (i & 2) ? 255 : 0;
348 b = (i & 4) ? 255 : 0;
349 } else {
350 r = (i & 1) ? 127 : 0;
351 g = (i & 2) ? 127 : 0;
352 b = (i & 4) ? 127 : 0;
353 }
354 default_clut.clut16[i] = RGBA(r, g, b, 255);
355 }
356
357 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
358 for (i = 1; i < 256; i++) {
359 if (i < 8) {
360 r = (i & 1) ? 255 : 0;
361 g = (i & 2) ? 255 : 0;
362 b = (i & 4) ? 255 : 0;
363 a = 63;
364 } else {
365 switch (i & 0x88) {
366 case 0x00:
367 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
368 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
369 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
370 a = 255;
371 break;
372 case 0x08:
373 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
374 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
375 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
376 a = 127;
377 break;
378 case 0x80:
379 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
380 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
381 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
382 a = 255;
383 break;
384 case 0x88:
385 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
386 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
387 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
388 a = 255;
389 break;
390 }
391 }
392 default_clut.clut256[i] = RGBA(r, g, b, a);
393 }
394
395 return 0;
396}
397
398static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
399{
400 DVBSubContext *ctx = avctx->priv_data;
401 DVBSubRegionDisplay *display;
402
403 delete_regions(ctx);
404
405 delete_objects(ctx);
406
407 delete_cluts(ctx);
408
409 av_freep(&ctx->display_definition);
410
411 while (ctx->display_list) {
412 display = ctx->display_list;
413 ctx->display_list = display->next;
414
415 av_freep(&display);
416 }
417
418 return 0;
419}
420
421static int dvbsub_read_2bit_string(AVCodecContext *avctx,
422 uint8_t *destbuf, int dbuf_len,
423 const uint8_t **srcbuf, int buf_size,
424 int non_mod, uint8_t *map_table, int x_pos)
425{
426 GetBitContext gb;
427
428 int bits;
429 int run_length;
430 int pixels_read = x_pos;
431
432 init_get_bits(&gb, *srcbuf, buf_size << 3);
433
434 destbuf += x_pos;
435
436 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
437 bits = get_bits(&gb, 2);
438
439 if (bits) {
440 if (non_mod != 1 || bits != 1) {
441 if (map_table)
442 *destbuf++ = map_table[bits];
443 else
444 *destbuf++ = bits;
445 }
446 pixels_read++;
447 } else {
448 bits = get_bits1(&gb);
449 if (bits == 1) {
450 run_length = get_bits(&gb, 3) + 3;
451 bits = get_bits(&gb, 2);
452
453 if (non_mod == 1 && bits == 1)
454 pixels_read += run_length;
455 else {
456 if (map_table)
457 bits = map_table[bits];
458 while (run_length-- > 0 && pixels_read < dbuf_len) {
459 *destbuf++ = bits;
460 pixels_read++;
461 }
462 }
463 } else {
464 bits = get_bits1(&gb);
465 if (bits == 0) {
466 bits = get_bits(&gb, 2);
467 if (bits == 2) {
468 run_length = get_bits(&gb, 4) + 12;
469 bits = get_bits(&gb, 2);
470
471 if (non_mod == 1 && bits == 1)
472 pixels_read += run_length;
473 else {
474 if (map_table)
475 bits = map_table[bits];
476 while (run_length-- > 0 && pixels_read < dbuf_len) {
477 *destbuf++ = bits;
478 pixels_read++;
479 }
480 }
481 } else if (bits == 3) {
482 run_length = get_bits(&gb, 8) + 29;
483 bits = get_bits(&gb, 2);
484
485 if (non_mod == 1 && bits == 1)
486 pixels_read += run_length;
487 else {
488 if (map_table)
489 bits = map_table[bits];
490 while (run_length-- > 0 && pixels_read < dbuf_len) {
491 *destbuf++ = bits;
492 pixels_read++;
493 }
494 }
495 } else if (bits == 1) {
496 if (map_table)
497 bits = map_table[0];
498 else
499 bits = 0;
500 run_length = 2;
501 while (run_length-- > 0 && pixels_read < dbuf_len) {
502 *destbuf++ = bits;
503 pixels_read++;
504 }
505 } else {
506 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
507 return pixels_read;
508 }
509 } else {
510 if (map_table)
511 bits = map_table[0];
512 else
513 bits = 0;
514 *destbuf++ = bits;
515 pixels_read++;
516 }
517 }
518 }
519 }
520
521 if (get_bits(&gb, 6))
522 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
523
524 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
525
526 return pixels_read;
527}
528
529static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
530 const uint8_t **srcbuf, int buf_size,
531 int non_mod, uint8_t *map_table, int x_pos)
532{
533 GetBitContext gb;
534
535 int bits;
536 int run_length;
537 int pixels_read = x_pos;
538
539 init_get_bits(&gb, *srcbuf, buf_size << 3);
540
541 destbuf += x_pos;
542
543 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
544 bits = get_bits(&gb, 4);
545
546 if (bits) {
547 if (non_mod != 1 || bits != 1) {
548 if (map_table)
549 *destbuf++ = map_table[bits];
550 else
551 *destbuf++ = bits;
552 }
553 pixels_read++;
554 } else {
555 bits = get_bits1(&gb);
556 if (bits == 0) {
557 run_length = get_bits(&gb, 3);
558
559 if (run_length == 0) {
560 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
561 return pixels_read;
562 }
563
564 run_length += 2;
565
566 if (map_table)
567 bits = map_table[0];
568 else
569 bits = 0;
570
571 while (run_length-- > 0 && pixels_read < dbuf_len) {
572 *destbuf++ = bits;
573 pixels_read++;
574 }
575 } else {
576 bits = get_bits1(&gb);
577 if (bits == 0) {
578 run_length = get_bits(&gb, 2) + 4;
579 bits = get_bits(&gb, 4);
580
581 if (non_mod == 1 && bits == 1)
582 pixels_read += run_length;
583 else {
584 if (map_table)
585 bits = map_table[bits];
586 while (run_length-- > 0 && pixels_read < dbuf_len) {
587 *destbuf++ = bits;
588 pixels_read++;
589 }
590 }
591 } else {
592 bits = get_bits(&gb, 2);
593 if (bits == 2) {
594 run_length = get_bits(&gb, 4) + 9;
595 bits = get_bits(&gb, 4);
596
597 if (non_mod == 1 && bits == 1)
598 pixels_read += run_length;
599 else {
600 if (map_table)
601 bits = map_table[bits];
602 while (run_length-- > 0 && pixels_read < dbuf_len) {
603 *destbuf++ = bits;
604 pixels_read++;
605 }
606 }
607 } else if (bits == 3) {
608 run_length = get_bits(&gb, 8) + 25;
609 bits = get_bits(&gb, 4);
610
611 if (non_mod == 1 && bits == 1)
612 pixels_read += run_length;
613 else {
614 if (map_table)
615 bits = map_table[bits];
616 while (run_length-- > 0 && pixels_read < dbuf_len) {
617 *destbuf++ = bits;
618 pixels_read++;
619 }
620 }
621 } else if (bits == 1) {
622 if (map_table)
623 bits = map_table[0];
624 else
625 bits = 0;
626 run_length = 2;
627 while (run_length-- > 0 && pixels_read < dbuf_len) {
628 *destbuf++ = bits;
629 pixels_read++;
630 }
631 } else {
632 if (map_table)
633 bits = map_table[0];
634 else
635 bits = 0;
636 *destbuf++ = bits;
637 pixels_read ++;
638 }
639 }
640 }
641 }
642 }
643
644 if (get_bits(&gb, 8))
645 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
646
647 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
648
649 return pixels_read;
650}
651
652static int dvbsub_read_8bit_string(AVCodecContext *avctx,
653 uint8_t *destbuf, int dbuf_len,
654 const uint8_t **srcbuf, int buf_size,
655 int non_mod, uint8_t *map_table, int x_pos)
656{
657 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
658 int bits;
659 int run_length;
660 int pixels_read = x_pos;
661
662 destbuf += x_pos;
663
664 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
665 bits = *(*srcbuf)++;
666
667 if (bits) {
668 if (non_mod != 1 || bits != 1) {
669 if (map_table)
670 *destbuf++ = map_table[bits];
671 else
672 *destbuf++ = bits;
673 }
674 pixels_read++;
675 } else {
676 bits = *(*srcbuf)++;
677 run_length = bits & 0x7f;
678 if ((bits & 0x80) == 0) {
679 if (run_length == 0) {
680 return pixels_read;
681 }
682
683 bits = 0;
684 } else {
685 bits = *(*srcbuf)++;
686 }
687 if (non_mod == 1 && bits == 1)
688 pixels_read += run_length;
689 else {
690 if (map_table)
691 bits = map_table[bits];
692 while (run_length-- > 0 && pixels_read < dbuf_len) {
693 *destbuf++ = bits;
694 pixels_read++;
695 }
696 }
697 }
698 }
699
700 if (*(*srcbuf)++)
701 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
702
703 return pixels_read;
704}
705
706static void compute_default_clut(AVSubtitleRect *rect, int w, int h)
707{
708 uint8_t list[256] = {0};
709 uint8_t list_inv[256];
710 int counttab[256] = {0};
711 int count, i, x, y;
712
713#define V(x,y) rect->data[0][(x) + (y)*rect->linesize[0]]
714 for (y = 0; y<h; y++) {
715 for (x = 0; x<w; x++) {
716 int v = V(x,y) + 1;
717 int vl = x ? V(x-1,y) + 1 : 0;
718 int vr = x+1<w ? V(x+1,y) + 1 : 0;
719 int vt = y ? V(x,y-1) + 1 : 0;
720 int vb = y+1<h ? V(x,y+1) + 1 : 0;
721 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
722 }
723 }
724#define L(x,y) list[ rect->data[0][(x) + (y)*rect->linesize[0]] ]
725
726 for (i = 0; i<256; i++) {
727 int scoretab[256] = {0};
728 int bestscore = 0;
729 int bestv = 0;
730 for (y = 0; y<h; y++) {
731 for (x = 0; x<w; x++) {
732 int v = rect->data[0][x + y*rect->linesize[0]];
733 int l_m = list[v];
734 int l_l = x ? L(x-1, y) : 1;
735 int l_r = x+1<w ? L(x+1, y) : 1;
736 int l_t = y ? L(x, y-1) : 1;
737 int l_b = y+1<h ? L(x, y+1) : 1;
738 int score;
739 if (l_m)
740 continue;
741 scoretab[v] += l_l + l_r + l_t + l_b;
742 score = 1024LL*scoretab[v] / counttab[v];
743 if (score > bestscore) {
744 bestscore = score;
745 bestv = v;
746 }
747 }
748 }
749 if (!bestscore)
750 break;
751 list [ bestv ] = 1;
752 list_inv[ i ] = bestv;
753 }
754
755 count = FFMAX(i - 1, 1);
756 for (i--; i>=0; i--) {
757 int v = i*255/count;
758 AV_WN32(rect->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
759 }
760}
761
762
763static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
764{
765 DVBSubContext *ctx = avctx->priv_data;
766 DVBSubRegionDisplay *display;
767 DVBSubDisplayDefinition *display_def = ctx->display_definition;
768 DVBSubRegion *region;
769 AVSubtitleRect *rect;
770 DVBSubCLUT *clut;
771 uint32_t *clut_table;
772 int i;
773 int offset_x=0, offset_y=0;
774 int ret = 0;
775
776
777 if (display_def) {
778 offset_x = display_def->x;
779 offset_y = display_def->y;
780 }
781
782 /* Not touching AVSubtitles again*/
783 if(sub->num_rects) {
784 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
785 return AVERROR_PATCHWELCOME;
786 }
787 for (display = ctx->display_list; display; display = display->next) {
788 region = get_region(ctx, display->region_id);
789 if (region && region->dirty)
790 sub->num_rects++;
791 }
792
793 if(ctx->compute_edt == 0) {
794 sub->end_display_time = ctx->time_out * 1000;
795 *got_output = 1;
796 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
797 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
798 *got_output = 1;
799 }
800 if (sub->num_rects > 0) {
801
802 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
803 if (!sub->rects) {
804 ret = AVERROR(ENOMEM);
805 goto fail;
806 }
807
808 for(i=0; i<sub->num_rects; i++)
809 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
810
811 i = 0;
812
813 for (display = ctx->display_list; display; display = display->next) {
814 region = get_region(ctx, display->region_id);
815
816 if (!region)
817 continue;
818
819 if (!region->dirty)
820 continue;
821
822 rect = sub->rects[i];
823 rect->x = display->x_pos + offset_x;
824 rect->y = display->y_pos + offset_y;
825 rect->w = region->width;
826 rect->h = region->height;
827 rect->nb_colors = (1 << region->depth);
828 rect->type = SUBTITLE_BITMAP;
829 rect->linesize[0] = region->width;
830
831 clut = get_clut(ctx, region->clut);
832
833 if (!clut)
834 clut = &default_clut;
835
836 switch (region->depth) {
837 case 2:
838 clut_table = clut->clut4;
839 break;
840 case 8:
841 clut_table = clut->clut256;
842 break;
843 case 4:
844 default:
845 clut_table = clut->clut16;
846 break;
847 }
848
849 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
850 if (!rect->data[1]) {
851 ret = AVERROR(ENOMEM);
852 goto fail;
853 }
854 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
855
856 rect->data[0] = av_malloc(region->buf_size);
857 if (!rect->data[0]) {
858 ret = AVERROR(ENOMEM);
859 goto fail;
860 }
861
862 memcpy(rect->data[0], region->pbuf, region->buf_size);
863
864 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1)
865 compute_default_clut(rect, rect->w, rect->h);
866
867#if FF_API_AVPICTURE
868FF_DISABLE_DEPRECATION_WARNINGS
869{
870 int j;
871 for (j = 0; j < 4; j++) {
872 rect->pict.data[j] = rect->data[j];
873 rect->pict.linesize[j] = rect->linesize[j];
874 }
875}
876FF_ENABLE_DEPRECATION_WARNINGS
877#endif
878
879 i++;
880 }
881 }
882
883 return 0;
884fail:
885 if (sub->rects) {
886 for(i=0; i<sub->num_rects; i++) {
887 rect = sub->rects[i];
888 if (rect) {
889 av_freep(&rect->data[0]);
890 av_freep(&rect->data[1]);
891 }
892 av_freep(&sub->rects[i]);
893 }
894 av_freep(&sub->rects);
895 }
896 sub->num_rects = 0;
897 return ret;
898}
899
900static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
901 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
902{
903 DVBSubContext *ctx = avctx->priv_data;
904
905 DVBSubRegion *region = get_region(ctx, display->region_id);
906 const uint8_t *buf_end = buf + buf_size;
907 uint8_t *pbuf;
908 int x_pos, y_pos;
909 int i;
910
911 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
912 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
913 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
914 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
915 uint8_t *map_table;
916
917#if 0
918 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
919 top_bottom ? "bottom" : "top");
920
921 for (i = 0; i < buf_size; i++) {
922 if (i % 16 == 0)
923 ff_dlog(avctx, "0x%8p: ", buf+i);
924
925 ff_dlog(avctx, "%02x ", buf[i]);
926 if (i % 16 == 15)
927 ff_dlog(avctx, "\n");
928 }
929
930 if (i % 16)
931 ff_dlog(avctx, "\n");
932#endif
933
934 if (!region)
935 return;
936
937 pbuf = region->pbuf;
938 region->dirty = 1;
939
940 x_pos = display->x_pos;
941 y_pos = display->y_pos;
942
943 y_pos += top_bottom;
944
945 while (buf < buf_end) {
946 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
947 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
948 return;
949 }
950
951 switch (*buf++) {
952 case 0x10:
953 if (region->depth == 8)
954 map_table = map2to8;
955 else if (region->depth == 4)
956 map_table = map2to4;
957 else
958 map_table = NULL;
959
960 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
961 region->width, &buf, buf_end - buf,
962 non_mod, map_table, x_pos);
963 break;
964 case 0x11:
965 if (region->depth < 4) {
966 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
967 return;
968 }
969
970 if (region->depth == 8)
971 map_table = map4to8;
972 else
973 map_table = NULL;
974
975 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
976 region->width, &buf, buf_end - buf,
977 non_mod, map_table, x_pos);
978 break;
979 case 0x12:
980 if (region->depth < 8) {
981 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
982 return;
983 }
984
985 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
986 region->width, &buf, buf_end - buf,
987 non_mod, NULL, x_pos);
988 break;
989
990 case 0x20:
991 map2to4[0] = (*buf) >> 4;
992 map2to4[1] = (*buf++) & 0xf;
993 map2to4[2] = (*buf) >> 4;
994 map2to4[3] = (*buf++) & 0xf;
995 break;
996 case 0x21:
997 for (i = 0; i < 4; i++)
998 map2to8[i] = *buf++;
999 break;
1000 case 0x22:
1001 for (i = 0; i < 16; i++)
1002 map4to8[i] = *buf++;
1003 break;
1004
1005 case 0xf0:
1006 x_pos = display->x_pos;
1007 y_pos += 2;
1008 break;
1009 default:
1010 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
1011 }
1012 }
1013
1014}
1015
1016static int dvbsub_parse_object_segment(AVCodecContext *avctx,
1017 const uint8_t *buf, int buf_size)
1018{
1019 DVBSubContext *ctx = avctx->priv_data;
1020
1021 const uint8_t *buf_end = buf + buf_size;
1022 int object_id;
1023 DVBSubObject *object;
1024 DVBSubObjectDisplay *display;
1025 int top_field_len, bottom_field_len;
1026
1027 int coding_method, non_modifying_color;
1028
1029 object_id = AV_RB16(buf);
1030 buf += 2;
1031
1032 object = get_object(ctx, object_id);
1033
1034 if (!object)
1035 return AVERROR_INVALIDDATA;
1036
1037 coding_method = ((*buf) >> 2) & 3;
1038 non_modifying_color = ((*buf++) >> 1) & 1;
1039
1040 if (coding_method == 0) {
1041 top_field_len = AV_RB16(buf);
1042 buf += 2;
1043 bottom_field_len = AV_RB16(buf);
1044 buf += 2;
1045
1046 if (buf + top_field_len + bottom_field_len > buf_end) {
1047 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1048 return AVERROR_INVALIDDATA;
1049 }
1050
1051 for (display = object->display_list; display; display = display->object_list_next) {
1052 const uint8_t *block = buf;
1053 int bfl = bottom_field_len;
1054
1055 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1056 non_modifying_color);
1057
1058 if (bottom_field_len > 0)
1059 block = buf + top_field_len;
1060 else
1061 bfl = top_field_len;
1062
1063 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1064 non_modifying_color);
1065 }
1066
1067/* } else if (coding_method == 1) {*/
1068
1069 } else {
1070 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1071 }
1072
1073 return 0;
1074}
1075
1076static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1077 const uint8_t *buf, int buf_size)
1078{
1079 DVBSubContext *ctx = avctx->priv_data;
1080
1081 const uint8_t *buf_end = buf + buf_size;
1082 int i, clut_id;
1083 int version;
1084 DVBSubCLUT *clut;
1085 int entry_id, depth , full_range;
1086 int y, cr, cb, alpha;
1087 int r, g, b, r_add, g_add, b_add;
1088
1089 ff_dlog(avctx, "DVB clut packet:\n");
1090
1091 for (i=0; i < buf_size; i++) {
1092 ff_dlog(avctx, "%02x ", buf[i]);
1093 if (i % 16 == 15)
1094 ff_dlog(avctx, "\n");
1095 }
1096
1097 if (i % 16)
1098 ff_dlog(avctx, "\n");
1099
1100 clut_id = *buf++;
1101 version = ((*buf)>>4)&15;
1102 buf += 1;
1103
1104 clut = get_clut(ctx, clut_id);
1105
1106 if (!clut) {
1107 clut = av_malloc(sizeof(DVBSubCLUT));
1108 if (!clut)
1109 return AVERROR(ENOMEM);
1110
1111 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
1112
1113 clut->id = clut_id;
1114 clut->version = -1;
1115
1116 clut->next = ctx->clut_list;
1117 ctx->clut_list = clut;
1118 }
1119
1120 if (clut->version != version) {
1121
1122 clut->version = version;
1123
1124 while (buf + 4 < buf_end) {
1125 entry_id = *buf++;
1126
1127 depth = (*buf) & 0xe0;
1128
1129 if (depth == 0) {
1130 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1131 }
1132
1133 full_range = (*buf++) & 1;
1134
1135 if (full_range) {
1136 y = *buf++;
1137 cr = *buf++;
1138 cb = *buf++;
1139 alpha = *buf++;
1140 } else {
1141 y = buf[0] & 0xfc;
1142 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1143 cb = (buf[1] << 2) & 0xf0;
1144 alpha = (buf[1] << 6) & 0xc0;
1145
1146 buf += 2;
1147 }
1148
1149 if (y == 0)
1150 alpha = 0xff;
1151
1152 YUV_TO_RGB1_CCIR(cb, cr);
1153 YUV_TO_RGB2_CCIR(r, g, b, y);
1154
1155 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1156 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1157 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1158 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1159 return AVERROR_INVALIDDATA;
1160 }
1161
1162 if (depth & 0x80)
1163 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1164 else if (depth & 0x40)
1165 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1166 else if (depth & 0x20)
1167 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1168 }
1169 }
1170
1171 return 0;
1172}
1173
1174
1175static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1176 const uint8_t *buf, int buf_size)
1177{
1178 DVBSubContext *ctx = avctx->priv_data;
1179
1180 const uint8_t *buf_end = buf + buf_size;
1181 int region_id, object_id;
1182 int av_unused version;
1183 DVBSubRegion *region;
1184 DVBSubObject *object;
1185 DVBSubObjectDisplay *display;
1186 int fill;
1187
1188 if (buf_size < 10)
1189 return AVERROR_INVALIDDATA;
1190
1191 region_id = *buf++;
1192
1193 region = get_region(ctx, region_id);
1194
1195 if (!region) {
1196 region = av_mallocz(sizeof(DVBSubRegion));
1197 if (!region)
1198 return AVERROR(ENOMEM);
1199
1200 region->id = region_id;
1201 region->version = -1;
1202
1203 region->next = ctx->region_list;
1204 ctx->region_list = region;
1205 }
1206
1207 version = ((*buf)>>4) & 15;
1208 fill = ((*buf++) >> 3) & 1;
1209
1210 region->width = AV_RB16(buf);
1211 buf += 2;
1212 region->height = AV_RB16(buf);
1213 buf += 2;
1214
1215 if (region->width * region->height != region->buf_size) {
1216 av_free(region->pbuf);
1217
1218 region->buf_size = region->width * region->height;
1219
1220 region->pbuf = av_malloc(region->buf_size);
1221 if (!region->pbuf) {
1222 region->buf_size =
1223 region->width =
1224 region->height = 0;
1225 return AVERROR(ENOMEM);
1226 }
1227
1228 fill = 1;
1229 region->dirty = 0;
1230 }
1231
1232 region->depth = 1 << (((*buf++) >> 2) & 7);
1233 if(region->depth<2 || region->depth>8){
1234 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1235 region->depth= 4;
1236 }
1237 region->clut = *buf++;
1238
1239 if (region->depth == 8) {
1240 region->bgcolor = *buf++;
1241 buf += 1;
1242 } else {
1243 buf += 1;
1244
1245 if (region->depth == 4)
1246 region->bgcolor = (((*buf++) >> 4) & 15);
1247 else
1248 region->bgcolor = (((*buf++) >> 2) & 3);
1249 }
1250
1251 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1252
1253 if (fill) {
1254 memset(region->pbuf, region->bgcolor, region->buf_size);
1255 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1256 }
1257
1258 delete_region_display_list(ctx, region);
1259
1260 while (buf + 5 < buf_end) {
1261 object_id = AV_RB16(buf);
1262 buf += 2;
1263
1264 object = get_object(ctx, object_id);
1265
1266 if (!object) {
1267 object = av_mallocz(sizeof(DVBSubObject));
1268 if (!object)
1269 return AVERROR(ENOMEM);
1270
1271 object->id = object_id;
1272 object->next = ctx->object_list;
1273 ctx->object_list = object;
1274 }
1275
1276 object->type = (*buf) >> 6;
1277
1278 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1279 if (!display)
1280 return AVERROR(ENOMEM);
1281
1282 display->object_id = object_id;
1283 display->region_id = region_id;
1284
1285 display->x_pos = AV_RB16(buf) & 0xfff;
1286 buf += 2;
1287 display->y_pos = AV_RB16(buf) & 0xfff;
1288 buf += 2;
1289
1290 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1291 display->fgcolor = *buf++;
1292 display->bgcolor = *buf++;
1293 }
1294
1295 display->region_list_next = region->display_list;
1296 region->display_list = display;
1297
1298 display->object_list_next = object->display_list;
1299 object->display_list = display;
1300 }
1301
1302 return 0;
1303}
1304
1305static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1306 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1307{
1308 DVBSubContext *ctx = avctx->priv_data;
1309 DVBSubRegionDisplay *display;
1310 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1311
1312 const uint8_t *buf_end = buf + buf_size;
1313 int region_id;
1314 int page_state;
1315 int timeout;
1316 int version;
1317
1318 if (buf_size < 1)
1319 return AVERROR_INVALIDDATA;
1320
1321 timeout = *buf++;
1322 version = ((*buf)>>4) & 15;
1323 page_state = ((*buf++) >> 2) & 3;
1324
1325 if (ctx->version == version) {
1326 return 0;
1327 }
1328
1329 ctx->time_out = timeout;
1330 ctx->version = version;
1331
1332 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1333
1334 if(ctx->compute_edt == 1)
1335 save_subtitle_set(avctx, sub, got_output);
1336
1337 if (page_state == 1 || page_state == 2) {
1338 delete_regions(ctx);
1339 delete_objects(ctx);
1340 delete_cluts(ctx);
1341 }
1342
1343 tmp_display_list = ctx->display_list;
1344 ctx->display_list = NULL;
1345
1346 while (buf + 5 < buf_end) {
1347 region_id = *buf++;
1348 buf += 1;
1349
1350 display = tmp_display_list;
1351 tmp_ptr = &tmp_display_list;
1352
1353 while (display && display->region_id != region_id) {
1354 tmp_ptr = &display->next;
1355 display = display->next;
1356 }
1357
1358 if (!display) {
1359 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1360 if (!display)
1361 return AVERROR(ENOMEM);
1362 }
1363
1364 display->region_id = region_id;
1365
1366 display->x_pos = AV_RB16(buf);
1367 buf += 2;
1368 display->y_pos = AV_RB16(buf);
1369 buf += 2;
1370
1371 *tmp_ptr = display->next;
1372
1373 display->next = ctx->display_list;
1374 ctx->display_list = display;
1375
1376 ff_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1377 }
1378
1379 while (tmp_display_list) {
1380 display = tmp_display_list;
1381
1382 tmp_display_list = display->next;
1383
1384 av_freep(&display);
1385 }
1386
1387 return 0;
1388}
1389
1390
1391#ifdef DEBUG
1392static int save_display_set(DVBSubContext *ctx)
1393{
1394 DVBSubRegion *region;
1395 DVBSubRegionDisplay *display;
1396 DVBSubCLUT *clut;
1397 uint32_t *clut_table;
1398 int x_pos, y_pos, width, height;
1399 int x, y, y_off, x_off;
1400 uint32_t *pbuf;
1401 char filename[32];
1402 static int fileno_index = 0;
1403
1404 x_pos = -1;
1405 y_pos = -1;
1406 width = 0;
1407 height = 0;
1408
1409 for (display = ctx->display_list; display; display = display->next) {
1410 region = get_region(ctx, display->region_id);
1411
1412 if (!region)
1413 return -1;
1414
1415 if (x_pos == -1) {
1416 x_pos = display->x_pos;
1417 y_pos = display->y_pos;
1418 width = region->width;
1419 height = region->height;
1420 } else {
1421 if (display->x_pos < x_pos) {
1422 width += (x_pos - display->x_pos);
1423 x_pos = display->x_pos;
1424 }
1425
1426 if (display->y_pos < y_pos) {
1427 height += (y_pos - display->y_pos);
1428 y_pos = display->y_pos;
1429 }
1430
1431 if (display->x_pos + region->width > x_pos + width) {
1432 width = display->x_pos + region->width - x_pos;
1433 }
1434
1435 if (display->y_pos + region->height > y_pos + height) {
1436 height = display->y_pos + region->height - y_pos;
1437 }
1438 }
1439 }
1440
1441 if (x_pos >= 0) {
1442
1443 pbuf = av_malloc(width * height * 4);
1444 if (!pbuf)
1445 return -1;
1446
1447 for (display = ctx->display_list; display; display = display->next) {
1448 region = get_region(ctx, display->region_id);
1449
1450 if (!region)
1451 return -1;
1452
1453 x_off = display->x_pos - x_pos;
1454 y_off = display->y_pos - y_pos;
1455
1456 clut = get_clut(ctx, region->clut);
1457
1458 if (!clut)
1459 clut = &default_clut;
1460
1461 switch (region->depth) {
1462 case 2:
1463 clut_table = clut->clut4;
1464 break;
1465 case 8:
1466 clut_table = clut->clut256;
1467 break;
1468 case 4:
1469 default:
1470 clut_table = clut->clut16;
1471 break;
1472 }
1473
1474 for (y = 0; y < region->height; y++) {
1475 for (x = 0; x < region->width; x++) {
1476 pbuf[((y + y_off) * width) + x_off + x] =
1477 clut_table[region->pbuf[y * region->width + x]];
1478 }
1479 }
1480
1481 }
1482
1483 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1484
1485 png_save(filename, pbuf, width, height);
1486
1487 av_freep(&pbuf);
1488 }
1489
1490 fileno_index++;
1491 return 0;
1492}
1493#endif
1494
1495static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1496 const uint8_t *buf,
1497 int buf_size)
1498{
1499 DVBSubContext *ctx = avctx->priv_data;
1500 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1501 int dds_version, info_byte;
1502
1503 if (buf_size < 5)
1504 return AVERROR_INVALIDDATA;
1505
1506 info_byte = bytestream_get_byte(&buf);
1507 dds_version = info_byte >> 4;
1508 if (display_def && display_def->version == dds_version)
1509 return 0; // already have this display definition version
1510
1511 if (!display_def) {
1512 display_def = av_mallocz(sizeof(*display_def));
1513 if (!display_def)
1514 return AVERROR(ENOMEM);
1515 ctx->display_definition = display_def;
1516 }
1517
1518 display_def->version = dds_version;
1519 display_def->x = 0;
1520 display_def->y = 0;
1521 display_def->width = bytestream_get_be16(&buf) + 1;
1522 display_def->height = bytestream_get_be16(&buf) + 1;
1523 if (!avctx->width || !avctx->height) {
1524 avctx->width = display_def->width;
1525 avctx->height = display_def->height;
1526 }
1527
1528 if (info_byte & 1<<3) { // display_window_flag
1529 if (buf_size < 13)
1530 return AVERROR_INVALIDDATA;
1531
1532 display_def->x = bytestream_get_be16(&buf);
1533 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1534 display_def->y = bytestream_get_be16(&buf);
1535 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1536 }
1537
1538 return 0;
1539}
1540
1541static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1542 int buf_size, AVSubtitle *sub,int *got_output)
1543{
1544 DVBSubContext *ctx = avctx->priv_data;
1545
1546 if(ctx->compute_edt == 0)
1547 save_subtitle_set(avctx, sub, got_output);
1548#ifdef DEBUG
1549 save_display_set(ctx);
1550#endif
1551 return 0;
1552}
1553
1554static int dvbsub_decode(AVCodecContext *avctx,
1555 void *data, int *data_size,
1556 AVPacket *avpkt)
1557{
1558 const uint8_t *buf = avpkt->data;
1559 int buf_size = avpkt->size;
1560 DVBSubContext *ctx = avctx->priv_data;
1561 AVSubtitle *sub = data;
1562 const uint8_t *p, *p_end;
1563 int segment_type;
1564 int page_id;
1565 int segment_length;
1566 int i;
1567 int ret = 0;
1568 int got_segment = 0;
1569 int got_dds = 0;
1570
1571 ff_dlog(avctx, "DVB sub packet:\n");
1572
1573 for (i=0; i < buf_size; i++) {
1574 ff_dlog(avctx, "%02x ", buf[i]);
1575 if (i % 16 == 15)
1576 ff_dlog(avctx, "\n");
1577 }
1578
1579 if (i % 16)
1580 ff_dlog(avctx, "\n");
1581
1582 if (buf_size <= 6 || *buf != 0x0f) {
1583 ff_dlog(avctx, "incomplete or broken packet");
1584 return AVERROR_INVALIDDATA;
1585 }
1586
1587 p = buf;
1588 p_end = buf + buf_size;
1589
1590 while (p_end - p >= 6 && *p == 0x0f) {
1591 p += 1;
1592 segment_type = *p++;
1593 page_id = AV_RB16(p);
1594 p += 2;
1595 segment_length = AV_RB16(p);
1596 p += 2;
1597
1598 if (avctx->debug & FF_DEBUG_STARTCODE) {
1599 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1600 }
1601
1602 if (p_end - p < segment_length) {
1603 ff_dlog(avctx, "incomplete or broken packet");
1604 ret = -1;
1605 goto end;
1606 }
1607
1608 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1609 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1610 int ret = 0;
1611 switch (segment_type) {
1612 case DVBSUB_PAGE_SEGMENT:
1613 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, data_size);
1614 got_segment |= 1;
1615 break;
1616 case DVBSUB_REGION_SEGMENT:
1617 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1618 got_segment |= 2;
1619 break;
1620 case DVBSUB_CLUT_SEGMENT:
1621 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1622 if (ret < 0) goto end;
1623 got_segment |= 4;
1624 break;
1625 case DVBSUB_OBJECT_SEGMENT:
1626 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1627 got_segment |= 8;
1628 break;
1629 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1630 ret = dvbsub_parse_display_definition_segment(avctx, p,
1631 segment_length);
1632 got_dds = 1;
1633 break;
1634 case DVBSUB_DISPLAY_SEGMENT:
1635 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, data_size);
1636 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1637 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1638 avctx->width = 720;
1639 avctx->height = 576;
1640 }
1641 got_segment |= 16;
1642 break;
1643 default:
1644 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1645 segment_type, page_id, segment_length);
1646 break;
1647 }
1648 if (ret < 0)
1649 goto end;
1650 }
1651
1652 p += segment_length;
1653 }
1654 // Some streams do not send a display segment but if we have all the other
1655 // segments then we need no further data.
1656 if (got_segment == 15) {
1657 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1658 dvbsub_display_end_segment(avctx, p, 0, sub, data_size);
1659 }
1660
1661end:
1662 if(ret < 0) {
1663 *data_size = 0;
1664 avsubtitle_free(sub);
1665 return ret;
1666 } else {
1667 if(ctx->compute_edt == 1 )
1668 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1669 }
1670
1671 return p - buf;
1672}
1673
1674#define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1675static const AVOption options[] = {
1676 {"compute_edt", "compute end of time using pts or timeout", offsetof(DVBSubContext, compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1677 {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", offsetof(DVBSubContext, compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1678 {"dvb_substream", "", offsetof(DVBSubContext, substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1679 {NULL}
1680};
1681static const AVClass dvbsubdec_class = {
1682 .class_name = "DVB Sub Decoder",
1683 .item_name = av_default_item_name,
1684 .option = options,
1685 .version = LIBAVUTIL_VERSION_INT,
1686};
1687
1688AVCodec ff_dvbsub_decoder = {
1689 .name = "dvbsub",
1690 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1691 .type = AVMEDIA_TYPE_SUBTITLE,
1692 .id = AV_CODEC_ID_DVB_SUBTITLE,
1693 .priv_data_size = sizeof(DVBSubContext),
1694 .init = dvbsub_init_decoder,
1695 .close = dvbsub_close_decoder,
1696 .decode = dvbsub_decode,
1697 .priv_class = &dvbsubdec_class,
1698};
1699
generated by cgit at 2024-05-18 08:39:38 (GMT)