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/imgutils.h"
28 #include "libavutil/opt.h"
29
30 #define DVBSUB_PAGE_SEGMENT 0x10
31 #define DVBSUB_REGION_SEGMENT 0x11
32 #define DVBSUB_CLUT_SEGMENT 0x12
33 #define DVBSUB_OBJECT_SEGMENT 0x13
34 #define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14
35 #define DVBSUB_DISPLAY_SEGMENT 0x80
36
37 #define cm (ff_crop_tab + MAX_NEG_CROP)
38
39 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
40
41 typedef struct DVBSubCLUT {
42 int id;
43 int version;
44
45 uint32_t clut4[4];
46 uint32_t clut16[16];
47 uint32_t clut256[256];
48
49 struct DVBSubCLUT *next;
50 } DVBSubCLUT;
51
52 static DVBSubCLUT default_clut;
53
54 typedef struct DVBSubObjectDisplay {
55 int object_id;
56 int region_id;
57
58 int x_pos;
59 int y_pos;
60
61 int fgcolor;
62 int bgcolor;
63
64 struct DVBSubObjectDisplay *region_list_next;
65 struct DVBSubObjectDisplay *object_list_next;
66 } DVBSubObjectDisplay;
67
68 typedef struct DVBSubObject {
69 int id;
70 int version;
71
72 int type;
73
74 DVBSubObjectDisplay *display_list;
75
76 struct DVBSubObject *next;
77 } DVBSubObject;
78
79 typedef struct DVBSubRegionDisplay {
80 int region_id;
81
82 int x_pos;
83 int y_pos;
84
85 struct DVBSubRegionDisplay *next;
86 } DVBSubRegionDisplay;
87
88 typedef struct DVBSubRegion {
89 int id;
90 int version;
91
92 int width;
93 int height;
94 int depth;
95
96 int clut;
97 int bgcolor;
98
99 uint8_t computed_clut[4*256];
100 int has_computed_clut;
101
102 uint8_t *pbuf;
103 int buf_size;
104 int dirty;
105
106 DVBSubObjectDisplay *display_list;
107
108 struct DVBSubRegion *next;
109 } DVBSubRegion;
110
111 typedef struct DVBSubDisplayDefinition {
112 int version;
113
114 int x;
115 int y;
116 int width;
117 int height;
118 } DVBSubDisplayDefinition;
119
120 typedef struct DVBSubContext {
121 AVClass *class;
122 int composition_id;
123 int ancillary_id;
124
125 int version;
126 int time_out;
127 int compute_edt; /**< if 1 end display time calculated using pts
128 if 0 (Default) calculated using time out */
129 int compute_clut;
130 int clut_count2[257][256];
131 int substream;
132 int64_t prev_start;
133 DVBSubRegion *region_list;
134 DVBSubCLUT *clut_list;
135 DVBSubObject *object_list;
136
137 DVBSubRegionDisplay *display_list;
138 DVBSubDisplayDefinition *display_definition;
139 } DVBSubContext;
140
141
get_object(DVBSubContext * ctx,int object_id)142 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
143 {
144 DVBSubObject *ptr = ctx->object_list;
145
146 while (ptr && ptr->id != object_id) {
147 ptr = ptr->next;
148 }
149
150 return ptr;
151 }
152
get_clut(DVBSubContext * ctx,int clut_id)153 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
154 {
155 DVBSubCLUT *ptr = ctx->clut_list;
156
157 while (ptr && ptr->id != clut_id) {
158 ptr = ptr->next;
159 }
160
161 return ptr;
162 }
163
get_region(DVBSubContext * ctx,int region_id)164 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
165 {
166 DVBSubRegion *ptr = ctx->region_list;
167
168 while (ptr && ptr->id != region_id) {
169 ptr = ptr->next;
170 }
171
172 return ptr;
173 }
174
delete_region_display_list(DVBSubContext * ctx,DVBSubRegion * region)175 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
176 {
177 DVBSubObject *object, *obj2, **obj2_ptr;
178 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
179
180 while (region->display_list) {
181 display = region->display_list;
182
183 object = get_object(ctx, display->object_id);
184
185 if (object) {
186 obj_disp_ptr = &object->display_list;
187 obj_disp = *obj_disp_ptr;
188
189 while (obj_disp && obj_disp != display) {
190 obj_disp_ptr = &obj_disp->object_list_next;
191 obj_disp = *obj_disp_ptr;
192 }
193
194 if (obj_disp) {
195 *obj_disp_ptr = obj_disp->object_list_next;
196
197 if (!object->display_list) {
198 obj2_ptr = &ctx->object_list;
199 obj2 = *obj2_ptr;
200
201 while (obj2 != object) {
202 av_assert0(obj2);
203 obj2_ptr = &obj2->next;
204 obj2 = *obj2_ptr;
205 }
206
207 *obj2_ptr = obj2->next;
208
209 av_freep(&obj2);
210 }
211 }
212 }
213
214 region->display_list = display->region_list_next;
215
216 av_freep(&display);
217 }
218
219 }
220
delete_cluts(DVBSubContext * ctx)221 static void delete_cluts(DVBSubContext *ctx)
222 {
223 while (ctx->clut_list) {
224 DVBSubCLUT *clut = ctx->clut_list;
225
226 ctx->clut_list = clut->next;
227
228 av_freep(&clut);
229 }
230 }
231
delete_objects(DVBSubContext * ctx)232 static void delete_objects(DVBSubContext *ctx)
233 {
234 while (ctx->object_list) {
235 DVBSubObject *object = ctx->object_list;
236
237 ctx->object_list = object->next;
238
239 av_freep(&object);
240 }
241 }
242
delete_regions(DVBSubContext * ctx)243 static void delete_regions(DVBSubContext *ctx)
244 {
245 while (ctx->region_list) {
246 DVBSubRegion *region = ctx->region_list;
247
248 ctx->region_list = region->next;
249
250 delete_region_display_list(ctx, region);
251
252 av_freep(®ion->pbuf);
253 av_freep(®ion);
254 }
255 }
256
dvbsub_init_decoder(AVCodecContext * avctx)257 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
258 {
259 int i, r, g, b, a = 0;
260 DVBSubContext *ctx = avctx->priv_data;
261
262 if (ctx->substream < 0) {
263 ctx->composition_id = -1;
264 ctx->ancillary_id = -1;
265 } else if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
266 av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
267 ctx->composition_id = -1;
268 ctx->ancillary_id = -1;
269 } else {
270 if (avctx->extradata_size > 5*ctx->substream + 2) {
271 ctx->composition_id = AV_RB16(avctx->extradata + 5*ctx->substream);
272 ctx->ancillary_id = AV_RB16(avctx->extradata + 5*ctx->substream + 2);
273 } else {
274 av_log(avctx, AV_LOG_WARNING, "Selected DVB subtitles sub-stream %d is not available\n", ctx->substream);
275 ctx->composition_id = AV_RB16(avctx->extradata);
276 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
277 }
278 }
279
280 ctx->version = -1;
281 ctx->prev_start = AV_NOPTS_VALUE;
282
283 default_clut.id = -1;
284 default_clut.next = NULL;
285
286 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
287 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
288 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
289 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
290
291 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
292 for (i = 1; i < 16; i++) {
293 if (i < 8) {
294 r = (i & 1) ? 255 : 0;
295 g = (i & 2) ? 255 : 0;
296 b = (i & 4) ? 255 : 0;
297 } else {
298 r = (i & 1) ? 127 : 0;
299 g = (i & 2) ? 127 : 0;
300 b = (i & 4) ? 127 : 0;
301 }
302 default_clut.clut16[i] = RGBA(r, g, b, 255);
303 }
304
305 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
306 for (i = 1; i < 256; i++) {
307 if (i < 8) {
308 r = (i & 1) ? 255 : 0;
309 g = (i & 2) ? 255 : 0;
310 b = (i & 4) ? 255 : 0;
311 a = 63;
312 } else {
313 switch (i & 0x88) {
314 case 0x00:
315 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
316 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
317 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
318 a = 255;
319 break;
320 case 0x08:
321 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
322 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
323 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
324 a = 127;
325 break;
326 case 0x80:
327 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
328 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
329 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
330 a = 255;
331 break;
332 case 0x88:
333 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
334 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
335 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
336 a = 255;
337 break;
338 }
339 }
340 default_clut.clut256[i] = RGBA(r, g, b, a);
341 }
342
343 return 0;
344 }
345
dvbsub_close_decoder(AVCodecContext * avctx)346 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
347 {
348 DVBSubContext *ctx = avctx->priv_data;
349 DVBSubRegionDisplay *display;
350
351 delete_regions(ctx);
352
353 delete_objects(ctx);
354
355 delete_cluts(ctx);
356
357 av_freep(&ctx->display_definition);
358
359 while (ctx->display_list) {
360 display = ctx->display_list;
361 ctx->display_list = display->next;
362
363 av_freep(&display);
364 }
365
366 return 0;
367 }
368
dvbsub_read_2bit_string(AVCodecContext * avctx,uint8_t * destbuf,int dbuf_len,const uint8_t ** srcbuf,int buf_size,int non_mod,uint8_t * map_table,int x_pos)369 static int dvbsub_read_2bit_string(AVCodecContext *avctx,
370 uint8_t *destbuf, int dbuf_len,
371 const uint8_t **srcbuf, int buf_size,
372 int non_mod, uint8_t *map_table, int x_pos)
373 {
374 GetBitContext gb;
375
376 int bits;
377 int run_length;
378 int pixels_read = x_pos;
379
380 init_get_bits(&gb, *srcbuf, buf_size << 3);
381
382 destbuf += x_pos;
383
384 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
385 bits = get_bits(&gb, 2);
386
387 if (bits) {
388 if (non_mod != 1 || bits != 1) {
389 if (map_table)
390 *destbuf++ = map_table[bits];
391 else
392 *destbuf++ = bits;
393 }
394 pixels_read++;
395 } else {
396 bits = get_bits1(&gb);
397 if (bits == 1) {
398 run_length = get_bits(&gb, 3) + 3;
399 bits = get_bits(&gb, 2);
400
401 if (non_mod == 1 && bits == 1)
402 pixels_read += run_length;
403 else {
404 if (map_table)
405 bits = map_table[bits];
406 while (run_length-- > 0 && pixels_read < dbuf_len) {
407 *destbuf++ = bits;
408 pixels_read++;
409 }
410 }
411 } else {
412 bits = get_bits1(&gb);
413 if (bits == 0) {
414 bits = get_bits(&gb, 2);
415 if (bits == 2) {
416 run_length = get_bits(&gb, 4) + 12;
417 bits = get_bits(&gb, 2);
418
419 if (non_mod == 1 && bits == 1)
420 pixels_read += run_length;
421 else {
422 if (map_table)
423 bits = map_table[bits];
424 while (run_length-- > 0 && pixels_read < dbuf_len) {
425 *destbuf++ = bits;
426 pixels_read++;
427 }
428 }
429 } else if (bits == 3) {
430 run_length = get_bits(&gb, 8) + 29;
431 bits = get_bits(&gb, 2);
432
433 if (non_mod == 1 && bits == 1)
434 pixels_read += run_length;
435 else {
436 if (map_table)
437 bits = map_table[bits];
438 while (run_length-- > 0 && pixels_read < dbuf_len) {
439 *destbuf++ = bits;
440 pixels_read++;
441 }
442 }
443 } else if (bits == 1) {
444 if (map_table)
445 bits = map_table[0];
446 else
447 bits = 0;
448 run_length = 2;
449 while (run_length-- > 0 && pixels_read < dbuf_len) {
450 *destbuf++ = bits;
451 pixels_read++;
452 }
453 } else {
454 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
455 return pixels_read;
456 }
457 } else {
458 if (map_table)
459 bits = map_table[0];
460 else
461 bits = 0;
462 *destbuf++ = bits;
463 pixels_read++;
464 }
465 }
466 }
467 }
468
469 if (get_bits(&gb, 6))
470 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
471
472 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
473
474 return pixels_read;
475 }
476
dvbsub_read_4bit_string(AVCodecContext * avctx,uint8_t * destbuf,int dbuf_len,const uint8_t ** srcbuf,int buf_size,int non_mod,uint8_t * map_table,int x_pos)477 static int dvbsub_read_4bit_string(AVCodecContext *avctx, uint8_t *destbuf, int dbuf_len,
478 const uint8_t **srcbuf, int buf_size,
479 int non_mod, uint8_t *map_table, int x_pos)
480 {
481 GetBitContext gb;
482
483 int bits;
484 int run_length;
485 int pixels_read = x_pos;
486
487 init_get_bits(&gb, *srcbuf, buf_size << 3);
488
489 destbuf += x_pos;
490
491 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
492 bits = get_bits(&gb, 4);
493
494 if (bits) {
495 if (non_mod != 1 || bits != 1) {
496 if (map_table)
497 *destbuf++ = map_table[bits];
498 else
499 *destbuf++ = bits;
500 }
501 pixels_read++;
502 } else {
503 bits = get_bits1(&gb);
504 if (bits == 0) {
505 run_length = get_bits(&gb, 3);
506
507 if (run_length == 0) {
508 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
509 return pixels_read;
510 }
511
512 run_length += 2;
513
514 if (map_table)
515 bits = map_table[0];
516 else
517 bits = 0;
518
519 while (run_length-- > 0 && pixels_read < dbuf_len) {
520 *destbuf++ = bits;
521 pixels_read++;
522 }
523 } else {
524 bits = get_bits1(&gb);
525 if (bits == 0) {
526 run_length = get_bits(&gb, 2) + 4;
527 bits = get_bits(&gb, 4);
528
529 if (non_mod == 1 && bits == 1)
530 pixels_read += run_length;
531 else {
532 if (map_table)
533 bits = map_table[bits];
534 while (run_length-- > 0 && pixels_read < dbuf_len) {
535 *destbuf++ = bits;
536 pixels_read++;
537 }
538 }
539 } else {
540 bits = get_bits(&gb, 2);
541 if (bits == 2) {
542 run_length = get_bits(&gb, 4) + 9;
543 bits = get_bits(&gb, 4);
544
545 if (non_mod == 1 && bits == 1)
546 pixels_read += run_length;
547 else {
548 if (map_table)
549 bits = map_table[bits];
550 while (run_length-- > 0 && pixels_read < dbuf_len) {
551 *destbuf++ = bits;
552 pixels_read++;
553 }
554 }
555 } else if (bits == 3) {
556 run_length = get_bits(&gb, 8) + 25;
557 bits = get_bits(&gb, 4);
558
559 if (non_mod == 1 && bits == 1)
560 pixels_read += run_length;
561 else {
562 if (map_table)
563 bits = map_table[bits];
564 while (run_length-- > 0 && pixels_read < dbuf_len) {
565 *destbuf++ = bits;
566 pixels_read++;
567 }
568 }
569 } else if (bits == 1) {
570 if (map_table)
571 bits = map_table[0];
572 else
573 bits = 0;
574 run_length = 2;
575 while (run_length-- > 0 && pixels_read < dbuf_len) {
576 *destbuf++ = bits;
577 pixels_read++;
578 }
579 } else {
580 if (map_table)
581 bits = map_table[0];
582 else
583 bits = 0;
584 *destbuf++ = bits;
585 pixels_read ++;
586 }
587 }
588 }
589 }
590 }
591
592 if (get_bits(&gb, 8))
593 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
594
595 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
596
597 return pixels_read;
598 }
599
dvbsub_read_8bit_string(AVCodecContext * avctx,uint8_t * destbuf,int dbuf_len,const uint8_t ** srcbuf,int buf_size,int non_mod,uint8_t * map_table,int x_pos)600 static int dvbsub_read_8bit_string(AVCodecContext *avctx,
601 uint8_t *destbuf, int dbuf_len,
602 const uint8_t **srcbuf, int buf_size,
603 int non_mod, uint8_t *map_table, int x_pos)
604 {
605 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
606 int bits;
607 int run_length;
608 int pixels_read = x_pos;
609
610 destbuf += x_pos;
611
612 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
613 bits = *(*srcbuf)++;
614
615 if (bits) {
616 if (non_mod != 1 || bits != 1) {
617 if (map_table)
618 *destbuf++ = map_table[bits];
619 else
620 *destbuf++ = bits;
621 }
622 pixels_read++;
623 } else {
624 bits = *(*srcbuf)++;
625 run_length = bits & 0x7f;
626 if ((bits & 0x80) == 0) {
627 if (run_length == 0) {
628 return pixels_read;
629 }
630
631 bits = 0;
632 } else {
633 bits = *(*srcbuf)++;
634 }
635 if (non_mod == 1 && bits == 1)
636 pixels_read += run_length;
637 else {
638 if (map_table)
639 bits = map_table[bits];
640 while (run_length-- > 0 && pixels_read < dbuf_len) {
641 *destbuf++ = bits;
642 pixels_read++;
643 }
644 }
645 }
646 }
647
648 if (*(*srcbuf)++)
649 av_log(avctx, AV_LOG_ERROR, "line overflow\n");
650
651 return pixels_read;
652 }
653
compute_default_clut(DVBSubContext * ctx,uint8_t * clut,AVSubtitleRect * rect,int w,int h)654 static void compute_default_clut(DVBSubContext *ctx, uint8_t *clut, AVSubtitleRect *rect, int w, int h)
655 {
656 uint8_t list[256] = {0};
657 uint8_t list_inv[256];
658 int counttab[256] = {0};
659 int (*counttab2)[256] = ctx->clut_count2;
660 int count, i, x, y;
661 ptrdiff_t stride = rect->linesize[0];
662
663 memset(ctx->clut_count2, 0 , sizeof(ctx->clut_count2));
664
665 #define V(x,y) rect->data[0][(x) + (y)*stride]
666 for (y = 0; y<h; y++) {
667 for (x = 0; x<w; x++) {
668 int v = V(x,y) + 1;
669 int vl = x ? V(x-1,y) + 1 : 0;
670 int vr = x+1<w ? V(x+1,y) + 1 : 0;
671 int vt = y ? V(x,y-1) + 1 : 0;
672 int vb = y+1<h ? V(x,y+1) + 1 : 0;
673 counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
674 counttab2[vl][v-1] ++;
675 counttab2[vr][v-1] ++;
676 counttab2[vt][v-1] ++;
677 counttab2[vb][v-1] ++;
678 }
679 }
680 #define L(x,y) list[d[(x) + (y)*stride]]
681
682 for (i = 0; i<256; i++) {
683 counttab2[i+1][i] = 0;
684 }
685 for (i = 0; i<256; i++) {
686 int bestscore = 0;
687 int bestv = 0;
688
689 for (x = 0; x < 256; x++) {
690 int scorev = 0;
691 if (list[x])
692 continue;
693 scorev += counttab2[0][x];
694 for (y = 0; y < 256; y++) {
695 scorev += list[y] * counttab2[y+1][x];
696 }
697
698 if (scorev) {
699 int score = 1024LL*scorev / counttab[x];
700 if (score > bestscore) {
701 bestscore = score;
702 bestv = x;
703 }
704 }
705 }
706 if (!bestscore)
707 break;
708 list [ bestv ] = 1;
709 list_inv[ i ] = bestv;
710 }
711
712 count = FFMAX(i - 1, 1);
713 for (i--; i >= 0; i--) {
714 int v = i * 255 / count;
715 AV_WN32(clut + 4*list_inv[i], RGBA(v/2,v,v/2,v));
716 }
717 }
718
719
save_subtitle_set(AVCodecContext * avctx,AVSubtitle * sub,int * got_output)720 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
721 {
722 DVBSubContext *ctx = avctx->priv_data;
723 DVBSubRegionDisplay *display;
724 DVBSubDisplayDefinition *display_def = ctx->display_definition;
725 DVBSubRegion *region;
726 AVSubtitleRect *rect;
727 DVBSubCLUT *clut;
728 uint32_t *clut_table;
729 int i;
730 int offset_x=0, offset_y=0;
731 int ret = 0;
732
733
734 if (display_def) {
735 offset_x = display_def->x;
736 offset_y = display_def->y;
737 }
738
739 /* Not touching AVSubtitles again*/
740 if (sub->num_rects) {
741 avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
742 return AVERROR_PATCHWELCOME;
743 }
744 for (display = ctx->display_list; display; display = display->next) {
745 region = get_region(ctx, display->region_id);
746 if (region && region->dirty)
747 sub->num_rects++;
748 }
749
750 if (ctx->compute_edt == 0) {
751 sub->end_display_time = ctx->time_out * 1000;
752 *got_output = 1;
753 } else if (ctx->prev_start != AV_NOPTS_VALUE) {
754 sub->end_display_time = av_rescale_q((sub->pts - ctx->prev_start ), AV_TIME_BASE_Q, (AVRational){ 1, 1000 }) - 1;
755 *got_output = 1;
756 }
757 if (sub->num_rects > 0) {
758
759 sub->rects = av_mallocz_array(sizeof(*sub->rects), sub->num_rects);
760 if (!sub->rects) {
761 ret = AVERROR(ENOMEM);
762 goto fail;
763 }
764
765 for (i = 0; i < sub->num_rects; i++) {
766 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
767 if (!sub->rects[i]) {
768 ret = AVERROR(ENOMEM);
769 goto fail;
770 }
771 }
772
773 i = 0;
774
775 for (display = ctx->display_list; display; display = display->next) {
776 region = get_region(ctx, display->region_id);
777
778 if (!region)
779 continue;
780
781 if (!region->dirty)
782 continue;
783
784 rect = sub->rects[i];
785 rect->x = display->x_pos + offset_x;
786 rect->y = display->y_pos + offset_y;
787 rect->w = region->width;
788 rect->h = region->height;
789 rect->nb_colors = (1 << region->depth);
790 rect->type = SUBTITLE_BITMAP;
791 rect->linesize[0] = region->width;
792
793 clut = get_clut(ctx, region->clut);
794
795 if (!clut)
796 clut = &default_clut;
797
798 switch (region->depth) {
799 case 2:
800 clut_table = clut->clut4;
801 break;
802 case 8:
803 clut_table = clut->clut256;
804 break;
805 case 4:
806 default:
807 clut_table = clut->clut16;
808 break;
809 }
810
811 rect->data[1] = av_mallocz(AVPALETTE_SIZE);
812 if (!rect->data[1]) {
813 ret = AVERROR(ENOMEM);
814 goto fail;
815 }
816 memcpy(rect->data[1], clut_table, (1 << region->depth) * sizeof(*clut_table));
817
818 rect->data[0] = av_malloc(region->buf_size);
819 if (!rect->data[0]) {
820 ret = AVERROR(ENOMEM);
821 goto fail;
822 }
823
824 memcpy(rect->data[0], region->pbuf, region->buf_size);
825
826 if ((clut == &default_clut && ctx->compute_clut == -1) || ctx->compute_clut == 1) {
827 if (!region->has_computed_clut) {
828 compute_default_clut(ctx, region->computed_clut, rect, rect->w, rect->h);
829 region->has_computed_clut = 1;
830 }
831
832 memcpy(rect->data[1], region->computed_clut, sizeof(region->computed_clut));
833 }
834
835 #if FF_API_AVPICTURE
836 FF_DISABLE_DEPRECATION_WARNINGS
837 {
838 int j;
839 for (j = 0; j < 4; j++) {
840 rect->pict.data[j] = rect->data[j];
841 rect->pict.linesize[j] = rect->linesize[j];
842 }
843 }
844 FF_ENABLE_DEPRECATION_WARNINGS
845 #endif
846
847 i++;
848 }
849 }
850
851 return 0;
852 fail:
853 if (sub->rects) {
854 for (i=0; i < sub->num_rects; i++) {
855 rect = sub->rects[i];
856 if (rect) {
857 av_freep(&rect->data[0]);
858 av_freep(&rect->data[1]);
859 }
860 av_freep(&sub->rects[i]);
861 }
862 av_freep(&sub->rects);
863 }
864 sub->num_rects = 0;
865 return ret;
866 }
867
dvbsub_parse_pixel_data_block(AVCodecContext * avctx,DVBSubObjectDisplay * display,const uint8_t * buf,int buf_size,int top_bottom,int non_mod)868 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
869 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
870 {
871 DVBSubContext *ctx = avctx->priv_data;
872
873 DVBSubRegion *region = get_region(ctx, display->region_id);
874 const uint8_t *buf_end = buf + buf_size;
875 uint8_t *pbuf;
876 int x_pos, y_pos;
877 int i;
878
879 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
880 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
881 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
882 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
883 uint8_t *map_table;
884
885 #if 0
886 ff_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
887 top_bottom ? "bottom" : "top");
888
889 for (i = 0; i < buf_size; i++) {
890 if (i % 16 == 0)
891 ff_dlog(avctx, "0x%8p: ", buf+i);
892
893 ff_dlog(avctx, "%02x ", buf[i]);
894 if (i % 16 == 15)
895 ff_dlog(avctx, "\n");
896 }
897
898 if (i % 16)
899 ff_dlog(avctx, "\n");
900 #endif
901
902 if (!region)
903 return;
904
905 pbuf = region->pbuf;
906 region->dirty = 1;
907
908 x_pos = display->x_pos;
909 y_pos = display->y_pos;
910
911 y_pos += top_bottom;
912
913 while (buf < buf_end) {
914 if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
915 av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
916 return;
917 }
918
919 switch (*buf++) {
920 case 0x10:
921 if (region->depth == 8)
922 map_table = map2to8;
923 else if (region->depth == 4)
924 map_table = map2to4;
925 else
926 map_table = NULL;
927
928 x_pos = dvbsub_read_2bit_string(avctx, pbuf + (y_pos * region->width),
929 region->width, &buf, buf_end - buf,
930 non_mod, map_table, x_pos);
931 break;
932 case 0x11:
933 if (region->depth < 4) {
934 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
935 return;
936 }
937
938 if (region->depth == 8)
939 map_table = map4to8;
940 else
941 map_table = NULL;
942
943 x_pos = dvbsub_read_4bit_string(avctx, pbuf + (y_pos * region->width),
944 region->width, &buf, buf_end - buf,
945 non_mod, map_table, x_pos);
946 break;
947 case 0x12:
948 if (region->depth < 8) {
949 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
950 return;
951 }
952
953 x_pos = dvbsub_read_8bit_string(avctx, pbuf + (y_pos * region->width),
954 region->width, &buf, buf_end - buf,
955 non_mod, NULL, x_pos);
956 break;
957
958 case 0x20:
959 map2to4[0] = (*buf) >> 4;
960 map2to4[1] = (*buf++) & 0xf;
961 map2to4[2] = (*buf) >> 4;
962 map2to4[3] = (*buf++) & 0xf;
963 break;
964 case 0x21:
965 for (i = 0; i < 4; i++)
966 map2to8[i] = *buf++;
967 break;
968 case 0x22:
969 for (i = 0; i < 16; i++)
970 map4to8[i] = *buf++;
971 break;
972
973 case 0xf0:
974 x_pos = display->x_pos;
975 y_pos += 2;
976 break;
977 default:
978 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
979 }
980 }
981
982 region->has_computed_clut = 0;
983 }
984
dvbsub_parse_object_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size)985 static int dvbsub_parse_object_segment(AVCodecContext *avctx,
986 const uint8_t *buf, int buf_size)
987 {
988 DVBSubContext *ctx = avctx->priv_data;
989
990 const uint8_t *buf_end = buf + buf_size;
991 int object_id;
992 DVBSubObject *object;
993 DVBSubObjectDisplay *display;
994 int top_field_len, bottom_field_len;
995
996 int coding_method, non_modifying_color;
997
998 object_id = AV_RB16(buf);
999 buf += 2;
1000
1001 object = get_object(ctx, object_id);
1002
1003 if (!object)
1004 return AVERROR_INVALIDDATA;
1005
1006 coding_method = ((*buf) >> 2) & 3;
1007 non_modifying_color = ((*buf++) >> 1) & 1;
1008
1009 if (coding_method == 0) {
1010 top_field_len = AV_RB16(buf);
1011 buf += 2;
1012 bottom_field_len = AV_RB16(buf);
1013 buf += 2;
1014
1015 if (buf + top_field_len + bottom_field_len > buf_end) {
1016 av_log(avctx, AV_LOG_ERROR, "Field data size %d+%d too large\n", top_field_len, bottom_field_len);
1017 return AVERROR_INVALIDDATA;
1018 }
1019
1020 for (display = object->display_list; display; display = display->object_list_next) {
1021 const uint8_t *block = buf;
1022 int bfl = bottom_field_len;
1023
1024 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
1025 non_modifying_color);
1026
1027 if (bottom_field_len > 0)
1028 block = buf + top_field_len;
1029 else
1030 bfl = top_field_len;
1031
1032 dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
1033 non_modifying_color);
1034 }
1035 } else if (coding_method == 1) {
1036 avpriv_report_missing_feature(avctx, "coded as a string of characters");
1037 return AVERROR_PATCHWELCOME;
1038 } else if (coding_method == 2) {
1039 avpriv_report_missing_feature(avctx, "progressive coding of pixels");
1040 return AVERROR_PATCHWELCOME;
1041 } else {
1042 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
1043 return AVERROR_INVALIDDATA;
1044 }
1045
1046 return 0;
1047 }
1048
dvbsub_parse_clut_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size)1049 static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
1050 const uint8_t *buf, int buf_size)
1051 {
1052 DVBSubContext *ctx = avctx->priv_data;
1053
1054 const uint8_t *buf_end = buf + buf_size;
1055 int i, clut_id;
1056 int version;
1057 DVBSubCLUT *clut;
1058 int entry_id, depth , full_range;
1059 int y, cr, cb, alpha;
1060 int r, g, b, r_add, g_add, b_add;
1061
1062 ff_dlog(avctx, "DVB clut packet:\n");
1063
1064 for (i=0; i < buf_size; i++) {
1065 ff_dlog(avctx, "%02x ", buf[i]);
1066 if (i % 16 == 15)
1067 ff_dlog(avctx, "\n");
1068 }
1069
1070 if (i % 16)
1071 ff_dlog(avctx, "\n");
1072
1073 clut_id = *buf++;
1074 version = ((*buf)>>4)&15;
1075 buf += 1;
1076
1077 clut = get_clut(ctx, clut_id);
1078
1079 if (!clut) {
1080 clut = av_malloc(sizeof(*clut));
1081 if (!clut)
1082 return AVERROR(ENOMEM);
1083
1084 memcpy(clut, &default_clut, sizeof(*clut));
1085
1086 clut->id = clut_id;
1087 clut->version = -1;
1088
1089 clut->next = ctx->clut_list;
1090 ctx->clut_list = clut;
1091 }
1092
1093 if (clut->version != version) {
1094
1095 clut->version = version;
1096
1097 while (buf + 4 < buf_end) {
1098 entry_id = *buf++;
1099
1100 depth = (*buf) & 0xe0;
1101
1102 if (depth == 0) {
1103 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
1104 }
1105
1106 full_range = (*buf++) & 1;
1107
1108 if (full_range) {
1109 y = *buf++;
1110 cr = *buf++;
1111 cb = *buf++;
1112 alpha = *buf++;
1113 } else {
1114 y = buf[0] & 0xfc;
1115 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
1116 cb = (buf[1] << 2) & 0xf0;
1117 alpha = (buf[1] << 6) & 0xc0;
1118
1119 buf += 2;
1120 }
1121
1122 if (y == 0)
1123 alpha = 0xff;
1124
1125 YUV_TO_RGB1_CCIR(cb, cr);
1126 YUV_TO_RGB2_CCIR(r, g, b, y);
1127
1128 ff_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1129 if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
1130 ff_dlog(avctx, "More than one bit level marked: %x\n", depth);
1131 if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
1132 return AVERROR_INVALIDDATA;
1133 }
1134
1135 if (depth & 0x80 && entry_id < 4)
1136 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1137 else if (depth & 0x40 && entry_id < 16)
1138 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1139 else if (depth & 0x20)
1140 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1141 }
1142 }
1143
1144 return 0;
1145 }
1146
1147
dvbsub_parse_region_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size)1148 static int dvbsub_parse_region_segment(AVCodecContext *avctx,
1149 const uint8_t *buf, int buf_size)
1150 {
1151 DVBSubContext *ctx = avctx->priv_data;
1152
1153 const uint8_t *buf_end = buf + buf_size;
1154 int region_id, object_id;
1155 int av_unused version;
1156 DVBSubRegion *region;
1157 DVBSubObject *object;
1158 DVBSubObjectDisplay *display;
1159 int fill;
1160 int ret;
1161
1162 if (buf_size < 10)
1163 return AVERROR_INVALIDDATA;
1164
1165 region_id = *buf++;
1166
1167 region = get_region(ctx, region_id);
1168
1169 if (!region) {
1170 region = av_mallocz(sizeof(*region));
1171 if (!region)
1172 return AVERROR(ENOMEM);
1173
1174 region->id = region_id;
1175 region->version = -1;
1176
1177 region->next = ctx->region_list;
1178 ctx->region_list = region;
1179 }
1180
1181 version = ((*buf)>>4) & 15;
1182 fill = ((*buf++) >> 3) & 1;
1183
1184 region->width = AV_RB16(buf);
1185 buf += 2;
1186 region->height = AV_RB16(buf);
1187 buf += 2;
1188
1189 ret = av_image_check_size2(region->width, region->height, avctx->max_pixels, AV_PIX_FMT_PAL8, 0, avctx);
1190 if (ret >= 0 && region->width * region->height * 2 > 320 * 1024 * 8) {
1191 ret = AVERROR_INVALIDDATA;
1192 av_log(avctx, AV_LOG_ERROR, "Pixel buffer memory constraint violated\n");
1193 }
1194 if (ret < 0) {
1195 region->width= region->height= 0;
1196 return ret;
1197 }
1198
1199 if (region->width * region->height != region->buf_size) {
1200 av_free(region->pbuf);
1201
1202 region->buf_size = region->width * region->height;
1203
1204 region->pbuf = av_malloc(region->buf_size);
1205 if (!region->pbuf) {
1206 region->buf_size =
1207 region->width =
1208 region->height = 0;
1209 return AVERROR(ENOMEM);
1210 }
1211
1212 fill = 1;
1213 region->dirty = 0;
1214 }
1215
1216 region->depth = 1 << (((*buf++) >> 2) & 7);
1217 if (region->depth < 2 || region->depth > 8) {
1218 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1219 region->depth= 4;
1220 }
1221 region->clut = *buf++;
1222
1223 if (region->depth == 8) {
1224 region->bgcolor = *buf++;
1225 buf += 1;
1226 } else {
1227 buf += 1;
1228
1229 if (region->depth == 4)
1230 region->bgcolor = (((*buf++) >> 4) & 15);
1231 else
1232 region->bgcolor = (((*buf++) >> 2) & 3);
1233 }
1234
1235 ff_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1236
1237 if (fill) {
1238 memset(region->pbuf, region->bgcolor, region->buf_size);
1239 ff_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1240 }
1241
1242 delete_region_display_list(ctx, region);
1243
1244 while (buf + 5 < buf_end) {
1245 object_id = AV_RB16(buf);
1246 buf += 2;
1247
1248 object = get_object(ctx, object_id);
1249
1250 if (!object) {
1251 object = av_mallocz(sizeof(*object));
1252 if (!object)
1253 return AVERROR(ENOMEM);
1254
1255 object->id = object_id;
1256 object->next = ctx->object_list;
1257 ctx->object_list = object;
1258 }
1259
1260 object->type = (*buf) >> 6;
1261
1262 display = av_mallocz(sizeof(*display));
1263 if (!display)
1264 return AVERROR(ENOMEM);
1265
1266 display->object_id = object_id;
1267 display->region_id = region_id;
1268
1269 display->x_pos = AV_RB16(buf) & 0xfff;
1270 buf += 2;
1271 display->y_pos = AV_RB16(buf) & 0xfff;
1272 buf += 2;
1273
1274 if (display->x_pos >= region->width ||
1275 display->y_pos >= region->height) {
1276 av_log(avctx, AV_LOG_ERROR, "Object outside region\n");
1277 av_free(display);
1278 return AVERROR_INVALIDDATA;
1279 }
1280
1281 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1282 display->fgcolor = *buf++;
1283 display->bgcolor = *buf++;
1284 }
1285
1286 display->region_list_next = region->display_list;
1287 region->display_list = display;
1288
1289 display->object_list_next = object->display_list;
1290 object->display_list = display;
1291 }
1292
1293 return 0;
1294 }
1295
dvbsub_parse_page_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size,AVSubtitle * sub,int * got_output)1296 static int dvbsub_parse_page_segment(AVCodecContext *avctx,
1297 const uint8_t *buf, int buf_size, AVSubtitle *sub, int *got_output)
1298 {
1299 DVBSubContext *ctx = avctx->priv_data;
1300 DVBSubRegionDisplay *display;
1301 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1302
1303 const uint8_t *buf_end = buf + buf_size;
1304 int region_id;
1305 int page_state;
1306 int timeout;
1307 int version;
1308
1309 if (buf_size < 1)
1310 return AVERROR_INVALIDDATA;
1311
1312 timeout = *buf++;
1313 version = ((*buf)>>4) & 15;
1314 page_state = ((*buf++) >> 2) & 3;
1315
1316 if (ctx->version == version) {
1317 return 0;
1318 }
1319
1320 ctx->time_out = timeout;
1321 ctx->version = version;
1322
1323 ff_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1324
1325 if (ctx->compute_edt == 1)
1326 save_subtitle_set(avctx, sub, got_output);
1327
1328 if (page_state == 1 || page_state == 2) {
1329 delete_regions(ctx);
1330 delete_objects(ctx);
1331 delete_cluts(ctx);
1332 }
1333
1334 tmp_display_list = ctx->display_list;
1335 ctx->display_list = NULL;
1336
1337 while (buf + 5 < buf_end) {
1338 region_id = *buf++;
1339 buf += 1;
1340
1341 display = ctx->display_list;
1342 while (display && display->region_id != region_id) {
1343 display = display->next;
1344 }
1345 if (display) {
1346 av_log(avctx, AV_LOG_ERROR, "duplicate region\n");
1347 break;
1348 }
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(*display));
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
png_save(DVBSubContext * ctx,const char * filename,uint32_t * bitmap,int w,int h)1392 static void png_save(DVBSubContext *ctx, const char *filename, uint32_t *bitmap, int w, int h)
1393 {
1394 int x, y, v;
1395 FILE *f;
1396 char fname[40], fname2[40];
1397 char command[1024];
1398
1399 snprintf(fname, sizeof(fname), "%s.ppm", filename);
1400
1401 f = fopen(fname, "w");
1402 if (!f) {
1403 perror(fname);
1404 return;
1405 }
1406 fprintf(f, "P6\n"
1407 "%d %d\n"
1408 "%d\n",
1409 w, h, 255);
1410 for(y = 0; y < h; y++) {
1411 for(x = 0; x < w; x++) {
1412 v = bitmap[y * w + x];
1413 putc((v >> 16) & 0xff, f);
1414 putc((v >> 8) & 0xff, f);
1415 putc((v >> 0) & 0xff, f);
1416 }
1417 }
1418 fclose(f);
1419
1420
1421 snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename);
1422
1423 f = fopen(fname2, "w");
1424 if (!f) {
1425 perror(fname2);
1426 return;
1427 }
1428 fprintf(f, "P5\n"
1429 "%d %d\n"
1430 "%d\n",
1431 w, h, 255);
1432 for(y = 0; y < h; y++) {
1433 for(x = 0; x < w; x++) {
1434 v = bitmap[y * w + x];
1435 putc((v >> 24) & 0xff, f);
1436 }
1437 }
1438 fclose(f);
1439
1440 snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
1441 if (system(command) != 0) {
1442 av_log(ctx, AV_LOG_ERROR, "Error running pnmtopng\n");
1443 return;
1444 }
1445
1446 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
1447 if (system(command) != 0) {
1448 av_log(ctx, AV_LOG_ERROR, "Error removing %s and %s\n", fname, fname2);
1449 return;
1450 }
1451 }
1452
save_display_set(DVBSubContext * ctx)1453 static int save_display_set(DVBSubContext *ctx)
1454 {
1455 DVBSubRegion *region;
1456 DVBSubRegionDisplay *display;
1457 DVBSubCLUT *clut;
1458 uint32_t *clut_table;
1459 int x_pos, y_pos, width, height;
1460 int x, y, y_off, x_off;
1461 uint32_t *pbuf;
1462 char filename[32];
1463 static int fileno_index = 0;
1464
1465 x_pos = -1;
1466 y_pos = -1;
1467 width = 0;
1468 height = 0;
1469
1470 for (display = ctx->display_list; display; display = display->next) {
1471 region = get_region(ctx, display->region_id);
1472
1473 if (!region)
1474 return -1;
1475
1476 if (x_pos == -1) {
1477 x_pos = display->x_pos;
1478 y_pos = display->y_pos;
1479 width = region->width;
1480 height = region->height;
1481 } else {
1482 if (display->x_pos < x_pos) {
1483 width += (x_pos - display->x_pos);
1484 x_pos = display->x_pos;
1485 }
1486
1487 if (display->y_pos < y_pos) {
1488 height += (y_pos - display->y_pos);
1489 y_pos = display->y_pos;
1490 }
1491
1492 if (display->x_pos + region->width > x_pos + width) {
1493 width = display->x_pos + region->width - x_pos;
1494 }
1495
1496 if (display->y_pos + region->height > y_pos + height) {
1497 height = display->y_pos + region->height - y_pos;
1498 }
1499 }
1500 }
1501
1502 if (x_pos >= 0) {
1503
1504 pbuf = av_malloc(width * height * 4);
1505 if (!pbuf)
1506 return -1;
1507
1508 for (display = ctx->display_list; display; display = display->next) {
1509 region = get_region(ctx, display->region_id);
1510
1511 if (!region)
1512 return -1;
1513
1514 x_off = display->x_pos - x_pos;
1515 y_off = display->y_pos - y_pos;
1516
1517 clut = get_clut(ctx, region->clut);
1518
1519 if (!clut)
1520 clut = &default_clut;
1521
1522 switch (region->depth) {
1523 case 2:
1524 clut_table = clut->clut4;
1525 break;
1526 case 8:
1527 clut_table = clut->clut256;
1528 break;
1529 case 4:
1530 default:
1531 clut_table = clut->clut16;
1532 break;
1533 }
1534
1535 for (y = 0; y < region->height; y++) {
1536 for (x = 0; x < region->width; x++) {
1537 pbuf[((y + y_off) * width) + x_off + x] =
1538 clut_table[region->pbuf[y * region->width + x]];
1539 }
1540 }
1541
1542 }
1543
1544 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1545
1546 png_save(ctx, filename, pbuf, width, height);
1547
1548 av_freep(&pbuf);
1549 }
1550
1551 fileno_index++;
1552 return 0;
1553 }
1554 #endif /* DEBUG */
1555
dvbsub_parse_display_definition_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size)1556 static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1557 const uint8_t *buf,
1558 int buf_size)
1559 {
1560 DVBSubContext *ctx = avctx->priv_data;
1561 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1562 int dds_version, info_byte;
1563
1564 if (buf_size < 5)
1565 return AVERROR_INVALIDDATA;
1566
1567 info_byte = bytestream_get_byte(&buf);
1568 dds_version = info_byte >> 4;
1569 if (display_def && display_def->version == dds_version)
1570 return 0; // already have this display definition version
1571
1572 if (!display_def) {
1573 display_def = av_mallocz(sizeof(*display_def));
1574 if (!display_def)
1575 return AVERROR(ENOMEM);
1576 ctx->display_definition = display_def;
1577 }
1578
1579 display_def->version = dds_version;
1580 display_def->x = 0;
1581 display_def->y = 0;
1582 display_def->width = bytestream_get_be16(&buf) + 1;
1583 display_def->height = bytestream_get_be16(&buf) + 1;
1584 if (!avctx->width || !avctx->height) {
1585 int ret = ff_set_dimensions(avctx, display_def->width, display_def->height);
1586 if (ret < 0)
1587 return ret;
1588 }
1589
1590 if (info_byte & 1<<3) { // display_window_flag
1591 if (buf_size < 13)
1592 return AVERROR_INVALIDDATA;
1593
1594 display_def->x = bytestream_get_be16(&buf);
1595 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1596 display_def->y = bytestream_get_be16(&buf);
1597 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1598 }
1599
1600 return 0;
1601 }
1602
dvbsub_display_end_segment(AVCodecContext * avctx,const uint8_t * buf,int buf_size,AVSubtitle * sub,int * got_output)1603 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1604 int buf_size, AVSubtitle *sub,int *got_output)
1605 {
1606 DVBSubContext *ctx = avctx->priv_data;
1607
1608 if (ctx->compute_edt == 0)
1609 save_subtitle_set(avctx, sub, got_output);
1610 #ifdef DEBUG
1611 save_display_set(ctx);
1612 #endif
1613 return 0;
1614 }
1615
dvbsub_decode(AVCodecContext * avctx,void * data,int * got_sub_ptr,AVPacket * avpkt)1616 static int dvbsub_decode(AVCodecContext *avctx,
1617 void *data, int *got_sub_ptr,
1618 AVPacket *avpkt)
1619 {
1620 const uint8_t *buf = avpkt->data;
1621 int buf_size = avpkt->size;
1622 DVBSubContext *ctx = avctx->priv_data;
1623 AVSubtitle *sub = data;
1624 const uint8_t *p, *p_end;
1625 int segment_type;
1626 int page_id;
1627 int segment_length;
1628 int i;
1629 int ret = 0;
1630 int got_segment = 0;
1631 int got_dds = 0;
1632
1633 ff_dlog(avctx, "DVB sub packet:\n");
1634
1635 for (i=0; i < buf_size; i++) {
1636 ff_dlog(avctx, "%02x ", buf[i]);
1637 if (i % 16 == 15)
1638 ff_dlog(avctx, "\n");
1639 }
1640
1641 if (i % 16)
1642 ff_dlog(avctx, "\n");
1643
1644 if (buf_size <= 6 || *buf != 0x0f) {
1645 ff_dlog(avctx, "incomplete or broken packet");
1646 return AVERROR_INVALIDDATA;
1647 }
1648
1649 p = buf;
1650 p_end = buf + buf_size;
1651
1652 while (p_end - p >= 6 && *p == 0x0f) {
1653 p += 1;
1654 segment_type = *p++;
1655 page_id = AV_RB16(p);
1656 p += 2;
1657 segment_length = AV_RB16(p);
1658 p += 2;
1659
1660 if (avctx->debug & FF_DEBUG_STARTCODE) {
1661 av_log(avctx, AV_LOG_DEBUG, "segment_type:%d page_id:%d segment_length:%d\n", segment_type, page_id, segment_length);
1662 }
1663
1664 if (p_end - p < segment_length) {
1665 ff_dlog(avctx, "incomplete or broken packet");
1666 ret = -1;
1667 goto end;
1668 }
1669
1670 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1671 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1672 int ret = 0;
1673 switch (segment_type) {
1674 case DVBSUB_PAGE_SEGMENT:
1675 ret = dvbsub_parse_page_segment(avctx, p, segment_length, sub, got_sub_ptr);
1676 got_segment |= 1;
1677 break;
1678 case DVBSUB_REGION_SEGMENT:
1679 ret = dvbsub_parse_region_segment(avctx, p, segment_length);
1680 got_segment |= 2;
1681 break;
1682 case DVBSUB_CLUT_SEGMENT:
1683 ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
1684 if (ret < 0) goto end;
1685 got_segment |= 4;
1686 break;
1687 case DVBSUB_OBJECT_SEGMENT:
1688 ret = dvbsub_parse_object_segment(avctx, p, segment_length);
1689 got_segment |= 8;
1690 break;
1691 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1692 ret = dvbsub_parse_display_definition_segment(avctx, p,
1693 segment_length);
1694 got_dds = 1;
1695 break;
1696 case DVBSUB_DISPLAY_SEGMENT:
1697 ret = dvbsub_display_end_segment(avctx, p, segment_length, sub, got_sub_ptr);
1698 if (got_segment == 15 && !got_dds && !avctx->width && !avctx->height) {
1699 // Default from ETSI EN 300 743 V1.3.1 (7.2.1)
1700 avctx->width = 720;
1701 avctx->height = 576;
1702 }
1703 got_segment |= 16;
1704 break;
1705 default:
1706 ff_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1707 segment_type, page_id, segment_length);
1708 break;
1709 }
1710 if (ret < 0)
1711 goto end;
1712 }
1713
1714 p += segment_length;
1715 }
1716 // Some streams do not send a display segment but if we have all the other
1717 // segments then we need no further data.
1718 if (got_segment == 15) {
1719 av_log(avctx, AV_LOG_DEBUG, "Missing display_end_segment, emulating\n");
1720 dvbsub_display_end_segment(avctx, p, 0, sub, got_sub_ptr);
1721 }
1722
1723 end:
1724 if (ret < 0) {
1725 *got_sub_ptr = 0;
1726 avsubtitle_free(sub);
1727 return ret;
1728 } else {
1729 if (ctx->compute_edt == 1)
1730 FFSWAP(int64_t, ctx->prev_start, sub->pts);
1731 }
1732
1733 return p - buf;
1734 }
1735
1736 #define DS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM
1737 #define OFFSET(x) offsetof(DVBSubContext, x)
1738 static const AVOption options[] = {
1739 {"compute_edt", "compute end of time using pts or timeout", OFFSET(compute_edt), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DS},
1740 {"compute_clut", "compute clut when not available(-1) or always(1) or never(0)", OFFSET(compute_clut), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, DS},
1741 {"dvb_substream", "", OFFSET(substream), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, DS},
1742 {NULL}
1743 };
1744 static const AVClass dvbsubdec_class = {
1745 .class_name = "DVB Sub Decoder",
1746 .item_name = av_default_item_name,
1747 .option = options,
1748 .version = LIBAVUTIL_VERSION_INT,
1749 };
1750
1751 AVCodec ff_dvbsub_decoder = {
1752 .name = "dvbsub",
1753 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1754 .type = AVMEDIA_TYPE_SUBTITLE,
1755 .id = AV_CODEC_ID_DVB_SUBTITLE,
1756 .priv_data_size = sizeof(DVBSubContext),
1757 .init = dvbsub_init_decoder,
1758 .close = dvbsub_close_decoder,
1759 .decode = dvbsub_decode,
1760 .priv_class = &dvbsubdec_class,
1761 };
1762