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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/dvbsubdec.c@ 9441

Last change on this file since 9441 was 5776, checked in by vboxsync, 17 years ago

ffmpeg: exported to OSE
File size: 42.8 KB
Line 
1/*
2 * DVB subtitle decoding for ffmpeg
3 * Copyright (c) 2005 Ian Caulfield.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "avcodec.h"
20#include "dsputil.h"
21#include "bitstream.h"
22
23//#define DEBUG
24//#define DEBUG_PACKET_CONTENTS
25//#define DEBUG_SAVE_IMAGES
26
27#define DVBSUB_PAGE_SEGMENT 0x10
28#define DVBSUB_REGION_SEGMENT 0x11
29#define DVBSUB_CLUT_SEGMENT 0x12
30#define DVBSUB_OBJECT_SEGMENT 0x13
31#define DVBSUB_DISPLAY_SEGMENT 0x80
32
33static unsigned char *cm;
34
35#ifdef DEBUG_SAVE_IMAGES
36#undef fprintf
37#if 0
38static void png_save(const char *filename, uint8_t *bitmap, int w, int h,
39 uint32_t *rgba_palette)
40{
41 int x, y, v;
42 FILE *f;
43 char fname[40], fname2[40];
44 char command[1024];
45
46 snprintf(fname, 40, "%s.ppm", filename);
47
48 f = fopen(fname, "w");
49 if (!f) {
50 perror(fname);
51 exit(1);
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 = rgba_palette[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, 40, "%s-a.pgm", filename);
69
70 f = fopen(fname2, "w");
71 if (!f) {
72 perror(fname2);
73 exit(1);
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 = rgba_palette[bitmap[y * w + x]];
82 putc((v >> 24) & 0xff, f);
83 }
84 }
85 fclose(f);
86
87 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
88 system(command);
89
90 snprintf(command, 1024, "rm %s %s", fname, fname2);
91 system(command);
92}
93#endif
94
95static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
96{
97 int x, y, v;
98 FILE *f;
99 char fname[40], fname2[40];
100 char command[1024];
101
102 snprintf(fname, 40, "%s.ppm", filename);
103
104 f = fopen(fname, "w");
105 if (!f) {
106 perror(fname);
107 exit(1);
108 }
109 fprintf(f, "P6\n"
110 "%d %d\n"
111 "%d\n",
112 w, h, 255);
113 for(y = 0; y < h; y++) {
114 for(x = 0; x < w; x++) {
115 v = bitmap[y * w + x];
116 putc((v >> 16) & 0xff, f);
117 putc((v >> 8) & 0xff, f);
118 putc((v >> 0) & 0xff, f);
119 }
120 }
121 fclose(f);
122
123
124 snprintf(fname2, 40, "%s-a.pgm", filename);
125
126 f = fopen(fname2, "w");
127 if (!f) {
128 perror(fname2);
129 exit(1);
130 }
131 fprintf(f, "P5\n"
132 "%d %d\n"
133 "%d\n",
134 w, h, 255);
135 for(y = 0; y < h; y++) {
136 for(x = 0; x < w; x++) {
137 v = bitmap[y * w + x];
138 putc((v >> 24) & 0xff, f);
139 }
140 }
141 fclose(f);
142
143 snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
144 system(command);
145
146 snprintf(command, 1024, "rm %s %s", fname, fname2);
147 system(command);
148}
149#endif
150
151#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
152
153typedef struct DVBSubCLUT {
154 int id;
155
156 uint32_t clut4[4];
157 uint32_t clut16[16];
158 uint32_t clut256[256];
159
160 struct DVBSubCLUT *next;
161} DVBSubCLUT;
162
163static DVBSubCLUT default_clut;
164
165typedef struct DVBSubObjectDisplay {
166 int object_id;
167 int region_id;
168
169 int x_pos;
170 int y_pos;
171
172 int fgcolour;
173 int bgcolour;
174
175 struct DVBSubObjectDisplay *region_list_next;
176 struct DVBSubObjectDisplay *object_list_next;
177} DVBSubObjectDisplay;
178
179typedef struct DVBSubObject {
180 int id;
181
182 int type;
183
184 DVBSubObjectDisplay *display_list;
185
186 struct DVBSubObject *next;
187} DVBSubObject;
188
189typedef struct DVBSubRegionDisplay {
190 int region_id;
191
192 int x_pos;
193 int y_pos;
194
195 struct DVBSubRegionDisplay *next;
196} DVBSubRegionDisplay;
197
198typedef struct DVBSubRegion {
199 int id;
200
201 int width;
202 int height;
203 int depth;
204
205 int clut;
206 int bgcolour;
207
208 uint8_t *pbuf;
209 int buf_size;
210
211 DVBSubObjectDisplay *display_list;
212
213 struct DVBSubRegion *next;
214} DVBSubRegion;
215
216typedef struct DVBSubContext {
217 int composition_id;
218 int ancillary_id;
219
220 int time_out;
221 DVBSubRegion *region_list;
222 DVBSubCLUT *clut_list;
223 DVBSubObject *object_list;
224
225 int display_list_size;
226 DVBSubRegionDisplay *display_list;
227} DVBSubContext;
228
229
230static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
231{
232 DVBSubObject *ptr = ctx->object_list;
233
234 while (ptr != NULL && ptr->id != object_id) {
235 ptr = ptr->next;
236 }
237
238 return ptr;
239}
240
241static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
242{
243 DVBSubCLUT *ptr = ctx->clut_list;
244
245 while (ptr != NULL && ptr->id != clut_id) {
246 ptr = ptr->next;
247 }
248
249 return ptr;
250}
251
252static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
253{
254 DVBSubRegion *ptr = ctx->region_list;
255
256 while (ptr != NULL && ptr->id != region_id) {
257 ptr = ptr->next;
258 }
259
260 return ptr;
261}
262
263static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
264{
265 DVBSubObject *object, *obj2, **obj2_ptr;
266 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
267
268 while (region->display_list != NULL) {
269 display = region->display_list;
270
271 object = get_object(ctx, display->object_id);
272
273 if (object != NULL) {
274 obj_disp = object->display_list;
275 obj_disp_ptr = &object->display_list;
276
277 while (obj_disp != NULL && obj_disp != display) {
278 obj_disp_ptr = &obj_disp->object_list_next;
279 obj_disp = obj_disp->object_list_next;
280 }
281
282 if (obj_disp) {
283 *obj_disp_ptr = obj_disp->object_list_next;
284
285 if (object->display_list == NULL) {
286 obj2 = ctx->object_list;
287 obj2_ptr = &ctx->object_list;
288
289 while (obj2 != NULL && obj2 != object) {
290 obj2_ptr = &obj2->next;
291 obj2 = obj2->next;
292 }
293
294 *obj2_ptr = obj2->next;
295
296 av_free(obj2);
297 }
298 }
299 }
300
301 region->display_list = display->region_list_next;
302
303 av_free(display);
304 }
305
306}
307
308static void delete_state(DVBSubContext *ctx)
309{
310 DVBSubRegion *region;
311 DVBSubCLUT *clut;
312
313 while (ctx->region_list != NULL)
314 {
315 region = ctx->region_list;
316
317 ctx->region_list = region->next;
318
319 delete_region_display_list(ctx, region);
320 if (region->pbuf != NULL)
321 av_free(region->pbuf);
322
323 av_free(region);
324 }
325
326 while (ctx->clut_list != NULL)
327 {
328 clut = ctx->clut_list;
329
330 ctx->clut_list = clut->next;
331
332 av_free(clut);
333 }
334
335 /* Should already be null */
336 if (ctx->object_list != NULL)
337 av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
338}
339
340static int dvbsub_init_decoder(AVCodecContext *avctx)
341{
342 int i, r, g, b, a = 0;
343 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
344
345 cm = cropTbl + MAX_NEG_CROP;
346
347 memset(avctx->priv_data, 0, sizeof(DVBSubContext));
348
349 ctx->composition_id = avctx->sub_id & 0xffff;
350 ctx->ancillary_id = avctx->sub_id >> 16;
351
352 default_clut.id = -1;
353 default_clut.next = NULL;
354
355 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
356 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
357 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
358 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
359
360 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
361 for (i = 1; i < 16; i++) {
362 if (i < 8) {
363 r = (i & 1) ? 255 : 0;
364 g = (i & 2) ? 255 : 0;
365 b = (i & 4) ? 255 : 0;
366 } else {
367 r = (i & 1) ? 127 : 0;
368 g = (i & 2) ? 127 : 0;
369 b = (i & 4) ? 127 : 0;
370 }
371 default_clut.clut16[i] = RGBA(r, g, b, 255);
372 }
373
374 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
375 for (i = 1; i < 256; i++) {
376 if (i < 8) {
377 r = (i & 1) ? 255 : 0;
378 g = (i & 2) ? 255 : 0;
379 b = (i & 4) ? 255 : 0;
380 a = 63;
381 } else {
382 switch (i & 0x88) {
383 case 0x00:
384 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
385 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
386 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
387 a = 255;
388 break;
389 case 0x08:
390 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
391 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
392 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
393 a = 127;
394 break;
395 case 0x80:
396 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
397 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
398 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
399 a = 255;
400 break;
401 case 0x88:
402 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
403 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
404 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
405 a = 255;
406 break;
407 }
408 }
409 default_clut.clut256[i] = RGBA(r, g, b, a);
410 }
411
412 return 0;
413}
414
415static int dvbsub_close_decoder(AVCodecContext *avctx)
416{
417 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
418 DVBSubRegionDisplay *display;
419
420 delete_state(ctx);
421
422 while (ctx->display_list != NULL)
423 {
424 display = ctx->display_list;
425 ctx->display_list = display->next;
426
427 av_free(display);
428 }
429
430 return 0;
431}
432
433static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
434 uint8_t **srcbuf, int buf_size,
435 int non_mod, uint8_t *map_table)
436{
437 GetBitContext gb;
438
439 int bits;
440 int run_length;
441 int pixels_read = 0;
442
443 init_get_bits(&gb, *srcbuf, buf_size << 8);
444
445 while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
446 bits = get_bits(&gb, 2);
447
448 if (bits != 0) {
449 if (non_mod != 1 || bits != 1) {
450 if (map_table != NULL)
451 *destbuf++ = map_table[bits];
452 else
453 *destbuf++ = bits;
454 }
455 pixels_read++;
456 } else {
457 bits = get_bits(&gb, 1);
458 if (bits == 1) {
459 run_length = get_bits(&gb, 3) + 3;
460 bits = get_bits(&gb, 2);
461
462 if (non_mod == 1 && bits == 1)
463 pixels_read += run_length;
464 else {
465 if (map_table != NULL)
466 bits = map_table[bits];
467 while (run_length-- > 0 && pixels_read < dbuf_len) {
468 *destbuf++ = bits;
469 pixels_read++;
470 }
471 }
472 } else {
473 bits = get_bits(&gb, 1);
474 if (bits == 0) {
475 bits = get_bits(&gb, 2);
476 if (bits == 2) {
477 run_length = get_bits(&gb, 4) + 12;
478 bits = get_bits(&gb, 2);
479
480 if (non_mod == 1 && bits == 1)
481 pixels_read += run_length;
482 else {
483 if (map_table != NULL)
484 bits = map_table[bits];
485 while (run_length-- > 0 && pixels_read < dbuf_len) {
486 *destbuf++ = bits;
487 pixels_read++;
488 }
489 }
490 } else if (bits == 3) {
491 run_length = get_bits(&gb, 8) + 29;
492 bits = get_bits(&gb, 2);
493
494 if (non_mod == 1 && bits == 1)
495 pixels_read += run_length;
496 else {
497 if (map_table != NULL)
498 bits = map_table[bits];
499 while (run_length-- > 0 && pixels_read < dbuf_len) {
500 *destbuf++ = bits;
501 pixels_read++;
502 }
503 }
504 } else if (bits == 1) {
505 pixels_read += 2;
506 if (map_table != NULL)
507 bits = map_table[0];
508 else
509 bits = 0;
510 if (pixels_read <= dbuf_len) {
511 *destbuf++ = bits;
512 *destbuf++ = bits;
513 }
514 } else {
515 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
516 return pixels_read;
517 }
518 } else {
519 if (map_table != NULL)
520 bits = map_table[0];
521 else
522 bits = 0;
523 *destbuf++ = bits;
524 pixels_read++;
525 }
526 }
527 }
528 }
529
530 if (get_bits(&gb, 6) != 0)
531 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
532
533 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
534
535 return pixels_read;
536}
537
538static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
539 uint8_t **srcbuf, int buf_size,
540 int non_mod, uint8_t *map_table)
541{
542 GetBitContext gb;
543
544 int bits;
545 int run_length;
546 int pixels_read = 0;
547
548 init_get_bits(&gb, *srcbuf, buf_size << 8);
549
550 while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
551 bits = get_bits(&gb, 4);
552
553 if (bits != 0) {
554 if (non_mod != 1 || bits != 1) {
555 if (map_table != NULL)
556 *destbuf++ = map_table[bits];
557 else
558 *destbuf++ = bits;
559 }
560 pixels_read++;
561 } else {
562 bits = get_bits(&gb, 1);
563 if (bits == 0) {
564 run_length = get_bits(&gb, 3);
565
566 if (run_length == 0) {
567 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
568 return pixels_read;
569 }
570
571 run_length += 2;
572
573 if (map_table != NULL)
574 bits = map_table[0];
575 else
576 bits = 0;
577
578 while (run_length-- > 0 && pixels_read < dbuf_len) {
579 *destbuf++ = bits;
580 pixels_read++;
581 }
582 } else {
583 bits = get_bits(&gb, 1);
584 if (bits == 0) {
585 run_length = get_bits(&gb, 2) + 4;
586 bits = get_bits(&gb, 4);
587
588 if (non_mod == 1 && bits == 1)
589 pixels_read += run_length;
590 else {
591 if (map_table != NULL)
592 bits = map_table[bits];
593 while (run_length-- > 0 && pixels_read < dbuf_len) {
594 *destbuf++ = bits;
595 pixels_read++;
596 }
597 }
598 } else {
599 bits = get_bits(&gb, 2);
600 if (bits == 2) {
601 run_length = get_bits(&gb, 4) + 9;
602 bits = get_bits(&gb, 4);
603
604 if (non_mod == 1 && bits == 1)
605 pixels_read += run_length;
606 else {
607 if (map_table != NULL)
608 bits = map_table[bits];
609 while (run_length-- > 0 && pixels_read < dbuf_len) {
610 *destbuf++ = bits;
611 pixels_read++;
612 }
613 }
614 } else if (bits == 3) {
615 run_length = get_bits(&gb, 8) + 25;
616 bits = get_bits(&gb, 4);
617
618 if (non_mod == 1 && bits == 1)
619 pixels_read += run_length;
620 else {
621 if (map_table != NULL)
622 bits = map_table[bits];
623 while (run_length-- > 0 && pixels_read < dbuf_len) {
624 *destbuf++ = bits;
625 pixels_read++;
626 }
627 }
628 } else if (bits == 1) {
629 pixels_read += 2;
630 if (map_table != NULL)
631 bits = map_table[0];
632 else
633 bits = 0;
634 if (pixels_read <= dbuf_len) {
635 *destbuf++ = bits;
636 *destbuf++ = bits;
637 }
638 } else {
639 if (map_table != NULL)
640 bits = map_table[0];
641 else
642 bits = 0;
643 *destbuf++ = bits;
644 pixels_read ++;
645 }
646 }
647 }
648 }
649 }
650
651 if (get_bits(&gb, 8) != 0)
652 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
653
654 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
655
656 return pixels_read;
657}
658
659static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
660 uint8_t **srcbuf, int buf_size,
661 int non_mod, uint8_t *map_table)
662{
663 uint8_t *sbuf_end = (*srcbuf) + buf_size;
664 int bits;
665 int run_length;
666 int pixels_read = 0;
667
668 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
669 bits = *(*srcbuf)++;
670
671 if (bits != 0) {
672 if (non_mod != 1 || bits != 1) {
673 if (map_table != NULL)
674 *destbuf++ = map_table[bits];
675 else
676 *destbuf++ = bits;
677 }
678 pixels_read++;
679 } else {
680 bits = *(*srcbuf)++;
681 run_length = bits & 0x7f;
682 if ((bits & 0x80) == 0) {
683 if (run_length == 0) {
684 return pixels_read;
685 }
686
687 if (map_table != NULL)
688 bits = map_table[0];
689 else
690 bits = 0;
691 while (run_length-- > 0 && pixels_read < dbuf_len) {
692 *destbuf++ = bits;
693 pixels_read++;
694 }
695 } else {
696 bits = *(*srcbuf)++;
697
698 if (non_mod == 1 && bits == 1)
699 pixels_read += run_length;
700 if (map_table != NULL)
701 bits = map_table[bits];
702 else while (run_length-- > 0 && pixels_read < dbuf_len) {
703 *destbuf++ = bits;
704 pixels_read++;
705 }
706 }
707 }
708 }
709
710 if (*(*srcbuf)++ != 0)
711 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
712
713 return pixels_read;
714}
715
716
717
718static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
719 uint8_t *buf, int buf_size, int top_bottom, int non_mod)
720{
721 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
722
723 DVBSubRegion *region = get_region(ctx, display->region_id);
724 uint8_t *buf_end = buf + buf_size;
725 uint8_t *pbuf;
726 int x_pos, y_pos;
727 int i;
728
729 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
730 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
731 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
732 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
733 uint8_t *map_table;
734
735#ifdef DEBUG
736 av_log(avctx, AV_LOG_INFO, "DVB pixel block size %d, %s field:\n", buf_size,
737 top_bottom ? "bottom" : "top");
738#endif
739
740#ifdef DEBUG_PACKET_CONTENTS
741 for (i = 0; i < buf_size; i++)
742 {
743 if (i % 16 == 0)
744 av_log(avctx, AV_LOG_INFO, "0x%08p: ", buf+i);
745
746 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
747 if (i % 16 == 15)
748 av_log(avctx, AV_LOG_INFO, "\n");
749 }
750
751 if (i % 16 != 0)
752 av_log(avctx, AV_LOG_INFO, "\n");
753
754#endif
755
756 if (region == 0)
757 return;
758
759 pbuf = region->pbuf;
760
761 x_pos = display->x_pos;
762 y_pos = display->y_pos;
763
764 if ((y_pos & 1) != top_bottom)
765 y_pos++;
766
767 while (buf < buf_end) {
768 if (x_pos > region->width || y_pos > region->height) {
769 av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
770 return;
771 }
772
773 switch (*buf++) {
774 case 0x10:
775 if (region->depth == 8)
776 map_table = map2to8;
777 else if (region->depth == 4)
778 map_table = map2to4;
779 else
780 map_table = NULL;
781
782 x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
783 region->width - x_pos, &buf, buf_size,
784 non_mod, map_table);
785 break;
786 case 0x11:
787 if (region->depth < 4) {
788 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
789 return;
790 }
791
792 if (region->depth == 8)
793 map_table = map4to8;
794 else
795 map_table = NULL;
796
797 x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
798 region->width - x_pos, &buf, buf_size,
799 non_mod, map_table);
800 break;
801 case 0x12:
802 if (region->depth < 8) {
803 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
804 return;
805 }
806
807 x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
808 region->width - x_pos, &buf, buf_size,
809 non_mod, NULL);
810 break;
811
812 case 0x20:
813 map2to4[0] = (*buf) >> 4;
814 map2to4[1] = (*buf++) & 0xf;
815 map2to4[2] = (*buf) >> 4;
816 map2to4[3] = (*buf++) & 0xf;
817 break;
818 case 0x21:
819 for (i = 0; i < 4; i++)
820 map2to8[i] = *buf++;
821 break;
822 case 0x22:
823 for (i = 0; i < 16; i++)
824 map4to8[i] = *buf++;
825 break;
826
827 case 0xf0:
828 x_pos = display->x_pos;
829 y_pos += 2;
830 break;
831 default:
832 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
833 }
834 }
835
836}
837
838static void dvbsub_parse_object_segment(AVCodecContext *avctx,
839 uint8_t *buf, int buf_size)
840{
841 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
842
843 uint8_t *buf_end = buf + buf_size;
844 uint8_t *block;
845 int object_id;
846 DVBSubObject *object;
847 DVBSubObjectDisplay *display;
848 int top_field_len, bottom_field_len;
849
850 int coding_method, non_modifying_colour;
851
852 object_id = BE_16(buf);
853 buf += 2;
854
855 object = get_object(ctx, object_id);
856
857 if (!object)
858 return;
859
860 coding_method = ((*buf) >> 2) & 3;
861 non_modifying_colour = ((*buf++) >> 1) & 1;
862
863 if (coding_method == 0) {
864 top_field_len = BE_16(buf);
865 buf += 2;
866 bottom_field_len = BE_16(buf);
867 buf += 2;
868
869 if (buf + top_field_len + bottom_field_len > buf_end) {
870 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
871 return;
872 }
873
874 for (display = object->display_list; display != 0; display = display->object_list_next) {
875 block = buf;
876
877 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
878 non_modifying_colour);
879
880 if (bottom_field_len > 0)
881 block = buf + top_field_len;
882 else
883 bottom_field_len = top_field_len;
884
885 dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
886 non_modifying_colour);
887 }
888
889/* } else if (coding_method == 1) {*/
890
891 } else {
892 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
893 }
894
895}
896
897#define SCALEBITS 10
898#define ONE_HALF (1 << (SCALEBITS - 1))
899#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
900
901#define YUV_TO_RGB1_CCIR(cb1, cr1)\
902{\
903 cb = (cb1) - 128;\
904 cr = (cr1) - 128;\
905 r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;\
906 g_add = - FIX(0.34414*255.0/224.0) * cb - FIX(0.71414*255.0/224.0) * cr + \
907 ONE_HALF;\
908 b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;\
909}
910
911#define YUV_TO_RGB2_CCIR(r, g, b, y1)\
912{\
913 y = ((y1) - 16) * FIX(255.0/219.0);\
914 r = cm[(y + r_add) >> SCALEBITS];\
915 g = cm[(y + g_add) >> SCALEBITS];\
916 b = cm[(y + b_add) >> SCALEBITS];\
917}
918
919
920static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
921 uint8_t *buf, int buf_size)
922{
923 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
924
925 uint8_t *buf_end = buf + buf_size;
926 int clut_id;
927 DVBSubCLUT *clut;
928 int entry_id, depth , full_range;
929 int y, cr, cb, alpha;
930 int r, g, b, r_add, g_add, b_add;
931
932#ifdef DEBUG_PACKET_CONTENTS
933 int i;
934
935 av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");
936
937 for (i=0; i < buf_size; i++)
938 {
939 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
940 if (i % 16 == 15)
941 av_log(avctx, AV_LOG_INFO, "\n");
942 }
943
944 if (i % 16 != 0)
945 av_log(avctx, AV_LOG_INFO, "\n");
946
947#endif
948
949 clut_id = *buf++;
950 buf += 1;
951
952 clut = get_clut(ctx, clut_id);
953
954 if (clut == NULL) {
955 clut = av_malloc(sizeof(DVBSubCLUT));
956
957 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
958
959 clut->id = clut_id;
960
961 clut->next = ctx->clut_list;
962 ctx->clut_list = clut;
963 }
964
965 while (buf + 4 < buf_end)
966 {
967 entry_id = *buf++;
968
969 depth = (*buf) & 0xe0;
970
971 if (depth == 0) {
972 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
973 return;
974 }
975
976 full_range = (*buf++) & 1;
977
978 if (full_range) {
979 y = *buf++;
980 cr = *buf++;
981 cb = *buf++;
982 alpha = *buf++;
983 } else {
984 y = buf[0] & 0xfc;
985 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
986 cb = (buf[1] << 2) & 0xf0;
987 alpha = (buf[1] << 6) & 0xc0;
988
989 buf += 2;
990 }
991
992 if (y == 0)
993 alpha = 0xff;
994
995 YUV_TO_RGB1_CCIR(cb, cr);
996 YUV_TO_RGB2_CCIR(r, g, b, y);
997
998#ifdef DEBUG
999 av_log(avctx, AV_LOG_INFO, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
1000#endif
1001
1002 if (depth & 0x80)
1003 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
1004 if (depth & 0x40)
1005 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
1006 if (depth & 0x20)
1007 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
1008 }
1009}
1010
1011
1012static void dvbsub_parse_region_segment(AVCodecContext *avctx,
1013 uint8_t *buf, int buf_size)
1014{
1015 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1016
1017 uint8_t *buf_end = buf + buf_size;
1018 int region_id, object_id;
1019 DVBSubRegion *region;
1020 DVBSubObject *object;
1021 DVBSubObjectDisplay *display;
1022 int fill;
1023
1024 if (buf_size < 10)
1025 return;
1026
1027 region_id = *buf++;
1028
1029 region = get_region(ctx, region_id);
1030
1031 if (region == NULL)
1032 {
1033 region = av_mallocz(sizeof(DVBSubRegion));
1034
1035 region->id = region_id;
1036
1037 region->next = ctx->region_list;
1038 ctx->region_list = region;
1039 }
1040
1041 fill = ((*buf++) >> 3) & 1;
1042
1043 region->width = BE_16(buf);
1044 buf += 2;
1045 region->height = BE_16(buf);
1046 buf += 2;
1047
1048 if (region->width * region->height != region->buf_size) {
1049 if (region->pbuf != 0)
1050 av_free(region->pbuf);
1051
1052 region->buf_size = region->width * region->height;
1053
1054 region->pbuf = av_malloc(region->buf_size);
1055
1056 fill = 1;
1057 }
1058
1059 region->depth = 1 << (((*buf++) >> 2) & 7);
1060 region->clut = *buf++;
1061
1062 if (region->depth == 8)
1063 region->bgcolour = *buf++;
1064 else {
1065 buf += 1;
1066
1067 if (region->depth == 4)
1068 region->bgcolour = (((*buf++) >> 4) & 15);
1069 else
1070 region->bgcolour = (((*buf++) >> 2) & 3);
1071 }
1072
1073#ifdef DEBUG
1074 av_log(avctx, AV_LOG_INFO, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1075#endif
1076
1077 if (fill) {
1078 memset(region->pbuf, region->bgcolour, region->buf_size);
1079#ifdef DEBUG
1080 av_log(avctx, AV_LOG_INFO, "Fill region (%d)\n", region->bgcolour);
1081#endif
1082 }
1083
1084 delete_region_display_list(ctx, region);
1085
1086 while (buf + 5 < buf_end) {
1087 object_id = BE_16(buf);
1088 buf += 2;
1089
1090 object = get_object(ctx, object_id);
1091
1092 if (object == NULL) {
1093 object = av_mallocz(sizeof(DVBSubObject));
1094
1095 object->id = object_id;
1096 object->next = ctx->object_list;
1097 ctx->object_list = object;
1098 }
1099
1100 object->type = (*buf) >> 6;
1101
1102 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1103
1104 display->object_id = object_id;
1105 display->region_id = region_id;
1106
1107 display->x_pos = BE_16(buf) & 0xfff;
1108 buf += 2;
1109 display->y_pos = BE_16(buf) & 0xfff;
1110 buf += 2;
1111
1112 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1113 display->fgcolour = *buf++;
1114 display->bgcolour = *buf++;
1115 }
1116
1117 display->region_list_next = region->display_list;
1118 region->display_list = display;
1119
1120 display->object_list_next = object->display_list;
1121 object->display_list = display;
1122 }
1123}
1124
1125static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1126 uint8_t *buf, int buf_size)
1127{
1128 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1129 DVBSubRegionDisplay *display;
1130 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1131
1132 uint8_t *buf_end = buf + buf_size;
1133 int region_id;
1134 int page_state;
1135
1136 if (buf_size < 1)
1137 return;
1138
1139 ctx->time_out = *buf++;
1140 page_state = ((*buf++) >> 2) & 3;
1141
1142#ifdef DEBUG
1143 av_log(avctx, AV_LOG_INFO, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1144#endif
1145
1146 if (page_state == 2)
1147 {
1148 delete_state(ctx);
1149 }
1150
1151 tmp_display_list = ctx->display_list;
1152 ctx->display_list = NULL;
1153 ctx->display_list_size = 0;
1154
1155 while (buf + 5 < buf_end) {
1156 region_id = *buf++;
1157 buf += 1;
1158
1159 display = tmp_display_list;
1160 tmp_ptr = &tmp_display_list;
1161
1162 while (display != NULL && display->region_id != region_id) {
1163 tmp_ptr = &display->next;
1164 display = display->next;
1165 }
1166
1167 if (display == NULL)
1168 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1169
1170 display->region_id = region_id;
1171
1172 display->x_pos = BE_16(buf);
1173 buf += 2;
1174 display->y_pos = BE_16(buf);
1175 buf += 2;
1176
1177 *tmp_ptr = display->next;
1178
1179 display->next = ctx->display_list;
1180 ctx->display_list = display;
1181 ctx->display_list_size++;
1182
1183#ifdef DEBUG
1184 av_log(avctx, AV_LOG_INFO, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1185#endif
1186 }
1187
1188 while (tmp_display_list != 0) {
1189 display = tmp_display_list;
1190
1191 tmp_display_list = display->next;
1192
1193 av_free(display);
1194 }
1195
1196}
1197
1198
1199#ifdef DEBUG_SAVE_IMAGES
1200static void save_display_set(DVBSubContext *ctx)
1201{
1202 DVBSubRegion *region;
1203 DVBSubRegionDisplay *display;
1204 DVBSubCLUT *clut;
1205 uint32_t *clut_table;
1206 int x_pos, y_pos, width, height;
1207 int x, y, y_off, x_off;
1208 uint32_t *pbuf;
1209 char filename[32];
1210 static int fileno_index = 0;
1211
1212 x_pos = -1;
1213 y_pos = -1;
1214 width = 0;
1215 height = 0;
1216
1217 for (display = ctx->display_list; display != NULL; display = display->next) {
1218 region = get_region(ctx, display->region_id);
1219
1220 if (x_pos == -1) {
1221 x_pos = display->x_pos;
1222 y_pos = display->y_pos;
1223 width = region->width;
1224 height = region->height;
1225 } else {
1226 if (display->x_pos < x_pos) {
1227 width += (x_pos - display->x_pos);
1228 x_pos = display->x_pos;
1229 }
1230
1231 if (display->y_pos < y_pos) {
1232 height += (y_pos - display->y_pos);
1233 y_pos = display->y_pos;
1234 }
1235
1236 if (display->x_pos + region->width > x_pos + width) {
1237 width = display->x_pos + region->width - x_pos;
1238 }
1239
1240 if (display->y_pos + region->height > y_pos + height) {
1241 height = display->y_pos + region->height - y_pos;
1242 }
1243 }
1244 }
1245
1246 if (x_pos >= 0) {
1247
1248 pbuf = av_malloc(width * height * 4);
1249
1250 for (display = ctx->display_list; display != NULL; display = display->next) {
1251 region = get_region(ctx, display->region_id);
1252
1253 x_off = display->x_pos - x_pos;
1254 y_off = display->y_pos - y_pos;
1255
1256 clut = get_clut(ctx, region->clut);
1257
1258 if (clut == 0)
1259 clut = &default_clut;
1260
1261 switch (region->depth) {
1262 case 2:
1263 clut_table = clut->clut4;
1264 break;
1265 case 8:
1266 clut_table = clut->clut256;
1267 break;
1268 case 4:
1269 default:
1270 clut_table = clut->clut16;
1271 break;
1272 }
1273
1274 for (y = 0; y < region->height; y++) {
1275 for (x = 0; x < region->width; x++) {
1276 pbuf[((y + y_off) * width) + x_off + x] =
1277 clut_table[region->pbuf[y * region->width + x]];
1278 }
1279 }
1280
1281 }
1282
1283 snprintf(filename, 32, "dvbs.%d", fileno_index);
1284
1285 png_save2(filename, pbuf, width, height);
1286
1287 av_free(pbuf);
1288 }
1289
1290 fileno_index++;
1291}
1292#endif
1293
1294static int dvbsub_display_end_segment(AVCodecContext *avctx, uint8_t *buf,
1295 int buf_size, AVSubtitle *sub)
1296{
1297 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1298
1299 DVBSubRegion *region;
1300 DVBSubRegionDisplay *display;
1301 AVSubtitleRect *rect;
1302 DVBSubCLUT *clut;
1303 uint32_t *clut_table;
1304 int i;
1305
1306 sub->rects = NULL;
1307 sub->start_display_time = 0;
1308 sub->end_display_time = ctx->time_out * 1000;
1309 sub->format = 0;
1310
1311 sub->num_rects = ctx->display_list_size;
1312
1313 if (sub->num_rects > 0)
1314 sub->rects = av_mallocz(sizeof(AVSubtitleRect) * sub->num_rects);
1315
1316 i = 0;
1317
1318 for (display = ctx->display_list; display != NULL; display = display->next) {
1319 region = get_region(ctx, display->region_id);
1320 rect = &sub->rects[i];
1321
1322 if (region == NULL)
1323 continue;
1324
1325 rect->x = display->x_pos;
1326 rect->y = display->y_pos;
1327 rect->w = region->width;
1328 rect->h = region->height;
1329 rect->nb_colors = 16;
1330 rect->linesize = region->width;
1331
1332 clut = get_clut(ctx, region->clut);
1333
1334 if (clut == NULL)
1335 clut = &default_clut;
1336
1337 switch (region->depth) {
1338 case 2:
1339 clut_table = clut->clut4;
1340 break;
1341 case 8:
1342 clut_table = clut->clut256;
1343 break;
1344 case 4:
1345 default:
1346 clut_table = clut->clut16;
1347 break;
1348 }
1349
1350 rect->rgba_palette = av_malloc((1 << region->depth) * sizeof(uint32_t));
1351 memcpy(rect->rgba_palette, clut_table, (1 << region->depth) * sizeof(uint32_t));
1352
1353 rect->bitmap = av_malloc(region->buf_size);
1354 memcpy(rect->bitmap, region->pbuf, region->buf_size);
1355
1356 i++;
1357 }
1358
1359 sub->num_rects = i;
1360
1361#ifdef DEBUG_SAVE_IMAGES
1362 save_display_set(ctx);
1363#endif
1364
1365 return 1;
1366}
1367
1368static int dvbsub_decode(AVCodecContext *avctx,
1369 void *data, int *data_size,
1370 uint8_t *buf, int buf_size)
1371{
1372 DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
1373 AVSubtitle *sub = (AVSubtitle*) data;
1374 uint8_t *p, *p_end;
1375 int segment_type;
1376 int page_id;
1377 int segment_length;
1378
1379#ifdef DEBUG_PACKET_CONTENTS
1380 int i;
1381
1382 av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");
1383
1384 for (i=0; i < buf_size; i++)
1385 {
1386 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1387 if (i % 16 == 15)
1388 av_log(avctx, AV_LOG_INFO, "\n");
1389 }
1390
1391 if (i % 16 != 0)
1392 av_log(avctx, AV_LOG_INFO, "\n");
1393
1394#endif
1395
1396 if (buf_size <= 2)
1397 return -1;
1398
1399 p = buf;
1400 p_end = buf + buf_size;
1401
1402 while (p < p_end && *p == 0x0f)
1403 {
1404 p += 1;
1405 segment_type = *p++;
1406 page_id = BE_16(p);
1407 p += 2;
1408 segment_length = BE_16(p);
1409 p += 2;
1410
1411 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
1412 switch (segment_type) {
1413 case DVBSUB_PAGE_SEGMENT:
1414 dvbsub_parse_page_segment(avctx, p, segment_length);
1415 break;
1416 case DVBSUB_REGION_SEGMENT:
1417 dvbsub_parse_region_segment(avctx, p, segment_length);
1418 break;
1419 case DVBSUB_CLUT_SEGMENT:
1420 dvbsub_parse_clut_segment(avctx, p, segment_length);
1421 break;
1422 case DVBSUB_OBJECT_SEGMENT:
1423 dvbsub_parse_object_segment(avctx, p, segment_length);
1424 break;
1425 case DVBSUB_DISPLAY_SEGMENT:
1426 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1427 break;
1428 default:
1429#ifdef DEBUG
1430 av_log(avctx, AV_LOG_INFO, "Subtitling segment type 0x%x, page id %d, length %d\n",
1431 segment_type, page_id, segment_length);
1432#endif
1433 break;
1434 }
1435 }
1436
1437 p += segment_length;
1438 }
1439
1440 if (p != p_end)
1441 {
1442#ifdef DEBUG
1443 av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1444#endif
1445 return -1;
1446 }
1447
1448 return buf_size;
1449}
1450
1451
1452AVCodec dvbsub_decoder = {
1453 "dvbsub",
1454 CODEC_TYPE_SUBTITLE,
1455 CODEC_ID_DVB_SUBTITLE,
1456 sizeof(DVBSubContext),
1457 dvbsub_init_decoder,
1458 NULL,
1459 dvbsub_close_decoder,
1460 dvbsub_decode,
1461};
1462
1463/* Parser (mostly) copied from dvdsub.c */
1464
1465#define PARSE_BUF_SIZE (65536)
1466
1467
1468/* parser definition */
1469typedef struct DVBSubParseContext {
1470 uint8_t *packet_buf;
1471 int packet_start;
1472 int packet_index;
1473 int in_packet;
1474} DVBSubParseContext;
1475
1476static int dvbsub_parse_init(AVCodecParserContext *s)
1477{
1478 DVBSubParseContext *pc = s->priv_data;
1479 pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
1480
1481 return 0;
1482}
1483
1484static int dvbsub_parse(AVCodecParserContext *s,
1485 AVCodecContext *avctx,
1486 uint8_t **poutbuf, int *poutbuf_size,
1487 const uint8_t *buf, int buf_size)
1488{
1489 DVBSubParseContext *pc = s->priv_data;
1490 uint8_t *p, *p_end;
1491 int len, buf_pos = 0;
1492
1493#ifdef DEBUG
1494 av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%Lx, lpts=%Lx, cpts=%Lx:\n",
1495 s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
1496#endif
1497
1498#ifdef DEBUG_PACKET_CONTENTS
1499 int i;
1500
1501 for (i=0; i < buf_size; i++)
1502 {
1503 av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
1504 if (i % 16 == 15)
1505 av_log(avctx, AV_LOG_INFO, "\n");
1506 }
1507
1508 if (i % 16 != 0)
1509 av_log(avctx, AV_LOG_INFO, "\n");
1510
1511#endif
1512
1513 *poutbuf = NULL;
1514 *poutbuf_size = 0;
1515
1516 s->fetch_timestamp = 1;
1517
1518 if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
1519 {
1520 if (pc->packet_index != pc->packet_start)
1521 {
1522#ifdef DEBUG
1523 av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n",
1524 pc->packet_index - pc->packet_start);
1525#endif
1526 }
1527
1528 pc->packet_start = 0;
1529 pc->packet_index = 0;
1530
1531 if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
1532#ifdef DEBUG
1533 av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
1534#endif
1535 return -1;
1536 }
1537
1538 buf_pos = 2;
1539
1540 pc->in_packet = 1;
1541 } else {
1542 if (pc->packet_start != 0)
1543 {
1544 if (pc->packet_index != pc->packet_start)
1545 {
1546 memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
1547 pc->packet_index - pc->packet_start);
1548
1549 pc->packet_index -= pc->packet_start;
1550 pc->packet_start = 0;
1551 } else {
1552 pc->packet_start = 0;
1553 pc->packet_index = 0;
1554 }
1555 }
1556 }
1557
1558 if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
1559 return -1;
1560
1561/* if not currently in a packet, discard data */
1562 if (pc->in_packet == 0)
1563 return buf_size;
1564
1565 memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
1566 pc->packet_index += buf_size - buf_pos;
1567
1568 p = pc->packet_buf;
1569 p_end = pc->packet_buf + pc->packet_index;
1570
1571 while (p < p_end)
1572 {
1573 if (*p == 0x0f)
1574 {
1575 if (p + 6 <= p_end)
1576 {
1577 len = BE_16(p + 4);
1578
1579 if (p + len + 6 <= p_end)
1580 {
1581 *poutbuf_size += len + 6;
1582
1583 p += len + 6;
1584 } else
1585 break;
1586 } else
1587 break;
1588 } else if (*p == 0xff) {
1589 if (p + 1 < p_end)
1590 {
1591#ifdef DEBUG
1592 av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
1593#endif
1594 }
1595 pc->packet_index = p - pc->packet_buf;
1596 pc->in_packet = 0;
1597 break;
1598 } else {
1599 av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
1600
1601 pc->packet_index = p - pc->packet_buf;
1602 pc->in_packet = 0;
1603 break;
1604 }
1605 }
1606
1607 if (*poutbuf_size > 0)
1608 {
1609 *poutbuf = pc->packet_buf;
1610 pc->packet_start = *poutbuf_size;
1611 }
1612
1613 if (s->last_pts == AV_NOPTS_VALUE)
1614 s->last_pts = s->pts;
1615
1616 return buf_size;
1617}
1618
1619static void dvbsub_parse_close(AVCodecParserContext *s)
1620{
1621 DVBSubParseContext *pc = s->priv_data;
1622 av_freep(&pc->packet_buf);
1623}
1624
1625AVCodecParser dvbsub_parser = {
1626 { CODEC_ID_DVB_SUBTITLE },
1627 sizeof(DVBSubParseContext),
1628 dvbsub_parse_init,
1629 dvbsub_parse,
1630 dvbsub_parse_close,
1631};
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