47820229851ff560d478cb87a8fddf701b8276a7
[libav.git] / libavcodec / dvbsubdec.c
1 /*
2 * DVB subtitle decoding
3 * Copyright (c) 2005 Ian Caulfield
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 #include "avcodec.h"
22 #include "dsputil.h"
23 #include "get_bits.h"
24 #include "bytestream.h"
25 #include "libavutil/colorspace.h"
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_DISPLAYDEFINITION_SEGMENT 0x14
32 #define DVBSUB_DISPLAY_SEGMENT 0x80
33
34 #define cm (ff_crop_tab + MAX_NEG_CROP)
35
36 #ifdef DEBUG
37 #if 0
38 static 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 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 = 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 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 = 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
95 static 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, sizeof(fname), "%s.ppm", filename);
103
104 f = fopen(fname, "w");
105 if (!f) {
106 perror(fname);
107 return;
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, sizeof(fname2), "%s-a.pgm", filename);
125
126 f = fopen(fname2, "w");
127 if (!f) {
128 perror(fname2);
129 return;
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, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename);
144 system(command);
145
146 snprintf(command, sizeof(command), "rm %s %s", fname, fname2);
147 system(command);
148 }
149 #endif
150
151 #define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
152
153 typedef 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
163 static DVBSubCLUT default_clut;
164
165 typedef struct DVBSubObjectDisplay {
166 int object_id;
167 int region_id;
168
169 int x_pos;
170 int y_pos;
171
172 int fgcolor;
173 int bgcolor;
174
175 struct DVBSubObjectDisplay *region_list_next;
176 struct DVBSubObjectDisplay *object_list_next;
177 } DVBSubObjectDisplay;
178
179 typedef struct DVBSubObject {
180 int id;
181
182 int type;
183
184 DVBSubObjectDisplay *display_list;
185
186 struct DVBSubObject *next;
187 } DVBSubObject;
188
189 typedef struct DVBSubRegionDisplay {
190 int region_id;
191
192 int x_pos;
193 int y_pos;
194
195 struct DVBSubRegionDisplay *next;
196 } DVBSubRegionDisplay;
197
198 typedef struct DVBSubRegion {
199 int id;
200
201 int width;
202 int height;
203 int depth;
204
205 int clut;
206 int bgcolor;
207
208 uint8_t *pbuf;
209 int buf_size;
210
211 DVBSubObjectDisplay *display_list;
212
213 struct DVBSubRegion *next;
214 } DVBSubRegion;
215
216 typedef struct DVBSubDisplayDefinition {
217 int version;
218
219 int x;
220 int y;
221 int width;
222 int height;
223 } DVBSubDisplayDefinition;
224
225 typedef struct DVBSubContext {
226 int composition_id;
227 int ancillary_id;
228
229 int time_out;
230 DVBSubRegion *region_list;
231 DVBSubCLUT *clut_list;
232 DVBSubObject *object_list;
233
234 int display_list_size;
235 DVBSubRegionDisplay *display_list;
236 DVBSubDisplayDefinition *display_definition;
237 } DVBSubContext;
238
239
240 static DVBSubObject* get_object(DVBSubContext *ctx, int object_id)
241 {
242 DVBSubObject *ptr = ctx->object_list;
243
244 while (ptr && ptr->id != object_id) {
245 ptr = ptr->next;
246 }
247
248 return ptr;
249 }
250
251 static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id)
252 {
253 DVBSubCLUT *ptr = ctx->clut_list;
254
255 while (ptr && ptr->id != clut_id) {
256 ptr = ptr->next;
257 }
258
259 return ptr;
260 }
261
262 static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id)
263 {
264 DVBSubRegion *ptr = ctx->region_list;
265
266 while (ptr && ptr->id != region_id) {
267 ptr = ptr->next;
268 }
269
270 return ptr;
271 }
272
273 static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
274 {
275 DVBSubObject *object, *obj2, **obj2_ptr;
276 DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;
277
278 while (region->display_list) {
279 display = region->display_list;
280
281 object = get_object(ctx, display->object_id);
282
283 if (object) {
284 obj_disp_ptr = &object->display_list;
285 obj_disp = *obj_disp_ptr;
286
287 while (obj_disp && obj_disp != display) {
288 obj_disp_ptr = &obj_disp->object_list_next;
289 obj_disp = *obj_disp_ptr;
290 }
291
292 if (obj_disp) {
293 *obj_disp_ptr = obj_disp->object_list_next;
294
295 if (!object->display_list) {
296 obj2_ptr = &ctx->object_list;
297 obj2 = *obj2_ptr;
298
299 while (obj2 != object) {
300 assert(obj2);
301 obj2_ptr = &obj2->next;
302 obj2 = *obj2_ptr;
303 }
304
305 *obj2_ptr = obj2->next;
306
307 av_free(obj2);
308 }
309 }
310 }
311
312 region->display_list = display->region_list_next;
313
314 av_free(display);
315 }
316
317 }
318
319 static void delete_state(DVBSubContext *ctx)
320 {
321 DVBSubRegion *region;
322 DVBSubCLUT *clut;
323
324 while (ctx->region_list) {
325 region = ctx->region_list;
326
327 ctx->region_list = region->next;
328
329 delete_region_display_list(ctx, region);
330 av_free(region->pbuf);
331 av_free(region);
332 }
333
334 while (ctx->clut_list) {
335 clut = ctx->clut_list;
336
337 ctx->clut_list = clut->next;
338
339 av_free(clut);
340 }
341
342 av_freep(&ctx->display_definition);
343
344 /* Should already be null */
345 if (ctx->object_list)
346 av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
347 }
348
349 static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
350 {
351 int i, r, g, b, a = 0;
352 DVBSubContext *ctx = avctx->priv_data;
353
354 if (!avctx->extradata || avctx->extradata_size != 4) {
355 av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
356 ctx->composition_id = -1;
357 ctx->ancillary_id = -1;
358 } else {
359 ctx->composition_id = AV_RB16(avctx->extradata);
360 ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
361 }
362
363 default_clut.id = -1;
364 default_clut.next = NULL;
365
366 default_clut.clut4[0] = RGBA( 0, 0, 0, 0);
367 default_clut.clut4[1] = RGBA(255, 255, 255, 255);
368 default_clut.clut4[2] = RGBA( 0, 0, 0, 255);
369 default_clut.clut4[3] = RGBA(127, 127, 127, 255);
370
371 default_clut.clut16[0] = RGBA( 0, 0, 0, 0);
372 for (i = 1; i < 16; i++) {
373 if (i < 8) {
374 r = (i & 1) ? 255 : 0;
375 g = (i & 2) ? 255 : 0;
376 b = (i & 4) ? 255 : 0;
377 } else {
378 r = (i & 1) ? 127 : 0;
379 g = (i & 2) ? 127 : 0;
380 b = (i & 4) ? 127 : 0;
381 }
382 default_clut.clut16[i] = RGBA(r, g, b, 255);
383 }
384
385 default_clut.clut256[0] = RGBA( 0, 0, 0, 0);
386 for (i = 1; i < 256; i++) {
387 if (i < 8) {
388 r = (i & 1) ? 255 : 0;
389 g = (i & 2) ? 255 : 0;
390 b = (i & 4) ? 255 : 0;
391 a = 63;
392 } else {
393 switch (i & 0x88) {
394 case 0x00:
395 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
396 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
397 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
398 a = 255;
399 break;
400 case 0x08:
401 r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
402 g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
403 b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
404 a = 127;
405 break;
406 case 0x80:
407 r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
408 g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
409 b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
410 a = 255;
411 break;
412 case 0x88:
413 r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
414 g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
415 b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
416 a = 255;
417 break;
418 }
419 }
420 default_clut.clut256[i] = RGBA(r, g, b, a);
421 }
422
423 return 0;
424 }
425
426 static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
427 {
428 DVBSubContext *ctx = avctx->priv_data;
429 DVBSubRegionDisplay *display;
430
431 delete_state(ctx);
432
433 while (ctx->display_list) {
434 display = ctx->display_list;
435 ctx->display_list = display->next;
436
437 av_free(display);
438 }
439
440 return 0;
441 }
442
443 static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
444 const uint8_t **srcbuf, int buf_size,
445 int non_mod, uint8_t *map_table)
446 {
447 GetBitContext gb;
448
449 int bits;
450 int run_length;
451 int pixels_read = 0;
452
453 init_get_bits(&gb, *srcbuf, buf_size << 3);
454
455 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
456 bits = get_bits(&gb, 2);
457
458 if (bits) {
459 if (non_mod != 1 || bits != 1) {
460 if (map_table)
461 *destbuf++ = map_table[bits];
462 else
463 *destbuf++ = bits;
464 }
465 pixels_read++;
466 } else {
467 bits = get_bits1(&gb);
468 if (bits == 1) {
469 run_length = get_bits(&gb, 3) + 3;
470 bits = get_bits(&gb, 2);
471
472 if (non_mod == 1 && bits == 1)
473 pixels_read += run_length;
474 else {
475 if (map_table)
476 bits = map_table[bits];
477 while (run_length-- > 0 && pixels_read < dbuf_len) {
478 *destbuf++ = bits;
479 pixels_read++;
480 }
481 }
482 } else {
483 bits = get_bits1(&gb);
484 if (bits == 0) {
485 bits = get_bits(&gb, 2);
486 if (bits == 2) {
487 run_length = get_bits(&gb, 4) + 12;
488 bits = get_bits(&gb, 2);
489
490 if (non_mod == 1 && bits == 1)
491 pixels_read += run_length;
492 else {
493 if (map_table)
494 bits = map_table[bits];
495 while (run_length-- > 0 && pixels_read < dbuf_len) {
496 *destbuf++ = bits;
497 pixels_read++;
498 }
499 }
500 } else if (bits == 3) {
501 run_length = get_bits(&gb, 8) + 29;
502 bits = get_bits(&gb, 2);
503
504 if (non_mod == 1 && bits == 1)
505 pixels_read += run_length;
506 else {
507 if (map_table)
508 bits = map_table[bits];
509 while (run_length-- > 0 && pixels_read < dbuf_len) {
510 *destbuf++ = bits;
511 pixels_read++;
512 }
513 }
514 } else if (bits == 1) {
515 pixels_read += 2;
516 if (map_table)
517 bits = map_table[0];
518 else
519 bits = 0;
520 if (pixels_read <= dbuf_len) {
521 *destbuf++ = bits;
522 *destbuf++ = bits;
523 }
524 } else {
525 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
526 return pixels_read;
527 }
528 } else {
529 if (map_table)
530 bits = map_table[0];
531 else
532 bits = 0;
533 *destbuf++ = bits;
534 pixels_read++;
535 }
536 }
537 }
538 }
539
540 if (get_bits(&gb, 6))
541 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
542
543 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
544
545 return pixels_read;
546 }
547
548 static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
549 const uint8_t **srcbuf, int buf_size,
550 int non_mod, uint8_t *map_table)
551 {
552 GetBitContext gb;
553
554 int bits;
555 int run_length;
556 int pixels_read = 0;
557
558 init_get_bits(&gb, *srcbuf, buf_size << 3);
559
560 while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
561 bits = get_bits(&gb, 4);
562
563 if (bits) {
564 if (non_mod != 1 || bits != 1) {
565 if (map_table)
566 *destbuf++ = map_table[bits];
567 else
568 *destbuf++ = bits;
569 }
570 pixels_read++;
571 } else {
572 bits = get_bits1(&gb);
573 if (bits == 0) {
574 run_length = get_bits(&gb, 3);
575
576 if (run_length == 0) {
577 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
578 return pixels_read;
579 }
580
581 run_length += 2;
582
583 if (map_table)
584 bits = map_table[0];
585 else
586 bits = 0;
587
588 while (run_length-- > 0 && pixels_read < dbuf_len) {
589 *destbuf++ = bits;
590 pixels_read++;
591 }
592 } else {
593 bits = get_bits1(&gb);
594 if (bits == 0) {
595 run_length = get_bits(&gb, 2) + 4;
596 bits = get_bits(&gb, 4);
597
598 if (non_mod == 1 && bits == 1)
599 pixels_read += run_length;
600 else {
601 if (map_table)
602 bits = map_table[bits];
603 while (run_length-- > 0 && pixels_read < dbuf_len) {
604 *destbuf++ = bits;
605 pixels_read++;
606 }
607 }
608 } else {
609 bits = get_bits(&gb, 2);
610 if (bits == 2) {
611 run_length = get_bits(&gb, 4) + 9;
612 bits = get_bits(&gb, 4);
613
614 if (non_mod == 1 && bits == 1)
615 pixels_read += run_length;
616 else {
617 if (map_table)
618 bits = map_table[bits];
619 while (run_length-- > 0 && pixels_read < dbuf_len) {
620 *destbuf++ = bits;
621 pixels_read++;
622 }
623 }
624 } else if (bits == 3) {
625 run_length = get_bits(&gb, 8) + 25;
626 bits = get_bits(&gb, 4);
627
628 if (non_mod == 1 && bits == 1)
629 pixels_read += run_length;
630 else {
631 if (map_table)
632 bits = map_table[bits];
633 while (run_length-- > 0 && pixels_read < dbuf_len) {
634 *destbuf++ = bits;
635 pixels_read++;
636 }
637 }
638 } else if (bits == 1) {
639 pixels_read += 2;
640 if (map_table)
641 bits = map_table[0];
642 else
643 bits = 0;
644 if (pixels_read <= dbuf_len) {
645 *destbuf++ = bits;
646 *destbuf++ = bits;
647 }
648 } else {
649 if (map_table)
650 bits = map_table[0];
651 else
652 bits = 0;
653 *destbuf++ = bits;
654 pixels_read ++;
655 }
656 }
657 }
658 }
659 }
660
661 if (get_bits(&gb, 8))
662 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
663
664 (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
665
666 return pixels_read;
667 }
668
669 static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
670 const uint8_t **srcbuf, int buf_size,
671 int non_mod, uint8_t *map_table)
672 {
673 const uint8_t *sbuf_end = (*srcbuf) + buf_size;
674 int bits;
675 int run_length;
676 int pixels_read = 0;
677
678 while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
679 bits = *(*srcbuf)++;
680
681 if (bits) {
682 if (non_mod != 1 || bits != 1) {
683 if (map_table)
684 *destbuf++ = map_table[bits];
685 else
686 *destbuf++ = bits;
687 }
688 pixels_read++;
689 } else {
690 bits = *(*srcbuf)++;
691 run_length = bits & 0x7f;
692 if ((bits & 0x80) == 0) {
693 if (run_length == 0) {
694 return pixels_read;
695 }
696
697 if (map_table)
698 bits = map_table[0];
699 else
700 bits = 0;
701 while (run_length-- > 0 && pixels_read < dbuf_len) {
702 *destbuf++ = bits;
703 pixels_read++;
704 }
705 } else {
706 bits = *(*srcbuf)++;
707
708 if (non_mod == 1 && bits == 1)
709 pixels_read += run_length;
710 if (map_table)
711 bits = map_table[bits];
712 else while (run_length-- > 0 && pixels_read < dbuf_len) {
713 *destbuf++ = bits;
714 pixels_read++;
715 }
716 }
717 }
718 }
719
720 if (*(*srcbuf)++)
721 av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");
722
723 return pixels_read;
724 }
725
726
727
728 static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display,
729 const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
730 {
731 DVBSubContext *ctx = avctx->priv_data;
732
733 DVBSubRegion *region = get_region(ctx, display->region_id);
734 const uint8_t *buf_end = buf + buf_size;
735 uint8_t *pbuf;
736 int x_pos, y_pos;
737 int i;
738
739 uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf};
740 uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
741 uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
742 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
743 uint8_t *map_table;
744
745 av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
746 top_bottom ? "bottom" : "top");
747
748 for (i = 0; i < buf_size; i++) {
749 if (i % 16 == 0)
750 av_dlog(avctx, "0x%8p: ", buf+i);
751
752 av_dlog(avctx, "%02x ", buf[i]);
753 if (i % 16 == 15)
754 av_dlog(avctx, "\n");
755 }
756
757 if (i % 16)
758 av_dlog(avctx, "\n");
759
760 if (region == 0)
761 return;
762
763 pbuf = region->pbuf;
764
765 x_pos = display->x_pos;
766 y_pos = display->y_pos;
767
768 if ((y_pos & 1) != top_bottom)
769 y_pos++;
770
771 while (buf < buf_end) {
772 if (x_pos > region->width || y_pos > region->height) {
773 av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
774 return;
775 }
776
777 switch (*buf++) {
778 case 0x10:
779 if (region->depth == 8)
780 map_table = map2to8;
781 else if (region->depth == 4)
782 map_table = map2to4;
783 else
784 map_table = NULL;
785
786 x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
787 region->width - x_pos, &buf, buf_end - buf,
788 non_mod, map_table);
789 break;
790 case 0x11:
791 if (region->depth < 4) {
792 av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
793 return;
794 }
795
796 if (region->depth == 8)
797 map_table = map4to8;
798 else
799 map_table = NULL;
800
801 x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
802 region->width - x_pos, &buf, buf_end - buf,
803 non_mod, map_table);
804 break;
805 case 0x12:
806 if (region->depth < 8) {
807 av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
808 return;
809 }
810
811 x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
812 region->width - x_pos, &buf, buf_end - buf,
813 non_mod, NULL);
814 break;
815
816 case 0x20:
817 map2to4[0] = (*buf) >> 4;
818 map2to4[1] = (*buf++) & 0xf;
819 map2to4[2] = (*buf) >> 4;
820 map2to4[3] = (*buf++) & 0xf;
821 break;
822 case 0x21:
823 for (i = 0; i < 4; i++)
824 map2to8[i] = *buf++;
825 break;
826 case 0x22:
827 for (i = 0; i < 16; i++)
828 map4to8[i] = *buf++;
829 break;
830
831 case 0xf0:
832 x_pos = display->x_pos;
833 y_pos += 2;
834 break;
835 default:
836 av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
837 }
838 }
839
840 }
841
842 static void dvbsub_parse_object_segment(AVCodecContext *avctx,
843 const uint8_t *buf, int buf_size)
844 {
845 DVBSubContext *ctx = avctx->priv_data;
846
847 const uint8_t *buf_end = buf + buf_size;
848 const uint8_t *block;
849 int object_id;
850 DVBSubObject *object;
851 DVBSubObjectDisplay *display;
852 int top_field_len, bottom_field_len;
853
854 int coding_method, non_modifying_color;
855
856 object_id = AV_RB16(buf);
857 buf += 2;
858
859 object = get_object(ctx, object_id);
860
861 if (!object)
862 return;
863
864 coding_method = ((*buf) >> 2) & 3;
865 non_modifying_color = ((*buf++) >> 1) & 1;
866
867 if (coding_method == 0) {
868 top_field_len = AV_RB16(buf);
869 buf += 2;
870 bottom_field_len = AV_RB16(buf);
871 buf += 2;
872
873 if (buf + top_field_len + bottom_field_len > buf_end) {
874 av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
875 return;
876 }
877
878 for (display = object->display_list; display; display = display->object_list_next) {
879 block = buf;
880
881 dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
882 non_modifying_color);
883
884 if (bottom_field_len > 0)
885 block = buf + top_field_len;
886 else
887 bottom_field_len = top_field_len;
888
889 dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
890 non_modifying_color);
891 }
892
893 /* } else if (coding_method == 1) {*/
894
895 } else {
896 av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
897 }
898
899 }
900
901 static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
902 const uint8_t *buf, int buf_size)
903 {
904 DVBSubContext *ctx = avctx->priv_data;
905
906 const uint8_t *buf_end = buf + buf_size;
907 int i, clut_id;
908 DVBSubCLUT *clut;
909 int entry_id, depth , full_range;
910 int y, cr, cb, alpha;
911 int r, g, b, r_add, g_add, b_add;
912
913 av_dlog(avctx, "DVB clut packet:\n");
914
915 for (i=0; i < buf_size; i++) {
916 av_dlog(avctx, "%02x ", buf[i]);
917 if (i % 16 == 15)
918 av_dlog(avctx, "\n");
919 }
920
921 if (i % 16)
922 av_dlog(avctx, "\n");
923
924 clut_id = *buf++;
925 buf += 1;
926
927 clut = get_clut(ctx, clut_id);
928
929 if (!clut) {
930 clut = av_malloc(sizeof(DVBSubCLUT));
931
932 memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
933
934 clut->id = clut_id;
935
936 clut->next = ctx->clut_list;
937 ctx->clut_list = clut;
938 }
939
940 while (buf + 4 < buf_end) {
941 entry_id = *buf++;
942
943 depth = (*buf) & 0xe0;
944
945 if (depth == 0) {
946 av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
947 return;
948 }
949
950 full_range = (*buf++) & 1;
951
952 if (full_range) {
953 y = *buf++;
954 cr = *buf++;
955 cb = *buf++;
956 alpha = *buf++;
957 } else {
958 y = buf[0] & 0xfc;
959 cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
960 cb = (buf[1] << 2) & 0xf0;
961 alpha = (buf[1] << 6) & 0xc0;
962
963 buf += 2;
964 }
965
966 if (y == 0)
967 alpha = 0xff;
968
969 YUV_TO_RGB1_CCIR(cb, cr);
970 YUV_TO_RGB2_CCIR(r, g, b, y);
971
972 av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
973
974 if (depth & 0x80)
975 clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
976 if (depth & 0x40)
977 clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
978 if (depth & 0x20)
979 clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
980 }
981 }
982
983
984 static void dvbsub_parse_region_segment(AVCodecContext *avctx,
985 const uint8_t *buf, int buf_size)
986 {
987 DVBSubContext *ctx = avctx->priv_data;
988
989 const uint8_t *buf_end = buf + buf_size;
990 int region_id, object_id;
991 DVBSubRegion *region;
992 DVBSubObject *object;
993 DVBSubObjectDisplay *display;
994 int fill;
995
996 if (buf_size < 10)
997 return;
998
999 region_id = *buf++;
1000
1001 region = get_region(ctx, region_id);
1002
1003 if (!region) {
1004 region = av_mallocz(sizeof(DVBSubRegion));
1005
1006 region->id = region_id;
1007
1008 region->next = ctx->region_list;
1009 ctx->region_list = region;
1010 }
1011
1012 fill = ((*buf++) >> 3) & 1;
1013
1014 region->width = AV_RB16(buf);
1015 buf += 2;
1016 region->height = AV_RB16(buf);
1017 buf += 2;
1018
1019 if (region->width * region->height != region->buf_size) {
1020 av_free(region->pbuf);
1021
1022 region->buf_size = region->width * region->height;
1023
1024 region->pbuf = av_malloc(region->buf_size);
1025
1026 fill = 1;
1027 }
1028
1029 region->depth = 1 << (((*buf++) >> 2) & 7);
1030 if(region->depth<2 || region->depth>8){
1031 av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
1032 region->depth= 4;
1033 }
1034 region->clut = *buf++;
1035
1036 if (region->depth == 8)
1037 region->bgcolor = *buf++;
1038 else {
1039 buf += 1;
1040
1041 if (region->depth == 4)
1042 region->bgcolor = (((*buf++) >> 4) & 15);
1043 else
1044 region->bgcolor = (((*buf++) >> 2) & 3);
1045 }
1046
1047 av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
1048
1049 if (fill) {
1050 memset(region->pbuf, region->bgcolor, region->buf_size);
1051 av_dlog(avctx, "Fill region (%d)\n", region->bgcolor);
1052 }
1053
1054 delete_region_display_list(ctx, region);
1055
1056 while (buf + 5 < buf_end) {
1057 object_id = AV_RB16(buf);
1058 buf += 2;
1059
1060 object = get_object(ctx, object_id);
1061
1062 if (!object) {
1063 object = av_mallocz(sizeof(DVBSubObject));
1064
1065 object->id = object_id;
1066 object->next = ctx->object_list;
1067 ctx->object_list = object;
1068 }
1069
1070 object->type = (*buf) >> 6;
1071
1072 display = av_mallocz(sizeof(DVBSubObjectDisplay));
1073
1074 display->object_id = object_id;
1075 display->region_id = region_id;
1076
1077 display->x_pos = AV_RB16(buf) & 0xfff;
1078 buf += 2;
1079 display->y_pos = AV_RB16(buf) & 0xfff;
1080 buf += 2;
1081
1082 if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
1083 display->fgcolor = *buf++;
1084 display->bgcolor = *buf++;
1085 }
1086
1087 display->region_list_next = region->display_list;
1088 region->display_list = display;
1089
1090 display->object_list_next = object->display_list;
1091 object->display_list = display;
1092 }
1093 }
1094
1095 static void dvbsub_parse_page_segment(AVCodecContext *avctx,
1096 const uint8_t *buf, int buf_size)
1097 {
1098 DVBSubContext *ctx = avctx->priv_data;
1099 DVBSubRegionDisplay *display;
1100 DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;
1101
1102 const uint8_t *buf_end = buf + buf_size;
1103 int region_id;
1104 int page_state;
1105
1106 if (buf_size < 1)
1107 return;
1108
1109 ctx->time_out = *buf++;
1110 page_state = ((*buf++) >> 2) & 3;
1111
1112 av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
1113
1114 if (page_state == 2) {
1115 delete_state(ctx);
1116 }
1117
1118 tmp_display_list = ctx->display_list;
1119 ctx->display_list = NULL;
1120 ctx->display_list_size = 0;
1121
1122 while (buf + 5 < buf_end) {
1123 region_id = *buf++;
1124 buf += 1;
1125
1126 display = tmp_display_list;
1127 tmp_ptr = &tmp_display_list;
1128
1129 while (display && display->region_id != region_id) {
1130 tmp_ptr = &display->next;
1131 display = display->next;
1132 }
1133
1134 if (!display)
1135 display = av_mallocz(sizeof(DVBSubRegionDisplay));
1136
1137 display->region_id = region_id;
1138
1139 display->x_pos = AV_RB16(buf);
1140 buf += 2;
1141 display->y_pos = AV_RB16(buf);
1142 buf += 2;
1143
1144 *tmp_ptr = display->next;
1145
1146 display->next = ctx->display_list;
1147 ctx->display_list = display;
1148 ctx->display_list_size++;
1149
1150 av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
1151 }
1152
1153 while (tmp_display_list) {
1154 display = tmp_display_list;
1155
1156 tmp_display_list = display->next;
1157
1158 av_free(display);
1159 }
1160
1161 }
1162
1163
1164 #ifdef DEBUG
1165 static void save_display_set(DVBSubContext *ctx)
1166 {
1167 DVBSubRegion *region;
1168 DVBSubRegionDisplay *display;
1169 DVBSubCLUT *clut;
1170 uint32_t *clut_table;
1171 int x_pos, y_pos, width, height;
1172 int x, y, y_off, x_off;
1173 uint32_t *pbuf;
1174 char filename[32];
1175 static int fileno_index = 0;
1176
1177 x_pos = -1;
1178 y_pos = -1;
1179 width = 0;
1180 height = 0;
1181
1182 for (display = ctx->display_list; display; display = display->next) {
1183 region = get_region(ctx, display->region_id);
1184
1185 if (x_pos == -1) {
1186 x_pos = display->x_pos;
1187 y_pos = display->y_pos;
1188 width = region->width;
1189 height = region->height;
1190 } else {
1191 if (display->x_pos < x_pos) {
1192 width += (x_pos - display->x_pos);
1193 x_pos = display->x_pos;
1194 }
1195
1196 if (display->y_pos < y_pos) {
1197 height += (y_pos - display->y_pos);
1198 y_pos = display->y_pos;
1199 }
1200
1201 if (display->x_pos + region->width > x_pos + width) {
1202 width = display->x_pos + region->width - x_pos;
1203 }
1204
1205 if (display->y_pos + region->height > y_pos + height) {
1206 height = display->y_pos + region->height - y_pos;
1207 }
1208 }
1209 }
1210
1211 if (x_pos >= 0) {
1212
1213 pbuf = av_malloc(width * height * 4);
1214
1215 for (display = ctx->display_list; display; display = display->next) {
1216 region = get_region(ctx, display->region_id);
1217
1218 x_off = display->x_pos - x_pos;
1219 y_off = display->y_pos - y_pos;
1220
1221 clut = get_clut(ctx, region->clut);
1222
1223 if (clut == 0)
1224 clut = &default_clut;
1225
1226 switch (region->depth) {
1227 case 2:
1228 clut_table = clut->clut4;
1229 break;
1230 case 8:
1231 clut_table = clut->clut256;
1232 break;
1233 case 4:
1234 default:
1235 clut_table = clut->clut16;
1236 break;
1237 }
1238
1239 for (y = 0; y < region->height; y++) {
1240 for (x = 0; x < region->width; x++) {
1241 pbuf[((y + y_off) * width) + x_off + x] =
1242 clut_table[region->pbuf[y * region->width + x]];
1243 }
1244 }
1245
1246 }
1247
1248 snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index);
1249
1250 png_save2(filename, pbuf, width, height);
1251
1252 av_free(pbuf);
1253 }
1254
1255 fileno_index++;
1256 }
1257 #endif
1258
1259 static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
1260 const uint8_t *buf,
1261 int buf_size)
1262 {
1263 DVBSubContext *ctx = avctx->priv_data;
1264 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1265 int dds_version, info_byte;
1266
1267 if (buf_size < 5)
1268 return;
1269
1270 info_byte = bytestream_get_byte(&buf);
1271 dds_version = info_byte >> 4;
1272 if (display_def && display_def->version == dds_version)
1273 return; // already have this display definition version
1274
1275 if (!display_def) {
1276 display_def = av_mallocz(sizeof(*display_def));
1277 ctx->display_definition = display_def;
1278 }
1279 if (!display_def)
1280 return;
1281
1282 display_def->version = dds_version;
1283 display_def->x = 0;
1284 display_def->y = 0;
1285 display_def->width = bytestream_get_be16(&buf) + 1;
1286 display_def->height = bytestream_get_be16(&buf) + 1;
1287
1288 if (buf_size < 13)
1289 return;
1290
1291 if (info_byte & 1<<3) { // display_window_flag
1292 display_def->x = bytestream_get_be16(&buf);
1293 display_def->y = bytestream_get_be16(&buf);
1294 display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
1295 display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
1296 }
1297 }
1298
1299 static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
1300 int buf_size, AVSubtitle *sub)
1301 {
1302 DVBSubContext *ctx = avctx->priv_data;
1303 DVBSubDisplayDefinition *display_def = ctx->display_definition;
1304
1305 DVBSubRegion *region;
1306 DVBSubRegionDisplay *display;
1307 AVSubtitleRect *rect;
1308 DVBSubCLUT *clut;
1309 uint32_t *clut_table;
1310 int i;
1311 int offset_x=0, offset_y=0;
1312
1313 sub->rects = NULL;
1314 sub->start_display_time = 0;
1315 sub->end_display_time = ctx->time_out * 1000;
1316 sub->format = 0;
1317
1318 if (display_def) {
1319 offset_x = display_def->x;
1320 offset_y = display_def->y;
1321 }
1322
1323 sub->num_rects = ctx->display_list_size;
1324
1325 if (sub->num_rects > 0){
1326 sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
1327 for(i=0; i<sub->num_rects; i++)
1328 sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
1329 }
1330
1331 i = 0;
1332
1333 for (display = ctx->display_list; display; display = display->next) {
1334 region = get_region(ctx, display->region_id);
1335 rect = sub->rects[i];
1336
1337 if (!region)
1338 continue;
1339
1340 rect->x = display->x_pos + offset_x;
1341 rect->y = display->y_pos + offset_y;
1342 rect->w = region->width;
1343 rect->h = region->height;
1344 rect->nb_colors = 16;
1345 rect->type = SUBTITLE_BITMAP;
1346 rect->pict.linesize[0] = region->width;
1347
1348 clut = get_clut(ctx, region->clut);
1349
1350 if (!clut)
1351 clut = &default_clut;
1352
1353 switch (region->depth) {
1354 case 2:
1355 clut_table = clut->clut4;
1356 break;
1357 case 8:
1358 clut_table = clut->clut256;
1359 break;
1360 case 4:
1361 default:
1362 clut_table = clut->clut16;
1363 break;
1364 }
1365
1366 rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
1367 memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t));
1368
1369 rect->pict.data[0] = av_malloc(region->buf_size);
1370 memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
1371
1372 i++;
1373 }
1374
1375 sub->num_rects = i;
1376
1377 #ifdef DEBUG
1378 save_display_set(ctx);
1379 #endif
1380
1381 return 1;
1382 }
1383
1384 static int dvbsub_decode(AVCodecContext *avctx,
1385 void *data, int *data_size,
1386 AVPacket *avpkt)
1387 {
1388 const uint8_t *buf = avpkt->data;
1389 int buf_size = avpkt->size;
1390 DVBSubContext *ctx = avctx->priv_data;
1391 AVSubtitle *sub = data;
1392 const uint8_t *p, *p_end;
1393 int segment_type;
1394 int page_id;
1395 int segment_length;
1396 int i;
1397
1398 av_dlog(avctx, "DVB sub packet:\n");
1399
1400 for (i=0; i < buf_size; i++) {
1401 av_dlog(avctx, "%02x ", buf[i]);
1402 if (i % 16 == 15)
1403 av_dlog(avctx, "\n");
1404 }
1405
1406 if (i % 16)
1407 av_dlog(avctx, "\n");
1408
1409 if (buf_size <= 6 || *buf != 0x0f) {
1410 av_dlog(avctx, "incomplete or broken packet");
1411 return -1;
1412 }
1413
1414 p = buf;
1415 p_end = buf + buf_size;
1416
1417 while (p_end - p >= 6 && *p == 0x0f) {
1418 p += 1;
1419 segment_type = *p++;
1420 page_id = AV_RB16(p);
1421 p += 2;
1422 segment_length = AV_RB16(p);
1423 p += 2;
1424
1425 if (p_end - p < segment_length) {
1426 av_dlog(avctx, "incomplete or broken packet");
1427 return -1;
1428 }
1429
1430 if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
1431 ctx->composition_id == -1 || ctx->ancillary_id == -1) {
1432 switch (segment_type) {
1433 case DVBSUB_PAGE_SEGMENT:
1434 dvbsub_parse_page_segment(avctx, p, segment_length);
1435 break;
1436 case DVBSUB_REGION_SEGMENT:
1437 dvbsub_parse_region_segment(avctx, p, segment_length);
1438 break;
1439 case DVBSUB_CLUT_SEGMENT:
1440 dvbsub_parse_clut_segment(avctx, p, segment_length);
1441 break;
1442 case DVBSUB_OBJECT_SEGMENT:
1443 dvbsub_parse_object_segment(avctx, p, segment_length);
1444 break;
1445 case DVBSUB_DISPLAYDEFINITION_SEGMENT:
1446 dvbsub_parse_display_definition_segment(avctx, p, segment_length);
1447 case DVBSUB_DISPLAY_SEGMENT:
1448 *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
1449 break;
1450 default:
1451 av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
1452 segment_type, page_id, segment_length);
1453 break;
1454 }
1455 }
1456
1457 p += segment_length;
1458 }
1459
1460 return p - buf;
1461 }
1462
1463
1464 AVCodec ff_dvbsub_decoder = {
1465 .name = "dvbsub",
1466 .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"),
1467 .type = AVMEDIA_TYPE_SUBTITLE,
1468 .id = AV_CODEC_ID_DVB_SUBTITLE,
1469 .priv_data_size = sizeof(DVBSubContext),
1470 .init = dvbsub_init_decoder,
1471 .close = dvbsub_close_decoder,
1472 .decode = dvbsub_decode,
1473 };